期刊
CERAMICS INTERNATIONAL
卷 33, 期 2, 页码 221-226出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2005.09.004
关键词
grain growth; composites; microstructure; Si3N4
The microstructure of hot-pressed h-BN/Si3N4 ceramic composites with Y2O3-Al2O3 sintering additive was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and transmission electron microscopy (TEM). SEM examination shows the diameter and aspect ratio of elongated beta-Si3N4 grains in the composites to decrease with increasing h-BN content. TEM shows some beta-Si3N4 grains in the composites to be unable to develop sufficiently and integrally since h-BN flake limits the growth space for beta-Si3N4 grain and reduces the diffusion rate of Si and N in the liquid glass phase. XRD and TEM reveal that the hot-pressed composites are composed of beta-Si3N4, h-BN, Y2Si3O3N4 and a glassy phase mainly containing Y and Si. The phase composition of the Si3N4 ceramic matrix is unaffected by h-BN addition. (c) 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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