Principle and Application of High temperature Oxidation of Metal in the Design of Cemented Carbide Material

ZHANG Li;WU En-xi;HUANG Bo-yun

Rare Metals and Cemented Carbides | Vol., Issue 4, 2000 | pp. 19-22

The principle and application of high temperature oxidation of metal and the composition design of hot rollring cemented carbide have been introduced.It has also been indicated that the rolling performance of cemented carbide can be improved with rare earth addition.

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Approach to Improve the Recovery of Li_2O by Li Mica limestone Sintering Process

SUN You-run

Rare Metals and Cemented Carbides | Vol., Issue 4, 2000 | pp. 23-27

Analysis is made of Li 2O loss distribution and the reasons of metal recovery reduction. Some improvement methods are given.

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Study on the Valence Electron Structure and Properties of TiC_1-x N_x Solid Solution

ZHANG Qiao-xin

Rare Metals and Cemented Carbides | Vol., Issue 4, 2000 | pp. 28-30

The valence electron structure of TiC 1-x N x solid solution is analyzed according to solid and molecule empirical theory.The result shows that the covalence electron number n A in the strongest bond and the hardness in solid solution decrease with the increase of x due to the decrease of n A. It is verified in electron structure level that the stability can be enhanced when partial nitrogen atoms are replaced by carbon atoms in TiN.

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Preliminary Description of the Way to Use the Scientific and Technical Information

ZHAO Qin-sheng

Rare Metals and Cemented Carbides | Vol., Issue 4, 2000 | pp. 31-34

Description is made of the experiences in analyzing and using scientific information for the purpose of importing advanced foreign technologies and know how and for promoting scientific research. Special emphasis was made on some high tech information,especially from Russia,which may be very useful for metallurgical industry and materials science,as well as for environmental protection.

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Synthesis of Superfine Powder by Mechanical Solid-phase Reaction

JIAO Xiao-yan;LI Yong-xiu

Rare Metals and Cemented Carbides | Vol., Issue 4, 2000 | pp. 35-38

The characteristics and preparation methods of superfine powder are introduced briefly.The present development and nature of the low heat solid phase chemical reaction is also discussed.The emphasis is put on the important role and new development of mechanic chemistry and low heat solid-phase reaction in the synthesis of superfine powder.The key points of research work in future are predicted.

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Research on the Friction Properties of Boron Carbide

FANG Shan-feng;WANG Ling-sen;WU Fang

Rare Metals and Cemented Carbides | Vol., Issue 4, 2000 | pp. 39-43

In this article ,the main production methods, the friction properties and the ultra low friction mechanism of boron carbide materials are briefly introduced,The ways to get ultralow friction coefficient are presented,and the exising problems and the forecasting of future is also pointed out.

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MmNi_5 Alloy Material for Metal Hydride Electrodes Produced By Mechanically Alloyed Method

HUANG Jin-chang

Rare Metals and Cemented Carbides | Vol., Issue 4, 2000 | pp. 44-47

The paper summarized the preparation of Nanocrystalline MmNi 5 type alloys by mechanical alloying followed by annealing. The structural and electrochemical properties of these materials have been investigated at room temperatare. For nanocrystalline MmNi 4.2 Al 0.8 alloy discharge capacilies of 207 mA.h/g were obtained.

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The Input Current and Its Harmonics of the General Frequency Inverter

PAN Chen-xiang;JIANG Mai-zhan

Rare Metals and Cemented Carbides | Vol., Issue 4, 2000 | pp. 48-55

This paper describes the influence factors on the input current and its harmonics of VSI inverter,as well as the practical way to control the harmonics.The rodio frequency filtering is also described..

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Improvement of the Power Factor of Transformer Load by Zero passage Periodic Wave Triggering

ZHU Meng-ye

Rare Metals and Cemented Carbides | Vol., Issue 4, 2000 | pp. 56-57

This paper introduces a new way of triggering SCR zero passage periodic wave triggering Its application power control of transformer load, can not only improve the power factor but also avoid direct current magnetizing of transformer..

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Investigation on the General Layout Plan for Technical Improvement Project of W & Mo System in Zhuzhou Cemented Carbide Works

YIN Bi-wen

Rare Metals and Cemented Carbides | Vol., Issue 4, 2000 | pp. 58-61

Analysis is made of the problems arising from the general layout for technical improvement project of W & Mo system in Zhuzhou Cemented Carbide Works. Solutions are also investigated. The recommended plan is checked and approved by the related experts and is accepted by the plant.

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