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                热喷涂工艺

                热喷涂工艺

                  热喷涂是近代各种喷涂、喷熔(或称喷焊)工艺↓的总称。它是把№丝状或粉末状材料加热到近熔化或熔化状态,并使之雾化、加速;最后喷至零件表↑面形成覆盖层的工艺。热喷涂工艺既是『一种表面强化工艺,也是⌒ 一种修复工艺。
                  涂层的形成原理:喷滁时,首先是喷涂材料被加热达到熔化或半熔化状态;紧接着是♀熔滴雾化阶段;然后是被气流或热源射流推动向前喷射的飞行阶段:最后以一定的动能冲击基体表〗面,产生强烈碰撞展平成扁平状涂层并瞬间凝固。在凝固冷却的0.1 s中,此扁平状涂层继续受环境和热气流影响。每隔0 1 s第二层薄片形成,通过已形成的薄片向基体或涂层进行热传导,逐渐形成层状结构的涂层。