Depositing light ceramic coating on high temperature polymer matrix composite substrate

Feasibility of depositing Al₂O₃ coating on carbon fiber reinforced polymer matrix composite(PMC) with Ni-3% Al powder,aluminum or zinc as the bond layer was investigated.Shear strength and thermal cycling resistance of the coatings were tested.The results showed that plasma sprayed Ni-3% Al powder would damage the PMC substrate and was not suitable for bonding ceramic coating on PMC substrate.Arc sprayed aluminum would make some damage to the substrate,too.And the shear strength and thermal cycling resistance of the coating were low.Arc sprayed zinc with low voltage and low current would form good bond layer on PMC substrate,and the shear strength could be as high as 10.45MPa.Thermal cycling resistance of Al₂O₃ coating deposited on zinc bond layer was good.