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Application of Warm Compaction in the Nonferrous-based P/M Materials

Rare Metals and Cemented Carbides | Vol., Issue 3, 2007 | pp. 49-53
The paper describes the increasing applications of warm compaction in nonferrous-based material industry with the successful performance of ferrous-based P/M warm compaciton technique. It is pointed out that warm compaction can effectively improve the density of the carbide/Ti alloy/magnetic material and out that W-basec compact of plasti compaction can effectively improve the density of the carbide/Ti alloy/magnetic material and powder green compacts. Rational design of lubricants /binders can assure excellent warm iciency. The results showed that warm compaction is more advantageous in the preparation 1-based composite material, viscous magnetic material and polymer-based composite material.And fluid warm compaction process, developed from the conventional warm compaction is expected to have wide application in future because it can compact complex components.
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The Measures of Lowing Residual Stress from Metal-Ceramic Field Diffusion Bonding

Rare Metals and Cemented Carbides | Vol., Issue 3, 2007 | pp. 58-60
This paper describes the mechanism, characteristics and applications of field diffusion connection. It is pointed out that the presence of residual stress can affect the bonding quality. Based on the analysis on how the residual stress is generated from metal-ceramic filed diffusion bonding,detailed measures are given to lower the influence.
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Research on Effects of Dy(Ac)_3 doping on Dielectric Properties of BaTiO_3 Ceramics

Rare Metals and Cemented Carbides | Vol., Issue 2, 2007 | pp. 1-4
Barium titanate powder was prepared by hydrothermal method, doped with Dy(Ac)3, and then the ceramic was obtained. The effects of soluble Dy(Ac)3 doping on the dielectric properties of BaTiO3 powder were studied, and the law of the influence on the BT series capacitor ceramics has been obtained, i. e. with the increasing of Dy(Ac)3 additive, the dielectric constant (εr) of materials starts increasing and then decreasing while the dielectric losses (tanS) decreasing and the dielectric constant (εr) is maximum while ωDy(Ac)3 =0. 8%. The BT ceramics with optimum comprehensive properties have been obtained with high εr (= 5 672) ,low tanS( =0. 0024) and high DC breakdown voltage(=6 kV/mm). The influence mechanism of Dy(Ac)3 on the dielectric properties of BaTiO3ceramics is studied,thus providing the basis for prepara- tion of capacitor ceramics.
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Preparation of Al-Sc Intermediate Alloy by Alumino-thermic Reduction of Sc_2O_3

Rare Metals and Cemented Carbides | Vol., Issue 2, 2007 | pp. 5-7
Al-Sc intermediate alloy is prepared by alumino-thermic reduction. The test results showed that the addition of appropriate amount of ScF3 into nNaF · AlF3-KCl-NaCl molten salt can improve Sc2O3 solubility;the use of liquid A1 as reductant for the preparation of Al-Sc intermediate alloy can increase Sc content (assaying 2% mass)and Sc recovery as well as improve the quality of the intermediate alloy and reduce the operating cost,as can facilitate the further application of Al-Sc intermediate alloy.
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Preparation and Characterization of Ce0.8Sm0.1Gd0.1O1.9 Electrolyte

Rare Metals and Cemented Carbides | Vol., Issue 2, 2007 | pp. 11-13
Sm and Gd co-doped CeO2 electrolyte powders were prepared by co-precipitation. The phase composition,morphology and particle size of the powders were characterized. At the same time, the properties of the sintered SGC materials were also characterized. The results showed that the SGC electrolyticpowder prepared by the co-precipitation had good sintering characteristic with relative density〉93% when sintering at 1 400℃. The electrical :property testing also showed that the sintered SGC materials had the higher oxygen ion electrical conductivity at medium-temperature.
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