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2015 Vol. 25, No. 05
Published: 2015-10-10
1
An introduction to metal iniection moulding (MIM) process and applications
R M German
DOI: 10.13228/j.boyuan.issn1006-6543.20140077
Powder injection moulding (PIM), which encompasses metal injection moulding (MIM) and ceramic injection moulding (CIM), is a major manufacturing technology with sales of more than $1.5 billion in 2010. MIM markets, the history of the technology, how the process works, what materials can be processed were introduced, and a selection of case studies from around the world was also described.
2015 Vol. 25 (05): 1-12 [
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Mechanical alloying of Ag-Cu nanocrystalline supersaturated solid solution
WU Zhi-fang, , ZHOU Fan, , CHENG Zhao,
DOI: 10.13228/j.boyuan.issn1006-6543.20150004
The thermodynamics model of Ag-Cu system in mechanical alloying (MA) process was established based on Miedema semi-experimental theory. The calculation result shows that there is no thermodynamics driving force to form solid solution. While the X-ray diffraction (XRD) result shows that Ag-20%Cu (atom percent) nanocrystalline supersaturated solid solution can be prepared by mechanical alloying. The driving force of Ag-Cu supersaturated solid solution prepared by mechanical alloying comes from kinetics driving force. In the subsequent annealing process, the nanocrystalline supersaturated solid solution decomposes.
2015 Vol. 25 (05): 13-16 [
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Effect of atomizing chamber pressure on the atomization process of Sn0.3Ag0.7Cu solder powder
WANG Zi-yu, ZHAO Mai-qun, HAN Shuai, WU Dao-zi, ZHAO Zhen
DOI: 10.13228/j.boyuan.issn1006-6543.20140071
The Sn0.3Ag0.7Cu lead-free solder powder was prepared with supersonic gas atomization device to study the effects of different pressure states inside the atomization chamber on the atomization process of powder. The results show that conical atomization area tends to disorder from stable state with the atomizing chamber pressure increasing, moreover, the conical atomization area becomes larger gradually, gas-liquid flow ratio also increases, and the sphericity degree of atomized powder becomes better firstly and then worse. When the pressure inside the chamber is 0.05 MPa, the conical atomization area is stable and has large area, the sphericity degree of atomized powder is the best.
2015 Vol. 25 (05): 17-21 [
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22
The technology study of voluminal reduction on chromite ore fines containing silicon heated by microwave
WU Kui-lin,,, LI Lei ,,, ZHU Hong-bo,,, PENG Jin-hui,,,ZHANG Li-bo,,, DAI Lin-qing,,
DOI: 10.13228/j.boyuan.issn1006-6543.20140079
Influence of various smelting temperature, holding time and end-point temperature on the conglomeration, growing and separation of the Cr-Fe alloy during voluminal reduction on chromite ore fines containing silicon heated by microwave was studied. The chemical composition of reduction products Cr-Fe alloy was also analyzed. The results show that the reduction product Cr-Fe alloy conglomerates to block and separates from slags preferably at smelting temperature of 1 300 ℃, holding time of 40 minutes and end-point temperature of 1 450 ℃. The composition of reduction products Cr-Fe alloy meets requirements of (GB5683-87) FeCr55C25II.
2015 Vol. 25 (05): 22-25 [
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Molten salt method to synthesize Cr2AlC ceramic powder
FU Zheng-hong, LEI Yu, LIU Jin-yun, LU Yun, JIN Ying-rong, WANG Min
DOI: 10.13228/j.boyuan.issn1006-6543.20140099
The Cr2AlC ceramic powder was synthesized by using the molten salt method in carbothermal reduction atmosphere. The orthogonal experiments were designed to investigate the effects of cosolvent dosage, synthesis temperature, raw material ratio and holding time on the productivity of Cr2AlC powder. The optimal synthesis parameters were achieved and then be verified. The results show that synthesis temperature is the most principal factor, then is the cosolvent dosage and holding time, raw material ratio is the last one. The carbothermal reduction atmosphere has the same function of preventing raw material from oxidization with argon atmosphere.
2015 Vol. 25 (05): 26-30 [
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31
Study on expansion and influence factors of diffusion CuSn10 powder compacts during sintering
XU Jing-jie,,, MA Fei, ZHANG Xi-chao,,, WANG Li-min,,, MU Yan-ru,,, LIU Yi-lang,,
DOI: 10.13228/j.boyuan.issn1006-6543.20150049
Four groups of partial alloyed CuSn10 powders were prepared though diffusion technique with atomized copper and tin powder as material, and then the powder were pressed and sintered. The reason of expansion and influence of powder particle size for the sintered compacts were studied. The results show that four groups of compacts all expand. The main reasons are: Atomized powder has near spherical shape, which contributes to less porosity; The Sn-rich area turns into liquid phase after Sn melting, and diffuses to the inside of copper particle, as a result, copper lattice grows up and vacancy forms at the original place of tin; Liquid tin fills into the gap of copper powders; The air pressure existing in the inclosed holes increases with the sintering temperature increasing, which causes to volume expansion. The expansion rate of CuSn10 increases with the raw material particle size increasing. The effect of Sn on the expansion rate of the CuSn10 is about three times that of Cu powder.
2015 Vol. 25 (05): 31-35 [
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36
The modified catalytic debinding binder and its application research
XU Xiao-ming, LI Du-xin, WU Wei, YANG Zhong-chen
DOI: 10.13228/j.boyuan.issn1006-6543.20140093
A modified catalytic debinding binder was developed and applied to the iron-based porous materials injection molding. The results show that feedstock of the binder exhibites pseudoplastic and good rheological properties, while the non-newton index[n]and the viscous flow activation energy[E]are 0.378 and 40.89 kJ/mol respectively at 180 ℃, 1 961 s－1 shear rate. Using HNO3 as catalyst, catalytic degreasing rate is quick and up to 1 mm/h, and the debinding rate reaches 85.6% after catalytic debinding for 5 h. The porous materials prepared by powder injection molding method show uniform pores distribution. Besides, the tensile strength of the porous materials is 460.68 MPa while the opening porosity is 19.44%.
2015 Vol. 25 (05): 36-41 [
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42
Study on the properties of 2A12 aluminum alloy powder prepared by hot isostatic pressing
YU Si, LANG Li-hui, WANG Gang, HUANG Xi-na, XU Qiu-yu
DOI: 10.13228/j.boyuan.issn1006-6543.20140103
The 2A12 aluminum alloy powder specimens were prepared by hot isostatic pressing with a square canning. The deformation of canning, mechanical properties and fracture morphology of 2A12 aluminum alloy powder specimens were studied. Results show that mechanical properties of the specimens are lower than those of forged samples, the fracture mechanism is brittle fracture; the surface oxides inhibit the diffusion bonding among the powder particles; and the bonding strength in the powder interface is low, thus the samples are fractured from the interface.
2015 Vol. 25 (05): 42-46 [
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Effect of aging temperature on PPB and mechanical properties of PM FGH96 alloy
ZHAO Jian-qing, LIU Jing, ZHANG Yin-dong, FU Su-zhen
DOI: 10.13228/j.boyuan.issn1006-6543.20150042
The powder metallurgy FGH96 alloy was prepared by plasma rotating electrode process (PREP) and hot isostatic pressing (HIP). Effects of aging temperature on microstructure and mechanical properties of FGH96 alloy were studied. The results show that the grain size and twin crystal of FGH96 alloy have no obvious change, while the prior particle boundary (PPB) increases obviously with the increase of aging temperature. The tensile strength and yield strength of the alloy decrease, while the elongation, shrinkage and creep elongation increase with the increase of aging temperature. The morphology of cracking along the powder particles in the tensile fracture increases with aging temperature increasing.
2015 Vol. 25 (05): 47-51 [
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Effect of NbC content on the microstructure and mechanical properties of Mo2FeB2 based cermets
ZHANG Zhi-wei, CONG Shan-hai, HU Mei
DOI: 10.13228/j.boyuan.issn1006-6543.20140100
Mo2FeB2 based cermets with various NbC contents were prepared by the method of in situ reaction and vacuum sintering. Microstructure and mechanical properties of the samples were also studied. Results show that the hard phase is refined and uniformly distributed in the binder phase, and the hardness and wear resistance of the samples increase firstly and then decrease with the NbC content increasing. The sample has the highest hardness and best wear resistance when the mass percent of NbC is 6.0%.
2015 Vol. 25 (05): 52-55 [
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Study on density and microstructure uniformity of 97WNiFe oversized parts
WANG Ling, LIU Gui-rong, PEI Yan-bin
DOI: 10.13228/j.boyuan.issn1006-6543.20150002
With fine tungsten powder, electrolytic nickel powder and carbonyl iron powder as raw material, the oversized parts 97W2Ni1Fe alloy was prepared by liquid phase sintering. The weight of 97W2Ni1Fe oversized parts was 66 kg and the size was [?]120 mm×320 mm. The oversized part was cut into 52 parts, and then densities and microstructure of the 52 parts were measured and analyzed, respectively, to study the density and microstructure uniformity. Results show that the density and microstructure of the oversized tungsten alloy have regular distribution. Because of time effect of heat conduction during sintering, the density and tungsten particle size both decrease gradually from surface to the interior of the workpieces.
2015 Vol. 25 (05): 56-59 [
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Research progress and application of?diamond-like carbon coating
ZHANG Er-geng, CHEN Qiang
DOI: 10.13228/j.boyuan.issn1006-6543.20150007
Diamond-like carbon（DLC）coating has excellent antifriction and wear resistance, which has become a hot spot of current research. Due to the effect of substrate material composition, as well as the difference between DLC coating material properties and substrate material properties, the DLC coating has large internal stress, leading to bad bonding between the coating and substrate. Adding a transition layer, doping the third element and preparing multilayer structure coating are effective ways to improve the interface bonding strength and thermal stability. The properties, preparation techniques of DLC coating, as well as its application in metal processing, automotive, medical equipment, aerospace and other fields were introduced, the application prospect and development tendency of DLC coating were also proposed.
2015 Vol. 25 (05): 60-65 [
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Research progress on the sintering technology and properties of fine-grained Ti(C,N) cermets
WANG Hong-tao, LI Hong
DOI: 10.13228/j.boyuan.issn1006-6543.20150013
The research results of fine-grained Ti(C,N) cermets sintering technology were summarized. The effects of different sintering methods on the microstructure and properties of Ti(C,N) cermets were analyzed briefly. The technical characteristics were summarized, and the development trend of fine-grained Ti(C,N) cermets was also discussed.
2015 Vol. 25 (05): 66-70 [
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Experimental study on the fine iron powder modified produced by sludge iron powder
XIAN Zhong-ju
DOI: 10.13228/j.boyuan.issn1006-6543.20140065
The iron powder extracted from the converter steelmaking dust, namely sludge iron powder, was sieved through 150 μm (100 mesh) screen mesh. The screen powder nears to globular with total iron grade more than 80.00% (mass percent). Three kinds of modification methods were used to change the powder particles into irregular shape, and then the modified powder was reduced and broken. The fine iron powder which meets the requirements of diamond matrix was then achieved. Among the modification methods, the physical method has short process, low cost and obvious effect.
2015 Vol. 25 (05): 71-75 [
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