barrier to the CMCs to reduce the amount of oxygen and other corrosive substances from diffusing through the surface of CMC components. Design Requirements for EBCs: Relative coefficient match with CMC component to reduce probability of cracking Low volatility to minimize stead-induced corrosion/recession Resistant to molten ingested particulate High temperature capability Phase stability at high temperatures Chemical Compatibility with the CMC and additional layers High Hardness and toughness to protect against Foreign Object Damage (FOD) and erosion Typically when coating with an EBC a bond coat is required to support good adhesion to the CMC component. NASA has developed a slurry based EBC which starts with a mullite-based coating before being layered with an additional 2-3 layers. In order for EBCs to actively protect the CMC surface, sintering aids must be added to the slurry coat to create a dense coating that will block the penetration of oxygen, gaseous, and molten deposits from the engine. Sintering creates a densified coating and enhances bonding and performance of the coating. Currently, research is being done to combat common failure modes such as delamination, erosion, and cracking caused by steam or molten deposits. Delamination and cracking due to molten deposits are typically caused by the reaction with the EBC creating an unexpected microstructure leading to CTE mismatch and low toughness in that phase. Steam degradation is caused by the volatilization of the thermally grown oxide layer between the EBC and the ceramic. The steam produced from this leads to a rapid recession of SiC, i.e. degradation of the EBC. The success of EBCs are imperative to the overall success of CMC components in the gas flow of the turbine in jet engines. Overall benefits of EBCs: Extends the life of CMC components allowing for overall cost savings in jet engine production Improves Oxidation Resistance of CMC components Provides greater oxidation resistance to CMC components exposed to gaseous compounds from the jet engine Application of oxide CMC in burner and hot gas ducts Oxygen-containing gas at temperatures above is rather corrosive for metal and silicon carbide components. Such components, which are not exposed to high mechanical stress, can be made of oxide CMCs, which can withstand temperatures up to . The gallery below shows the flame holder of a crispbread bakery as tested after for 15,000 hours, which subsequently operated for a total of more than 20,000 hours. Flaps and ventilators circulating hot, oxygen-containing