Tensile Strength of Tungsten Wires vs their Quality

LI Kui-chu

Rare Metals and Cemented Carbides | Vol., Issue 1, 1997 | pp. 38-40

The paper analyses the tensile strength of tungsten wires during processing vstheir guality, and gives suggestions for wire upgrading, such as optimize the annealing conditions, improve the processing technology to control the wire strength d& and so on.

DOI: Cited: 0 Download: 0

Study and Fabrication of D0. 2 mm Straightened Tungsten Wires

SUN Xiao-ping

Rare Metals and Cemented Carbides | Vol., Issue 1, 1997 | pp. 41-44

The straightening mechanism of W wires was explained experimently, andshows that the straightening process is based on elastic-plastic bent deformation. The experimented method can be used for producing special straightened W wiers.

DOI: Cited: 0 Download: 0

Hydroxide Co-precipitation-Spectrophotometry of Total RE in Ion-sorption Type Ores

CHEN Ruo-xian;ZHENG Jian-yu;YANG Jian-mei

Rare Metals and Cemented Carbides | Vol., Issue 1, 1997 | pp. 44-48

The determination method has the following steps: RE hydroxides co-precipitation,while Fe, Al, Ca,etc,are masked; masking the small amount of the co-precipitatedimpurities; developing with arsenazo N at PH 2. 2~3. 01 direct determination with spectrophotometry. The determination range is 0-50μg/mL X 25' Coefficent of variance 2. 2%.Recovery (100±3. 2) %.

DOI: Cited: 0 Download: 0

On the New Product Development and the Technical Management at P/M Factory,CSUT

WU Guo-long;WANG Yang;OU Ying-long

Rare Metals and Cemented Carbides | Vol., Issue 1, 1997 | pp. 48-52

Taking the P/M Factory,CSUY, as an example,the paper indicates that onlycontinuously developing new promising,fruitful and marketable products,and strengtheningtechnical management can made a enterprise prosperous.

DOI: Cited: 0 Download: 0

On the Possible Methods for Separating Mo from W

HUO Guang-sheng;SUN Pei-mei;JIA Gen-gui

Rare Metals and Cemented Carbides | Vol., Issue 1, 1997 | pp. 52-56

The differences in properties of W and Mo compounds are summarized,andtheir possible separation methods are discussed'

DOI: Cited: 0 Download: 0

Production of Tungsten Powder from Blue Tungsten Oxide by H_2 Reduction

HUANG Zhong-geng

Rare Metals and Cemented Carbides | Vol., Issue 1, 1997 | pp. 57-60

The main factors .influencing the size of tungsten powder during its productionfrom blue tungsten oxide by H2 reduction,are presented together with the measures for production of fine tungsten powder.

DOI: Cited: 0 Download: 0

The Influence of Tungsten Electrode Material On Electric Arc Property

ZHANG Wen-lu

Rare Metals and Cemented Carbides | Vol., Issue 1, 1997 | pp. 60-62

The article has introduced the influence of tungsten electrode material on electric arc property,and put forward their improvement (chemical composition,structure,and soon) to meet the property requirements for electric arc.

DOI: Cited: 0 Download: 0

Thermodynamic Behavior of Materials during Crushing and their Influence on Oxygen Content of the Na-reduced Ta Powder

OU Yang-nan

Rare Metals and Cemented Carbides | Vol., Issue 4, 1996 | pp. 1-6

As a matter of record, using the thermodynamic theory ofmaterial crushing, the process of crushing of Ta lump is analysed. Itshoals the etistenc3 a-catty tiings of lit3tantaneous high temperature i'crushing process in open--type e4uipment, which resu its in format ionof Ta oxide and oxynitride .Oxygen enrichment of Ta powder from thisoperation is estimated and discussed. The conclusion is that crushingprocess of the Na--reduced Ta lump is a oxygen enriched one. so w.must give the matter thought.

DOI: Cited: 0 Download: 0

Carbon Removal during Production of K_2 TaF_7from Ti-Sn Slag

LI Ji-hua

Rare Metals and Cemented Carbides | Vol., Issue 4, 1996 | pp. 6-8

The carbon content in K2TaF7 produced from Ti--Sn slagal ways too high. Study was made on filtration of the Ta filtrate priorto cryst allization in a new material--made filter for carbon removal,and satisfaction result was obtained.The carbon content in filtered Taliquid can meet the requirements

DOI: Cited: 0 Download: 0

Coprecipitation Preparation and Characterization of Mixed Rare Earth Oxide Fine Powders

YANG You-ping;HUANG Ke-long;LIU Zhi-guo

Rare Metals and Cemented Carbides | Vol., Issue 4, 1996 | pp. 8-12

Using rare earth oxide(RE 95%)as raw material. mixed rareearth oxide fine powders were prepared by coprecipitation method inwhich urea--aqua ammonia adhere tised to adjtlst the system PH in heatedsolution. The in f luences of preparation condition for products werediscussed init laily. The f me poal-ders were character lied by thermogravimetric, differential thermal analysis, sweep electron microscope,infrared spectrum. The result sho-tvs that mixed rare earth oxide finepowders can be obtained. and under the selected conditions its gra in sizeis about 1 ￣1. 5μm.

DOI: Cited: 0 Download: 0