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Quick Search     Adv Search   2023 Vol. 33, No. 02 Published: 2023-04-10   1 Development status and suggestion of iron powder Hot! YUAN Yong，ZHANG Dejin，YIN Moyang，LI Songlin DOI: 10.13228/j.boyuan.issn1006-6543.20230002 The development general situation and analysis of iron powder and copper powder trade in China and abroad are presented. The application of steel powder in powder metallurgy industry is emphatically analyzed. Some suggestions for further development are put forward. 2023 Vol. 33 (02): 1-4 [Abstract] ( 5 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 5 Experimental study on the preparation of copper/tin composite spherical powder by spray drying-vacuum sintering process Hot! ZHAO Xingke，ZHANG Peng，ZHAO Zenglei DOI: 10.13228/j.boyuan.issn1006-6543.20220093 Bronze is one of the earliest metal materials used by mankind, and it is still widely used today. Metal ad‐ ditive manufacturing technology breaks through the limitations of traditional processing on the structure of bronze parts, and adds vitality to the application of this material. However, due to the high reflectivity of copper alloys to laser light, laser additive manufacturing is difficult, and copper/tin composite spherical powder is an important way to solve this problem. To this end, the experimental study on the preparation of copper/tin composite spherical pow‐ der by spray drying-sintering process was carried out. On the basis of the pre-test, an orthogonal test scheme was designed to systematically study the influence of the binder, the solid content of the slurry, the atomization pressure and the atomization temperature on the properties of the powder. The copper/tin composite spherical powder pre‐ pared by optimized process parameters has a particle size of 10-40 μm, of which D50 is 25 μm, D90 is 31.2 μm, and the powder particles are spherical. After vacuum sintering at 300 °C, the composite powder is mainly composed of copper and tin raw material particles, and a small amount of Cu6Sn5 and Cu3Sn intermetallic compounds are formed between the copper and tin raw material particles. The sintered copper/tin composite powder has better resistance to crushing strength. 2023 Vol. 33 (02): 5-11 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 12 Study on the properties of manganese trioxide prepared by different PH regulators Hot! FU Dejin，WANG Jiawei，WANG Haifeng，GOU Bibo，LI Mingdong DOI: 10.13228/j.boyuan.issn1006-6543.20220028 Manganese trioxide was prepared with manganese sulfate as raw material and oxygen as oxidant. The effects of different PH regulators（sodium hydroxide, ammonia and compound additives）on the phase composi‐ tion, microstructure and specific surface area of the product were studied. The results show that sodium impurity （Na 2Mn3O7）and manganese ammonia complex （[ NH4）Mn8O16] are introduced into the preparation of Mn3O4 with sodium hydroxide and ammonia as PH regulator, respectively. The content of manganese was low and the purity of the product was poor. Manganese trioxide prepared with compound additives as PH regulator has good crystallini‐ ty, no other peaks are generated and no introduction of other impurity ions. Micromorphology is spherical particles, particle size is about 120 nm, pore is small, specific surface area is 10.15 m2/g, hysteresis loop type is H3, pore structure is rich. 2023 Vol. 33 (02): 12-16 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 17 Effect of contact pressure on tribological properties of powder metallurgy brake materials under dry and wet conditions Hot! XIAO Yelong，CHEN Sheng，SHEN Mingxue，YAO Pingping，XIE Xuzhou， HUA Licheng DOI: 10.13228/j.boyuan.issn1006-6543.20220062 A copper matrix composite（Cu-MMC for short）for brake pads used to high-speed trains was made by powder metallurgy technology. The effect of contact pressure on tribological properties of Cu-MMC under wet and dry conditions was studied, and the wear laws of Cu-MMC and its dual material（namely cast steel）were investi‐ gated. The results indicate that the frictional stabilities increases at first and then decrease, average coefficients of friction decrease continuously, the wear rate of Cu-MMC increases significantly at first and then decreases slightly, and the wear rate of cast steel increases rapidly at first and then increases gradually with increasing contact pres‐ sure under dry and wet conditions. The delamination of Cu-MMC under low contact pressure and abrasive wear of Cu-MMC under high contact pressure are obviously alleviated in wet environment, resulting in low friction coeffi‐ cient and wear rate. 2023 Vol. 33 (02): 17-23 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 4 ) 24 Study on the microstructure and high-temperature oxidation resistance of bentonite modified MoSi2-based composite coatings Hot! ZHU Lu，YIN Jinnan，FENG Peizhong DOI: 10.13228/j.boyuan.issn1006-6543.20220050 The microstructural evolution and high-temperature oxidation behavior of bentonite modified MoSi2 composite coating prepared by spark plasma sintering were studied. The results show that the composite coating is mainly composed of MoSi2 phase and a small amount of Mo5Si3 phase, and the addition of bentonite reduces the CTE mismatch between the coating and substrate, thus the composite coating presents a crack-free morphology. During oxidation at 1 500 ℃, the composite coating maintains slow mass gain since a dense and complete layer of SiO 2 forms on the surface during the oxidation process, which inhibits the high-temperature diffusion of oxygen and effectively avoids the further oxidation inside the coating. Compared with single MoSi2 coating, the oxide scale of the bentonite modified composite coating is thinner with a crack-free morphology, therefore showing relatively better high-temperature oxidation resistance 2023 Vol. 33 (02): 24-28 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 29 Analysis of electro-separation of inclusions in Ni-based superalloy powder Hot! ZHANG Linjia，SONG Jiaming，WANG Zeyu，QU Zonghong，LAI Yunjin DOI: 10.13228/j.boyuan.issn1006-6543.20220148 In order to improve the electrostatic separation efficiency of inclusions in Ni-based superalloy，mixed powder was prepared by adding 53~150 μm size Al2O3 particles into the same range of superalloy powders. Such mixed powders was treated with electrostatic separation method and the result was observed under stereoscope. The effects of corona voltage（U），rotation speed（n）and electrode distance（S）on the removal inclusions were studied. The results show that the removing effect increases with the increase of corona voltage and the decrease of distance between electrode and roller. In the above experiment conditions，the best operation parameters are fol‐ lows: electrode voltage is 30 kV，rotation rate of the roller is 70 r/min. 2023 Vol. 33 (02): 29-32 [Abstract] ( 4 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 33 Effect of powder feeding rate on microstructure and wear resistance in laser clad‐ ding of Ni3Al based alloy Hot! XING Deyuan，HAN Wei，Karin Gong，LI Changhai，ZHAO Lin，TIAN Zhiling DOI: 10.13228/j.boyuan.issn1006-6543.20220236 Laser cladding was carried out to prepare Ni3Al based alloy coatings on 45 steel. Microstructure and wear resistance of the cladding materials was investigated using scanning electron microscopy, X-ray diffraction and wear tribometer. The results indicate that the microstructure of the Ni 3Al based cladding materials contains mainly Ni3Al and in situ-formed M7C3, and coarse Cr3C2 occurs in the cladding materials at the powder feeding rate of 1.45 kg/h. The wear resistance of the Ni3Al based cladding materials increases significantly with an increase in the powder feeding rate, which is much higher than that of the vermicular graphite cast iron. At the powder feeding rate of 1.16 kg/h, the specific wear rate of the cladding materials is 0.74×10-5 mm3/N?m, and that of the counterpart is also small, which is respectively about 19.6% and 67.7% of the vermicular graphite cast iron and its counterpart. 2023 Vol. 33 (02): 33-37 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 38 Effect of arc current in arc ion plating on high temperature oxidation resistance of chromium coated zirconium alloy Hot! REN Zhenghao，CHEN Haiqiao，YANG Chen，HUANG Jinghao，XIAO Weiwei DOI: 10.13228/j.boyuan.issn1006-6543.20220205 Chromium coatings with different arc currents were prepared on the surface of zirconium alloy by arc ion plating technology. The effect of arc currents on the oxidation resistance of zirconium alloy at high temperature was studied. The microstructure and phase composition of the coating were characterized by scanning electron mi‐ croscopy（SEM）and X-ray diffractometry（XRD）, and the effect of arc current on the oxidation resistance of Cr coated zirconium alloy at 1 200 ℃was analyzed. The results show that higher arc current can obtain thicker Cr coating per unit time. When the arc current is 80 A, the coating surface is the smoothest and the film-base binding performance is the best. After oxidation at high temperature, Cr coating mainly consists of Cr2O3, Cr and Cr-Zr. When the arc current is 80 A, the Cr coating on Zr matrix has the best protection performance. 2023 Vol. 33 (02): 38-44 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 45 Effect of high oxy-fuel velocity spraying on the mechanical properties of substrate materials Hot! PAN Qingchuan，TANG Yong，QI Qingli，Lü Neng DOI: 10.13228/j.boyuan.issn1006-6543.20220092 The high velocity oxy-fuel spraying（HVOF）technology was adopted to deposited coating on ironbased substrate using magnetostrictive materials as raw material. The effects of spraying process on the substrate material of 316L stainless steel and Q345 steel was investigated, and the mechanical properties and stress changes of the substrate material after spraying and sandblasting process were analyzed by tensile test and ultrasonic stress measurement method. The results indicate that the tensile strength and elastic modulus of the substrate slightly in‐ crease due to the processing hardening and thermal effects of spraying process on the substrate, the corresponding maximum tensile strength of 316L and Q345 steel is about 350 MPa and 450 MPa, respectively. The surface residu‐ al stress of the substrate is slightly increased, and the maximum change in residual stress for the two substrate mate‐ rials under 180 MPa tensile load is 24 MPa and 30 MPa respectively. The study of the effect of the spray treatment on the mechanical properties and stress state of the substrate material can provide data to support the subsequent ap‐ plication of magnetostrictive coating guided wave. 2023 Vol. 33 (02): 45-50 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 51 The fractal-based conductivity model of binary composite and its application in Mo-based cermet Hot! QI Suci，LI Jianchao，XU Jifang DOI: 10.13228/j.boyuan.issn1006-6543.20210007 The electrical conductivity of binary composite is closely related to the microstructure, and its morpho‐ logical distribution of composition phase have fractal characteristic. Based on fractal theory and general effective medium（GEM）equations, the conductivity model of binary composite was established, and the relationship be‐ tween the conductivity of composite and conductivity of component phase and fractal dimensions was determined. And the model was applied to the calculation of the conductivity of three molybdenum-based cermet: Mo-ZrO2, Mo-SiO 2 and Mo-Al2O3 system. The results show that the critical exponent t in the GEM equation has a certain functional relationship with the fractal dimension and tortuosity fractal dimension of the highly conductive phase. The fractal dimension D f gradually increases with the increasing of the volume fraction, and the tortuosity fractal dimension D T gradually decreases with the increasing of the volume fraction. The calculated results of the conduc‐ tivity model for the three Mo-based cermet are in good agreement with the experimental results. 2023 Vol. 33 (02): 51-56 [Abstract] ( 5 ) HTML (1 KB)  PDF  (0 KB)  ( 5 ) 57 Effect of cryogenic treatment and tempering times on microstructure and properties of M390 powder steel for chopping knives and scissors Hot! LIU Wenbin，WU Wanqiu，HUANG Liwan，LIN Yizhen，LI Ming，LI Aina DOI: 10.13228/j.boyuan.issn1006-6543.20210059 The effect of heat treatment on microstructure and mechanical properties of M390 powder stainless steel was studied by quenching, cryogenic treatment and low temperature tempering. The results show that cryogenic treatment reduces the amount of residual austenite in the alloy, and greatly increases the hardness and flexural strength of the alloy. After quenched at 1 180 ℃, with the increase of tempering times, the total number of car‐ bides per unit area and average particle size increase, and the hardness decreases. The hardness reaches 61.1 HRC after the first tempering. After quenched at 1 130 ℃, with the increase of tempering times, the total number of parti‐ cles increases, the average particle size and hardness decrease, and the hardness reaches 60.0 HRC after the first tempering. Quenching temperature and times of tempering have little effect on the bending strength, which is at the level of 4 000 MPa. 2023 Vol. 33 (02): 57-64 [Abstract] ( 4 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 65 Study on wet double-layer coating of cathode material precursor Hot! LIU Fei，YANG Yongsheng，LIU Jiying，MI Xixue，SUN Lei，WANG Yaoxi DOI: 10.13228/j.boyuan.issn1006-6543.20220086 Nickel-cobalt-manganese ternary materials have become the best choice of lithium cathode materials for 3C, power tool and selectric vehicles due to its high capacity and high density. In order to avoid side reaction between electrolyte and cathode materials and enhance the conductivity of cathode material, it is particularly impor‐ tant to modify the cathode material. In this paper, Al（2 SO4）3 and CoSO4 were used as coating raw materials. NaOH was used as precipitator. The surface of the precursor was coated with a layer of aluminum hydroxide and cobalt hydroxide by wet coating, and then oxidized to obtain AlOOH and CoOOH. The materials were characterized by LS-POP9, BET, TD, SEM, XRD and electrochemical test. The results show that the sintered cathode material has good capacity retention and cycle performance. In the test for 0.2C（3.0-4.3 V）, the specific capacity reaches 175 mAh/g, the initial charge-discharge efficiency, and it is excellent with 100% capacity retention rate after 50 cycles. It can be seen that the double-layer composite coating method provides a way to improve the performance of lithium anode materials. 2023 Vol. 33 (02): 65-68 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 69 Effects of Zr on the equilibrium phases and γ′/γ lattice misfit degree of nickel-based PM superalloy FGH4107 Hot! JIA Jian，ZHANG Yiwen，LI Xinyu，ZHANG Haopeng，HOU Qiong，YAN Ting DOI: 10.13228/j.boyuan.issn1006-6543.20220135 Nickel-based powder metallurgy（PM）superalloy FGH4107 with five varied Zr contents were prepared by the high-throughput preparation, including vacuum induction melting（VIM）, electrode induction-melting gas atomization（EIGA）, and hot isostatic pressing（as-HIPed）processes. The effects of Zr content（mass fraction 0~ 0.50%）on the equilibrium phases thermodynamics, kinetic behavior and γ/γ′ lattice misfit degree were studied by the calculation and simulation of JMatPro 6.5 software, combined with differential scanning calorimetry（DSC） and X-ray diffraction（XRD）. The results show that in the range of 600-1 400 ℃, the Zr content has little effect on the types of equilibrium phases, which are mainly composed of L, γ, MC, MB2, γ′, M3B2, M23C6, μ and σ phases, Zr atoms enter γ, γ′, MC and Ni7Zr2 phase in turn. With the increasing of Zr content from 0 to 0.50%, the initial melting temperature is greatly reduced but the final melting temperature is slightly decreased, and the temperature range of the solid-liquid two-phase region is enlarged. However, the Zr content has little effect on the solvus temperature of the γ′ phase. With the addition of Zr from 0 to 0.50%, γ′/γ lattice misfit degree increases from 0.215% to 0.265%, indicating that Zr enters γ′ phase and enhances the precipitation strengthening effect. 2023 Vol. 33 (02): 69-77 [Abstract] ( 6 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 78 Study on high temperature dimensional stability of silica-based ceramic cores with single particle size grading Hot! LIN Xingang，PAN Zhiping，CUI Shusen DOI: 10.13228/j.boyuan.issn1006-6543.20220079 Based on the practical demand of raw materials quality control stability, with single particle size graded fused silica powder as the matrix material and zircon as the mineralizer, silica-based ceramic cores were prepared. Excellent high-temperature flexural strength and creep resistance was obtained through doping alumina powders and adjusting the sintering temperature. The effects of alumina and sintering temperature on the high temperature dimensional stability of silica-based ceramic cores were discussed. The results show that the increasing of the alu‐ mina amount and the sintering temperature are beneficial to the crystallization of cristobalite and the sintering level of silica-based cores, leading to significantly improves of the creep resistance of silica-based cores, but slightly de‐ teriorates the high-temperature flexural strength. As the alumina doping ratio increases from 0 to 0.3%, the 1 550 ℃/30 min thermal deformation of the ceramic cores is significantly reduced from 3.86 mm to 0.54 mm, while the flexural strength at 1 550 ℃ is decreased from 27.86 MPa to 21.79 MPa. With the increasing of the sinter‐ ing temperature from 1 180 ℃ to 1 240 ℃, the thermal deformation is reduced from 3.86 mm to 0.47 mm, while the flexural strength at 1 550 ℃ is deteriorated from 27.86 MPa to 19.67 MPa. 2023 Vol. 33 (02): 78-83 [Abstract] ( 4 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 84 Study on oxidation behavior of SiC powder Hot! WANG Huifang，JIANG Wei，HAO Shiming，ZHANG Jie DOI: 10.13228/j.boyuan.issn1006-6543.20220185 The oxidation behavior of SiC particles at 1 000, 1 100、1 200 and 1 300 ℃ were studied. The morpholo‐ gy and phase changes of SiC particles before and after oxidation were investigated using SEM and XRD, and the thickness calculation formula of oxidation layer（SiO2）were also derived based on the conservation of mass. The results show that when the oxidation temperature is lower than 1 200 ℃, the oxidation rate is mainly controlled by the oxidation temperature. When the oxidation temperature is higher than 1 200 ℃, the oxidation rate of the initial oxidation is mainly controlled by the oxidation time. At 1 000 ℃, the morphology change of SiC particles is not ob‐ vious, and the oxidation product is amorphous phase. At 1 200 and 1 300 ℃, the surface deactivation of SiC parti‐ cles is obvious, and the amorphous SiO2 is gradually converted into square quartz crystals. The formula established by mass conservation could be used to predicting the thickness of oxidation layer. 2023 Vol. 33 (02): 84-87 [Abstract] ( 5 ) HTML (1 KB)  PDF  (0 KB)  ( 4 ) 88 Research status and application of laser cladding technology for Cobalt-based alloy Hot! ZHOU Liangdong，ZHANG Liang，WU Wenheng DOI: 10.13228/j.boyuan.issn1006-6543.20220080 Cobalt-based alloy is a common surface modification material, because of its excellent properties of wear resistance, corrosion resistance and high temperature resistance, it has a wide application prospect in the fields of surface modification and remanufacturing of aerospace, energy, heavy industry and marine equipment. La‐ ser cladding is a new surface engineering technology with high economic benefit, which can realize the rapid and high quality molding of material surface coating. Using laser cladding technology, high performance alloy coating can be prepared on the surface of cheap metal matrix materials, which can improve the surface properties of materi‐ als without affecting the properties of the matrix materials, and can save precious and rare metals and reduce the cost. In recent decades, laser cladding technology of cobalt-based alloy has been widely concerned by scholars at home and abroad, and many achievements have been made in the improvement of coating hardness, wear resis‐ tance and corrosion resistance, crack sensitivity and other properties. In this paper, the research status of laser clad‐ ding technology on cobalt-based alloy was reviewed, and the research status at home and abroad was summarized and analyzed from the aspects of material system, process parameters and industrial application. The shortcomings of current research were summarized and the potential development direction in the future was analyzed. 2023 Vol. 33 (02): 88-95 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 96 Hazards of nuclear radiation and research progress in radiation shielding materials Hot! CAI Yongcheng，LIU Xueyu，CAI Yongjun，HE Lin DOI: 10.13228/j.boyuan.issn1006-6543.20220083 The types and hazards of nuclear radiation are introduced in this paper. It is proposed that the main task for the nuclear shielding design is shielding neutron and γ-ray. Meanwhile, the research status of nuclear radiation shielding materials at home and abroad are summarized in detail. The principal problems for the current compre‐ hensive neutron and γ-ray shielding materials are discussed. The conflict between shielding effectiveness and other performances needs to be settled. The research on radiation shielding materials is prospected. It is pointed out that the development of structure（mechanical performance, heat resistant stability and etc）-function（neutron and γ-ray shielding properties）integration radiation shielding materials is the future developing trend. 2023 Vol. 33 (02): 96-102 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 103 Research status of powder rolling technology Hot! WANG Miao，LI Rong，CAO Boyuan，REN Shangyuan，LIU Gaojian DOI: 10.13228/j.boyuan.issn1006-6543.20220061 The powder rolling process is introduced. The process parameters and technological improvement of powder rolling technology and the semi-solid powder rolling technology developed based on powder rolling are discussed. The application of powder rolling technology in recent years is elaborated. Finally, the technologies are summarized and prospected. 2023 Vol. 33 (02): 103-108 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 109 Optimization design of cyclone separator based on nonlinear programming Hot! WANG Yang，LIU Yiliang，WANG Lei，SONG Yindong DOI: 10.13228/j.boyuan.issn1006-6543.20220082 As an important gas-solid two-phase separation equipment in industrial production, cyclone separator is widely used in shipbuilding, petrochemical, coal-fired power, resource development. According to the theory of tur‐ bulent mixing laminar flow separation, regarding the actual physical parameters of particles in dusty air and the structure size of cyclone dust collector as the variable, the corresponding mathematical model of collecting effi‐ ciency was established, which based on the semi-empirical design method of cyclone dust collector proposed by classical Leith-Licht theory. According to mathematical model, the optimization objective function was pro‐ posed, which was used to optimize the size of cyclone separator by self code. Finally, combined computational flu‐ id dynamics（CFD）method, the dust removal efficiency of the optimized model was verified. The simulation results show that the theoretical calculation of the mathematical model is in great agreement with the simulation results, the error is only 1.41%. This method overcomes some shortcomings such as long period of experimental verification and poor economy, which also has important engineering application value to the optimum design of cyclone separator. 2023 Vol. 33 (02): 109-115 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 116 Inspection and analysis of powder forging connecting rod after shot blasting Hot! XU Yonggang，ZHENG Haichao，LI Qiang，LI Zhen，ZHOU Xin，YANG Zhen DOI: 10.13228/j.boyuan.issn1006-6543.20210025 In order to detect and study the performance of powder forged connecting rods after shot blasting quickly and accurately，X-ray diffraction method was used to test the shaft parts of the powder forged connecting rod， and the residual compressive stress distribution and numerical change trend of the surface before and after shot blasting. The microstructure and crack growth were analyzed. The results show that the surface densification of the powder forged connecting rod is improved after shot blasting strengthening，and the value of the residual compressive stress on the surface is increased，which is conducive to improving the fatigue strength of the powder forged connecting rod and reducing the initiation of fatigue cracks，thus improving the service life of the powder forged connecting rod，and has certain guiding significance for the production of the powder forged connecting rod. 2023 Vol. 33 (02): 116-119 [Abstract] ( 6 ) HTML (1 KB)  PDF  (0 KB)  ( 2 )

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