目的 分析喷距对钛涂层显微结构和性能的影响.方法 采用低温超音速火焰喷涂工艺,在不同的喷距下制备钛涂层,分析钛涂层的显微组织、相结构及显微硬度,探讨涂层受喷距影响的机制.结果 低温超音速火焰喷涂钛涂层的表面粗糙度较高,涂层的孔隙率随喷距的增加呈先减小、后增大的趋势,当喷距为150 mm时,涂层的孔隙率最小.钛涂层没有发生明显的氧化,粒子主要以固态形式沉积.结论 当喷距为150 mm时,粒子在焰流中加热较为充分,同时具有较高的飞行速度,粒子的扁平化程度高,因此涂层具有较高的致密度.
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