高温树脂基复合材料防护用轻质陶瓷涂层的制备

Depositing light ceramic coating on high temperature polymer matrix composite substrate

摘要: 研究了采用Ni-3%Al粉末和纯铝、纯锌作为打底材料在碳纤维增强聚酰亚胺复合材料(PMC)基体上制备Al₂O₃轻质陶瓷防护涂层的可行性,测试了涂层的剪切结合强度和耐热循环性能。结果表明,等离子喷涂Ni-3%Al粉末会对PMC基体造成破坏,不适合于作为PMC基体上的打底材料。电弧喷铝也会对基体造成一定程度的破坏,结合强度和耐热循环性能较低。采用低电压、小电流电弧喷锌,可以获得和基体结合良好打底涂层,涂层剪切结合强度达10.45MPa。在其上制备的Al₂O₃陶瓷防护涂层耐热循环性能良好。

Abstract: 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.