Box-type Vacuum Dryer for Cemented Carbides

YANG Bi-hua

Rare Metals and Cemented Carbides | Vol., Issue 4, 1995 | pp. 33-37

The structure and application of box-type vacuum dryer are described in the paper. The practice shows that the equipment is rather flexible. efficient, and able to ensure the product quality and improve efficiency.

DOI: Cited: 0 Download: 0

Elementary Study of The Relationship Between Production Ability and Engineering Ability

LUO Xin-geng;ZHANG Li-hong;YANG Jun

Rare Metals and Cemented Carbides | Vol., Issue 4, 1995 | pp. 37-39

The qualitative and quantitative analysis is made of therelationship between production ability(M) and engineering ability (Cp).the results show that engineering ability is one of the important factors which effects the production ability.

DOI: Cited: 0 Download: 0

Determination of Major and Minor Elements in Ilmenite by XRF

WANG Zhong-hua;ZHANG Hai-yan;QIU Lin-you

Rare Metals and Cemented Carbides | Vol., Issue 4, 1995 | pp. 40-42

The TiO2, TFe, Al2O3, SiO2, MnO in ilmenite have been measured by XRFA using pelletized powder samples. After separating the calibration curve into two sections or correcting the matrix effects,areasonable accuracy has been obtained. The analysis ranges are as follows: TiO2 7-50%, TFe 20-38%, Al2O3 0.70-30%, SiO2 0. 15-32%,MnO 0. 17-0.80% The results of XRFA agree with those of chemical analysis. The calculations of the equilibrium of metal volume meet the demands of beneficiation. Therefore, this method is an accurate, simple fast and economical one for ilmenite analysis.

DOI: Cited: 0 Download: 0

Study of Determination of Trace Rare Earth by Atomic Absorption Method with Ta-lined Graphite Furnace

YI Jian-ming;YI Xiao-ming;HU Kai-jing

Rare Metals and Cemented Carbides | Vol., Issue 4, 1995 | pp. 43-48

Study is made of Ta lining in the graphite tube for analysis of GSD standard samples by atomic absorption. Results show that thismethod can be used to determinate trace rare earths with high sensitivity,accurate results and long service life of Ta sheet.

DOI: Cited: 0 Download: 0

Reclamation and Application of Cemented Carbides Scrap

ZHANG Qi-xun;ZHANG Jia-xiong

Rare Metals and Cemented Carbides | Vol., Issue 4, 1995 | pp. 48-52

This paper has summerized reclamation and application of cemented carbides scraps. At present there are 3 methods for cemented carbide scrap reclamation : Zinc-fusion method; electric dissolution method; and mechanical pulverization method. The paper has introduced their basic principles. Reclamed WC and Co powders are good in quality and can be used to produce hard alloy or diamond-metal tool material with good results.

DOI: Cited: 0 Download: 0

Ultralight-high Specific Intensity Mg-Li Series Alloy

PENG Zhi-hui

Rare Metals and Cemented Carbides | Vol., Issue 4, 1995 | pp. 53-57

Mg-Li series alloy with- 1. 3g/cm3 density and high specific intensity is very attractive in energy saving for space navigation and automobile industry .The paper summarizes the research results both at home and abroad, and mainly describes the performance of the alloy and influence of the additive elements on alloy structure and mechanical property.

DOI: Cited: 0 Download: 0

The Redraw Process for American 218 Tungsten Wire

LIU Chu-yun

Rare Metals and Cemented Carbides | Vol., Issue 4, 1995 | pp. 57-61

The general description of a redraw process for American famous 218 tungsten wire is given. The quality control during the manufacturing of the fine tungsten wire is discussed.

DOI: Cited: 0 Download: 0

Study of Purity Improvement of Rare Earth Oxide in South Ore Deposit

HE Lun-yan;WANG Shi-nan;ZHOU Xin-mu;JIAO Xiao-yan;WEN Zhi-yu

Rare Metals and Cemented Carbides | Vol., Issue 3, 1995 | pp. 1-5

The technology for purity improvement of composite RE oxides in south ore deposits is studied. Raw material is leached by a selected strong-acid ammonium salt at a control led PH and with addition of ammonium sulfide as purification reagent. Leached solution is pretreatmented with reagent at a proper PH. Pretreatmented solution is subjected to double precipitation first with ammonium bicarbonate and then with oxalic acid to obtain pure RE. Precipitating ratio, PH and amount of ammonium sulfate are important factors to RE purity. Aforesaid method is useful to various solutions.

DOI: Cited: 0 Download: 0

The Effects of Trace Rare Earth Element La,Ce on the Damping Capacity of the Zn-Al Alloy

ZHOU Shan-chu;LUO Bing-hui

Rare Metals and Cemented Carbides | Vol., Issue 3, 1995 | pp. 6-10

The effects of the trace La and Ce on the internal frictionand damping stability of the Zn-Al alloy has been studied in this paper.The experimental results show that adding trace rare earth element La/Ce can improve the damping capacity and damping stability of Zn-22wt%Al alloy.

DOI: Cited: 0 Download: 0

Development of WC Hardening Materials for Undermine Drilling Tools

ZOU Xu-mei

Rare Metals and Cemented Carbides | Vol., Issue 3, 1995 | pp. 11-19

The paper has summerized the development of WC Hardening material for undermine drilling tools since 1970s with reference to some literatures both at home and abroad and on the basis of some tests made by the writer. Detailed analysis is made of the reasons why fissures,peeling-off, and tooth breaking exist in the build-up welding layer of cast WC for hardening material of steel-toothed gear drills. The effectiiveness of new hardening materials such as YM alloy, sintered WC, veneered hard alloy and nodular hard alloy is well demonstrated from various test datum.

DOI: Cited: 0 Download: 0