反应等离子喷涂TiN-TiC_(0.2～0.3)N_(0.7～0.8)-TiB_2基陶瓷复合涂层的性能

Performance of TiN-TiC_(0.2～0.3)N_(0.7～0.8)-TiB_2 Coatings Prepared by Reactive Plasma Spray

为了制备性能优良的Ti-B-N涂层，以Ti-B4C-C—N为反应体系、选用2种粉末配方，采用反应等离子喷涂法在Q235碳钢表面制备了TiN-TiC0．2~0．3N0．7~0．8-TiB2基陶瓷复合涂层，并对其物相、截面微观结构、显微硬度及3．5％NaCl溶液中的耐蚀性能进行了分析。结果表明：制备的陶瓷涂层均由Ti的碳氮硼化物组成，不同粉末配方获得的涂层的相成分有所差异；当粉末配比（摩尔比）为Ti：B4C：C=4：1：1时，涂层厚约120μm，主要为TiN，TiN0．3，TiC0．2N0．8，TiB2；而粉末配比为Ti：B4C：C=14：3：5时涂层主要物相为TiN，TiN0．3，TiC0.3N0.7，TiB2，涂层成分均匀，厚度约为145μm；与基体相比，TiN-TiC0．2~0．3N0．7~0．8-TiB2涂层的显微硬度显著提高；粉末配比为Ti：B4C：C=14：3：5时陶瓷涂层在3．5％NaCl溶液中的耐蚀性能最佳。

TiN-TiC_(0.2-0.3)N_(0.7-0.8)-TiB_2 matrix ceramic coatings were prepared by reactive plasma spray on Q235 carbon steel in the Ti-B_4C-C-N reactive system.The phase composition,cross-section microstructure,micro- hardness and corrosion resistance of the coating in simulated seawater(3.5%NaCl solution) were investigated.Results showed that the ceramic coating was composed of titanium carbide-nitride-borides,and the phase composition of coating made of different powder formulations was different.When the powder formulation was Ti:B_4C:C =4:1:1(molar ratio,the same hereafter),the thickness of coating was about 120 μm and the phase compositions were TiN,TiN_(0.3),TiC_(0.2)N_(0.8) and TiB_2.As the powder formulation was Ti:B_4C:C = 14:3:5,the thickness of coating was about 145μm and the phase compositions were TiN,TiN_(0.3),TiC_(0.3)N_(0.7) and TiB_2.Compared with the substrate,the TiN-TiC_(0.2-0.3)N_(0.7-0.8)-TiB_2 coatings had greatly improved micro-hardness.Besides,the coating prepared with the powder formulation of Ti:B_4C:C =14:3:5 had the best corrosion resistance.