Publication Date:
2013-10-22
Description:
Porous Si 3 N 4 /SiC ceramics with high porosity were prepared via nitridation of Si powder, using SiC as the second phase and Y 2 O 3 as sintering additive. With increasing SiC addition, porous Si 3 N 4 /SiC ceramics showed high porosity, low flexural strength, and decreased grain size. However, the sample with 20wt% SiC addition showed highest flexural strength and lowest porosity. Porous Si 3 N 4 /SiC ceramics with a porosity of 36–45% and a flexural strength of 107-46MPa were obtained. The linear shrinkage of all porous Si 3 N 4 /SiC ceramics is below 0.42%. This study reveals that the nitridation route is a promising way to prepare porous Si 3 N 4 /SiC ceramics with favorable flexural strength, high porosity, and low linear shrinkage.
Print ISSN:
1546-542X
Electronic ISSN:
1744-7402
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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