Effect of high temperature heat treatment on the ablation of SiC-ZrB2-ZrC particles modified C/C composites in two heat fluxes

被引：27
作者：
Li, Hejun [1 ]
Liu, Lei [1 ]
Zhang, Yudan [1 ]
Li, Kezhi [1 ]
Shi, Xiaohong [1 ]
Zhang, Yulei [1 ]
Feng, Wei [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 621卷
基金：
中国国家自然科学基金;
关键词：
Ceramics; Composite materials; Corrosion; Heat conduction; REACTIVE MELT INFILTRATION; CARBON/CARBON COMPOSITES; OXYACETYLENE TORCH; THERMAL-EXPANSION; MICROSTRUCTURE; BEHAVIORS; TOUGHNESS; ZRB2-ZRC; CARBIDE;
D O I：
10.1016/j.jallcom.2014.09.193
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Effect of high temperature heat treatment on the ablation of carbon/carbon (C/C) composites modified by SiC-ZrB2-ZrC particles was investigated under oxyacetylene torch. The composites were prepared through thermal gradient chemical vapor infiltration at 900-1100 degrees C and precursor infiltration and pyrolysis at 1400-800 degrees C. The SiC-ZrB2-ZrC particles modified C/C composites with and without heat treatment at 2100 degrees C were named as C/C-ZSA and C/C-ZSB, respectively. Compared with C/C-ZSB, C/C-ZSA had four kinds of cracks, higher thermal conductivity, lower ablation rates in heat flux of 4.18 MW/m(2) and promoted ablation in 2.38 MW/m(2). Different thermal conductions induced various rises of surface temperature. The surface temperature and these four cracks determined local thermal stress and infiltration of oxidizing species, which dominated mechanical erosion of outer layer and oxidation of sub-layer. Compared with C/C-ZSB, the existence of these four cracks and lower surface temperature of C/C-ZSA reduced mechanical erosion in 4.18 MW/m(2) but resulted in enhanced oxidation in 2.38 MW/m(2). (C) 2014 Elsevier B.V. All rights reserved.
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页码：18 / 25
页数：8
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