Study on the abstruction effect of Al2O3 film against the internal reaction of NiCrAlY-SiC composite coating in high temperature environment and the wear resistance of the coating
In order to solve the problem related to the reaction of SiC particles with Ni element in the abrasive blade tip coating pre-pared by composite electroplating under high temperature conditions and the resulting decrease in the wear resistance,Al2O3 films were coated on the surface of SiC particles by chemical vapor deposition(CVD)process to block the reaction between SiC and Ni.The barrier effect of Al2O3 films with two thickness ranges of 0.5-1.0 μm and 5.0-10.0 μm on the reaction between SiC and NiCrAlY in NiCrAlY-SiC@Al2O3 abrasive blade tip electroplated coating at high temperature environment of 1 100℃ was studied,and the wear resistance of NiCrAlY-SiC@Al2O3 abrasive blade tip electroplated coating with two different Al2O3 film thickness was also tested after being kept at 1 100℃ for 500 h.The results show that Al2O3 film with a thickness of 5.0-10.0 μm can effectively block the high temperature reaction between SiC particles and NiCrAlY coating.It helps NiCrAlY-SiC@Al2O3 coating maintain good wear resistance under 1 100℃ high temperature environment and form a good wear matching effect with the ZrO2 ceramic seal coating.
NiCrAlY composite electroplated coatingAl2O3 filmSiCabrasive blade tip
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