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Oxidation Behaviors of C-ZrB_2-SiC Composite at 2100 ℃ in Air and O_2
Alternative TitleOxidation Behaviors of C-ZrB_2-SiC Composite at 2100 ℃ in Air and O_2
Zhang Zhongwei1; Nan Cewen1; Xu Jingjun2; Gao Zenghua2; Li Meishuan2; Wang Junshan3
2014
Source PublicationJournal of Materials Science & Technology
ISSN1005-0302
Volume30Issue:12Pages:1223-1229
AbstractThe 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.
Other AbstractThe 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.
KeywordGraphite-based composite Ceramic particles Ultra-high temperature oxidation Oxide scale Oxidation mechanism
Indexed ByCSCD
Language英语
CSCD IDCSCD:5323567
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/152015
Collection中国科学院金属研究所
Affiliation1.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
Recommended Citation
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.
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