Journal
JOURNAL OF ADVANCED CERAMICS
Volume 5, Issue 1, Pages 40-46Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s40145-015-0170-0
Keywords
sintering; mechanical properties; SiC; structural application
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Funding
- Seventh Framework Programme (FP7) [226549]
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Plasma synthesized SiC powder obtained from quartz and carbonaceous residue of waste tires was successfully sintered at 1925 degrees C 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 degrees C (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.
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