基于SHS反应火焰喷涂技术,采用Ti-B4C-C喷涂体系,在钢基表面制备了TiC-TiB2复相陶瓷涂层.通过对SHS火焰喷涂陶瓷涂层的电子显微观察和X射线衍射及能谱分析,探讨了SHS反应火焰喷涂TiC-TiB2复相陶瓷涂层的组织结构及成因.研究发现,涂层是一种复相非均质、传统热喷涂层状涂层特征不明显的亚稳结构.涂层由占主体的TiC0.7N0.3、TiC0.2N0.8、TiB2相和少量TiO2、Ti2O、Ti3O5相及气孔组成.涂层中有三类特征各异的组织,即尺度在微-纳米级呈团簇状分布的组织,尺寸在1～3μm之间呈等轴状颗粒分布的组织和呈深黑色的不规则气孔.三类组织是由在喷涂粒子与基材接触之前,喷涂团聚粉粒经飞行燃烧和反应合成形成的熔融陶瓷液滴(又分为实心和空心两类)和不规则陶瓷颗粒(其形状与原喷涂团聚颗粒一样,但组织结构已发生转变,基本成为陶瓷相)与基材碰撞变形、冷却凝固、快速结晶形成的.
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