摘要
低压等离子喷涂纳米氧化锆热障涂层,具有独特的组织结构。纳米团聚颗粒在高温等离子射流中部分熔化后沉积到基体上,团聚颗粒能够保留部分纳米结构,形成一种以纳米晶为主的纳米-微米二元结构涂层,为热障涂层的制备提供了一种新的技术方案。YSZ涂层高温服役中,纳米晶粒容易烧结长大。本文通过向YSZ粉体中加入少量的纳米α-Al_2O_3,探讨其抑制YSZ热生长的机制。首先制备了YSZ-Al_2O_3纳米混合物团聚粉末,并借助低压等离子喷涂技术制备涂层。结果表明纳米晶区占主导地位,纳米晶区嵌有少量的微米晶粒。涂层经1400℃,10h热处理,微观组织结构分析表明,α-Al_2O_3的加入对YSZ晶粒热生长具有部分抑制作用。
The nanostructured yttria stabilized zirconia(YSZ)ceramic coatings deposited by low pressureplasma spraying technology can be applied to the thermal barrier coatings,which has special microstructure.The agglomerated nanostructured particles partially melted in the high temperature plasma jet can bedeposited on the substrate,partially retaining its original narostructured size.Meanwhile,there is a micronano-sized grains biomodal structure coatings formed.The presence of such a nanostructured coatingprovides us a very new and useful technological solution to improve the functional properties of thecomponents.What has been done in this study are puting a slight content ofα-Al2O3into YSZ powder andfinishing the reconstitution YSZ-Al2O3nano-particles mixture into nanostructured powders and successfullydeposited YSZ-Al2O3nanostructured coating by vaccum plasma spray technology on a substrate,attemptingto explore the actual inhibition effect of Al2O3for the growth of YSZ.The heat treatment was employed tothe as-sprayed coating at1400℃for10h.By means of the modern analysis intrusments such as scanningelectron microscopy(SEM),compared with the original deposited coating,the partial inhibition effect ofα-Al2O3on YSZ grain growth after heat treatment was investigated.
作者
高朝卿
刘洪军
刘久成
熊璇玥
高阳
GAO Chao-qing;LIU Hong-jun;LIU Jiu-cheng;XIONG Xuan-yue;GAO Yang(The research center of thermal spraying technology, Dalian Maritime University, Dalian 116026, China)
出处
《热喷涂技术》
2016年第3期43-50,共8页
Thermal Spray Technology
