Advanced ceramic coatings and materials for extreme by Hua-Tay Lin; Taejin Hwang; Soshu Kirihara; Sujanto Widjaja

By Hua-Tay Lin; Taejin Hwang; Soshu Kirihara; Sujanto Widjaja

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The fracture surface also exhibited a high degree of fiber pull-out near the coated surface and significantly less near the backside. This suggests that the EBC acted to reduce the amount of oxygen ingress into the matrix from the coating/substrate interface, resulting in significantly less oxidation-assisted crack growth. The addition of the EBC reduced oxidation ingress on the heated surface, preventing strong bonding of the reinforcing fibers. The weak interfacial bonding allows for debonding between the fiber/BN interface or the BN/matrix interface.

Wang, J. L. Yu, J. Zhang, D. H. Zhang, Preparation and properties of pressureless-sintered porous Si3N4, J. Mater. , 45, 3671-3676 (2010). X. M. Li, L. T. Zhang, X. W. , 66, 33-36(2012). 6 X. M. Li, X. W. T. Zhang, L. F. Chen, Y. C. Qi, Mechanical and dielectric properties of porous SÍ3N4-SÍ02 composite ceramics, Mater. Sci. , A, 500, 63-69 (2009). R. B. Zhang, D. N. Fang, Y. M. Pei, L. C. Zhou, Microstructure, mechanical and dielectric properties of highly porous silicon nitride ceramics produced by a new water-based freeze casting, Ceram.

The Figure 8. SEM micrographs of the fracture surface of EBC-lcoated laser-heated sample ZMI-2. Higher magnification images show increased fiber pull-out near EBC/CMC interface. 26 • Advanced Ceramic Coatings and Materials for Extreme Environments III Creep and Environmental Durability of Environmental Barrier Coatings transverse matrix cracks seen in ZMI-2 were not through thickness and in most cases did not penetrate past the second or third ply of the composite. While Figure 9 shows some level of EBC cracking, bond coat delamination leading to coating spallation at the EBC/CMC interface was not observed.

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