Synthesis and Characterization of a Remarkable Ceramic: Ti₃SiC₂

• Michel W. Barsoum

• Tamer El‐Raghy

抄録

Polycrystalline bulk samples of Ti 3 SiC 2 were fabricated by reactively hot‐pressing Ti, graphite, and SiC powders at 40 MPa and 1600°C for 4 h. This compound has remarkable properties. Its compressive strength, measured at room temperature, was 600 MPa, and dropped to 260 MPa at 1300°C in air. Although the room‐temperature failure was brittle, the high‐temperature load‐displacement curve shows significant plastic behavior. The oxidation is parabolic and at 1000° and 1400°C the parabolic rate constants were, respectively, 2 × 10 −8 and 2 × 10 −5 kg 2 ‐m −4 .s −1 . The activation energy for oxidation is thus =300 kJ/mol. The room‐temperature electrical conductivity is 4.5 × 10 6 Ω −1 .m −1 , roughly twice that of pure Ti. The thermal expansion coefficient in the temperature range 25° to 1000°C, the room‐temperature thermal conductivity, and the heat capacity are respectively, 10 × 10 −6 °C −1 , 43 W/(m.K), and 588 J/(kgK). With a hardness of 4 GPa and a Young's modulus of 320 GPa, it is relatively soft, but reasonably stiff. Furthermore, Ti 3 SiC 2 does not appear to be susceptible to thermal shock; quenching from 1400°C into water does not affect the postquench bend strength. As significantly, this compound is as readily machinable as graphite. Scanning electron microscopy of polished and fractured surfaces leaves little doubt as to its layered nature.

収録刊行物

• Journal of the American Ceramic Society

  Journal of the American Ceramic Society 79 (7), 1953-1956, 1996-07

  Wiley

キーワード

• Materials Chemistry
• Ceramics and Composites

詳細情報

• CRID: 1364233269390280832
• NII論文ID: 80009098585
• DOI: 10.1111/j.1151-2916.1996.tb08018.x
• ISSN: 15512916
• ISSN: 00027820
• Web Site: https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1151-2916.1996.tb08018.x
• Web Site: http://onlinelibrary.wiley.com/wol1/doi/10.1111/j.1151-2916.1996.tb08018.x/fullpdf
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