Microstructure and High-Temperature Corrosion Resistance of Co-based TiC Cermet Coating Prepared by Plasma Spraying

A Co-based TiC cermet coating on the sarface of GH586 alloy was prepared by plasma spray. The influence of TiC content on the microstructure and high-temperature corrosion resistance of the coating was investigated. The results showe that TiC ceramic particles had good wettability with Co powder. A microstructure of TiC particles and Co powder wrapping with each other formed and the coating was tightly bound to the substrate without defects. Addition of TiC in the Co-based alloy powder improved the abrasion resistance of the coating. However, the agglomeration became serious when the content of TiC was overhigh, which reduced the high-temperature corrosion resistance of the coating. The coating with 10% (mass) TiC showed excellent high-temperature corrosion resistance and abrasion resistance because TiC particles were evenly distributed in the coating.