Study on Valent Electron Structure of (Ti、W) (C、N)

ZHANG Qiao-xin

Rare Metals and Cemented Carbides | Vol., Issue 1, 2001 | pp. 5-7

The valent electron structute of (Ti、W)(C、N)solid solution has been analyzed according to the classical electron theory of solid and molecule.The result shows that the covalent electron number n A in the strongest bond of (Ti、W)(C、N)solid solution decreases with the increase of W or N.Some properties of (Ti、W)(C、N)has been analyzed based on this result.

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Study on Ni-based Alloy Aluminization Mechanism

YAN Jian-hui;CHEN Guo-bin;LU Jian-hong

Rare Metals and Cemented Carbides | Vol., Issue 1, 2001 | pp. 8-11

Study is made on the formation of me chanism of Ni based alloy aluminization,whichisthonght to be made up of four steps to be controlled mostly by solid Phase diffusion.The diffusion speed is mainly depended on the aluminization temperature,then aluminization time.In addition,different aluminization temperature will result in different generation speed of phases with different activitation energy.

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Study of Decomposition of Enriched Ta-bearing Alkaline Metals

ZHONG Yue-lian

Rare Metals and Cemented Carbides | Vol., Issue 1, 2001 | pp. 12-14

Analysis is made of the influence of alkali metals K and Na on the decomposition ratio of enriched Ta.The decomposition ratio can be improved from 92% to ≥99% by the adoption of precipitation conversion theory and proper addition of quartz powder as conversion agent without heating throughout the process.

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Study on Boron-zirconizing Urging by Rare Earth Elements

DU Xiao-dong

Rare Metals and Cemented Carbides | Vol., Issue 1, 2001 | pp. 15-17

A new kind of boriding agent has been adopted by boriding to GCr15 cold worked die in this test,the boriding process by this boriding agent were studied. The results showed that the boriding layer is even,and has less brittleness.By 890 ℃×6 h boriding process,this temperture is much lower than usual boriding temperture.A relatively ideal boriding layer can be obtained.

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Investigation on Microstructure of Steel-bonded Molten Cemented Carbides

WANG Che;ZHONG Tao-xing;ZHOU Mei-ling

Rare Metals and Cemented Carbides | Vol., Issue 1, 2001 | pp. 18-23

Analysis is made of the structure of WC based steel bonded molten and annealed cemented carbides and study was made of the influence of different carbon addition on the structure,The results showed that WC is not present in the structure of molten steel bonded cemented carbide.Proper increase of carbon or WC content and annealing will help improve the improper structures and WC reduction.

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Study of Process Optimization for WC Production from Alloy Scraps

ZOU Xu-mei

Rare Metals and Cemented Carbides | Vol., Issue 1, 2001 | pp. 24-27

Comparision is made between the characteristics of recovered WC and conventional WC by clectronic probe detection.In view of perfect crystal lization,less defect in the crystal and sufficient compound carbon,cemented carbide superior to conventional WC is developed by process optimization to compensate for the high O 2 content and more inclusions in the recovered WC.

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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 1, 2001 | pp. 28-32

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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The Preparation and Development of Nanometer TiO_2 Particles

YANG Xiang-ping;DUAN Xue-chen;ZHOU Jian

Rare Metals and Cemented Carbides | Vol., Issue 1, 2001 | pp. 33-35

This paper mainly introduces the preparation of nanometer titanium dioxide.On the basis of summary and induction all methods are compared and their advantages.disadvantages and application scope are indicated.Meanwhile the development is also introduced.

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New Technology for Ni-Si Fine Powder Preparation

HUANG Hong;HUANG Jin-chang

Rare Metals and Cemented Carbides | Vol., Issue 1, 2001 | pp. 36-39

Afrer arc melting,Nb Si alloy containing70%～85% Nb (atom fraction) is hydrided directly in arc melting chamber without activation to obtain fine Nb Si powder by pulverization.

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Comments on Improving the Technical Level of Molybdenium Metallurgical and Processing Industries in China

LI Qing-kui

Rare Metals and Cemented Carbides | Vol., Issue 1, 2001 | pp. 40-41

Based on the analysis of technical level of Mo metallurgy and processing industry,suggestions are given on the basic research items and the popularization and future application.

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