Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7898631 | Journal of the European Ceramic Society | 2018 | 28 Pages |
Abstract
Process-tolerant SiC ceramics were prepared by pressureless sintering at 1850-1950 °C for 2 h in an argon atmosphere with a new quaternary additive (Al2O3-Y2O3-CaO-SrO). The SiC ceramics can be sintered to a > 94% theoretical density at 1800-1950 °C by pressureless sintering. Toughened microstructures consisting of relatively large platelet grains and small equiaxed grains were obtained when SiC ceramics were sintered at 1850-1950 °C. The presently fabricated SiC ceramics showed little variability of the microstructure and mechanical properties with sintering within the temperature range of 1850-1950 °C, demonstrating process-tolerant behavior. The thermal conductivity of the SiC ceramics increased with increasing sintering temperature from 1800 °C to 1900 °C due to decreases of the lattice oxygen content of the SiC grains and residual porosity. The flexural strength, fracture toughness, and thermal conductivity of the SiC ceramics sintered at 1850-1950 °C were in the ranges of 444-457 MPa, 4.9-5.0 MPa m1/2, and 76-82 Wmâ1 Kâ1, respectively.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yu-Kwang Seo, Jung-Hye Eom, Young-Wook Kim,