Effect of pre-oxidation on strength and thermal shock behavior of ZrB2-SiC-graphite ceramic composites
LIU Yang, 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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Effect of pre-oxidation on strength and thermal shock behavior of ZrB2-SiC-graphite ceramic composit
本站小编 哈尔滨工业大学/2019-10-24
相关话题/Effect pre-oxidation strength and thermal shock
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