J. Mater. Sci. Technol. ›› 2012, Vol. 28 ›› Issue (5): 433-438.

• Reviews • 上一篇    下一篇

Oxidation and thermal shock behavior of a glass-alumina composite coating on K38G superalloy at 1000 oC

陈明辉1,沈明礼1,汪欣1,朱圣龙1,王福会2   

  1. 1. 中国科学院金属研究所
    2. 中科院金属所
  • 收稿日期:2011-06-02 修回日期:2011-12-12 出版日期:2012-05-30 发布日期:2012-05-29
  • 通讯作者: 陈明辉
  • 基金资助:

    国家自然科学基金;中国科学院知识创新工程重要方向项目

Oxidation and Thermal Shock Behavior of a Glass-Alumina Composite Coating on K38G Superalloy at 1000 °C

Minghui Chen, Mingli Shen, Xin Wang, Shenglong Zhu, Fuhui Wang   

  1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2011-06-02 Revised:2011-12-12 Online:2012-05-30 Published:2012-05-29
  • Contact: Minghui Chen
  • Supported by:

    the Knowledge Innovation Program of the Chinese Academy of Sciences, Grant No. YYYJ-0912, and the National Natural Science Foundation of China, Grant No. 50774074

RichHTML

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摘要： The glass-alumina composite coatings were successfully prepared on the K38G superalloy substrates. Their isothermal oxidation and thermal shock behavior at 1000 oC were characterized. With a post-annealing process at 850 oC, the composite coatings possessed an improved protective effect for the alloy substrates from isothermal oxidation and a higher resistance to thermal shock. Crystallization from the glass matrix and interfacial reaction between glass matrix and alumina inclusions, which caused the composites more refractory and tough, accounted for this improvement. The micromechanisms for the formation of oxidation results of spinel ZnCr2O4 were also discussed.

Abstract: The glass-alumina composite coatings were successfully prepared on the K38G superalloy substrates. Their isothermal oxidation and thermal shock behavior at 1000 °C were characterized. With a post-annealing process at 850 °C, the composite coatings possessed an improved protective effect for the alloy substrates from isothermal oxidation and a higher resistance to thermal shock. Crystallization from the glass matrix and interfacial reaction between the matrix and alumina inclusions, which caused the composites more refractory and tough, accounted for this improvement. The  micromechanisms for the formation of oxidation results of spinel ZnCr2O4 were also discussed.

Key words: Micromechanics, Glass-alumina, Nickel based superalloys, Oxidation, Precipitation