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中国腐蚀与防护学报  2009, Vol. 29 Issue (4): 301-305    
  研究报告 本期目录 | 过刊浏览 |
MC-C-O体系在超高温条件下相平衡的热力学分析
钟洪彬1;李美栓1;周延春2;王俊山2;许正辉2;张中伟2;房学良
1.中国科学院金属研究所 材料科学国家(联合)实验室 沈阳 110016
2.航天材料及工艺研究所先进功能复合材料技术国防科技重点实验室 北京 100076
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
全文: PDF(533 KB)  
摘要: 

从热力学角度出发,采用工程数学软件Matlab计算出了 在涉及超高温(2073 K以上)范围的宽温域内一些典型过渡金属 碳(硼)化物与氧反应的Δ G0,以及相应的平衡氧分压;在此基础上 绘制了2500 K时ZrC-ZrO2体系和SiC-SiO2体系的氧化物蒸气压图以及界面蒸气压随温度的变化曲线。依据上述热力学数据,可以了解不同碳化物的氧活性和平衡氧分压随温度的变化规律,以及ZrC-ZrO2和SiC-SiO2体系氧化物蒸气压特别是界面蒸气压的大小,对于深入了解改性C/C复合材料和超高温陶瓷的超高温氧化行为,特别是对于改性C/C复合材料中有效的抗氧化添加剂的选择有理论指导意义。

关键词 热力学分析超高温陶瓷C/C复合材料超高温氧化    
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 wordsthermodynamic analysis    ultra-high temperature ceramics    carbon/carbon composites    ultra-high temperature oxidation
收稿日期: 2008-01-03     
ZTFLH: 

TG172.82

 
基金资助:

国家自然科学基金资助(50771099)

通讯作者: 李美栓     E-mail: mshli@imr.ac.cn
Corresponding author: ZHONG Hongbin     E-mail: mshli@imr.ac.cn
作者简介: 钟洪彬, 男, 1981年生, 硕士生,研究方向为改性C/C复合材料的氧化烧蚀机理研究

引用本文:

钟洪彬 李美栓 周延春 王俊山 许正辉 张中伟 房学良. MC-C-O体系在超高温条件下相平衡的热力学分析[J]. 中国腐蚀与防护学报, 2009, 29(4): 301-305.
ZHONG Hong-Ban, LI Mei-Shuan, ZHOU Yan-Chun, YU Jun-Shan, XU Zheng-Hui, ZHANG Zhong-Wei. 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.

链接本文:

https://www.jcscp.org/CN/      或      https://www.jcscp.org/CN/Y2009/V29/I4/301

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