Influence of Sintering Aids on Sintering Performance of B_4C/B-Al

WANG Dong-shan;XUE Xiang-xin

Rare Metals and Cemented Carbides | Vol., Issue 1, 2008 | pp. 20-23

The influences of sintering aids Al2O3-Y2O3on sintering performance of B4C/B-Al composites were studied in vacuum carbon tube furnace under argon atmosphere at 1 850 ℃ holding 1.5 h.The results indicated that physical mechanical properties of B4C/B-Al composites are improved through adding Al2O3-Y2O3.Comparing to samples without sintering aids the volume density of the samples increase 26.94%,porosity decreases 32.1%,and compression increases 85.81% averagely.At the same time it was pointed out that the sin...

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Research on Preparation of High-purity Ta/Nb Chlorides

HU Hua-ye;LIU Zhi-qiang

Rare Metals and Cemented Carbides | Vol., Issue 1, 2008 | pp. 24-25

High-purity Ta/Nb chlorides are obtained from Ta/Nb oxides with suitable reductant or directly from Ta/Nb carbides in the enclosed reactor by cloridizing and distillation at controlled temperature.

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Study on the Influence of Steady Electromagnetic Field on Iron Phase of the Casting Eutectic Al-Si Alloy

YOU Jing;WANG Yao-wu;FENG Nai-xiang;YANG Ming-sheng;WU Xiao-lei;DI Yue-zhong;DU Jin-jing

Rare Metals and Cemented Carbides | Vol., Issue 1, 2008 | pp. 26-30

After refined and diluted,Fe is the main impurity in the coarse aluminum-silicon alloy produced by carbothermal reduction.The efficiency of traditional iron removal by filtration with de-ironing additive is low.Study is made on the influence of electromagnetic field on iron-rich phase of the Al-Si alloy with Mn as de-ironing additive.The results showed that the iron phase in the Al-Si alloy grew up from the acicular phase to sheet and spherical phase after treated by steady electromagnetic field.The cubage ...

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The Influence of Different Gas Sources on the Preparation of the Carbon Potential of the Controllable Atmosphere Generator

LI Wei;SHI Zhang-ming;WANG Hong-cai

Rare Metals and Cemented Carbides | Vol., Issue 1, 2008 | pp. 31-33

In view of the influence of the producing gas compositions on the carbon potential,analysis is made of the carbon potential of the endorthermic controllable atmosphere generator with different gas.The results showed the natural gas is better than propane when natural gas or propane is used for controllable atmosphere.

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Impact of Different Pressure on the Properties of Me-DLC

NIE Jun-lan;GU Kun-ming;TANG Jiao-ning;MAI Da-yu;FAN Fan

Rare Metals and Cemented Carbides | Vol., Issue 1, 2008 | pp. 34-37

In the paper is introduced DLC film preparation new method of ECR(electron cyclontron resonance) by microwave plasma gas deposition in combination with magnetron sputtering.Carbon films with Ti/TiN/TiN(N,C)intermediate layer were fabricated on stainless steel substrates by sputtering graphite target and Ti target.Study is made on the influence of the gas flowrate on the film surface morphology,hardness,friction and wearing property and surface energy.

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Research on the Process for Production of High-quality Coarse-Grained WC

LUO Bin-hui;ZHANG Hua-ming

Rare Metals and Cemented Carbides | Vol., Issue 1, 2008 | pp. 38-41

Research is made on the process for production of high-quality coarse-grained WC.Through contrast test,the influence of W powder particle size and addition of active catalyst on WC particle size is analyzed and technologic parameters of production of high-quality coarse grained WC is defined.The actual performance showed that the process can effectively solve the problems outstanding in the traditional process in respect of too much consumption of raw and auxiliary materials and energy and low rate up-to gr...

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Development of ZYS-50/50/130-type Pressure Sintering Furnace

CHEN Yue-hui;GUO Chun;LUO Yi

Rare Metals and Cemented Carbides | Vol., Issue 1, 2008 | pp. 42-45

The important role of pressure sintering furnace in the cemented carbide production and the pressure sintering process is reviewed.The development of ZYS-50/50/130-type pressure sintering furnace is systematically described.And the main performances,technical parameters,safety protection system and actual application results are analyzed and summarized.

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Current and Future Development of Molybdenite Bioleaching Process

CHEN Jia-wu;GAO Cong-jie;ZHANG Qi-xiu;XIAO Lian-sheng;ZHANG Gui-qing

Rare Metals and Cemented Carbides | Vol., Issue 1, 2008 | pp. 46-50

The paper described the latest development both at home and abroad of the molybdenite bioleaching process in respect of the tame of bacteria for leaching,leaching bacteria mechanism and the impact of energy substance as well as culture medium and pulp density on Mo beaching.Some questions are put forward.The future development of the said process is predicted.

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The Present Application and Future Development of Indium

ZHU Xie-bin;DUAN Xue-chen

Rare Metals and Cemented Carbides | Vol., Issue 1, 2008 | pp. 51-55

In the paper is described the reserves,production,price and present applications of Indium is described.And its future development prospect is predicted.

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The Present Application of Rare Earth Yttrium

XIE Jian-chang;LI Quan-an;LI Jian-hong;LI Ke-jie

Rare Metals and Cemented Carbides | Vol., Issue 1, 2008 | pp. 56-58

The applications of Y in related industry are introduced.And the comments are made for reference on the further extension of applications of rare earth Y in the field of infrastructure industry,environmental protection and high-tech industry.

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