Microstructural-property correlation of CVI processed C_f/SiC composites and property enhancement as a function of CVD SiC seal coating

详细信息    查看全文

• 作者：Sarabjit Singh ; ^{sarabjit@dmrl.drdo.in" class="auth_mail" title="E-mail the corresponding author} ; ^{sarabdrdo@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Vajinder Singh ; Sweety Kumari ; A. Udayakumar¹ ; V.V. Bhanu Prasad
• 关键词：B. Composites ; C. Thermal expansion ; B. Electron microscopy ; D. Carbon
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：14896-14907
• 全文大小：5102 K

文摘

Carbon fiber reinforced silicon carbide composites were prepared by an isothermal chemical vapour infiltration (ICVI) process. The test samples were seal coated by SiC by the chemical vapour deposition process. The nature of pyrocarbon coating (as an interphase) was studied before the infiltration of SiC matrix by a CVI process. The effect of protective SiC seal coating was examined by testing the uncoated and the seal coated samples for flexural properties, coefficient of thermal expansion (CTE) and pore size distribution. The microstructure-property correlation of the flexural test samples showed that the seal coating protected the carbon fibers from oxidation, which resulted in the significant improvement in the flexural strength value at the test temperatures as compared to the uncoated samples. Relatively lesser value of the coefficient of thermal expansion was observed for the seal coated sample.