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J Chin Soc Corr Pro  2009, Vol. 29 Issue (4): 301-305    DOI:
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THERMODYNAMIC ANALYSIS FOR PHASE EQUILIBRIUM OF MC(B)-C-O SYSTEM IN ULTRA-HIGH TEMPERATURE CONDITIONS
ZHONG Hongbin1; LI Meishuan1; ZHOU Yanchun1;WANG Junshan2; XU Zhenghui2; ZHANG Zhongwei2; FANG Xueliang2
1.Shenyang National Laboratory for Materials Science;Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016
2.National Key Laboratory of Advanced Functional Composite Materials Technology; Aerospace Research Institute of Materials and Processing Technology; Beijing 100076
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Abstract  

ΔG0-T diagrams of the reactions between some typical transition metal carbides (or borides) and oxygen were drawn using Matlab software. On the basis of these ΔG0-T diagrams, equilibrium partial oxygen pressures were obtained accordingly. The volatility diagrams for ZrC-ZrO2 system and SiC-SiO2 system at \linebreak2500 K were drawn and the function of the partial press of various related products in the ZrC-ZrO2 system with temperature was evaluated. The calculation results indicated that the oxygen activity and equilibrium partial oxygen pressure of these carbides changed with temperature. According to the volatility diagrams of ZrC-ZrO2 and SiC-SiO2 systems, the vapour pressure of related oxides may be very high at the interfaces, even higher than 105 Pa, which is detrimental to the formation of entire oxide scales on carbides during ultra-high temperature oxidation. This work provided significant insight into the behaviour of ultra-high temperature oxidation of C/C composites and ultra-high temperature ceramics. It especially provided theoretical considerations for choosing oxidation-resistance dopants in C or C/C composites.

Key words:  thermodynamic analysis      ultra-high temperature ceramics      carbon/carbon composites      ultra-high temperature oxidation     
Received:  03 January 2008     
ZTFLH: 

TG172.82

 
Corresponding Authors:  ZHONG Hongbin     E-mail:  mshli@imr.ac.cn

Cite this article: 

ZHONG Hongbin LI Meishuan ZHOU Yanchun WANG Junshan XU Zhenghui ZHANG Zhongwei. THERMODYNAMIC ANALYSIS FOR PHASE EQUILIBRIUM OF MC(B)-C-O SYSTEM IN ULTRA-HIGH TEMPERATURE CONDITIONS. J Chin Soc Corr Pro, 2009, 29(4): 301-305.

URL: 

https://www.jcscp.org/EN/     OR     https://www.jcscp.org/EN/Y2009/V29/I4/301

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