【摘 要】
：
为改善催化剂中γ-Al2O3分散层与FeCrAl基体的结合力,采用等离子喷涂技术在合金表面制备了NiCrAl/ZrO2混合涂层作为过渡层.利用X射线衍射仪、扫描电镜和电子探针仪,研究了1 0
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为改善催化剂中γ-Al2O3分散层与FeCrAl基体的结合力,采用等离子喷涂技术在合金表面制备了NiCrAl/ZrO2混合涂层作为过渡层.利用X射线衍射仪、扫描电镜和电子探针仪,研究了1 073 K氧化后过渡层的变化,并考察了超声振动和热冲击后涂层的剥落情况.结果表明,过渡层表面相主要是Ni和ZrO2; 内部组织包括喷涂材料层、氧化物夹杂、孔洞及未熔融颗粒; 与基体为冶金结合.随着高温氧化时间增加,过渡层表面NiO晶粒增多并长大; 内部发生了合金元素互扩散; 界面处Ni, Al含量明显增加.这种表面预处理形成了粗糙多孔的过渡层,提高了氧化铝分散层与金属基体的粘结力,并缓解了界面处的热应力.
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