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Quick Search     Adv Search   2022 Vol. 32, No. 04 Published: 2022-08-10   1 The application and development trend of hot isostatic pressing in the field of metal material processing Hot! CHE Hongyan，WANG Tiejun，QIN Wei，DONG Hao，ZHANG Longge，ZHANG Yan DOI: 10.13228/j.boyuan.issn1006-6543.20210113 Metals occupy an important position in the field of materials which are regraded as the cornerstone of the development of science and technology. One specific technology—Hot Isostatic Pressing (HIP), is inevitably related to the production of advanced metal materials. In HIPing process, no liquid phase appears, and metallurgi‐ cal bonding is achieved due to atomic diffusing in solid state. According to the processing characteristics, HIP can be applied in three scenarios: densification treatment , diffusion bonding and powder metallurgy, in which the HIP near net shape (HIP-NNS) technology is deemed as the high-end form. This paper summarizes the research prog‐ ress of HIP technology, and describes the application fields of densification treatment, the state-of-the-art of diffu‐ sion bonding and the application trends of powder metallurgy products, thereby providing reference for engineering technicians who seek high-end metallic material technology. 2022 Vol. 32 (04): 1-7 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 8 A simulation study of gas flow field in electrode induction melting gas atomization Hot! ZHANG Xueliang，TAO Yu，JIA Jian，QU Jinglong DOI: 10.13228/j.boyuan.issn1006-6543.20210152 （1. High Temperature Materials Research Institute, CISRI, Beijing 100081, China； 2. GAONA Aero Material Co., Ltd., Beijing 100081, China； 2022 Vol. 32 (04): 8-16 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 17 Effect of addition of iron powder on sintering process of vanadium-nitrogen alloy Hot! LIU Yang，XU Jing，CHEN Yuqiang，LIU Xiao DOI: 10.13228/j.boyuan.issn1006-6543.20210126 In industrial production, adding iron powder can greatly improve the density of vanadium-nitrogen (VN) alloy products. In order to meet the needs of enterprises to improve production process and product quality, taking the VN alloy products produced by industrial V2O5 powder, graphite powder and iron powder raw materials in pusher kiln as the object, the existing forms of iron in VN alloy and its influence on its sintering process were studied, and the action mechanism of Fe was discussed. The results show that iron in VN alloy exists in the form of Fe phase, and irregular inclusions are distributed between VN matrix phases. In the sintering process, the Fe phase changes into liquid phase at about 1 200 ℃ and becomes a liquid diffusion channel of carbon. The carbothermal re‐ duction nitridation reaction changes from solid-solid reaction to solid-liquid reaction, resulting in rapid densifica‐ tion of alloy sintering; Adding iron powder can improve the density and nitrogen content of VN alloy products, and reduce its carbon content and oxygen content. 2022 Vol. 32 (04): 17-24 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 25 Preparation and properties of large-size ZrO2 delivery tube for vacuum induction melting gas atomization Hot! WANG Laiwen，YU Jianbin，SHUI Guoyan，GUO Xinli，WANG Gang，DU Penghui DOI: 10.13228/j.boyuan.issn1006-6543.20220024 Ceramic delivery tube was the key functional component of vacuum induction melting gas atomization method(VIGA). With the enlargement of equipment, the size of ceramic delivery tube was also gradually larger. The BN delivery tube had good thermal shock resistance, but it was prone to oxidation and erosion in practical application. It was one of the main factors affecting the production and alloy powder quality. ZrO2 had high temper‐ ature resistance, wear resistance, chemical resistance, low specific heat and thermal conductivity, so it was the ideal material to replace the BN delivery tube. The thermal shock resistance of ZrO2 became worse with its larger size and more complex structure. Large size delivery tube with complex structure and heavy wall( 20 mm thickest ) re‐ quired higher fluidity of hot injection moulding. The effects of paraffin addition amount and sintering temperature on the performance of large-size ZrO2 delivery tube were studied. On account of phase transition, the thermal shock resistance of m-ZrO 2 was poor. Stabilizers were usually introduced to make m-ZrO2 become partially stabilized ZrO 2. MgO, CaO and Y2O3 were the commonly used stabilizers. MgO stabilized ZrO2 had the best thermal shock re‐ sistance. The Large-size ZrO2 delivery tube was prepared by hot injection moulding with MgO stabilized ZrO2 and monoclinic ZrO 2 as the main materials, MgCO3 as the stabilizer, the paraffin wax addition amount of 9.5%, 10% and 10.5% respectively. After degreasing, the bodies were sintered at 1 650, 1 700 and 1 750 ℃ for 7 h, respectively. The results shows that the density and room temperature flexural strength of the samples are gradually increased with the increase of sintering temperature. The density, room temperature flexural strength and thermal expansion coefficient of the samples are decreased with the increase of paraffin wax addition amount. The density and thermal expansion coefficient of imported large-size ZrO2 delivery tube are lower than that of the experimental samples, and the thermal shock resistance at 1 100 ℃ is equivalent to that of the experimental samples sintered at 1 700 ℃ with the paraffin wax addition content of 10%. Through this study, the technical bottleneck that hot injection moulding cannot prepare thick-wall products has been broken, and the technical parameter for preparing thickwalled products by hot injection moulding is determined. The delivery tube sintered at 1 700 ℃ with the paraffin wax addition content of 10% has the best comprehensive performance and meets the requirements of one-time on-line service. Improving the cold shock resistance of delivery tube is beneficial to its reuse. 2022 Vol. 32 (04): 25-30 [Abstract] ( 4 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 31 Effect of powder shape on microscopic morphology and rheological properties of Ti-6Al-4V injection molding feedstock Hot! CUI Shan，ZHANG Enyao，HU Ke，ZHOU Peng，ZHOU Chao DOI: 10.13228/j.boyuan.issn1006-6543.20220008 Microscopic morphology and rheological properties of Ti-6Al-4V injection molding feedstock with dif‐ ferent powder shapes were studied by particle size analysis, microscopic morphology analysis and rheological prop‐ erty analysis. Powder loading test results show that the critical powder loading of S-Ti powder feedstock and HDHTi powder feedstock are 67% and 52% respectively. Viscosity(η) and flow behavior index(n) values of S-Ti powder feedstock are lower than those of HDH-Ti powder feedstock at optimum powder loading, which indicate that the STi powder feedstock has better fluidity. Particle shape analysis result shows that reducing specific surface area of powder is helpful to the increasing of the critical loading of Ti-6Al-4V powder injection molding feedstock. In addi‐ tion, theoretical research and energy spectrum analysis point out that the fluidity of HDH-Ti powder feedstock is decided by the distribution of smaller particle. 2022 Vol. 32 (04): 31-37 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 38 Fabrication and properties of powder metallurgy friction material for ZD6 switch machine Hot! DU Jun，FENG Chiyuan，CHEN Shaohua，MEI Jigang，ZHU Jinming，YIN Cailiu DOI: 10.13228/j.boyuan.issn1006-6543.20220063 The mechanical properties, friction coefficient, stability of friction coefficient and wear rate of friction materials of ZD6 switch machine determine the stability of friction current, which ultimately affect the normal operation of track system. In order to meet the requirements of stable and reliable output force of switch ma‐ chine, selecting friction materials suitable for the working conditions of switch machine is of great significance. Aiming at the problems of low friction stability and high wear rate of ZD6 switch machine friction belt in low temperature and high humidity environment, the friction materials for ZD6 switch machine were prepared by powder metallurgy technology. On the basis of mature formula, the effects of different kinds of friction perfor‐ mance regulators on the comprehensive mechanical properties and friction and wear properties of the materials were studied and compared, and the impact section morphology and friction surface morphology of the samples were observed by scanning electron microscope（SEM）. The wear mechanism of friction materials for ZD6 switch machine with five different kinds of friction performance regulators was compared and analyzed. The re‐ sults show that the wear mechanism of ZD6 switch machine friction material with artificial graphite as friction property regulator is abrasive wear, and its comprehensive mechanical properties and friction and wear proper‐ ties are the best. It is the best choice for ZD6 switch machine powder metallurgy friction belt. 2022 Vol. 32 (04): 38-45 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 46 Influence of sintering temperature on microstructure and properties of 304 stainless steel PM sintered body Hot! LIU Xinyu，WANG Tianguo DOI: 10.13228/j.boyuan.issn1006-6543.20200256 304 austenitic P/M stainless steel was prepared by vacuum sintering. The effects of different sintering temperatures on the microstructure, density, tensile strength and corrosion resistance of P/M 304 stainless steel were studied. The results show that with the increase of sintering temperature from 1 210 ℃ to 1 300 ℃, the number of pores and the size of pores in the sintered body of 304 stainless steel decrease significantly. When the sintering temperature increases to 1 360 ℃, the grains in the sintered body gradually grow and coarsen, and the size of pores increases. With the increase of sintering temperature, the density, hardness, tensile strength and cor‐ rosion resistance of the sintered body first increased and then decreased. The optimum sintering temperature is 1 300 ℃. At this time, the sintered sample has the maximum density, hardness and tensile strength, which are 7.23 g/cm3, HRB68.88 and 344.19 MPa respectively. The self-corrosion current of the sample is the smallest and has the best corrosion resistance. 2022 Vol. 32 (04): 46-50 [Abstract] ( 5 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 51 Effects of stabilizers on the microstructure and conductivity of the 40Mo-ZrO2 cermet Hot! LI Jianchao，QI Suci，TANG Lei，XU Jifang DOI: 10.13228/j.boyuan.issn1006-6543.20200219 In order to reduce the influence of the reversible phase transition of zirconia on the structure and perfor‐ mance of 40Mo-ZrO 2 cermet, 3%Y2O3 and 12%CeO2 stabilizers were added to the ZrO2 ceramic matrix. The 40MoZrO 2 cermet samples were prepared by powder metallurgy, and the effect of stabilizers on the microstructure and electrical conductivity of cermet was studied. The results indicate that the addition of Y2O3 and CeO2 stabilizers to the ceramic matrix lead to the appearance of amount of tetragonal zirconia phase, the size of the sintered particles increases, and the metal phase network structure is more obvious. And also lead the density of cement increase, the porosity is reduced slightly and the electrical conductivity decreases. With the increase of temperature, electrical conductivity of cermet decreases, and the range of change of conductivity also gradually decreases. The electrical conductivity of cermet mainly presents the electronic conduction mechanism of the metal phase 2022 Vol. 32 (04): 51-56 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 57 Preparation and electrochemical performance of Ni25Co base CP-MOF electrode for contactor Hot! WANG Zhongli，JU Aiyun，ZHANG Shuai，LI Pen DOI: 10.13228/j.boyuan.issn1006-6543.20200210 A new type of Ni based MOFs with CP as the ligand, Ni25Co-MOF was designed and synthesized by the solvothermal method. The microstructure and surface morphology of Ni25Co-MOF were studied by XRD, FTIR, TGA, N2 adsorption and desorption and SEM. The electrochemical performance of Ni25Co-MOF electrode material was tested. The results show that the Ni 25Co-MOF product with good crystal structure has been prepared, which can stably exist in the air at 400 °C. The nitrogen adsorption and desorption isotherm formed is an obvious IV iso‐ therm and the hysteresis type is H3. As the porosity increases, MOFs gain higher capacitance. A continuous struc‐ ture is formed in Ni 25Co-MOF, and a large cavity composed of structural entities is formed in the surface region. Af‐ ter 2 000 charge-discharge treatments, the specific capacitance of Ni25Co-MOF electrode is reduced to 86% of the initial value, showing excellent cycling stability. In the low frequency band of Nyquist curve, a straight line with a high slope is formed, and the angle between the curve and the abscissa is more than 45°, showing a strong capaci‐ tive ion migration performance. 2022 Vol. 32 (04): 57-61 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 62 Research progress of red mud coal-based reduction technology to produce iron powder Hot! XU Wenzhen，LI Canhua，ZHA Yuhong，ZHANG Long，YU Qiaodi，WANG Kaiju DOI: 10.13228/j.boyuan.issn1006-6543.20210037 Red mud is a solid waste residue produced in the process of alumina smelting. With the accumulation of a large amount of red mud, it has caused great harm to the environment. At the same time, red mud has high poten‐ tial utilization value. Based on this background, the basic properties of red mud were introduced, the market of product reduced iron powder was briefly analyzed, and the research status of red mud coal-based direct reduction technology for producing iron powder was expounded in detail. These techniques include rotary kiln coal-based di‐ rect reduction technology, rotary hearth furnace coal-based direct reduction technology, tunnel kiln coal-based di‐ rect reduction technology and shaft furnace coal-based direct reduction technology. The advantages and disadvan‐ tages of the above technologies in the field of iron powder production by red mud reduction and the factors that need to be considered when choosing a suitable process are summarized, providing a reference for the subsequent research on red mud production iron powder technology. 2022 Vol. 32 (04): 62-66 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 67 Preparation technology and development direction of powder high-speed steel Hot! QIN Qian，YANG Fang，CHEN Cunguang，HAO Junjie，GUO Zhimeng DOI: 10.13228/j.boyuan.issn1006-6543.20210033 The structure and properties required for high-speed steel can be well matched with intrinsic advantages of powder metallurgy, which makes the proportion of powder metallurgy high-speed steel (PM HSS) output steadi‐ ly increase and PM HSS gradually occupy the high-end market of high-speed steel. This paper focused on the de‐ velopment process of three generation of PM HSS raw material powder, and analyzed the research status of main preparation technology of powder metallurgy high-speed steel. The comparation between advantages and disadvan‐ tages of these technologies was studied in order to select the appropriate powder metallurgy process according to actual needs. At the same time, the relevant properties of various types of powder metallurgy high-speed steel sam‐ ples were summarized, and the development strategy direction of high-performance powder metallurgy high-speed steel was pointed out. 2022 Vol. 32 (04): 67-75 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 76 Research progress and status of shielding materials for nuclear Hot! PAN Xiaolong，ZHANG Siyu，ZHENG Fukai，LIU Lu DOI: 10.13228/j.boyuan.issn1006-6543.20210161 The development and utilization of nuclear shielded materials has been going on for more than 80 years. Based on the demand for nuclear shielding materials, the research and application status of three commonly nuclear shielding materials was introduced, including boron-containing stainless steel, resin matrix composites and alumi‐ num matrix composites. The characteristics, the advantages and disadvantages of their application were evaluated respectively. On this basis, it is pointed out that with structural and functional properties combined aluminum ma‐ trix composite shielding materials containing boron and tungsten elements are the development trend of nuclear shielding materials. It can be predicted that the boron, tungsten and aluminum composite shielding materials will occupy a place in the composite shielding market in the future. 2022 Vol. 32 (04): 76-84 [Abstract] ( 6 ) HTML (1 KB)  PDF  (0 KB)  ( 4 ) 85 Research progress of solar steam generators and carbon-based light-to-heat conversion materials Hot! YANG Xiaolin，MA Libo DOI: 10.13228/j.boyuan.issn1006-6543.20200119 The consumption of energy has always been a problem that puzzles people. About 80% of the energy is non-renewable energy, and among which, fossil fuels play a leading role. Since the industrial revolution, after years of exploitation, fossil fuels have become less and less. The development of clean energy has received extensive attention. The sun has become an important energy supply center, for which various types of light-toheat conversion materials have been gradually developed. Among these materials, carbon-based materials are widely used in solar light-to-heat converters due to their own many advantages such as cheap materials, high light absorption performance, and thermal stability. So, this paper focuses on the application research and devel‐ opment of carbon-based materials as solar light-to-heat conversion materials. 2022 Vol. 32 (04): 85-88 [Abstract] ( 4 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 89 Research on production line in a powder metallurgy workshop based on eM-Plant and factory layout optimization Hot! GAO Ze DOI: 10.13228/j.boyuan.issn1006-6543.20210103 The production site of the automobile shock absorber compression seat body of a powder metallurgy en‐ terprise was selected as the observation and analysis point. This layout was sufficiently investigated in the work‐ shop production line, and the most of information such as working time, human-machine condition of equipment together with other things was accurately acquired in the process of production, and the thinking of lean manage‐ ment was adopted to analyze and solve three problems including bottleneck process, incongruity of human-ma‐ chine collaboration and logistics lag of the production line. At the same time, the simulation software was used to compare and verify the effectiveness of each process before and after the workshop layout improvement, and a set of solutions suitable for the layout reconstruction of the workshop was proposed. First of all, the total consumption of the average day was taken as the transmission amount of the whole production line, and the time data of each process was recorded. Additionally, the bottleneck process was decomposed and reassembled, and the process time histogram was drawn. The eM-Plant software was used to simulate and verify the production line before and after improvement. The results show that the balance rate of line is greatly improved by the integration of batching and mixing processes as well as the reorganization of finishing and cleaning processes. Meanwhile, human-machine operation analysis is carried out on the main processes of the workshop and its date diagram is drawn and the ideal configuration of human-machine is calculated to simulate the production line when one person with three machines on the working. The results show that the human-machine utilization rate can be improved by one worker taking in‐ to account the operation of three forming equipment. Finally, the systematic layout planning(SLP) is applied to study logistics strength of factory production, and a reasonable scheme that could decrease logistics strength is put forward . 2022 Vol. 32 (04): 89-100 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 101 Study on the suitability between selective laser melting 3D printing parameters and Mo-14Re alloys powder Hot! YANG Huaichao，CHEN Fuge，QIU Xi，LI Hengming，YUE Enlai，XIONG Ning DOI: 10.13228/j.boyuan.issn1006-6543.20220041 MoRe14 alloy parts were prepared by selective laser melting 3D printing technology. The effects of la‐ ser scanning speed and laser scanning power on the microstructure and internal defects of MoRe14 alloy samples were studied. The results show that there are obvious cracks and holes in the MoRe14 alloy samples prepared by la‐ ser selective melting 3D printing technology. With the increasing of laser power or decreasing of laser scanning speed, the laser energy density increases, the fusion between powder particles improves, the internal pores of the samples are reduced and the density of the samples is improved, but there are pores and cracks in the samples.The spherical MoRe14 alloy powder prepared by coating method has the highest density when the laser power is 180 W, the scanning speed is 900 mm/s and the scanning spacing is 0.07 mm, the density is 10.6 g/cm3 and the relative den‐ sity is 96.4%. 2022 Vol. 32 (04): 101-105 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 106 Effect of Ni/Cu ratio on property and microstructure of WNiCu alloy Hot! WANG Ling，QIN Yingnan，SHAN Dongdong，Lü Sijian, XIONG Ning DOI: 10.13228/j.boyuan.issn1006-6543.20220014 In order to study the adjustability of thermal expansion coefficient, permeability and strength of materi‐ als for gyro rotor, tungsten alloy 95WNiCu has been selected as research object. A series of experiments were car‐ ried out on properties and microstructure of 95WNiCu with different Ni/Cu ratios. The results show that the me‐ chanical property of material deteriorates with the decreasing of Ni/Cu ratio, and when the Ni/Cu ratio is below 1, material tensile strength is extremely low, elongation almost disappears. At the same time, the linear expansion co‐ efficients and mass susceptibilities gradually reduce, microstructures have no obvious difference, but fractures ex‐ hibit less bonding phase. When the Ni/Cu ratio is less than 1, bonding phase tend to disappeared and fracture mode occupies by low-strength W-W interface separation. 2022 Vol. 32 (04): 106-109 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 110 Effect of Ni/Cu ratio on the properties and thermal expansion coefficient of 65WNiCu alloy Hot! QIN Yingnan，WANG Ling，SHAN Dongdong，XIONG Ning DOI: 10.13228/j.boyuan.issn1006-6543.20220039 65WNiCu alloy was selected as the research object. Five different compositions of tungsten nickelcopper alloys with different Ni-Cu ratio were prepared by powder metallurgy. The effects of Ni-Cu ratios on mechanical properties and linear expansion coefficient of 65WNiCu alloy were studied. The results show that the Ni-Cu ratio affects the sintering temperature of the alloys. With the increase of Ni-Cu ratio, the mechanical proper‐ ties of the five alloys decreases. The copper content affects the linear expansion coefficient of 65WNiCu alloy. When the Ni-Cu ratio decreses, the copper content increases and the linear expansion coefficient increases slightly 2022 Vol. 32 (04): 110-112 [Abstract] ( 5 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 113 Effects of rolling deformation on microstructure and physical properties of Mo-30Cu rolled plate Hot! SONG Peng，LI Da，XIONG Ning，ZHANG Baohong，YAO Huilong，HAN Ruirui DOI: 10.13228/j.boyuan.issn1006-6543.20220042 Mo-30cu alloy was prepared by powder metallurgy infiltration method，then warm rolled with different deformation ratio at 850 ℃ to obtain Mo-30Cu plate. The microstructure of rolled Mo-30Cu plate was observed by metallurgical microscope. The density, Vickers hardness and tensile strength were measured to investigate the influ‐ ence of different deformation ratio on physical properties of Mo-30Cu alloy. The electrical conductivity was also measured. The result shows that the tensile strength and the Vickers hardness have increased by 71.8% and 55.7% respectively, the relative density and electrical conductivity have increased and the elongation has decreased to 2.7% when the rolling deformation ratio is over 80%. 2022 Vol. 32 (04): 113-116 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 117 Effect of powder on uniformity of molybdenum copper alloy with high copper content Hot! HAN Ruirui，LI Da，LIANG Lihong，YANG Yujuan，YANG Yunan，ZHANG Junmei DOI: 10.13228/j.boyuan.issn1006-6543.20220052 The effect of powder on the uniformity of molybdenum copper alloy with high copper content was studied from the perspective of powder selection. Comparing the parameters of the selected powder, including particle size, particle size distribution and micro morphology. The uniformity of molybdenum copper alloys pre‐ pared by different powders under the same process is compared, including ultrasonic flaw detection results, cop‐ per content and metallographic structure. The effect of powder on the uniformity of molybdenum copper alloy with high copper content is analyzed. The results show that when preparing molybdenum copper alloy with high copper content by infiltration method, copper powder needs to be added during mixing in order to fully infiltrate without pores and ensure the uniformity of composition; The agglomeration of powder has a great influence on the microstructure uniformity. The agglomeration of molybdenum powder is easy to cause the enrichment of mo‐ lybdenum particles, and the agglomeration of copper powder is easy to cause the enrichment of copper, which affects the microstructure uniformity of molybdenum copper alloy with high copper content. 2022 Vol. 32 (04): 117-121 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 122 Effect of YSZ layer porosity on thermal shock life of GYYSZ/YSZ thermal barrier coatings Hot! LIU Xinyu，ZHOU Wuping，ZHANG Baohong，XIONG Ning，DU Zhong DOI: 10.13228/j.boyuan.issn1006-6543.20220034 Thermal barrier coating is an effective thermal protection measure for aerospace titanium alloy parts. As the increase of service temperature in aerospace, the traditional 6%-8% Y2O3 stabilized ZrO2 ( 8YSZ ) thermal barri‐ er coating materials could not meet the thermal insulation and service life requirements of aerospace structural ma‐ terials. It is necessary to develop a new thermal barrier coating with excellent thermal cycling performance at high‐ er temperature. Three different structures of TBCs: A, B, and C were prepared on TA15 by plasma spraying, and the microstructure, microhardness and thermal insulation of the coatings were characterized. Through the thermal shock test at 1 200 ℃, the influence of the YSZ porosity of the transition layer on its thermal shock life perfor‐ mance was studied, and the failure mechanism of the coating was discussed. The experimental results show that the thermal insulation effect of coating A is 1.2 times that of coating B and 1.1 times that of coating C at 1 200 ℃ due to the high porosity and the doping of Gd and Yb rare earth elements. The transition layer 8YSZ coating has porosi‐ ty. The increase of the thermal insulation rate will improve the overall thermal insulation effect of TBCs to a certain extent. The thermal shock life of coating C at 1 200 °C is 1.8 times that of coating A and 2.7 times that of coating B, respectively. The fracture toughness and tensile strength of high-porosity GYYSZ coatings are low, and the intro‐ duction of YSZ transition layers can significantly improve the overall mechanical properties of TBCs.The increase in porosity of the transition layer 8YSZ will improve the overall thermal insulation effect of TBCs to a certain extent.The design of LP-YSZ in coating C enhances the strength and toughness at the interface, and the increase in the porosity of the transition layer YSZ increases the ability of TBCs to resist deformation and delays the connec‐ tion of vertical and transverse cracks in the coating. 2022 Vol. 32 (04): 122-130 [Abstract] ( 5 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 131 Research progress of oxide-enhanced molybdenum alloys Hot! REN Xueting，WANG Guangda，XIONG Ning，ZHOU Wuping DOI: 10.13228/j.boyuan.issn1006-6543.20220035 The molybdenum alloy has more stable micro-structure, low toughness-brittle transition temperature, and the high temperature performance stability have been widely concerned by scholars at home and abroad. The improvement method and mechanism of oxide on molybdenum alloy are summarized. By The effects of doping of the second phase on the particle scale, the oxide and the content of the re-crystallization temperature and plasticity on the room temperature and high temperature mechanical properties of molybdenum alloy are concluded. The de‐ velopment of a new molybdenum oxide alloy produced by the combination of theoretical research and process opti‐ mization is prospected. 2022 Vol. 32 (04): 131-138 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 139 The research progress in preparation of tungsten-rhenium alloy powders Hot! DONG Di，ZHANG Yingying，CHEN Fuge，XIONG Ning，ZHANG Baohong DOI: 10.13228/j.boyuan.issn1006-6543.20210080 Tungsten-Rhenium(W-Re) alloy products with excellent performances are widely used in the fields of aerospace, high temperature measurement, nuclear fusion, electronics and other fields. The preparation of W-Re alloy powders is the key step of its alloy. The preparation methods of W-Re alloy powders in detail are introduced, and the characteristics of solid-solid mixing method, solid-liquid mixing method, solid-solid high-energy ball mill‐ ing method and liquid-liquid mixing method are summarized. And the development and application of W-Re alloy are briefly described. 2022 Vol. 32 (04): 139-145 [Abstract] ( 7 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 146 Analysis of abnormal surface color of tungsten infiltrated copper throat lining Hot! LIN Bingtao，WANG Xiangyu，ZHOU Zixiang，GUO Yingli，TANG Liangliang，SUN Xiaoxia DOI: 10.13228/j.boyuan.issn1006-6543.20220048 Aiming at the phenomenon of abnormal color on the surface of throat lining products processed by W-7Cu infiltrated with tungsten and copper, two samples of raw material bar residue and throat lining with abnor‐ mal color were selected, and the physical properties, nondestructive testing, metallographic structure, mechanical properties and micro-morphology of the samples were compared and analyzed. The results show that there is no obvious or essential abnormality between them, which excludes the possibility of color abnormality caused by materials. Processing is also an important factor affecting the product structure and performance. Therefore, the process parameters of rotating speed of 700~800 r/min, front angle of cutting tool of 0°~6 °and back angle of 0°~8° are redesigned. The overall color of the processed new product is bright and there is no abnormality, which pro‐ vides corresponding reference for the subsequent preparation and quality control of tungsten-infiltrated copper throat liner. 2022 Vol. 32 (04): 146-150 [Abstract] ( 4 ) HTML (1 KB)  PDF  (0 KB)  ( 2 )

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