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2016 Vol. 26, No. 05
Published: 2016-10-10
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Synthesis and luminescent properties of CaMoO4 : Eu3+, M+(M=Li, Na, K) phosphors
Ca1-1.5xMoO4：xEu3+ and Ca0.5MoO4：0.25Eu3+,M+(M=Li,Na,K) phosphors were prepared successfully via sol-gel method. The crystal structure, particle morphology and luminescent properties of the samples were analyzed. The results showed that samples belong to tetragonal crystal system. The morphology of samples was nearly spherical with size ranging from 2~3μm. The excitation spectras show excitation peaks locate 364nm, 386nm, 396nm, 419nm and 466nm respectively. The strongest excitation peak locates 396nm. The emission spectras of samples exhibit emission peaks locate 596nm, 616nm, 656nm and 704nm individually, characteristic emission peak locate 616nm. When Eu3+ ion doping concentration was 25mol%, the luminescent intensity reaches maximum value. Among Li+, Na+ and K+ introduced as charge compensating agent, the effect of Li+ on the luminescent intensity is the most significant.
2016 Vol. 26 (05): 0-0 [
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Brief introduction to the present situation of atomization powder technology in China
WANG Jian-jun
DOI: 10.13228/j.boyuan.issn1006-6543.20160095
Alloy powder is the basic raw materials for metal injection molding， metal 3D printing， aviation engine and other manufacturing 4.0. The preparation methods mainly include： crushing method， water atomization， gas atomization， water-gas mixture atomization， centrifugal atomization， rotary disk atomization， rotating electrode atomization and ultrasonic atomization. The technical equipment level and the main products and varieties of the atomization powder in China were analyzed， and comparison with foreign advanced technology in the same industry was conducted. The results show that there are a lot of gaps between domestic and foreign in the product variety， average particle size， product yield， stability and consistency of the product， which is the goal and direction of Chinese to pursue.
2016 Vol. 26 (05): 1-4 [
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Effect of braking pressure on friction of copper-based powder metallurgy brake materials
ZENG Xin， LI Feng
DOI: 10.13228/j.boyuan.issn1006-6543.20160014
The tribological properties of copper-based powder metallurgy train brake materials at different brake condition were tested on MM-2000II friction tester. The results show that， the grains have obvious stacking fault stripes when annealed at 900 ℃ for 2 h， which form into a barrier to hinder the dislocation movement and lead to dislocation annihilation difficulty， and make the sub-grain boundaries or grain boundaries increase， grain refinement and materials hardness enhancement. With the increasing of the braking pressure， the friction coefficient increases firstly and then decreases， and has a good stability generally， the wear mass loss increases and turns to be stable gradually.
2016 Vol. 26 (05): 5-10 [
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Process optimization for porous Ti-6Al-7Nb alloy prepared by powder sintering
YANG Hai-li， LIU Hai-peng， TANG Guo-zhang， ZHANG Zhi-tong， MENG Qing-bo
DOI: 10.13228/j.boyuan.issn1006-6543.20150084
Porous Ti-6Al-7Nb alloy was prepared with powder sintering method by taking Ti， Al， and Nb powders as raw material. Effect of mixing time， pressing pressure， sintering temperature and sintering time on porosity was studied through orthogonal experiments. Results show that the sequence of the influence importance of four factors is sintering temperature， sintering time， pressing pressure and mixing time. Considering porosity and pore distribution of materials for orthopedic implantation， the optimal process parameters are set as mixing time of 4 h， pressing pressure of 100 MPa， sintering temperature of 1 100 ℃ and sintering time of 2.5 h. Porosity of porous Ti-6Al-7Nb alloy prepared with the optimal process parameters is 32% and pore size are mainly of 5-12 μm.
2016 Vol. 26 (05): 16-20 [
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Research on the preparation of metal powder for 3D printing
QIN Si-si， YU Yong， ZENG Gui-yu， XIAO Ming-qing
DOI: 10.13228/j.boyuan.issn1006-6543.20150083
According to the situation of 3D printing metal powder materials， the preparation of 304L stainless steel powder used for 3D printing was studied. After changing the atomizing nozzle， it was successfully prepared through gas-atomization. The morphology， particle size distribution and flowability of powder were observed by the scanning electron microscope， laser particle size analyzer and Hall flowmeter， respectively. Results show that the alloy powder with high sphericity degree and narrow particle size distribution is obtained using the double spray nozzle， the average particle size is 40 μm， according with the requirement of 3D printing on metal powder materials.
2016 Vol. 26 (05): 21-24 [
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Determination of gas permeability of porous materials
DONG Ling-feng，， ZHANG Xu， DOU Wei-ying， DAI Chen， ZENG Li-qiong
DOI: 10.13228/j.boyuan.issn1006-6543.20150079
The basic concept， testing principle and testing method of gas permeability were introduced， and the gas permeability under different conditions was measured and analyzed. The influence factors during the testing process were pointed out. It has important significance to the standardization of permeability test of porous materials.
2016 Vol. 26 (05): 25-28 [
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Study on the failure cause of insulation resistance of soft magnetic materials for molded inductors
GUO Feng， LI Wei-jian， YAN Liang-ming， LI Yuan-yuan， WANG Xian
DOI: 10.13228/j.boyuan.issn1006-6543.20150086
The reasons for the change of insulation resistance of molded inductor after low temperature baking were discussed， and the method to improve the insulation resistance was tried to found. It is found that the surface bonding strength between the metal soft magnetic powder and the coating layer increases firstly and then decreases with the increase of temperature， and the coating layer becomes brittle with the increase of temperature. The results show that the reason for the change of insulation resistance is that the volume change of the coating material in the curing process and the change of the surface bonding strength caused by the curing product， and the coating layer is more brittle with the higher curing degree， and the interaction between the two causes the coating layer to produce peeling or even peeling off， which results in the insulation resistance failure after baking.
2016 Vol. 26 (05): 29-32 [
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Study on related parameters of powder metallurgy aluminum foam
WANG Zhan-guang， PENG Kai-qi， WANG Yang
DOI: 10.13228/j.boyuan.issn1006-6543.20150096
Based on the preparation of foamed aluminum by powder metallurgy foaming method， the influence of related parameters on the preparation of foamed aluminum was studied. The results show that， the decomposition peak temperature of TiH2 is 640 ℃， which is close to the melting point of Al. The gas volume of TiH2 decomposition is 30 times higher than that of CaCO3 with same quality. TiH2 is the better foaming agent for fabricating Al foam. The proper foaming temperature for pure Al is 700-750 ℃， and the proper foaming time is 900 s. When the mass fraction of the oxide film is about 9.8%， the porosity reaches the maximum value of 77%， and the pore size is the most uneven when the oxide film mass fraction is 8.2%.
2016 Vol. 26 (05): 33-37 [
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Experimental study on oxygen enriched sintering of iron ore powder
LIU Xiao-wen， HUANG Cong-jun
DOI: 10.13228/j.boyuan.issn1006-6543.20150102
In order to improve the metallurgical properties of sintering ore， experiments of oxygen enriched sintering process of iron ore powder were carried out with different oxygen circulation of 0 m3/h， 6 m3/h， 7 m3/h and 8 m3/h， respectively. Based on the technical parameters， such as exhaust gas temperature， shrinkage percentage and sintering speed， and phase analysis results of sintering ore， the effects of oxygen enrichment on the sinter yield， utilization coefficient， drum strength and particle size distribution of sintering ore were studied. The results show that the overall performance of sintering ore is best when oxygen enrichment is 7 m3/h. Compared with the reference sample， the proportion of needle-like calcium ferrite in the sintering ore is significantly increased， and the sinter yield， drum strength， abrasion resistance index are increased by 12.03%， 0.66 MPa and 1.2%， respectively. In addition， compared with the reference sample， the FeO content in the sintering ore is decreased and there is no obvious influence on the other chemical composition. The oxygen enriched sintering can improve the strength of sintering ore and reduce the coke rate of blast furnace smelting. The experimental study on oxygen enriched sintering of iron ore powder has significance on improving the smelting efficiency and reducing the production costs.
2016 Vol. 26 (05): 38-42 [
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The effect of volume fraction of secondary phase on Ostwald ripening in two phase system
WU Zhi-fang， LIU Chao， ZHOU Fan
DOI: 10.13228/j.boyuan.issn1006-6543.20150089
The effect of volume fraction of secondary phase on Ostwald ripening was overviewed， the Ostwald ripening theories including LSW theory and modern Ostwald ripening theories were also addressed， with focus on the effect of volume fraction of secondary phase on Ostwald ripening.
2016 Vol. 26 (05): 43-47 [
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Research status of SiCp/Al composites prepared by powder metallurgy
ZHU Peng-fei， XIE Jing-pei，， WANG Ai-qin，， LI Jian-yun
DOI: 10.13228/j.boyuan.issn1006-6543.20150103
The preparation process of SiCp/Al composite by powder metallurgy was described in detail， including powder mixing process (such as ball-to-powder?ratio， milling time， milling?speed)， cold compaction(such as compaction pressure， pressure-holding?time， standing time， etc.)， degassing (such as degassing method)， heat densification(such as vacuum hot-pressing， pressureless sintering and hot extrusion， powder hot extrusion)， etc. The effects of reinforcement (SiCp) size and interface on the properties of SiCp/Al composites and the strengthening mechanism of the composites were briefly introduced. Finally the development direction of SiCp/Al composites was forecasted.
2016 Vol. 26 (05): 48-56 [
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Research progress on densification mechanism of powder metallurgy high-velocity compaction
YANG Xia
DOI: 10.13228/j.boyuan.issn1006-6543.20160101
Powder metallurgy parts with high performance can be prepared by powder metallurgy high velocity compaction economically. The density and properties of the parts are close to the powder forging， but the cost is much lower than that of powder forging. In recent years， the powder metallurgy high velocity compaction technology is combined with the technology of die wall lubrication， warm compaction or re-pressing and re-sintering， so that its application field is further broaden. The principle and application， numerical simulation and the research progress of densification mechanism of powder metallurgy high velocity compaction were summarized， and the future research directions were also pointed out.
2016 Vol. 26 (05): 57-61 [
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The application of ELSEVIER database in the field of powder metallurgy literature retrieval
CHEN Chun-lei， XIAO Han， OU Guan-nan， ZHANG Yong-ming
DOI: 10.13228/j.boyuan.issn1006-6543.20150099
In the retrieval of patent application in powder metallurgy field， English non patent search is essential. Based on the characteristics of the powder metallurgy field and ELSEVIER database， the means of obtaining documents using ELSEVIER database which having web publishing date was discussed， and the strategies of searching from Chinese database to ELSEVIER database including inventor tracking， reference documents tracking and invent points retrieval was also studied combined with the actual retrieval case. The combine of various databases can improve the searching efficiency greatly.
2016 Vol. 26 (05): 62-64 [
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Design and application of aluminum powder square cone mixing machine
LU Wen-guang， GU Xiao-feng， ZHAO Hou-lin， ZANG De-geng
DOI: 10.13228/j.boyuan.issn1006-6543.20150066
There are lots of different mixers for powder materials， which have their own mixing features. In the production of modern powder industry， mixer is one of necessary production tools. However， there are few reports on the metal powder mixer， due to the special properties of metal powder， such as aluminum powder， which has small particle size and is easy oxidation， inflammable and explosive. A new type of mixer specially designed for aluminum powder was introduced. The function of the mixer is mainly used for mixing aluminum powder or other metal powder materials. There are two main purposes of mixing， one is for combination uniformity of two or more than two kinds of materials， and the other one is for particle size uniformity of the same material. The main characteristic of the mixer is multi tanks with one machine. It reduces the auxiliary time and can greatly increase the mixing amount per unit time. More importantly， different materials can be loaded into different tanks for mixing operation， which saves the mixing tank cleaning， drying and other processes etc.
2016 Vol. 26 (05): 65-68 [
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Research on NC machining program of the cycloid rotor
QIN Xu-yao， QIN Yin-he， SHAO Hong-zhi， XU Xu-dong， SHEN Xiao-ping
DOI: 10.13228/j.boyuan.issn1006-6543.20150070
Powder metallurgy is the mass production method for cycloid rotor， it is necessary to solve the problem of precision manufacturing for complex cavity mold. The rotor pump working principle， the influence law of parameter change and manufacturing process on tooth profile were studied， and was analyzed through computer programming， thus the influence law of powder metallurgy process on the cycloidal tooth profile was obtained. The rotor cavity precision machining process was designed， eventually the mould was formed， and the rotor was work out.
2016 Vol. 26 (05): 69-76 [
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