Electrical Conductivity of NdF_3-NaF-LiF Melt

CHEN Jian-she;XU Xiu-zhi;HUANG Yong-chun

Rare Metals and Cemented Carbides | Vol., Issue 4, 1998 | pp. 28-30

Conductivity of NdF3-NaF-LiF melt is studied by means of threes factor linear orthogonal regression design, and mathematical model about that is presented. Effects of content of NdF3, molar ratio of NaF to LiF, temperature on conductivity are discussed.

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Study of High-efficiency Recovery of Ta from Their Scraps

XU Ling-bin

Rare Metals and Cemented Carbides | Vol., Issue 4, 1998 | pp. 31-35

Study is made of Ta scraps treatment by reducing sintering in combination with pickiling-hydriding-crushing. The results show that metallurgical Ta powder and Ta products can be obtained from Ta scraps with the said process, resulting in remarkable economic profits.

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Preparation Method for Ultrafine Carbide Powder

CHEN Wei-liang;ZHONG Hai-yun;DAI Yong-nian

Rare Metals and Cemented Carbides | Vol., Issue 4, 1998 | pp. 36-41

Several kinds of methods and principles for preparing ultra fine Carbide powder were discussed and compared. It was found that agitation-ball milling is an effective method for preparing ultrafine powder.

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Progress in Purification of Na_2 WO_4 Solution

CAO Shu-hong

Rare Metals and Cemented Carbides | Vol., Issue 4, 1998 | pp. 42-46

The research results of the removal of several common and typical impurities, such as arsenic phosphorus silicon molybdenum etc. from impure sodium tungestate solution are reviewed and several commonly used purification methods are reported with discussion of research trend.

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Research and Development of High-density W-Ni-Fe Alloy

FAN Jing-lian;HUANG Bo-yun;QU Xuan-hui;LI Yi-min

Rare Metals and Cemented Carbides | Vol., Issue 4, 1998 | pp. 47-51

High density alloy used as penetrater is an attracting topic. In this paper, the latest development and research on this kind of enhancing alloy are reviewed in respect of properties,low temperature sintering by lowering temperature, and near net shape, and some problems arealso pointed out.

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A Review of Preparation of <0. 6μm WC Powder

HUANG Zhong-geng

Rare Metals and Cemented Carbides | Vol., Issue 4, 1998 | pp. 51-56

Description is made of the main processes and its recent development for the preparation of <0. 6μm WC powder both at home and abroad. Suggestions are presented on further improvement of the related processes.

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Present Status of Beryllium Production and its Development and Application

LIU Shi-you

Rare Metals and Cemented Carbides | Vol., Issue 4, 1998 | pp. 56-61

The article introduces the distribution of mineral resource and reserve of beryllium and present status of Be production of main manufacturers in the world. It describes in details theapplication and development of Be-metal、Be-Cu、Be-alloys and Be-oxides in all the fields. Finally it analyzes and forecasts the supply and demand of Be up to 2000 year.

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Injection Moulding of Powdered Refractory Metal and Cemented Carbides

HUANG Jin-chang

Rare Metals and Cemented Carbides | Vol., Issue 4, 1998 | pp. 62-64

Description is made of the injection moulding and its application for the powdered refractory metals and cemented carbides.

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The Edition of Internet Homepag

ZHANG Jing-qiu;LIU Sha

Rare Metals and Cemented Carbides | Vol., Issue 4, 1998 | pp. 65-66

The concept of html and their software as well as the edition of internet homepage were introduced in this paper, serving as practical reference for the enterprise on the internet.

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A New Technology for Ammonium Heptamolybdate

ZHOU Chao-hui;HUA Dong-fa;DING Zhi-hu;ZHANG Zhi-jie;ZHAO Ye-song

Rare Metals and Cemented Carbides | Vol., Issue 3, 1998 | pp. 1-4

The solution of acidic ammonium molybdate is precipitated with the hexamine. Its precipitate is employed to generate the ammonium heptamolybdate in basic condition and the hexamine can be completely recovered.

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