中国空间科学技术

中国空间科学技术

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SiC/Al复合丝的耐蚀性和高温稳定性研究

郝元恺,向明东   

  1. 国防科技大学 ,国防科技大学
  • 发布日期:1988-02-25

AN INVESTIGATION OF CORROSION AND HIGH TEMPERATURE STABILITY IN SILICON CARBIDE REINFORCED ALUMINUM PRECURSOR WIRE

Hao Yuankai Xiang Mingdong (University of National Defence Science and Technology)   

  • Online:1988-02-25

被引次数

2

摘要： 本研究结果表明,SiC/L_6和SiC/LF_6复合丝在真空中加热至600℃和在空气中400℃暴露144小时,以及在蒸馏水和5%NaCl水溶液中浸泡15天后,其强度保留率大于87%,证明SiC/Al复合丝具有良好的耐蚀性和高温稳定性,用气相层析仪和发射光谱分析了腐蚀气体、溶液和白色沉淀,初步确定其反应机理是电化学腐蚀。与C/Al复合丝相比,SiC/Al腐蚀速度缓慢,纤维—基体界面损伤极小。

关键词: 耐蚀性, 稳定性, 金属基复合材料, 研究

Abstract: The results show that the tensile strengh retention of the SiC/Al and SiC/LF 6 precursor wire under three kinds of treatments is high(>87%). The three treatments include elevated temperature up to 600℃ in Vacuum; exposure for 144 hours at 400℃ in air; and immersion in distilled water and in 5% NaCl solution at room temperature for 15 days. The SiC/Al precursor wire exhi(?)its excellent corrosion resistance and high themal stability at elevated temperature. The coriosion gases, corrosion products and the solution are examined by means of gas chromatogragh and disperse spectrometer. It is estimated that the reaction mechanism is primarily the electrochemistry corrosion. The corrosion rate of the precursor wire of SiC/Al is much slower than that of C/Al, and only a little damage of the interface between SiC fiber and aluminum matrix is noted.

Key words: Corrosion resistance, Thermal stability, Metal matrix composite, Research