以纳米SiC为填料的激光重熔等离子喷涂陶瓷涂层组织及耐腐蚀性能的研究

在45#钢表面,以等离子喷涂技术制备了WC/Co-NiCrAl涂层(TC-1)。采用激光直接重熔等离子喷涂陶瓷涂 层技术制备了激光重熔WC/Co-NiCrAl/laser-remelting陶瓷涂层(FC-2);以纳米SiC粉末为填料,对等离子喷涂层进行 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(FC-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重熔层由WC,W2C,CoO及W组成;纳米改性后的重熔层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。

Research on microstructure and corrosion characteristics of plasma-sprayed Ceramic coating by laser remelting of nano-SiC stuffing

Ceramic coating of WC/Co-NiCrAl(TC-1 coating)has be formed by plasma spraying technology on 45# steel surface. Ceramic coating of WC/Co-NiCrAl/laser-remelting(TC-2) has be formed by laser-remlting of the plasma spraying coating. Using nano- SiC powder material as the coating stuff, laser is also employed to remelt the plasma spraying coating, and the composite ceramic coating of WC/Co-NiCrAl/nano-SiC has be formed(TC-3). The microstructure of three kind of composite ceramic coating has been investigated using x-ray diffraction and scanning electronmicroscopy. 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 coating by WC,W2C,CoO and W, TC-3 ceramic coating by SiC,Si2W, WC, W and CoO. Lamella structure characteristic of plasma-sprayed coatings have been eliminated after the laser-remelting. TC-2 and TC-3 ceramic coatings have higher dense and better corrosion resistance than plasma sprayed TC-1 coating does.