中文摘要：

在45号钢表面,制备了WC/Co-NiCrAl等离子喷涂涂层（TC-1）和WC/Co-NiCrAl/laser-remelting激光直接重熔等离子喷涂陶瓷涂层（TC-2）。以纳米SiC粉末为填料,对等离子喷涂层TC-1进行了填料下的激光重熔,制备了纳米SiC改性的WC/Co-NiCrAl/nano-SiC复合陶瓷涂层（TC-3）。采用X射线衍射、扫描电镜对三种涂层微观组织进行了分析,同时对陶瓷涂层的耐腐蚀性能进行了研究。结果表明,TC-1涂层由WC,W2C,W6C2.54,W,Co,CoO组成;TC-2重熔涂层由WC,W2C,CoO及W组成;纳米改性后的重熔涂层TC-3由SiC,Si2W,WC,W及CoO组成。在激光作用下,原等离子喷涂层WC/Co的片层状组织得以消除。与TC-1涂层相比,TC-2及TC-3陶瓷涂层致密化程度明显提高,涂层耐腐蚀性能也得到了明显的改善。

英文摘要：

Ceramic coating of WC/Co-NiCrAl（TC-1） coating was formed by plasma spraying technology on 1045 steel surface.Ceramic coating of WC-Co-NiCrAl/laser-remelting（TC-2） was formed by laser-remelting of the plasma spraying coating.Using nano-SiC powder material as the coating stuff,laser was also employed to remelt the plasma spraying coating,and the composite ceramic coating of WC/Co-NiCrAl/nano-SiC was formed（TC-3）.The microstructures of three kind of composite ceramic coating were investigated using X-ray diffraction and scanning electron microscopy.Also,corrosion behavior of the coatings was studied.The results show that TC-1 ceramic coating consists of WC,W2C,W6C2.54,W,Co and CoO;TC-2 ceramic coatings are WC,W2C,CoC and W;TC-3 ceramic coatings are SiC,Si2W,WC,W and CoO.Lamella structure characteristic of plasma-sprayed coatings were eliminated after the laserremelting.TC-2 and TC-3 ceramic coatings have higher dense and better corrosion resistance than plasma sprayed TC-1 coating.