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1. Internal oxidation and nitridation are observed, with extensive oxides formed at prior particle boundaries and at porosity in the coating. [color=Red]Internal oxidation and nitridation depletes the coating alloy of scale forming elements and contributes to the early cyclic failure of this TBC coated, HVOF sprayed bondcoat. ÇëÎʺìÉ«¾ä×ÓÊÇʲôÒâ˼£¿²»Ì«ÄÜ¿´Ã÷°×£¡ 2. A region of breakaway oxidation has initiated cracking in the continuous alumina scale. This failure appears to be a type of jacking failure mechanism.ÇëÎʾäÖÐjacking failure mechanismÊÇʲôÒâ˼£¿ 3. During this process yttrium in the coating can oxidise forming adispersion of yttria in this re-melted layer. Õâ¾ä»°´ó¸Åʲô·Ò룿 |
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