Measuring of Ni in Mixed Material by Atomic Absorption

ZHANG Li;CHAO Yue-qian

Rare Metals and Cemented Carbides | Vol., Issue 3, 2003 | pp. 15-17

Study is made of the conditions for the determination of Ni in the reclaimed cemented carbide by atomic absorption.The results showed that the use of the operating conditions indicated in the paper can result in the 98%～105% measured recovery and relative inaccuracy ≤17%,the measured results basically conforming to the standard value.When Co content in the mixed material is ≤13%,Co will not interfere with the measurement,as can satisfy the production measurement.

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Applications and Up-to-date Development of Extraction Separation Technology of Cs

HUANG Wan-fu;LI Xin-dong

Rare Metals and Cemented Carbides | Vol., Issue 3, 2003 | pp. 18-20

In the paper is reviewed the applications of Cs in terms of photo-electric effect,energy conversion system, atomic clock, optical science, electronic parts and medicine and up-to-date extraction separation technology. Advantages and disadvantages of the said technology are investigated.

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Progress in the Research of Ti-based Bio-ceramic Preparation by Cathodic Electrodeposition

ZHANG Gang;ZHAO Zhong-wei;HUO Guang-sheng;SUN Zhao-ming

Rare Metals and Cemented Carbides | Vol., Issue 3, 2003 | pp. 21-26

This is a brief review is made on preparation of bioceramic coatings on titanium and/or titanium alloys by cathodic electrodeposition.Some technical parameters are discussed,such as temperature,deposition time,pH of the electrolyte,current density as well as cathodic potential.Ideas are given on the future research.

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Present Status and Prospect of Surface Metallic Coating Technology of Cermet Particles

DONG Zhi-hong;FAN Hong-yuan;LI Wei;SHEN Bao-luo;XIANG Wen-xin;YING Shi-hao

Rare Metals and Cemented Carbides | Vol., Issue 3, 2003 | pp. 27-30

s:The paper has reviewed present status of the surface metal coating technology of cermet particles.Discussions are made on the basic principles,effect and application of various methods.It is pointed out that chemical plating and fluidized- bed CVD are well established now.The future development of the technology is prospected.

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Zr-based Amorphous Alloys and Their Hydrogen Absorption and Desorption Behavior

HUANG Hong

Rare Metals and Cemented Carbides | Vol., Issue 3, 2003 | pp. 31-33

This paper presents Zr-based amorphous alloys and their hydrogen absorption and desorption behavior.

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New Developments and Applications of Tantalum and Tantalum Alloys

HU Zhong-wu;LI Zhong-kui;ZHANG Ting-jie;ZHANG Xiao-ming

Rare Metals and Cemented Carbides | Vol., Issue 3, 2003 | pp. 34-36

The paper has reviewed the new developments and applications of tantalum and tantalum alloys in recent years, in respect of electronic industry,high-temperature alloys,weapon system,corrosion-resistant alloy and cladding material.It is pointed out that there will be large increase of Ta demand and sustained development of Ta application range.

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Development of W Ion-exchange New Technology

HUANG Cheng-tong

Rare Metals and Cemented Carbides | Vol., Issue 3, 2003 | pp. 37-41

W ion exchange new technology is based on the different absorption power of strongly basic-anion exchange resin for different ions in the sodium tungstate and based on the characteristics that the ions with high affinity can be replaced by distinct increase of concentration of ions with low affinity for resin for the purpose of impurity separation and W purification.Through over 20 years of continuous improvement,this technology has become a perfect ion exchange technology for W.

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Influence Factors and Improvement of Low-temperature Ductility of Doped Tungsten Wire

FAN Jun-xian

Rare Metals and Cemented Carbides | Vol., Issue 3, 2003 | pp. 42-44

Analysis is made of the influence factors of the tunsten wire low-temperatare ductility in respect of the raw matcrial purity,additive content and technological conditions,Corresponding improvement measures are presented.

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Integral Vacuum Sintering Furnace Manufactuved by Xiangtan Xinda P/M Equipment Manufacturing Company Ltd

MA Guang-di;LI Ying-xin

Rare Metals and Cemented Carbides | Vol., Issue 3, 2003 | pp. 45-48

Brief description is made of the structure,de-waxing system,process gas injection system,control system as well as performance assessment results of the integral vacuum sintering furnace manufactured by Xiangtan Xinda P/M Equipment Manufacturing Company Ltd.

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Production of Tungsten Carbide by Thermo-reduction of Tungsten Concentraes

ZHAO Qin-sheng

Rare Metals and Cemented Carbides | Vol., Issue 3, 2003 | pp. 49-50

A high quality tungsten carbide production technique by alumintherm reduction of tungsten concentrates was recommended.The tungsten carbide produced satisfied the requirements of Russian technical standard and can be used for manufacturing drilling instruments and hard metals.

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