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

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

• Thin Film and Coatings • Previous Articles Next Articles

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

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

Abstract

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

Minghui Chen, Mingli Shen, Xin Wang, Shenglong Zhu, Fuhui Wang. Oxidation and Thermal Shock Behavior of a Glass-Alumina Composite Coating on K38G Superalloy at 1000 °C[J]. J Mater Sci Technol, 2012, 28(5): 433-438.

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

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