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The Influence of Doping with Cobalt and Nickel on Gas-sensing Properties of Bismuth Molybdate

HU Xing-ding;ZHANG Wen-pu
Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 17-21
Bismuth molybdate gas sensor materials doped with cobalt and nickel wereprepared respectively' Sintered gas sensors made from bismuth molybdate doped with cobalthave a high sensitivity and selectivity to reducing gases such as ethanol, and insensitivity tobutane and carbon monoxide. The phase composition and structure of these gas sensor materials were investigated by XRD and XPS techniques. The substitutional solid solution formedby cobalt oxide and bismuth molybdate will improve the conductivity and sensitivity of thisgas sensor to reducing gases.
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Effect of Rare Earths on the Microstructure and the Performance of WC-8Co Cemented Carbides

LIANG Fu-qi;HAO Jian-min;HU Ming;YANG Rui;LIU Shou-rong
Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 22-26
The optimizing mechanism for the microstructure and the performance of WC8Co cemented carbides by adding ultrafine mixed powder of rare earths oxidate has been explored. The results show that, the mixed powder of rare earths oxidate can not only fine the WC grain, eliminate the uncontinuous growth WC grain and raise the fee Co-phase content inalloy, but also can evidently raise the macro pressure stress on alloy surface.
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Effects of Intermediate Annealing on Working Quality of W25Re Alloy Wire

TAN Qiang;CHEN De-mao;MENG Xian-zhong
Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 30-33
Stuty was made on effects of annealing variable (temperature, speed, etc. ) ontensile strength,structure and rate of finished products of W25Re alloy wire. Results showthat the use of intermediate annealing can improve the working quality of the wire, increasethe rate of finished products to 60% from alloy blank to D 0.1mm wire, and decrease thewire failure frequency(not more than 3).
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Grasp Massagement, Strengthen Enterprise's Life Force

ZHANG Tong-gui
Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 34-37
Taking the institute as an example, for increasing enterprise's effect, thepaper discusses strengthening enterprise management under the following headings: personnel administration, product quality, new product development, opreation cost and market.Practice indicates that the institute has made a successful reform of above mentioned pointswith a great economic benefit for several succession years.
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Change of China's Tungsten Resource and the Current Decomposing Technology

LI Yun-jiao;CHEN Shi-rui
Rare Metals and Cemented Carbides | Vol., Issue 2, 1997 | pp. 43-48
The change of tungsten resource and the current decomposing technology inour country were summarized in this paper. It was shown that the tungsten resource hasbeen changed structurally in recently. According to this change, it is essential that the current process in our country's tungsten plants must be upgraded with advanced technology.
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