Journal
CERAMICS INTERNATIONAL
Volume 41, Issue 9, Pages 10891-10896Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.05.030
Keywords
C. Thermal properties; h-BN/Y2SiO5 composite; High-temperature mechanical properties
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Funding
- Natural Sciences Foundation of China [50802099, 51072201, 51172221]
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High-temperature mechanical and thermal properties of h-BN/30 vol%Y2SiO5 composite were systematically investigated in this study. The composite exhibits an improved elastic modulus and strength at high temperatures. The elastic modulus reaches a maximum of 98 GPa at 1478 K, and the flexural strength increases from 119 +/- 3 to 188 +/- 12 MPa in the range from room temperature to 1473K. These improvements in the mechanical properties of the material are primarily attributed to the closing of microcracks in both the h-BN matrix and the h-BN/Y2SiO5 interphase. Particularly, the strengthening effect at 1473 K results from the healing of surface defects by borosilicate glass formed during testing in air. The linear coefficients of thermal expansion in the temperature range of 373 to 1573 K in the perpendicular and parallel directions are determined to be 4.4-5.0 x 10(-6) and 7.9-9.2 x 10(-6) K-1, respectively. The room-temperature thermal conductivities in the perpendicular and parallel directions are determined to be 42 and 28W.m(-1).K-1; these values subsequently decrease to 18 and 12W.m(-1).K-1 at 1473 K, respectively. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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