COLLOIDAL PROCESSING AND MECHANICAL-PROPERTIES OF WHISKER-REINFORCED MULLITE MATRIX COMPOSITES

被引:38
作者
HIRATA, Y [1 ]
MATSUSHITA, S [1 ]
ISHIHARA, Y [1 ]
KATSUKI, H [1 ]
机构
[1] SAGA PREFECTURAL GOVT,CERAM IND RES INST,SAGA 844,JAPAN
关键词
D O I
10.1111/j.1151-2916.1991.tb06781.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Aqueous colloidal suspensions in the two systems of CVD-processed ultrafine mullite powder (< 0.1-mu-m), -Si3N4 whisker and -mullite whisker, were prepared near the isoelectric point of mullite (pH 7.0) to prevent cracking during drying of wet green compacts consolidated by filtration. The freeze-dried porous green compacts were hot-pressed with a carbon die at 1500-degrees-C for 1 h at a pressure of 39 MPa in N2 atmosphere. The relative densities of the mullite matrix composites with whiskers of 0 to 10 vol% were in the range of 95.2% to 99.8%. Increasing the fraction of Si3N4 whisker increased the density, flexural strength, and fracture toughness of the hot-pressed composites. On the other hand, addition of the mullite whisker increased the fracture toughness but decreased the density and strength of the composites.
引用
收藏
页码:2438 / 2442
页数:5
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