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2019 Vol. 29, No. 01
Published: 2019-02-10
1
Development status of powder metallurgy components industry in China
CAO Yang
DOI: 10.13228/j.boyuan.issn1006-6543.20180150
The development status of powder metallurgy components industry in China and the influence of the automobile industry on the development of PM components industry in China were summarized. The status of PM industry in developed area/country was introduced. The status of PM components industry and its relative industry in China were also introduced briefly. The existing problems and the challenges of PM components industry in China were analyzed.
2019 Vol. 29 (01): 1-5 [
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Study on the dilution characteristics of laser rapid forming AlSi10Mg alloy on titanium substrate
ZHANG Cheng，LIU Yang，MA Yun-zhu，LIU Wen-sheng，LIU Chao
DOI: 10.13228/j.boyuan.issn1006-6543.20170119
In order to ensure that the titanium-aluminum layered composite prepared by laser rapid forming has good metallurgical bonding， the effect of main process parameters on the dilution rate was analyzed. And dilution characteristics such as microstructure evolution， phase composition， and dilution effects on microhardness were studied using EPMA， SEM， OM， XRD and micro-hardness test. The results show that the dilution rate increases with the increase of laser power or scanning speed. The sample with dilution ratio of 76% has smooth surface and no obvious cracks. Dilution causes the convection phenomenon inside the molten pool to make the ingredients tend to be uniform but there is still macro segregation. A large amount of AlTi3， Al3Ti mesophase and Si2Ti， Ti5Si3 ceramic phases are produced via the dilution of the molten pool by melting matrix. The grain refinement caused by the rapid cooling of the laser process and the hard phase produced by dilution significantly increase the microhardness of the molten pool area， where the microhardness is about 5 times the hardness of the matrix.
2019 Vol. 29 (01): 6-12 [
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Study on hot pressing properties of Cu-Sn pre-alloyed powder
YU Qi，MA Jia，ZHONG Su-juan，LONG Wei-min，PAN Jian-jun，YU Xin-quan
DOI: 10.13228/j.boyuan.issn1006-6543.20170106
The FCuSn15 and FCuSn20 prealloyed powders prepared by multi-stage coupling atomization method were used as raw materials for hot pressing under different process conditions. The relative density， Rockwell hardness， three-point bending strength and microstructure of the sintered samples of the two kinds of copper-tin prealloyed powders were analyzed. The results show that， compared with FCuSn15， the density of FCuSn20 sintered sample is slightly lower， Rockwell hardness is increased by about 12%-15%， and three-point bending strength is decreased by 32%-36%. The surface inverse segregation of Cu-Sn prealloyed powder forms liquid phase （α＋δ） eutectoid during sintering， and the powder particles are rearranged to obtain the densest packing and the smallest total pore surface area to promote sintering densification. The FCuSn20 sintered sample has more hard and brittle δ phases， resulting in a decrease in the strength of the sintered sample.
2019 Vol. 29 (01): 13-17 [
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18
Microstructure and performance of diamond-like carbon films fabricated by high power impulse hybrid DC magnetron sputtering
GAO Di，，LIN Song-sheng，XU Wei，，ZOU Jian-peng，YANG Hong-zhi
DOI: 10.13228/j.boyuan.issn1006-6543.20180118
Diamond-like carbon （DLC） films were deposited successfully by high power impulse hybrid DC magnetron sputtering. The orthogonal experiments of changing working air pressure， bias voltage and target voltage were carried out. The microstructure and properties were examined by SEM， nano hardness tester， Raman spectroscopy and 3D contourgraph apparatus. The results show that the thickness of DLC film is about 1 μm and the maximum hardness is up to 24.29 GPa. In Raman spectrum， the G peak and D peak at 1 520-1 540 cm－1 and 1 330-1 370 cm－1 were obtained by peak fitting using Gaussian fitting， respectively. The bias voltage has the most significant effect on thickness， hardness， density and sp3 content， while the target voltage and the air pressure has relatively smaller effect on the microstructure and properties of the films. With the increase of the bias voltage， the thickness and the peak intensity ratio Id/Ig decrease， the hardness and sp3 content increase gradually， and the film microstructure transforms from loose porous columnar structure to dense structure with less pores.
2019 Vol. 29 (01): 18-23 [
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24
Effect of Co content on microstructure and infrared spectrum of nanoparticles ZnFe2O4 for semiconductor
ZHOU Cheng-sheng，CUI Wei
DOI: 10.13228/j.boyuan.issn1006-6543.20180022
The ZnCoxFe2O4 （x＝0，0.25，0.50，0.75） nanoparticles for semiconductor with various Co doping ratios were prepared by hydrothermal method. The effect of Co content on microstructure and infrared spectrum of nanoparticles ZnFe2O4 was studied through XRD， EDS and FTIR. The results show that the diffraction peak of the samples doped with Co ions widens and the crystal quality of the materials is better. With the increasing concentration of Co ions， the diffraction peaks begin to drift toward the lower angle direction. The sample treated with Co doping has larger particle size and higher surface roughness. With the increase of Co doping concentration， the infrared spectrum test results of the samples do not change significantly. After Co ions entering the crystal， the lattice position of Zn ion lattice is replaced， but the lattice structure of ZnFe2O4 is still maintained.
2019 Vol. 29 (01): 24-27 [
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28
Study on microstructure and mechanical properties of powder metallurgy high manganese non-magnetic Fe-25Mn-xCu-C steels
ZHU Quan-li，LIU Yan-xiao，CHEN Jia-jian
DOI: 10.13228/j.boyuan.issn1006-6543.20170093
In order to study the influence of copper content on the microstructure and properties of powder metallurgy high manganese non-magnetic steel， high manganese pre-alloyed powder Fe-25Mn-C and electrolytic copper powder were used to prepare test sample by PM process. The microstructure and tensile properties of the sintered materials were tested. The results show that the microstructure of sintered sample is austenite， copper phase， FeCu4 phase， Fe3Mn7 phase and pores. When the copper content changes from 5% to 20% （mass percent）， with the increase of copper content， the density of high manganese non-magnetic steel increases， while the tensile strength and elongation of the sample first increase and then decrease， both reaching the peak values at 15% copper content， which are 645 MPa and 14.88% respectively.
2019 Vol. 29 (01): 28-31 [
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32
Effect of Cr-Fe type on the friction and wear properties of Cu-based P/M friction materials
LIU Jian-xiu，ZHANG Chi，FAN Jiang-lei，WU Shen，SONG Yang，JIA De-jin
DOI: 10.13228/j.boyuan.issn1006-6543.20170072
Using Cr-Fe hard particles with various carbon contents as friction components， copper-based powder metallurgy friction materials were prepared by powder metallurgy process. The influence of Cr-Fe type on its friction and wear properties was studied. The results show that when the friction velocity increases from 3 000 r/min to 7 000 r/min， the friction coefficients of the four samples increase firstly and then decrease. The friction coefficient of friction material with micro-carbon Cr-Fe as friction component decays severely at high speed， while the friction material with high carbon Cr-Fe as friction component has a stable friction coefficient and little fluctuation during the whole friction process. The wear loss of the four samples increases with the increasing friction velocity. The wear loss of the samples added with micro-carbon Cr-Fe increases sharply under high-speed friction， and the wear resistance is the worst. However， the samples added with high carbon Cr-Fe have the least wear loss and the best wear resistance.
2019 Vol. 29 (01): 32-36 [
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Effect of binder Co and Ni on the microstructure and mechanical properties of Ti（C0.7N0.3）-based cermets
LI Chao，LI Nan，LIU Xue-quan，LIN Fei，LI Fa-chang
DOI: 10.13228/j.boyuan.issn1006-6543.20170109
Ti（C0.7N0.3）-based cermets were prepared by low pressure sintering of powder metallurgy method. The effect of Co/（Co＋Ni） ratio on microstructure and mechanical properties were investigated using SEM， EDS and mechanical properties test instrument. Results show that after sintering at 1 400 ℃ for 1 h， the microstructure of Ti（C0.7N0.3）-based cermets is composed of black core， grey shell and white binder phase. When the total binder is 20% （mass percent） and Co/（Co＋Ni） ratio increases from 0 to 0.6， the bending strength of the cermet gradually increases to the maximum of 2 210 MPa， and then decreases gradually； while the hardness of the cermet reaches the maximum value of 92.1 HRA and then tends to be stable and no longer changes significantly with the increase of Co/（Co＋Ni） ratio.
2019 Vol. 29 (01): 37-41 [
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42
Catalytic effect of Ni component on supported V2O5-WO3/NiO-TiO2 denitration catalysts
ZHAO Meng-meng，CHEN Meng-yin，ZHANG Peng-ju，ZHAO Hui，TANG Fu-shun，RUAN Le
DOI: 10.13228/j.boyuan.issn1006-6543.20170097
NiO components were doped to TiO2 carrier of V2O5-WO3/TiO2 catalysts by co-precipitation and the effect of NiO content on the microstructure， surface properties and SCR performance of the catalyst were investigated. Results show that NiO is incorporated into TiO2 to form NiTiO3， which inhibits the growth of TiO2 grains. The presence of isolated tetrahedron VO4 in Ni3V2O8 reduces the Br?nsted acid content on the catalyst surface， while the interaction between NiOx and VOx reduces the reducibility of the catalyst. The existence of V4+ in Ni3V2O8 is also not conducive to the improvement of catalyst denitration activity. Therefore， NiO doping into V2O5-WO3/TiO2 catalysts by an inappropriate method tends to poison the catalysts.
2019 Vol. 29 (01): 42-49 [
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Effect of warm compaction process on microstructure and magnetic properties of iron-based soft magnetic materials for claw poles
WANG Hong-jian，ZHANG Guang-an，ZHAO Rong-da，JIANG Li-min
DOI: 10.13228/j.boyuan.issn1006-6543.20170118
The iron-based soft magnetic material for claw pole was prepared by powder metallurgy process， and the effects of warm compaction process on its microstructure and magnetic properties were studied by XRD， density， SEM and magnetic properties tests. The results show that the water atomized iron powder compacted under the condition of 140 ℃， 800 MPa has the highest green density of 7.31 g/cm3 and the highest sintered density of 7.42 g/cm3 after 1 250 ℃ sintering in vacuum. The sintered sample has the saturation magnetization of 205.5 Am2/kg and the coercivity of 7.98 A/m. The warm-compacted sample surface is smooth and the porosity is obviously reduced， there is no obvious large-scale connected porosity.
2019 Vol. 29 (01): 50-53 [
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Study on patching technology of bonded NdFeB magnet
XIAO Kai-ye，XU Hai，GUO Zhi-wei，ZHENG Wen，ZHENG Xiao-jing
DOI: 10.13228/j.boyuan.issn1006-6543.20170104
Bonded NdFeB magnets are widely used in various industries due to their excellent magnetic properties and high coercivity. The characteristics of bonded NdFeB magnets formed by die pressing were studied， and a special fixture for bonded magnet processing was designed. Combined with the special negative pressure powder suction device， the problems of chip burning and chuck blockage affecting the machining accuracy in the trimming process were solved. The reasonable cutting tool material and the best cutting parameters were determined， and a set of stable and reliable turning modification process of bonded NdFeB magnet was obtained. The results show that the process is stable， reliable and efficient， which provides a reference for further research on the modification of bonded NdFeB magnets.
2019 Vol. 29 (01): 54-59 [
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Synthesis of nano-CeO2 hollow sphere and its application in dye wastewater treatment
GAO Wei，ZHANG Chun-ying
DOI: 10.13228/j.boyuan.issn1006-6543.20180082
Using Ce（NO3）3·6H2O as Ce source and Na2O2 as oxidant， nano-CeO2 powder was prepared by hydrothermal method. The phase composition and microstructure of the samples were analyzed by XRD and SEM. The results show that with the increase of hydrothermal reaction temperature， the microstructure of CeO2 gradually changes from rod-shaped and small particle structure to hollow sphere， with more uniform and gradually growing particle size， consisting of many small nano-sized particles. The photodegradation rate of CeO2 powder prepared at 120 ℃ for 12 h is about 76.9%， while the powder prepared at 180 ℃ for 12 h has the photodegradation rate of 85.7%， indicating that nano-CeO2 hollow spheres prepared by hydrothermal method have strong adsorption capacity for methylene blue， and powders prepared at higher temperature （180 ℃） have stronger adsorption capacity due to more perfect hollow sphere structure and more uniform particle size.
2019 Vol. 29 (01): 60-62 [
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Research progress of immiscible system bearing alloys with nanocomposite structure prepared by mechanical alloying
WU Zhi-fang，ZHANG Lei，WU Jiang，LIU Chao
DOI: 10.13228/j.boyuan.issn1006-6543.20170096
Nanocomposite structure in immiscible system bearing alloys prepared by mechanical alloying shows different properties compared with micro-scale structure alloys. The research progress of nanocomposite structure in immiscible system bearing alloys prepared by mechanical alloying was reviewed， with focus on the structure and performance requirements of bearing alloys， preparation of mechanical alloying and properties of nanocomposite structure in immiscible system bearing alloy systems.
2019 Vol. 29 (01): 63-68 [
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Research progress in preparation of aluminum nitride by carbothermal reduction nitridation
HOU Hai-lan，FENG Yue-bin，ZI Fu-ting，YANG Bao-min
DOI: 10.13228/j.boyuan.issn1006-6543.20170094
Aluminum nitride ceramics are the ideal substrate materials and electronic packaging materials due to their excellent comprehensive performances in thermal， electrical， optical and mechanical aspects. The carbothermal reduction method is an important commercial production method for AlN powder. The research progresses of AlN powders prepared by the carbothermal reduction method at home and abroad were reviewed from the aspects of process and rection mechanism， and the future research direction was prospected.
2019 Vol. 29 (01): 69-72 [
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Discussion on sinter hardening ability of low pre-alloyed powder
SU Feng-ge，ZHENG Zhuo，WANG Zhi-rong
DOI: 10.13228/j.boyuan.issn1006-6543.20170110
The sinter hardening process of low pre-alloyed powder is a process combining sintering and heat treatment， which can shorten the production cycle and reduce the cost， and at the same time， low alloy can also reduce hardenability. The hardening ability of 1300WA （0.5Mo-1.8Ni） and 5301SH （0.5Ni-0.9Mo-0.38Mn） sintered powders produced by some company， after mixing Cu and C with different contents was studied in the cooling rate range of 0.56-1.94 ℃/s. The results show that the martensite content in the two materials obviously increases with the increase of cooling rate， and the sintering hardening ability obviously increases with the increase of Cu content. When the mass percent of Cu is more than 1.5% and the cooling rate is higher than 1.61 ℃/s， almost full of martensite phase is obtained in 5301SH. However， 1300WA has the similar effect when the Cu mass percent is greater than 2.0% and the cooling rate reaches 1.94 ℃/s.
2019 Vol. 29 (01): 73-79 [
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Research on structural design and simulation of mechanical powder metallurgy press
CHEN Hu，ZHAO Huo-ying
DOI: 10.13228/j.boyuan.issn1006-6543.20170089
As the key equipment for pressing and forming in powder metallurgy production process， powder metallurgy press has become a hotspot research topic in universities， research institutes and production enterprises at home and abroad. Based on the analysis of the product structure and technology research status of mechanical powder metallurgy press at home and abroad， the design and simulation of mechanical powder metallurgy press structure， pressure transmission “crank-pendulum-slider” mechanism， demoulding position constant mechanism， mechanical handicraft action and intelligent control system were carried out. The design of “crank-pendulum-slider” mechanism makes the press more stable movement， vibration reduction， due to the existence of “dwell zone”， which can better ensure the accuracy of the press. The design of the demoulding position constant mechanism can independently control the demoulding action through the drive of the main shaft， so that the demoulding stroke does not need to be readjusted when pressing different products， the operation is convenient， the demoulding position is constant， and the precision of pressed products is high. This design can provide a reference for the design and research of mechanical powder metallurgy press.
2019 Vol. 29 (01): 80-85 [
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