目的 开发NiAl金属间化合物热障涂层粘结层.方法 通过机械合金化技术制备了Ni/Al、Ni/Al+0.5％ZrC与Ni/Al+0.07％三-种复合结构粉末.采用冷喷涂在镍基高温合金(IN738)基体上制备Ni/Al、Ni/Al+0.5％ZrC与Ni/Al+0.07％三种复合涂层,然后在保护气氛Ar气中进行热扩散制备这三种金属间化合物涂层.结果 低温球磨8h后可以获得具有亚微米层状结构的Ni/Al+ZrC复合结构粉末.喷涂态Ni/Al合金复合涂层保留了粉末的结构,经1080℃保温10h后,形成了致密的NiA1金属间化合物涂层.结论 掺杂ZrC(0.07％和0.5％)的Ni/Al粉末在球磨后比未掺杂ZrC的粉末更均匀.掺杂ZrC的粉末形成了部分NiAl金属间化合物,而没有掺杂ZrC的粉末则无NiA1金属间化合物形成.冷喷涂可以制备几乎无氧化Ni/A1粉末粘结层.热处理后原喷涂态涂层中的亚微米的层状结构已基本消失,变成了较为均匀的组织.
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