Home  |  About Journal  |  Editorial Board  |  Instruction  |  Subscribe  |  Advertisement  |  council  |  Contact Us  |  中文

Forthcoming Articles       Current Issue       Advanced Search       Archive       Download Articles       Read Articles       Email Alert

Quick Search     Adv Search   2021 Vol. 31, No. 02 Published: 2021-04-10   1 Development status and prospect of copper-based powder industry in China Hot! LI Zhanrong，ZHOU Youzhi，ZHANG Jingguo，ZHANG Xu，FU Dongxing， HE Huijun，WANG Limin DOI: 10.13228/j.boyuan.issn1006-6543.20200246 China is the world's largest producer of copper-based powders. It has reached or surpassed other developed countries in terms of technology. The development of copper-based powder industry, technology and application in China, including electrolytic copper powder, atomizing copper and copper alloy powder, diffusion and bonding powder, coating powder, ultrafine copper-based alloy powder, ultrafine and nano powder, copper powder for additive manufacturing were introduced. Also, the development directions of copper-based industrial technology and equipment, copper-based powder multi-element complex powder, ultrafine and nano powder, spherical powder for additive manufacturing, and the development directions and applications were presented. 2021 Vol. 31 (02): 1-11 [Abstract] ( 11 ) HTML (1 KB)  PDF (19567 KB)  ( 9 ) 12 Study on production process of laser cladding alloy powder for middle trough Hot! LIU Zenglin，HANWei DOI: 10.13228/j.boyuan.issn1006-6543.20200057 A kind of manufacturing process of metal alloy powder by gas atomization laser cladding , including batching, smelting, atomization, gas flow classification, and other processes were introduced. The particle of metal powder produced by this method is close to ball shape with high apparent density, good fluidity and low oxygen content. Through laser cladding test, the cladding layer was dense and uniform, free from cracks and pores, and the body did not crack. It was a complete metallurgical combination with the substrate. The hardness could reach to HRC50 or more. Comparing with the original middle trough, the service life of the middle trough of the scraper conveyor is more than 5 times longer, which can provide a high quality metal powder raw material for the laser cladding industry. 2021 Vol. 31 (02): 12-16 [Abstract] ( 8 ) HTML (1 KB)  PDF (4013 KB)  ( 5 ) 17 Research on reaction kinetics of NiO powder reduction reaction with CO based on thermogravimetric analysis Hot! QU Yanjie，ZHONGWuye，ZHENG Jianping，GUO Zhimeng DOI: 10.13228/j.boyuan.issn1006-6543.20200014 Reaction kinetics between NiO powder with two different particle sizes and mixed gas with different CO2/CO proportion was researched based on thermogravimetric analysis. And the conversion of NiO was discussed by carbon deposition characteristic of NiO powder before and after reaction. It was found that the initial temperature for NiOpowder reduction reaction with CO was 420 ℃, and the reaction rate and conversion of NiO increased with higher temperature. Carbon deposition of NiO powder influence the conversion of NiO badly, which make reaction transfer from chemical reaction control to diffusion control. And reducing the concentration of CO can reduce the influence that carbon deposition acts to conversion. 2021 Vol. 31 (02): 17-22 [Abstract] ( 0 ) HTML (1 KB)  PDF (8656 KB)  ( 4 ) 23 Preparation and oxidation behavior of Si-Ti-Hf high temperature anti-oxidation coatings on Ta-10Walloy Hot! SHENG Xiaochen，MENG Jia，YAN Biao，LE Jun DOI: 10.13228/j.boyuan.issn1006-6543.20200245 Tantalum alloy(Ta-10W) has been widely used in high-temperature structural materials due to its hightemperature strength, good corrosion resistance, good ductility and solderability. But its poor high-temperature oxidation resistance at 500 ℃ is the main factor restricting its application, so it must be protected with an anti-oxidation coating at the surface. The uniform, dense and smooth Si-Ti-Hf silicide coating was prepared by fused slurry method on the surface of Tantalum alloy. The high temperature oxidation resistance of the coating which could effectively protect tantalum tungsten substrate from oxygen attack was excellent. 2021 Vol. 31 (02): 23-30 [Abstract] ( 4 ) HTML (1 KB)  PDF (7087 KB)  ( 4 ) 31 Ni/WC composite coating prepared by magnetic field controlled plasma transfer arc welding Hot! ZHANG Huijian，HUANG Haihong，ZHAO Lunwu，LIU Zhifeng，ZHU Libin DOI: 10.13228/j.boyuan.issn1006-6543.20190235 Aiming at the problem of WC sinking in preparing Ni/WC composite coating, the coating was fabricated by plasma transfer arc welding technology under the applied external magnetic field. The distribution of Ni/WC coating plus WC particles under the applied magnetic field was investigated, and the microstructure and properties of the coating were characterized by vickers durometer, SEM, OM and EDS. The results showed that WC was deposited near the coating fusion line when no magnetic field was applied, while WC particles were concentrated in the middle area of the coating when the magnetic field was applied, with a distance of 420 μm from the bottom of the area to the coating fusion line. The hardness of the coating fluctuated with the applied magnetic field. The maximum value of the hardness was 1400HV without external magnetic field, and it was 1450HV with external magnetic field. In the experiment, WC particles almost did not melt and the particle morphology remained intact. The magnetic field refines the coating structure, promotes the generation of hard phase and improves the hardness of the coating. The external magnetic field solves the problem of WC subsidence and could be adjusted according to the engineering requirements. 2021 Vol. 31 (02): 31-36 [Abstract] ( 1 ) HTML (1 KB)  PDF (4685 KB)  ( 3 ) 37 Effect of rare earth La addition on optimizing preparation of tiny Fe-Cu prealloyed powder Hot! SUN Zhuonan，LI Chengwei，SONG Yitong，LIU Qian，LIU Shuai，LIU Hongwei DOI: 10.13228/j.boyuan.issn1006-6543.20200123 Fe-Cu prealloyed powder was prepared by mechanochemical method with lanthanum oxide as adjuvant. The effects of rare earth La on the reduction temperature, the micro morphology and particle size of the reduced powder were studied. The particle size distribution, micro morphology, element distribution and phase composition of Fe-Cu prealloy powder were characterized by laser particle size analyzer, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The results show that the average particle size of Fe-Cu pre alloyed powder prepared by mechanical chemical method with lanthanum oxide as adjuvant at 700 ℃ and holding for 40 min is 0.4 μm, it is a uniform solid solution, and adding a certain amount of La can not only effectively reduce the reduction temperature required for the preparation of Fe-Cu prealloyed powder, but also inhibit the growth of powder particles, reduce powder size. 2021 Vol. 31 (02): 37-40 [Abstract] ( 1 ) HTML (1 KB)  PDF (3360 KB)  ( 4 ) 41 Discussion on mechanism of eliminating prior particle boundary in powder metallurgy superalloy Hot! ZHANG Mengdi，LIU Jiantao，ZHANG Yiwen，XING Pengyu，JIA Jian DOI: 10.13228/j.boyuan.issn1006-6543.20200206 SEM and TEM were used to study types and composition of carbides inside superalloy powder particles and alloys. The thermodynamic software was used to calculate the composition of carbides in FGH4096 with different Hf contents. Results showed that precipitates on the prior particle boundary(PPB) in the studied PM superalloy were mainly MC-type carbides of TiC, and the solubility of MC-type carbides (TiC,ZrC,HfC,NbC,TaC) in nickelbased superalloys was in the order of TiC>NbC>TaC>ZrC>HfC. The solubility of TiC in FGH4096 is higher than that of HfC. During the rapid solidification process of atomized powders, the precipitation of carbides in FGH4096 alloy with Hf is greater than that without Hf, and the HfC uniformly nucleate in the whole powder. In the process of hot isostatic pressing, the binding force of Hf and C is strong, thus forming the HfC. Finally, the (Hf,Ti,Nb)C is formed in FGH4096 so that the C element can not diffuse to the surface of powder particles to form the TiC, avoiding the formation of PPB. The mechanism of Zr to eliminate the PPB in FGH4096 is the same as Hf. 2021 Vol. 31 (02): 41-46 [Abstract] ( 2 ) HTML (1 KB)  PDF (3623 KB)  ( 3 ) 47 Research on dynamic mechanical properties of SiCp/2024Al composites prepared by hot-pressing sintering Hot! XIEWenfang，WANG Hang DOI: 10.13228/j.boyuan.issn1006-6543.20200001 30% SiCp/2024Al composites was prepared by vacuum hot-pressing sintering, and a dynamic compression experiment was performed using a Split Hopkinson Pressure Bar (SHPB) to obtain a dynamic stress with a strain rate of 1 600-3 800 s-1 strain curve. The results show that the trend of stress-strain curve of 30%SiCp/2024Al composites material does not change much under different strain rates when subjected to dynamic load in a certain range of high strain rates, which is basically rate- insensitive material. The specimens don’t show macroscopic shear failure under dynamic impact. Scanning electron microscopy (SEM) is used to characterize the microstructure of the compressed specimens. Damages such as holes and microcracks appeare inside the specimens, and debonding of reinforcement particles occurre at the specimen boundaries. The material shows good plastic toughness. This paper also discusseses the fundamentals of compressive deformation under dynamic loading. 2021 Vol. 31 (02): 47-51 [Abstract] ( 0 ) HTML (1 KB)  PDF (4332 KB)  ( 5 ) 52 Effect of magnetic field velocity on electrolysis process and quality of Cu electrode used in sensor Hot! SUN Juan，SUN Li，JIN Han DOI: 10.13228/j.boyuan.issn1006-6543.20200137 The effect of magnetic field velocity on the electrolytic process and the quality of Cu electrode used in the sensor was analyzed.The results show that a more complex copper electrolysis reaction is formed by applying a magnetic field.After increasing the magnetic field velocity, the mass loss of copper anode decreased, and the maximum cathode precipitation appeared at the flow rate of 0.25 m/s.The magnetic field velocity has a significant effect on the impurity ions in Cu electrode electrolysis stage.The concentration of impurity ions decreases after the magnetic field is applied, and the actual effect is influenced by the magnetic field orientation and the flow velocity.At the magnetic field velocity of 0.25 m/s, the maximum cathode precipitation rate can be obtained, thus reducing the concentration of impurity ions in the electrolyte and reducing the copper loss.In the vertical magnetic field, the electrolyte viscosity in the range of 0~0.75 m/s is basically constant, and reaches the minimum value at 0.25 m/s.Vertical magnetic field can inhibit electron transport and enhance diffusion.With the increase of flow rate, Cu2+ diffusion process was hindered, and the maximum cathode precipitation was obtained at the rate of 0.25 m/s. 2021 Vol. 31 (02): 52-56 [Abstract] ( 0 ) HTML (1 KB)  PDF (1787 KB)  ( 4 ) 57 Crack analysis of Ni3Al alloy formed by direct laser deposition Hot! YUE Jintao，PANG Jianming，ZHAO Lin，ZHU Yichao，LIANG Yaojian， ZHOU Shangcheng DOI: 10.13228/j.boyuan.issn1006-6543.20200277 Direct laser deposition forming technology provides wider application scenarios for Ni3Al alloys, but the tendency of thermal cracking during forming limits its application. The hot cracking problem of Ni3Al alloy laser direct deposition forming has been studied and discussed, the crack formation mechanism is explored through micro characterization and mechanical property test, and the solution to optimize process optimization is proposed. The results show that Ni3Al alloy has obvious thermal cracking tendency during laser direct deposition forming, and macro and micro intergranular cracks will occur. The enrichment of Ti and Al elements at grain boundaries caused by dendrite segregation promotes the formation of γ/γ′ eutectic phase, which weakens grain boundary. In the process of rapid thermal cycling, the accumulation of residual stress causes the crack to propagate along the grain boundary. By improving the forming atmosphere and optimizing the laser process to reasonably reduce the energy density of the laser line, the thermal cracking tendency of direct laser deposition forming of Ni3Al alloy can be effectively overcome, and the crack-free additive manufacturing of components can be realized. 2021 Vol. 31 (02): 57-62 [Abstract] ( 0 ) HTML (1 KB)  PDF (2448 KB)  ( 4 ) 63 Effect of sintering temperature on the properties of 30TiC-0.5%C-Fe steelbonded carbide Hot! FAN Xingping，WANG Benju，MALan，FAN wei，LI Junhan DOI: 10.13228/j.boyuan.issn1006-6543.20200034 The 30TiC-0.5%C-Fe steel-bonded carbide was prepared by mixed powders and vacuum sintering. The effects of sintering temperature on the morphology, microstructure and mechanical properties of sintered samples were investigated. The results show that the microstructure of the steel-bonded carbides is improved with the increase of sintering temperature. The values of the hardness and impact toughness of the steel-bonded carbides increase with the increase of the sintering temperature. When sintering at 1 400 ℃ , the hardness and the impact toughness are 64HRC and 25 J/cm2 respectively．When the sintering temperature reaches 1 450 ℃, the surface of the sample melts and the expected shape can not be obtained. 2021 Vol. 31 (02): 63-67 [Abstract] ( 3 ) HTML (1 KB)  PDF (8361 KB)  ( 5 ) 68 Powder-solid diffusion bonding of 2A12 aluminum alloy powder toTi-6Al-4V using hot isostatic pressing technology Hot! GUO Yanqing，WANG Gang DOI: 10.13228/j.boyuan.issn1006-6543.20200038 Joining of two dissimilar aerospace alloy 2A12 aluminum alloy powder and Ti-6Al-4V was carried out using Hot Isostatic Pressing（HIP）technology. The effect of Cu as interlayer on the property of diffusion bonding joint was stuied. The results showed that, three different intermetallic compounds were formed in the diffusion bonding joint when 2A12 aluminum alloy powder and Ti-6Al-4V were directly diffusion bonding using HIP and the existed of intermetallic compounds had adverse effect on the property of diffusion bonding joint; The diffusion phenomenon mainly occurred in the side of Cu/Al and the liquid phase prepared by eutectic reaction of Cu/Al penetrated the interface among the aluminum alloy powders. The micro-hardness decreased and the shear strength increased when the Cu as interlayer compared with directly diffusion bonding using HIP. The shear strength increased by 64%, reached 23 MPa. 2021 Vol. 31 (02): 68-73 [Abstract] ( 1 ) HTML (1 KB)  PDF (3376 KB)  ( 2 ) 74 Microstructure and mechanical properties of Ti-22Nb-2.5Zr-1.5Mo alloy for internal combustion engine by powder sintering Hot! LI Shicun DOI: 10.13228/j.boyuan.issn1006-6543.20190036 Spark Plasma Sintering（SPS）was used to prepare the Ti-22Nb alloy for internal combustion engine. The microstructure and mechanical properties of the Ti- 22Nb alloy after the solid solution and aging treatment were tested.The results show that the microstructure components are composed of β phase and α phase，and the Ti- 22Nb alloy prepared by SPS method under different heat treatment process transforms from β phase to ω phase， and then to α phase.The Ti-22Nb alloy after 550 ℃ aging treatment gains smaller α phase than that of the Ti-22Nb alloy prepared by conventional technology after heat treatment. Ti-22Nb alloys under 830 ℃ solid solution treatment have excellent mechanical properties than the alloy prepared by conventional method，the tensile strength increases about 100 MPa.Proper heat treatment process can help the ally obtain better comprehensive mechanical properties. 2021 Vol. 31 (02): 74-77 [Abstract] ( 1 ) HTML (1 KB)  PDF (1994 KB)  ( 2 ) 78 Effects of laser selective melting parameters and heat treatment on microstructure and properties of TA15 titanium alloy Hot! GUO Minghai, GAO Peibao, LIU Bin, LI Guangsheng, ZHANG Yingwei, XIANG Zefeng DOI: 10.13228/j.boyuan.issn1006-6543.20200082 The effects of laser power and scanning speed on the forming defects were studied using orthogonal test. Besides TA15 titanium alloy was prepared by using the optimal parameters. The effects of heat treatment temperature on microstructure and mechanical properties were further studied as well. The results show that the best forming effect can be reached by combining the laser power at 275~280 W and the scanning speed at 1 100~1 250 mm/s. Moreover, when annealed below 860 ℃, by increasing the annealing temperature, the strength of the alloy decreases, while the plasticity increases. The combination of both high strength and plasticity that meet the requirements of forgings, can be obtained by annealing at 840 ℃±20 ℃ , then holding for 2 h after reaching that temperature, and air cooling eventually. 2021 Vol. 31 (02): 78-84 [Abstract] ( 1 ) HTML (1 KB)  PDF (5305 KB)  ( 4 ) 85 Research on tool selection of iron based powder metallurgy parts Hot! ZHANG Xiaofen，BAI Yu DOI: 10.13228/j.boyuan.issn1006-6543.20190129 The working surface precision of iron-based powder metallurgy parts after pressing and sintering is difficult to meet the use requirements, so it needs to be machined properly to ensure its accuracy and surface roughness. However, in the process of cutting, it is found that the tool wear is serious and the service life is not high. Frequent tool change affects the production efficiency. In order to select suitable cutting tools for production, the traditional tool testing method based on experience has great defects, high cost and unstable test results, which hinders enterprises from organizing efficient and low-cost production in practice. In order to solve the difficulties of tool selection and application in production, this paper uses deform according to its cutting performance and cutting parameters of turning tools The temperature and wear area of iron-based powder metallurgy parts in the cutting process are analyzed in details by 3D simulation. The wear performance of the tool used is observed in the experiment. The simulation data and experimental results are compared and analyzed to provide practical basis for selecting suitable machining tools. 2021 Vol. 31 (02): 85-91 [Abstract] ( 1 ) HTML (1 KB)  PDF (4807 KB)  ( 4 ) 92 Structure and electromagnetic characteristics of SiC/ r-go composites for radiation-proof exterior walls prepared by hydrothermal method Hot! WANG Hong，SUN Cheng DOI: 10.13228/j.boyuan.issn1006-6543.20200049 A three-dimensional network component (SiC/ r-go) coated with reduced graphene was prepared by hydrothermal process. The better microwave absorption effect could be obtained by using this specific structure.The experimental results showed that the graphite layer formed a larger gap when the hydroxyl group, carboxyl group and other oxygen-containing groups acted on it.The surface of SiC/ r-go formed many folds of r-go, which were characterized by three-dimensional interlacing. The SiC rods form a uniform structure and interweave with each other, forming a layer of coated graphite on the surface. When the temperature rose to 350 ℃, a rapidly decreasing curve was formed, and the r-go in the composite material had decomposed. When the filling proportion increases, a larger part of the complex dielectric constant was formed, and stronger polarization was obtained. The real and imaginary parts of the complex dielectric constant in the frequency range of 2-18 GHz decreased with the increase of the frequency. The application of hydrothermal technology led to the formation of residual functional groups on the surface of r-go nanosheets and many defects. The polarization of space charge occured under the influence of alternating electromagnetic fields, resulting in dielectric loss. 2021 Vol. 31 (02): 92-96 [Abstract] ( 1 ) HTML (1 KB)  PDF (6583 KB)  ( 3 ) 97 Research progress on friction and wear properties of titanium alloys by treatment methods Hot! GUO Xiaoru，CHEN Baiming，JIA Jinlong，HUWei，ZHANG Zhenyu DOI: 10.13228/j.boyuan.issn1006-6543.20200087 Titanium alloy has high specific strength, fatigue strength and corrosion resistance, but its surface hardness and wear resistance are poor, improving its wear resistance has been a research hotspot. The research on improving the wear resistance of titanium alloy can be divided into two methods: surface treatment and integral treatment. Surface treatment is mainly through the formation of a special coating or work hardening layer on the surface of titanium alloy to improve its wear resistance; The overall treatment is mainly through adding or synthesizing ceramic components with high hardness to strengthen the matrix to improve the overall wear resistance of the material. The strengthening mechanism of the two treatment methods is similar to that of titanium alloy, but the overall treatment method has more practical engineering significance for the application of titanium alloy under harsh conditions. 2021 Vol. 31 (02): 97-103 [Abstract] ( 1 ) HTML (1 KB)  PDF (1229 KB)  ( 4 ) 104 Experimental research on iron powder for aluminum alloy additive prepared by converter sludge Hot! SHI Shenghe, ZHU Panxing, YANG Jian, YANG Yu, DUAN Huite DOI: 10.13228/j.boyuan.issn1006-6543.20200215 Aluminum, as the second largest industrial metal after iron and steel, has been widely used. With the continuous development of aluminum alloy industry, the demand for aluminum alloy additive (iron agent) is increasing, and so is the usage of reduced iron powder in aluminum alloy additive (iron agent). Using the existing converter sludge of a steel plantas raw material, through innovative ball milling and reduction process, iron powder for aluminum alloy additive was prepared. The iron powder product highly meets the requirements of aluminum alloy additive (iron agent), which provides a good way for the efficient development and utilization of iron and steelsecondary resources. 2021 Vol. 31 (02): 104-108 [Abstract] ( 2 ) HTML (1 KB)  PDF (1696 KB)  ( 4 ) 109 Study of filtration efficiency in metal fiber felts Hot! CHEN Jinmei，LI Aijun，TAN Ping，PI Yanxia DOI: 10.13228/j.boyuan.issn1006-6543.20200055 Five kinds of 316L stainless steel fiber felts with different pore size were prepared by design, fabrication, sintering and compression. The filtration efficiency was tested respectively according to the standard GB/ T34643 and GB/T18853. The effects of pore size, flow, dust and test fluid on efficiency had been studied. The results show that resistance and filtration efficiency decrease with the increase of pore size. The filtration efficiency reduced when the flow was increased without dust for the same sample, while the filtration efficiency almost unchanged at the same dust feeding per unit time. The filtration efficiency of dusting is 2 to 3 times than that of nondusting for the same particle size when the flow is constant. The filtration efficiency varies greatly in different fluid medias for the same sample, which in air is much higher than in liquid for the same particle size. The filtration efficiency is affected complicatedly by test parameters. It may be determined by the special pore structure of the fiber felts. So it doesn't make sense to talk about filtration efficiency in isolation. 2021 Vol. 31 (02): 109-112 [Abstract] ( 1 ) HTML (1 KB)  PDF (1985 KB)  ( 4 ) 113 Fracture analysis of a tungsten infiltrated copper gas rudder during assembly Hot! LIN Bingtao, LI Hongbo, XIN Feifei, TANG Liangliang, LI Ming, SUN Xiaoxia DOI: 10.13228/j.boyuan.issn1006-6543.20200198 Taking a certain type of tungsten infiltrated copper gas rudder (brand W-7Cu) as the research object, the fracture phenomenon of the product in the assembly process was analyzed. The results show that transgranular fracture is the main fracture mode and intergranular fracture coexists. There is no obvious difference in microstructure between fracture and other parts. Stress concentration is the cause of material fracture. It is suggested to strengthen the protection of connection position or improve the structure to avoid damage caused by stress concentration. 2021 Vol. 31 (02): 113-118 [Abstract] ( 1 ) HTML (1 KB)  PDF (8946 KB)  ( 4 )

Copyright © Editorial Board of Powder Metallurgy Industry Supported by:Beijing Magtech