Oxidation Behaviors of C-ZrB_2-SiC Composite at 2100 ℃ in Air and O_2

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	Oxidation Behaviors of C-ZrB_2-SiC Composite at 2100 ℃ in Air and O_2
其他题名	Oxidation Behaviors of C-ZrB_2-SiC Composite at 2100 ℃ in Air and O_2
	Zhang Zhongwei 1; Nan Cewen 1; Xu Jingjun 2; Gao Zenghua 2; Li Meishuan 2; Wang Junshan 3
	2014
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	30 期号:12 页码:1223-1229
摘要	The oxidation behaviors of graphite and ZrB_2-SiC modified graphite composite were investigated at 2100 ℃ in 1×10~5 Pa air and 0.2×10~5 Pa O_2. The oxidation tests were conducted in an induction heating furnace. The oxidation of these two materials followed the linear rate law. The determined radius loss rates of graphite and C-ZrB_2-SiC at 2100 ℃ were 2.18×10~(-2) and 1.05×10~(-2) %/s in 1×10~5 Pa air, and 3.23×10~(-2) and 2.21×10~(-2) %/s in 0.2×10~5 Pa O_2, respectively. The incorporation of ZrB_2 and SiC decreased remarkably the oxidation rate of graphite because the oxide scale formed on the sample surface during oxidation helps in reducing the exposed surface area of the underneath substrate. In two different atmospheres with the same oxygen partial pressure, both graphite and C-ZrB_2-SiC experienced more severe oxidation at 2100 ℃ in 0.2×10~5 Pa O_2 than in 1×10~5 Pa air. The oxidation rate-controlling step for graphite and C-ZrB_2-SiC was proposed to be the inward diffusion of oxygen through the boundary layer and through the pores in the oxide scale, respectively. A model based on diffusion theory was established to discuss the effect of the total gas pressure on their oxidation behaviors.
其他摘要	The oxidation behaviors of graphite and ZrB_2-SiC modified graphite composite were investigated at 2100 ℃ in 1×10~5 Pa air and 0.2×10~5 Pa O_2. The oxidation tests were conducted in an induction heating furnace. The oxidation of these two materials followed the linear rate law. The determined radius loss rates of graphite and C-ZrB_2-SiC at 2100 ℃ were 2.18×10~(-2) and 1.05×10~(-2) %/s in 1×10~5 Pa air, and 3.23×10~(-2) and 2.21×10~(-2) %/s in 0.2×10~5 Pa O_2, respectively. The incorporation of ZrB_2 and SiC decreased remarkably the oxidation rate of graphite because the oxide scale formed on the sample surface during oxidation helps in reducing the exposed surface area of the underneath substrate. In two different atmospheres with the same oxygen partial pressure, both graphite and C-ZrB_2-SiC experienced more severe oxidation at 2100 ℃ in 0.2×10~5 Pa O_2 than in 1×10~5 Pa air. The oxidation rate-controlling step for graphite and C-ZrB_2-SiC was proposed to be the inward diffusion of oxygen through the boundary layer and through the pores in the oxide scale, respectively. A model based on diffusion theory was established to discuss the effect of the total gas pressure on their oxidation behaviors.
关键词	Graphite-based composite Ceramic particles Ultra-high temperature oxidation Oxide scale Oxidation mechanism
收录类别	CSCD
语种	英语
CSCD记录号	CSCD:5323567
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/152015
专题	中国科学院金属研究所
作者单位	1.清华大学 2.中国科学院金属研究所 3.Science and Technology on Advanced Functional Composites Laboratory, Aerospace Research Institute of Materials and Processing Technology
推荐引用方式 GB/T 7714	Zhang Zhongwei,Nan Cewen,Xu Jingjun,et al. Oxidation Behaviors of C-ZrB_2-SiC Composite at 2100 ℃ in Air and O_2[J]. Journal of Materials Science & Technology,2014,30(12):1223-1229.
APA	Zhang Zhongwei,Nan Cewen,Xu Jingjun,Gao Zenghua,Li Meishuan,&Wang Junshan.(2014).Oxidation Behaviors of C-ZrB_2-SiC Composite at 2100 ℃ in Air and O_2.Journal of Materials Science & Technology,30(12),1223-1229.
MLA	Zhang Zhongwei,et al."Oxidation Behaviors of C-ZrB_2-SiC Composite at 2100 ℃ in Air and O_2".Journal of Materials Science & Technology 30.12(2014):1223-1229.