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Densification and Sintering Kinetics of Rare Earth (α′+ β′)-Sialon Composites

Hao WANG , T.S.YEN , Hanrui ZHUANG and Weiying SUN (State Key Lab. on High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai , 200050 , China)

材料科学技术（英）

The sintering processes of Re-(α' + β')-sialon composites (Re=Sm, Dy, Yb) have been investigated by using a specially designed high temperature dilatometer. The initial densification of various samples starts at about 1200℃, and the maximum shrinkage rate of these sialon composites occurs at about 1500℃. The light rare earth sialon has a noticeably tower densification temperature and a higher final shrinkage. The sirtering kinetics of Re-(α' +β')-sialonare much more complex. The Kingery's liquid phase sintering model appears to be applicable,but the mechanism of mass transport in stage two appears to be changeable. The controlling factor shiffs from solution-precipitation to diffusion when densification process proceeds from the earlier part to the later part of this stage.

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Blue-shift of Nano-Y_2O_3 : Eu~(3+) Emission Spectra Excited by X-ray

Qiang LI , Lian GAO , and Dongsheng YAN(State Key Lab. of High Performance Ceramics & Superfine Microstructure , Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , China)

材料科学技术（英）

Nano-Y_2O_3:Eu~(3+) powder was prepared by the homogeneous precipitation. With controlling the conditions of the reaction, nano powders with different grain size were obtained. It is found that the blue-shift phenomena exist in the nano-Y2O3:Eu3+ emission spectra excited by X-ray. The wave lengths of the peak (5D0→7F2) are related with the grain size of the powder

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Preparation and Properties of Nano-TiO_2 Powders

Zhe SONG , Qing LI and Lian GAO(State Key Lab. of High Performance Ceramics & Superfine Microstructure , Shanghai Institute of Ceramics , Chinese Acadmey of Sciences , Shanghai 200050 , China)

材料科学技术（英）

This paper reports the preparation of nano-TiO2 (about 10 nm) powder by the method of precipitation. In detail, some breparation conditions were investigated in order to find out how to control the grain size and reduce the agglomeration of powders. Also, the reflex spectra of nano-scale powders with different grain size were studied. It tvas found that the wave length and width of reflex spectra are connected with the grain size of nano-TiO2 powders

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