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Investigation on Industrial Information Development

SUN Shi-jie
Rare Metals and Cemented Carbides | Vol., Issue 4, 2001 | pp. 61-64
The paper describes the trend and the development of internet indicating an excellent industry web site will have great promotion to scientific research and production.The establishment of the industrial web site should be done in accurate and dynamatic way for intercommunications so as to become a site where people can not only get information but also can discuss and understand the potential connections between different issues.
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Study on Direct Concentration of Waste Sulfuric Acid from Titanium Oxide Hydrolysis by Vacuum Membrane Distillation

LI Qian;ZHANG Qi-xiu;ZHANG Gui-qing;ZHOU Kang-gen
Rare Metals and Cemented Carbides | Vol., Issue 3, 2001 | pp. 1-5
The paper described the experiment on the upgrading of TiO 2 hydrolysis waste H 2SO 4.The results show that 18% of TiO 2 hydrolysis waste H 2SO 4 is directly upgraded by VMD only up to 31%～32%concentration(mass%),while the pure H 2SO 4 solution of same concentration can be upgraded by VMD up to 65.5%,and VMD process is affected mostly by FeSO 4.
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Study of Microstructures of Steel-bonded Cemented Carbides from Prealloyed Powder

WANG Che;ZHONG Tao-xing;ZHOU Mei-ling
Rare Metals and Cemented Carbides | Vol., Issue 3, 2001 | pp. 6-9
In this paper are analyzed the effects of carbon on microstructures of steel-bonded cemented carbides from prealloyed powder.Formation of WC and compound carbide is described.The results showed that the amount of WC precipitates is dependant on the carbon content,the addition of 0.6% of carbon black can resutlt in microstructure similar to that of the traditional steel-bonded cemented carbide.
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Investigation on Lowering of Fe,Ni and Cr Impurities Content in Na-reduced Ta Powder

LI Shi-lin
Rare Metals and Cemented Carbides | Vol., Issue 3, 2001 | pp. 10-13
Investigation is made on lowering of Fe,Ni and Cr impurities content in K 2TaF 7 and sodium reduced Ta Powder.The results showed the basic way to lower Fe,Ni and Cr content is by reducing the fusion salt corrosion of the reduction equipment Fe;Ni,and Cr content can be distinctly lowered by the selection of proper fusion salt system and composition,the lowering of initial reduction temperature as well as the melting of given amount of sodium and diluent in the reactor followed by addition of K 2TaF 7 for melting.
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Investigation on Expansion Mechanism of Tungsten Alloy

YIN Xiang-chu;XIONG Xiang-jun
Rare Metals and Cemented Carbides | Vol., Issue 3, 2001 | pp. 14-16
Investigation is made on the improvement of the expansion coefficient of W-Ni-Cu alloy.The results showed that the alloys expansion coefficient varies directly as the binding phase (Ni Cu) and basically conforms with the law of addition.The expansion coefficient of the said alloy has been improved from 5.6×10 -6 /K to 8×10 -6 /K on the prerequisite of ensuring good properties of tungsten alloys by controlling the alloy component,optimum technical conditions.
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