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

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Additional info for Advanced ceramic coatings and materials for extreme environments III : a collection of papers presented at the 37th International Conference in Advanced Ceramics and Composites, January 27-February 1, 2013, Daytona Beach, Florida

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In contrast to ZMI-1, most of the observed oxidation in ZMI-2 is along the back surface of the composite. 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.

Okuhara and H. Matsubara, "Memorizing Maximum Strain in Carbon-Fiber-Reinforced Plastic Composites by Measuring Electrical Resistance Under Pre-Tensile Stress," Compos. Sci. , 65 [14] 2148-2155 (2005). ,8 A. Todoroki, K. Omagari, Y. Shimamura, and H. Kobayashi, "Matrix Crack Detection of CFRP Using Electrical Resistance Change with Integrated Surface Probes," Compos. Sci. , 66 [11-12] 1539-1545(2006). Advanced Ceramic Coatings and Materials for Extreme Environments III • 29 Creep and Environmental Durability of Environmental Barrier Coatings l9 S.

The only oxidation that was observed was in the first 0° ply of the backside of the CMC. As previously mentioned, higher levels of fiber debonding and sliding lead to the pseudo-plastic behavior desired for brittle composites. This is evident by the high post-creep strength and strain capability of this composite. Figure 9. Optical micrographs of longitudinal section of ZMI-2. This sample showed mainly backside cracking that did not penetrate through thickness. Figure 10. SEM micrographs of the fracture surface of EBC-2 coated isothermal sample ZMI-3.

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