Analysis of cracking in candidate environmental barrier coatings

Abstract eng:
The desire to increase the operating temperatures of turbine engines has led to the exploration of silicon carbide composites as a replacement for nickel based superalloys. The combustion environment is very harsh and will lead to failure if parts are not protected. This protection comes from a multilayer environmental barrier coating (EBC) which must provide resistance against corrosive species and be compatible with the substrate. In some candidate EBC systems, vertical channel cracks have been observed bifurcating and turning into horizontal delamination cracks in multiple material systems. This complex cracking phenomena has been studied using a high throughput FEA tool to model the likelihood of crack advancement. A discrete element approach was also used to model crack growth after initiation. The property ranges for a coating system that are resistant to this type of cracking behavior are shown.

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