摘要
利用大气等离子喷涂技术和纳米粉体造粒料,制备了3mol%Y2O3部分稳定ZrO2热障涂层.利用扫描电镜(SEM)、透射电镜(TEM)研究了涂层的显微结构,采用差示扫描量热仪(DSC)、激光脉冲法热导仪对涂层的热物理性能进行了实验研究和理论分析.结果表明:利用纳米粉体造粒料和等离子喷涂技术可获得导热系数为0.63～0.80W/(m·K)的热障涂层.原因在于涂层显微结构中大量分布均匀的微小气孔和平均长度在十几微米的、垂直于热流方向的层状微裂纹.相变可导致涂层热物性变化异常.热处理后涂层的晶粒长大和气孔率降低可导致导热系数升高。
ZrO2-3mol% Y2O3 coating was deposited by air plasma spraying using reconstituted nanosize particles.The microstructure was examined by SEM and TEM.The thermal conductivity was calculated based on the specific heat and thermal diffusivity detected by DSC and laser flash method.The results show that the thermal barrier zirconia coating with thermal conductivity ranging from 0.63-0.80 W/（m·K） is obtained.This can be attributed to the homogeneous distribution of micro-size pores and amounts of micro-cracks with average length of about 10 μm,to which heat flow is nearly perpendicular.The phase transition of t to m can result in the change of thermophysical properties.The grain growth and the decrease of porosity lead to increase of thermal conductiviy of as-sprayed coating.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第7期695-699,共5页
Journal of Inorganic Materials
基金
Chine-France PRA dans ledomaine des mat é riaux 2002 under grant PRA MX02-03(C.Coddet&C.Ding)
关键词
纳米粉体
等离子喷涂
氧化锆涂层
热物理性能
nanosize particle
air plasma spraying
zirconia coating
thermophysical properties
