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Fe3Al多孔材料預(yù)氧化性能研究
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973-ITER計劃專項 (2010GB113003)


Research on the Preoxidation Performance of Fe3Al Porous Materials
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    摘要:

    以Cr改性的Fe3Al預(yù)合金粉末為原料，采用粉末冶金方法制備Fe3Al多孔材料，研究氧化溫度、時間、降溫速度對Fe3Al多孔材料氧化膜性能的影響。結(jié)果表明：Fe3Al多孔材料的氧化增重隨溫度的升高而增大，氧化動力學(xué)遵循四次方規(guī)律，在800 ℃的大氣中氧化9 h，氧化膜已完全將燒結(jié)頸覆蓋，晶粒細小；隨著溫度的升高和時間的延長，晶粒變得粗大；900 ℃氧化5 h，膜層已出現(xiàn)裂紋；而降溫速度對氧化增重的影響不大，也沒有出現(xiàn)由于熱膨脹不匹配而產(chǎn)生的裂紋

    Abstract:

    Fe3Al porous materials were fabricated by the powder metallurgy method with Cr-modified Fe3Al pre-alloy powder as starting material. The effects of oxidation temperature and time, and cooling rate on properties of oxidation scales of Fe3Al porous materials were researched. The results show that oxidation mass gain is increased with the temperature increasing. Oxidation kinetics of Fe3Al porous materials follows the fourth power rules. The oxidation scales with small grain size have completely covered the sintered neck of Fe3Al porous materials after 9 h oxidation in atmosphere at 800 oC. The grains become coarse with higher temperature and longer time. The cracks have appeared on oxidation scales after 5 h oxidation in atmosphere at 900 oC. Cooling rate has little effect on mass gain and the cracks do not appear due to the unmatched thermal expansion coefficient.

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康新婷,王建永,遲煜頔,葛 淵,談 萍,許中國. Fe3Al多孔材料預(yù)氧化性能研究[J].稀有金屬材料與工程,2012,41(8):1435~1438.[Kang Xinting, Wang Jianyong, Chi Yudi, Ge Yuan, Tan Ping, Xu Zhongguo. Research on the Preoxidation Performance of Fe3Al Porous Materials[J]. Rare Metal Materials and Engineering,2012,41(8):1435~1438.]
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  • 收稿日期:2012-03-05
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