Sintering and mechanical properties of [beta]-SiC powder obtained from waste tires

• Published in: Journal of advanced ceramics 2016-01, Vol.5 (1), p.40
• Main Authors: Magnani, G, Galvagno, S, Sico, G, Portofino, S, Freda, C, Burresi, E
• Format: Article
• Language: English
• ISSN: 2226-4108; 2227-8508
• DOI: 10.1007/s40145-015-0170-0

Plasma synthesized SiC powder obtained from quartz and carbonaceous residue of waste tires was successfully sintered at 1925 by pressureless liquid-phase method using yttria and alumina as sintering aids (T-SiC). Comparison with sintered SiC obtained from commercial powder (C-SiC) put in evidence of similar sintered density (98%T.D.), but much finer microstructure of T-SiC than that of C-SiC. T-SiC also showed higher flexural strength than C-SiC both at room temperature (508 vs. 458 MPa) and at 1500 (280 vs. 171 MPa). Difference in liquid phase was responsible for the differences in hardness and fracture toughness. The high value of the Young's modulus of T-SiC (427 MPa) confirmed the high degree of sinterability of this powder and that it can be a promising candidate for structural applications with high added value.