摘要
采用大气等离子喷涂 (APS)在GH33基体上制备了氧化锆纳米结构涂层 ,运用X射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电镜 (TEM)和拉曼光谱 (RS)等分析手段对原料粉末和涂层的显微结构、相组成进行了观察和确定 ,分别利用激光脉冲技术测量了热处理前后涂层的热扩散率 .实验结果表明 ,等离子喷涂氧化锆纳米涂层颗粒分布在 65～ 1 1 0nm之间 ,大于原料粉末的 40～ 70nm ,涂层主要由亚稳四方相氧化锆组成 .1 0 5 0℃下热处理 34h后 ,涂层的热扩散率从制备态的 2 .1 5×1 0 -3 ～ 2 75× 1 0 -3 cm2 s升高到 2 .65× 1 0 -3 ～ 3.2 5× 1 0 -3 cm2 s.
Yttria partially stabilized nanostructured zirconia coatings were prepared by atmospheric plasma spraying (APS). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were applied to analyze the nanostructured coatings and that after heat treatment Thermal conductivity were also measured by laser pulsed diffraction method. It was found that the as-sprayed zirconia coating has an average grain size of 67 nm, and mainly composes of metastable tetragonal phase, together with some monoclinic phase and tetragonal phase. The thermal diffusivity of the as-sprayed nanostructured zirconia coating is 2.15×10-3-2.75×10 cm /s between room temperature and 800°C, but 2.65×10-3-3.25×10-3 cm2/s for the coating after heat treatment at 10501 for 34 hours.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2004年第10期949-952,共4页
Journal of Beijing University of Aeronautics and Astronautics
基金
国家自然科学基金资助项目 ( 5 0 1760 0 5 )
关键词
等离子喷涂
涂层
氧化锆
纳米结构
热扩散率
Diffusion
Grain size and shape
Heat treatment
Nanostructured materials
Plasma spraying
Sprayed coatings
Thermal conductivity
Zirconia
