TiN modified SiC with enhanced strength and electrical properties
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- 作者：Zachary N. Wing zwing@acmtucson.com
- 关键词：Silicon carbide ; Titanium nitride ; Conductive ceramics ; Ceramic composites ; High strength SiC
- 刊名：Journal of the European Ceramic Society
- 出版年：2017
- 出版时间：April 2017
- 年：2017
- 卷：37
- 期：4
- 页码：1373-1378
- 全文大小：1041 K
- 卷排序：37
文摘
SiC based composites were manufactured with varying TiN content (0–50 V%) using Al2O3 and Y2O3 sintering aids. Basic dilatometry measurements were performed to determine when densification begins within the composite system. Samples were consolidated via uni-axial hot pressing at 1900 °C to produce ceramic composites with >98% theoretical density. Electrical measurements show increasing TiN additions reduce resistivity and begin to plateau at 40–50V%. Resistivity decreased from 2.0 × 105 Ω − cm (0% TiN) to 2.0 × 10−4 Ω − cm (50V% TiN). Flexural strengths were characterized and compared against a baseline (0% TiN) SiC. Strengths increased gradually with TiN content. A maximum strength 921 MPa was observed at 40V% TiN content vs. 616 MPa for the baseline SiC. This was a gain of 50% over baseline. Additions beyond that range did not produce further gains in strength.