Abstract
In this work, interfacial bonding strength of Al-modified Al2O3 coating was investigated in terms of thermal cycling at 1000 °C, and the corresponding microstructural changes in Al2O3 coating were analysed. The Al2O3 coating was prepared after incorporating wire sprayed Al bond coat in between Al2O3 and C/SiC and then vacuum sintered at 250 °C followed by air-heat treatment at 800 °C and 1000 °C for 1 h. X-ray diffraction and Scanning electron microscopy (SEM) confirmed the formation of a well adhered Al2O3 coating of thickness 330 μm. The Al-modified Al2O3 coating showed remarkable interfacial bonding strength during thermal cycling between 1000 °C and room temperature without any delamination or crack initiation in comparison to pure Al2O3 coating. This study reveals that stability of coating was improved after the incorporation of metallic coating that mechanically interlocked the Al2O3 coating with C/SiC and imparted it with good interfacial bonding to safeguard the C/SiC composite from thermal degradation.
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