Member, American Ceramic Society.
Synthesis and Characterization of a Remarkable Ceramic: Ti3SiC2
Article first published online: 21 APR 2005
Journal of the American Ceramic Society
Volume 79, Issue 7, pages 1953–1956, July 1996
How to Cite
Barsoum, M. W. and El-Raghy, T. (1996), Synthesis and Characterization of a Remarkable Ceramic: Ti3SiC2. Journal of the American Ceramic Society, 79: 1953–1956. doi: 10.1111/j.1151-2916.1996.tb08018.x
P. W. Brown—contributing editor
Supported by the Mechanical and Structural Systems Division, National Science Foundation.
- Issue published online: 21 APR 2005
- Article first published online: 21 APR 2005
- Manuscript No. 191966. Received February 20, 1996; approved April 1, 1996.
Polycrystalline bulk samples of Ti3SiC2 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 kg2-m−4.s−1. The activation energy for oxidation is thus =300 kJ/mol. The room-temperature electrical conductivity is 4.5 × 106Ω−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, Ti3SiC2 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.