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Supervised by Ministry of Industry and Information Technology of The People's Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:LIU Yang,LIANG Jun.Effect of pre-oxidation on strength and thermal shock behavior of ZrB2-SiC-graphite ceramic composites[J].Journal of Harbin Institute Of Technology(New Series),2012,19(1):12-16.DOI:10.11916/j.issn.1005-9113.2012.01.003.
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Effect of pre-oxidation on strength and thermal shock behavior of ZrB2-SiC-graphite ceramic composites
Author NameAffiliation
LIU Yang Center for Composite Materials,Harbin Institute of Technology,Harbin 150001, 
LIANG Jun Center for Composite Materials,Harbin Institute of Technology,Harbin 150001, 
Abstract:
A novelty technique,namely,pre-oxidation,has been proposed to improve the strength and thermal shock behavior of ZrB2-SiC-graphite ceramic composites,which is a promising candidate for ultra-high temperature ceramics ( UHTCs) in aerospace engineering. The composite is pre-oxidized at temperatures of 900 ℃ and 1100 ℃ for 1 h and 3 h in air. A theoretical model considering surface heat transfer has been given and analyzed. A water-quenching technique is adopted at different temperatures from 300 ℃ to 600 ℃ in order to investigate the thermal shock behavior of pre-oxidized composites. The critical thermal shock temperature improves more than 40% after pre-oxidizing at 1100 ℃ for 3 h. However,the composites strength is not improved as a result of the insensitivity to surface defects.
Key words:  UHTCs  thermal properties  thermal shock  pre-oxidation  strength
DOI：10.11916/j.issn.1005-9113.2012.01.003
Clc Number:TB33
Fund:

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