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Quick Search     Adv Search   2021 Vol. 31, No. 05 Published: 2021-10-10   1 Progress in preparation technology of porous Ni-Al intermetallics Hot! WANG Jianzhong，WANG Hao，YANG Kun，HUANG Yuanping DOI: 10.13228/j.boyuan.issn1006-6543.20210124 Ni-Al intermetallics have received widespread attention owing to its low density, good thermal conductivity, excellent high temperature mechanical properties and high temperature oxidation resistance and so on. So, it is expected that Ni-Al intermetallics can be used as high temperature structural material to replace traditional stainless steel and nickel- base superalloy. Porous Ni-Al intermetallics traditional dense Ni-Al intermetallics with the characteristics of functionality and lightweight. Therefore, porous Ni-Al intermetallics can be used as the filter materials or catalyst in high temperature oxidation environment and acid-base corrosive condition. Based on the raw materials and preparation processes, the prepration technology of porous Ni-Al intermetallics can be divided into three classes: powder metallurgy method (including reaction and combustion synthesis methods), chemical dealloying method and directional solidification method. In addition, the characteristics and pore construction methods of various technologies are analyzed, and the future development trend is also expected. It is hoped that the combination of various preparation technologies to expand their application fields and solve engineering need. 2021 Vol. 31 (05): 1-10 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 11 Microstructure of 18Ni300 maraging steel powder prepared by vacuum-inducedmelt gas atomization Hot! KONG Shuilong，SHI Lei，LI Feng，JIN Ying，WENG Ziqing，SHI Jinguang DOI: 10.13228/j.boyuan.issn1006-6543.20200220 18Ni300 maraging steel powder was prepared by vacuum- induced- melt gas atomization(VIGA). The size distribution, morphology and microstructure of the powder was investigated by laser particle size analyzer, scanning electron microscopy (SEM) and X- ray diffraction(XRD). The results show that the partical size of 18Ni300 maraging steel powder is normal distributed , the medium diameter is 74.22 μm, and the mass fraction of the powders partical size less than 45 μm is up to 28.6% . The powder is spherical or near-spherical. With the increasing of partical size, the worse micro-morphology with satellite-grains around the surface and the gas-hole in the powders appear. The inner micro-structure of the powders less than 45 μm is swelling crystal. Dendrites appear, the width of primary crystal axis and secondary dendrite arm spacing increase with the partical size growing, even the radial secondary dendrites appear. The phase of the powder is bcc-structure martensite , with no obvious peak of Ni3X strengthen phase. 2021 Vol. 31 (05): 11-15 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 16 Thermal deformation behavior and constitutive relationship ofW-20Cu composites Hot! WANG Linghao，WU Xianming，MO Yumei DOI: 10.13228/j.boyuan.issn1006-6543.20200113 The high temperature thermal deformation behavior of W-20Cu composites at strain rates ranging from 0.01-5 s-1 and temperature ranging from 800-1 000 ℃ was studied by thermal simulation compression test. The microstructure after material compression deformation was observed and studied by SEM. The results show that W- 20Cu composites have high strain rate strengthening effect and temperature softening effect. The ideal condition for thermal deformation processing is 900-950 ℃, and the strain rate should below 1 s-1. In the process of material thermal deformation, there is an obvious Cu stripe aggregation phenomenon, which promotes the densification of materials, and the densification effect of high temperature and low strain rate is more significant. The Arrhennius constitutive equation of the material is established by using the experimental data and the polynomial function relation of true strain is modified and fitted to the parameters of the equation. Through comparative analysis, the modified constitutive equation can describe the high temperature rheological behavior of materials well. 2021 Vol. 31 (05): 16-21 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 22 Modal analysis of powder metallurgy brake pads applied in mining trucks Hot! ZHU Qiang，HUANG Meiqi，QIAN Haihui，DING Fusheng，Lü Hongming DOI: 10.13228/j.boyuan.issn1006-6543.20200107 To improve the service life of friction materials, sintered- powder materials are replacing resin- based ones in the fields of traffic tools and industry machines. However, the problem of brake noise occurred occasionally limits the material’s widespread application due to the mode-coupling of a brake system. In this paper, a powder metallurgy brake pad applied in a heavy-duty mining truck is modeled and analyzed by using the finite element software of Abaqus. The first eight orders of natural frequencies and mode shapes are computed and verified by hammering experiment. The constrained modes of the brake pad vary a lot from the free-free modes in the natural frequencies as well as in the mode shapes. Then the influence factors on the constraint modal characteristics of the brake pad are analyzed from the aspects of the Young’s modulus, thickness and slot number of the friction block and the thickness of the back plate, which is helpful for designing powder metallurgy brake pads with low-noise properties. 2021 Vol. 31 (05): 22-26 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 27 Development of additive manufacturing technology for cable bracket assembly of automobile side door Hot! ZHOUWeixing，PENG Jingguang，CHEN Di DOI: 10.13228/j.boyuan.issn1006-6543.20200280 In this paper, taking the bracket assembly of a automobile rear side door actuator cable guide device as the object, combined with the advantages of additive manufacturing technology, the additive manufacturing process of bracket assembly is studied, including material selection, structure optimization, model processing and process parameter setting. The final product meets the dimensional accuracy requirements of assembly. It is found that the key steps in the process are the selection of substitute material glass bead reinforced PA12, optimization of model clasp structure and appropriate setting of process parameters. Finally, through the product cost analysis, it shows that additive manufacturing technology has obvious cost advantage in the field of automobile aftermarket parts remanufacturing. 2021 Vol. 31 (05): 27-32 [Abstract] ( 4 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 33 Effect of Mo doping on high temperature oxidation resistance of Si-Ti-Hf coating for Ta-10Walloy Hot! SHENG Xiaochen，MENG Jia，YAN Biao，LE Jun DOI: 10.13228/j.boyuan.issn1006-6543.20200247 In order to solve the problem of "pest" oxidation of tantalum tungsten alloy(Ta-10W) at 500 ℃, a more uniform, dense and smooth coating was prepared on the surface of Ta-10W alloy by fused slurry method through doping Mo element in Si-Ti-HF slurry, which could adjust the thermal expansion coefficient of the coating in this paper. The effect of different content Mo element on the high temperature oxidation resistance of the coating was studied. The more Mo element is doped, the closer the thermal expansion coefficient of the coating is with the substrate, the less microcracks and the better oxidation resistance is with the coating. At the same time, the higher the content of MoSi2 formed in the coating, the more MoO3 oxidized into gas, which is not conducive to the high temperature oxidation resistance of the coating. When 2% Mo is doped, the high temperature oxidation resistance of the coating is the best, and the oxidation resistance and failure mechanism of the coating are analyzed. 2021 Vol. 31 (05): 33-39 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 40 Microstructure and thermal shock properties of YSZ composite thermal barrier coatings on titanium alloy substrate Hot! LIU Xinyu，ZHOUWuping，XIONG Ning，DU Zhong，ZHANG Baohong DOI: 10.13228/j.boyuan.issn1006-6543.20210068 Thermal barrier coatings (TBCs) is a crucial technique to improve the upper service temperature of titanium alloy in aerospace field. In this paper, three kinds of TBCs were deposited on TA15 titanium alloy by atmospheric plasma spraying process. The phase structure, microstructure and thermal shock life of coatings were investigated for better understanding of the failure mechanism. The results show that T 'phase is formed in the assprayed coating (c/( 2 a)≤1.01), and no phase transformation occurs during the thermal shock process. The thermal shock life of GYYSZ /8YSZ composite coating is 2.6 times higher than that of single 8YSZ coating and 3 times higher than that of single GYYSZ coating. Mismatch of thermal expansion coefficient, low coating tensile strength, and the formation of oxides on the surface of titanium matrix, result in the failure of TBCs. 2021 Vol. 31 (05): 40-47 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 48 Effect of CeO2 on the properties of Fe-based matrix diamond tool Hot! WEN Lu，ZHOU Qiang，WEI Shichao，LUO Li，PAN Xixiang DOI: 10.13228/j.boyuan.issn1006-6543.20200261 Different content of CeO2 powder was added to Fe-based prealloy powder, and diamond tool matrix was prepared by hot pressing sintering method. The microstructure and mechanical properties of the matrix of sintered segment were characterized and tested. The results show that under the same process, the matrix hardness, bending strength and correlation density is very high, when the mass fraction of CeO2 is 0.5%, CuNi2Sn phase appears in the matrix of sintered segment, the mechanics comprehensive performance of the matrix is best, with the highest relative density of 0.958 4 and hardness of 320.75HV0.3, which is 16.83% higher than that without CeO2. At this time, the bending strength also reaches the highest value of 1 515 MPa, the dimples of matrix fracture become deeper, the grain boundary is obvious, the fracture mode is mainly intergranular fracture, CeO2 particles are distributed in the grain and the grain boundary, and the voids inside the matrix spheroidize and round obviously, which plays a dispersion strengthening role in the matrix alloy. 2021 Vol. 31 (05): 48-53 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 54 Microstructure and properties of SiCp/Cu composites prepared by powder metallurgy Hot! ZHANG Xiaohong，SUN Shangqing，WANG Zhengran，HU Lianxi DOI: 10.13228/j.boyuan.issn1006-6543.20200299 SiC particle dispersion strengthened copper matrix (SiCp/Cu) composites using high purity SiC powder and Cu powder as raw materials were prepared by mechanical ball milling and vacuum hot pressing sintering. SEM and XRD were used to study the change of powder morphology, powder uniformity and average particle size during ball milling. At meantime, the microstructure, mechanical properties and physical properties of SiCp/Cu composites prepared by vacuum hot pressing sintering process were studied. The results show that the composition of SiCp/Cu composite powder is uniform after 10 h ball milling with the ball milling speed of 250 r/min and the ratio of ball to material 10:1 (mass ratio). The relative density of the composites prepared by vacuum hot pressing sintering is more than 92%, and the SiC reinforced particles are evenly distributed, which has good mechanical properties and thermal conductivity. Among which, the composite prepared at 850 ℃ for 1 h has better comprehensive properties, with density of 96.2%, thermal conductivity of 221.346 W/(m · K), conductivity of 65.3%IACS, compressive strength of 467.46 MPa and fracture strain of 20.87%. 2021 Vol. 31 (05): 54-60 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 61 Influence of FeSiCr magnetic particle pelleting size distribution on its properties Hot! ZHOU Yongchuan，WU Xianjun，XIE Zhou DOI: 10.13228/j.boyuan.issn1006-6543.20200102 Samples of FeSiCr rings were prepared by insulation coating particle of different pelleting particle size distribution and tested for physical and electromagnetic properties. The results show that compared with magnetic particle with D50 of 62.497 μm and 95.788 μm, the powder with the proper particle size distribution (D50 is 74.290 μm) is more conducive to the uniformity of the powder filling, reducing the pore size and number, and higher density of the forming core, improves the saturation magnetic induction strength and effective permeability of the magnetic ring. more excellent comprehensive performance can be obtained. 2021 Vol. 31 (05): 61-65 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 66 Microstructure and mechanical properties of fine-grained TC4 alloy prepared by powder metallurgy Hot! ZHANG Hui，ZHAO Yabin，PAN Aiqiong DOI: 10.13228/j.boyuan.issn1006-6543.20210027 In the present work, fine-grained TC4 titanium alloy was prepared by the means of vacuum hot pressing sintering + hot extrusion + annealing treatment. The evolution of microstructure and mechanical properties of titanium alloy during the preparation were studied. The results show that the hot-pressed sintered TC4 titanium alloy is mainly composed of α and β phase, α phase is distributed in an equiaxial manner and β phase is distributed in the inner grain or grain boundary of α phase with an elongated lamellar/acicular. After hot extrusion, the grain sizes of TC4 titanium alloy obtained by vacuum hot-pressing sintering can be significantly reduced to form fine-grained microstructure, which is benefit for the improvement of tensile strength from 837 MPa to 983 MPa. However, the fracture elongation is the lowest at 9.6%. Further annealing can restore and recrystallize the hot extruded TC4 titanium alloy, especially the β phase grains formed equiaxed grains and distributed around the α grains in a spot-like manner, which is beneficial to improve the plasticity and toughness of TC4 titanium alloy. Therefore, the fine-grained TC4 titanium alloy obtained by hot pressing sintering + hot extrusion + annealing treatment has relatively excellent comprehensive properties. 2021 Vol. 31 (05): 66-70 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 71 Effect of solid solution on microstructure of SiC/ZM5 magnesium alloy sprayed into automotive copper mold Hot! DING Lanhua，JIN Huiling，YANG Yanan DOI: 10.13228/j.boyuan.issn1006-6543.20190246 The ZM5 magnesium alloy was prepared by spray casting of copper mold, and the SiC/ZM5 magnesium alloy was prepared by adding SiC particles by mechanical compaction, which was strengthened by high temperature solution process. The grain refining effect and microstructure evolution caused by adding SiC particles into magnesium alloy were analyzed. The microstructure characteristics obtained under different solution temperatures and the grain refining effect realized by SiC particles were tested and analyzed. The results show that α-Mg in SiC/ZM5 magnesium alloy has the crystal structure of HCP, and the addition of SiC is helpful to obtain nucleation points and achieve the effect of grain refinement. A large amount of Al and some Si exist in the grain boundary region. The solution process can make the divorced eutectic β-Mg17Al12 structure formed at the grain boundary interdissolve with the alloy matrix. The transformation of the second phase into other tissues can promote the transfer of SiC particles and agglomerate in the grain boundary region. When the solution temperature is increased, the eutectic phase of SiC/ZM5 magnesium alloy disappears faster and the hardness decreases. 2021 Vol. 31 (05): 71-75 [Abstract] ( 4 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 76 Microstructure and hardness analysis of TiC/TiB2 powder coating on Ti600 alloy surface for internal combustion engine Hot! LIU xia，ZHAO Haitao DOI: 10.13228/j.boyuan.issn1006-6543.20190106 The cladding layer with TiC/TiB2 structure was prepared by combining electromagnetic field and laser in situ treatment. The results show that the corresponding diffraction peaks of α-Ti and TiB are formed in the cladding layer before and after the implementation of electromagnetic field. After being affected by the electromagnetic field, the cladding layer containing only TiB is formed, which forms a longer needle-like structure and no granular structure. The cladding layer achieves a higher hardness than the matrix. When the upward lorentz force is set, the micro-hardness of the cladding layer is equal to 620HV. When a downward lorentz force is formed, the microhardness of the cladding layer is equal to 550HV. Under the action of steady state magnetic field, only needle-shaped and rod-shaped tissues were formed in the cladding layer, and the induced lorentz force obtained under the action of steady state magnetic field could not have a great influence on the network structure of the cladding layer. 2021 Vol. 31 (05): 76-80 [Abstract] ( 3 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 81 The effects of addition of rare earth elements on microstructure and properties of titanium alloys Hot! JIANG Hanhong，JIANG Zhongtao DOI: 10.13228/j.boyuan.issn1006-6543.20200240 The application of rare earth elements in titanium alloys was reviewed in this paper. The effects of Nd, Y, Gd, Er and La on microstructure, mechanical properties, creep property, oxidation resistance and thermal stability of titanium alloys were summarized. The existence form of rare earth elements, adding amount and mode of rare earth elements in titanium alloy was analyzed. Improvement measures were put forward to optimize the properties of titanium alloy doped with rare earth elements. Based on the research status of titanium alloys containing rare earth elements, this paper points out the limiting factors for their industrial application, analyzes their application prospect and future development direction, and puts forward some suggestions in order to provide reference for the study of titanium alloys. 2021 Vol. 31 (05): 81-86 [Abstract] ( 7 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 87 Research process in powder metallurgy hot isostatic pressing technology of titanium alloy Hot! XUE Songhai，XIE Jiaqi，LIU Shibing，SHI Kun，ZHANG Zhiyong，LIU Hongyu DOI: 10.13228/j.boyuan.issn1006-6543.20200270 The emergence of titanium alloy powder metallurgy hot isostatic pressing technology broke the original technical route of titanium alloy casting and forging, improved the mechanical properties of titanium alloy materials, increased the material utilization rate and accelerated the product production cycle. This paper systematically introduces the technical characteristics, powder preparation, densification process and simulation status of titanium alloy powder metallurgy hot isostatic pressing, summarizes the development and application at home and abroad, and proposes the development trend of this technology. 2021 Vol. 31 (05): 87-93 [Abstract] ( 1 ) HTML (1 KB)  PDF  (0 KB)  ( 3 ) 94 Research progress and prospect of FeSiAl alloy powder for microwave absorption Hot! GUO Yang，HU Liming DOI: 10.13228/j.boyuan.issn1006-6543.20210023 FeSiAl alloy powder is one of the ideal candidates for microwave absorbing materials due to its high permeability, high saturation magnetization and low cost. This article summarizes the characteristics of FeSiAl alloy powder, and expounds the influence of microstructure control and composition optimization on the electromagnetic properties. In view of the high permittivity of the flake FeSiAl alloy powder, the regulation mechanism of microwave absorption performance is discussed mainly by technical means such as surface coating, micro-oxidation, and compounding technique. Finally, the future research direction of FeSiAl powder is prospected 2021 Vol. 31 (05): 94-98 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 99 Effect of cutting speed on the wear of rake face in high speed milling on ADC12 aluminum alloy Hot! MI Shaowei，LIN Youxi，MENG Xinxin DOI: 10.13228/j.boyuan.issn1006-6543.20200249 ADC12 Aluminum alloy has good plasticity and high corrosion resistance, is widely used in aviation, automobile and other industries. Because the aluminum alloy is soft and easy to adhere to the rake face of tool, the high speed milling test of ADC12 aluminum alloy was carried out in this paper. The relationship between cutting speed, cutting force and the amount of bonding on the rake face of tool was studied, and the mechanism of tool adhesive wear was analyzed. The results show that with the increase of milling speed, the cutting force and the bond amount both increase first and then decrease, the cutting force reaches the maximum at 600 m/min, and the bond amount of the rake face also reaches the maximum. The cutting force has a significant effect on the bond amount of the rake face. Rake face of the main wear form is adhesive wear, after cutting tool surface oxidation film is damaged, rake face of rapid formation of adhesive layer, adhesive layer under the impact of the "loading and unloading" force, crack first, then come off to form a new bond layer, bonding layer peel away on the surface of the cutting tool material, result in adhesion wear of cutting tool. 2021 Vol. 31 (05): 99-104 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 2 ) 105 Study on amorphous soft magnetic powder with high sphericity Hot! MENG Lingbing，YU Haichen，Lü Shiya，JIANG Zhongmin，MAHongqiu， GUAN Lidong DOI: 10.13228/j.boyuan.issn1006-6543.20210074 The magnetic amorphous powders with high sphericity were prepared by water- air atomization. The morphology and phase constituents of powders were analyzed by scanning electron microscopy and X-ray diffraction. The results show that the alloy composition and powder particle size have great effect on the sphericity and glass forming ability of amorphous powder. The magnetic hysteresis loop and coercivity of the amorphous powder were measured by vibrating sample magnetometer. The amorphous powders were pressed into soft magnetic powder core, then the effective permeability, DC bias and core losses of core were measured and discussed. The research indicates that the particle size, degree of amorphization, saturation magnetization and coercivity of magnetic amorphous powder have great influence on the magnetic properties of theamorphous powder core. 2021 Vol. 31 (05): 105-110 [Abstract] ( 2 ) HTML (1 KB)  PDF  (0 KB)  ( 1 ) 111 Progress on high-abundance rare earth permanent magnet materials Hot! CHEN Xinshuo，FENG Haibo，LI Anhua DOI: 10.13228/j.boyuan.issn1006-6543.20200011 Rare earth elements exist in minerals in the form of co-associated state. LaCe accounts for 73% in the north rare earth ore and LaY accounts for 50% in the south rare earth ore associated with heavy rare earth. Massive high abundance La/Ce/Y rare earth was not used when extracting Pr、Nd from ore. Therefore, fabrication and application of the high abundance rare-earth permanent magnets are important for balanced utilization of Chines rareearth resource. Herein, the fabrication and properties of high abundance rare-earth permanent magnets, were summarized and the controlling technique on microstructure and properties of the La/Ce/Y containing magnets were introduced. Finally, the development of high abundance rare-earth permanent magnets is discussed and prospected. 2021 Vol. 31 (05): 111-115 [Abstract] ( 4 ) HTML (1 KB)  PDF  (0 KB)  ( 2 )

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