Oxidation Behaviors of C-ZrB2-SiC Composite at 2100°C in Air and O2

Zhongwei Zhang; Cewen Nan; Jingjun Xu; Zenghua Gao; Meishuan Li; Junshan Wang

doi:10.1016/j.jmst.2014.04.013

Oxidation Behaviors of C-ZrB₂-SiC Composite at 2100°C in Air and O₂

Zhongwei Zhang^*, Cewen Nan, Jingjun Xu, Zenghua Gao, Meishuan Li, Junshan Wang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

The oxidation behaviors of graphite and ZrB₂-SiC modified graphite composite were investigated at 2100°C in 1×10⁵Pa air and 0.2×10⁵Pa O₂. 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-ZrB₂-SiC at 2100°C were 2.18×10^-2 and 1.05×10^-2 %/s in 1×10⁵Pa air, and 3.23×10^-2 and 2.21×10^-2 %/s in 0.2×10⁵Pa O₂, respectively. The incorporation of ZrB₂ 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-ZrB₂-SiC experienced more severe oxidation at 2100°C in 0.2×10⁵Pa O₂ than in 1×10⁵Pa air. The oxidation rate-controlling step for graphite and C-ZrB₂-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.

Original language	English
Pages (from-to)	1223-1229
Number of pages	7
Journal	Journal of Materials Science and Technology
Volume	30
Issue number	12
DOIs	https://doi.org/10.1016/j.jmst.2014.04.013
Publication status	Published - 1 Dec 2014
Externally published	Yes

Keywords

Ceramic particles
Graphite-based composite
Oxidation mechanism
Oxide scale
Ultra-high temperature oxidation

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10.1016/j.jmst.2014.04.013

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title = "Oxidation Behaviors of C-ZrB2-SiC Composite at 2100°C in Air and O2",

abstract = "The oxidation behaviors of graphite and ZrB2-SiC modified graphite composite were investigated at 2100°C in 1×105Pa air and 0.2×105Pa O2. 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-ZrB2-SiC at 2100°C were 2.18×10-2 and 1.05×10-2 %/s in 1×105Pa air, and 3.23×10-2 and 2.21×10-2 %/s in 0.2×105Pa O2, respectively. The incorporation of ZrB2 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-ZrB2-SiC experienced more severe oxidation at 2100°C in 0.2×105Pa O2 than in 1×105Pa air. The oxidation rate-controlling step for graphite and C-ZrB2-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.",

keywords = "Ceramic particles, Graphite-based composite, Oxidation mechanism, Oxide scale, Ultra-high temperature oxidation",

author = "Zhongwei Zhang and Cewen Nan and Jingjun Xu and Zenghua Gao and Meishuan Li and Junshan Wang",

note = "Publisher Copyright: {\textcopyright} 2014.",

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T1 - Oxidation Behaviors of C-ZrB2-SiC Composite at 2100°C in Air and O2

AU - Zhang, Zhongwei

AU - Nan, Cewen

AU - Xu, Jingjun

AU - Gao, Zenghua

AU - Li, Meishuan

AU - Wang, Junshan

PY - 2014/12/1

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N2 - The oxidation behaviors of graphite and ZrB2-SiC modified graphite composite were investigated at 2100°C in 1×105Pa air and 0.2×105Pa O2. 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-ZrB2-SiC at 2100°C were 2.18×10-2 and 1.05×10-2 %/s in 1×105Pa air, and 3.23×10-2 and 2.21×10-2 %/s in 0.2×105Pa O2, respectively. The incorporation of ZrB2 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-ZrB2-SiC experienced more severe oxidation at 2100°C in 0.2×105Pa O2 than in 1×105Pa air. The oxidation rate-controlling step for graphite and C-ZrB2-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.

AB - The oxidation behaviors of graphite and ZrB2-SiC modified graphite composite were investigated at 2100°C in 1×105Pa air and 0.2×105Pa O2. 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-ZrB2-SiC at 2100°C were 2.18×10-2 and 1.05×10-2 %/s in 1×105Pa air, and 3.23×10-2 and 2.21×10-2 %/s in 0.2×105Pa O2, respectively. The incorporation of ZrB2 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-ZrB2-SiC experienced more severe oxidation at 2100°C in 0.2×105Pa O2 than in 1×105Pa air. The oxidation rate-controlling step for graphite and C-ZrB2-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.

KW - Ceramic particles

KW - Graphite-based composite

KW - Oxidation mechanism

KW - Oxide scale

KW - Ultra-high temperature oxidation

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Oxidation Behaviors of C-ZrB₂-SiC Composite at 2100°C in Air and O₂

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