Effect of Y₂O₃ Coating on the Interface and Mechanical Properties of SiC Fiber Reinforced GH4738 Composites

Abstract:

To prevent the strong interfacial reactions in SiC fiber reinforced nickel-based superalloys matrix composites, yttrium oxide (Y₂O₃) was used as the barrier coating by reaction magnetron sputtering method. Compared with the composites without coating, after the high temperature hot isostatic pressing (HIP), Y₂O₃ coating effectively protected the SiC fibers from the interfacial reactions, and no element diffusion can be observed between the fibers and the matrix. The elevated temperature tensile tests were performed on both SiC/GH4738 and SiC/Y₂O₃/GH4738 composite. The results indicated that the strength of the composites with Y₂O₃ coating can increase about 35% in comparison with the composites without coating.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 604-608
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.604
• Online since: June 2017
• Authors: Pei Huan Li, Yong Zhang, Xuan Hui Qu*
• Keywords: Composite Materials, Interface, SiC Fiber, Y₂O₃ Coating

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