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The thermal shock resistance of the ZrB2–SiC–ZrC ceramic

✍ Scribed by Wang Zhi; Qu Qiang; Wu Zhanjun; Shi Guodong

Publisher
Elsevier Science
Year
2011
Weight
980 KB
Volume
32
Category
Article
ISSN
0261-3069

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✦ Synopsis

In the present work, the thermal shock resistance of the ZrB 2 -SiC-ZrC ceramic was estimated by the water quenching method and the flexural strength of the quenched specimen was measured. The measured critical temperature difference of the ZrB 2 -SiC-ZrC ceramic was significantly greater than that of the ZrB 2 -15 vol.% SiC ceramic. The improvement in thermal shock resistance was attributed to its higher fracture toughness (6.7 MPa m 1/2 ) and lower flexural strength (526 MPa) relative to the ZrB 2 -15 vol.% SiC ceramic (4.1 MPa m 1/2 and 795 MPa) based on Griffith fracture criterion. Furthermore, the temperature and thermal stress distributions in the specimen during instantaneous water quenching were simulated by Finite element analysis.

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