Processing and characterization of Cf/ZrB2-SiC-ZrC composites produced at moderate pressure and temperature
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- 作者：Rajaguru Kannan ; Lingappa Rangaraj ; ranga@nal.res.in
- 关键词：Carbon-fibre ; ZrB2 ; Hot pressing ; Infiltration ; Mechanical properties ; Oxyacetylene
- 刊名：Ceramics International
- 出版年：2017
- 出版时间：1 February 2017
- 年：2017
- 卷：43
- 期：2
- 页码：2625-2631
- 全文大小：3119 K
- 卷排序：43
文摘
Cf/ZrB2-SiC/ZrC composites were prepared by hot pressing of carbon fibre (Cf) cloth, ZrB2, polycarbosilane (PCS) and Zr metal at 4 MPa and 1200 °C. The bulk density of Cf/ZrB2-SiC/ZrC composite was improved from 2.29 g/cc to 2.69 g/cc as a function of PCS infiltration cycles. Microstructural investigation revealed that the SiC encapsulates the Cf and also present at grain boundaries. This resulted in enhanced scratch critical load from 1500 to 3200 mN and flexural strength from 30 to 100 MPa. Further, oxyacetylene flame at 2100 °C for a shorter duration of 20–60 s showed a decrease in the mass ablation rate from 0.0062 to 0.0028 g/s. This was due to the formation of protective Zr-Si-O layer and confirmed by elemental analysis.