空气等离子喷涂制作陶瓷涂层的参数控制

中文字数:3161,中文页数:09 英文字数:3197页数:21

摘要 
 在不锈钢板上喷涂热障涂层的空气等离子热喷涂技术。通过控制不同的喷涂工艺参数，能得到各种不同孔隙度的涂层。三种类型的热冲击试验的目的是测定热障涂层寿命，及不同喷涂工艺参数对热障涂层寿命的影响。在热冲击实验中，喷涂距离是一个重要参数。经研究，热冲击性能可与实际参数称为临界热震参数 。断裂韧性可通过Vicker的压痕技术测定，而且在一定孔隙度范围内韧性随孔隙度的增加而增加。因此残余应力和断裂韧性的提高可能在一定范围内能增加热障涂层的寿命。
关键词 热障涂层 热冲击 断裂韧性 空气等离子喷涂

Abstract  Thermal barrier coatings (TBCs) were sprayed on stainless steel coupons by an air plasma thermal spray (APS) technique. The porosity of the topcoat was varied by controlling the different spraying parameters. Three types of thermal shock tests were designed to determine the TBCs life. Effect  of different spraying parameters on the thermal shock life was
observed. The spraying distance was found to be an important parameter that controls the thermal shock life. It was observed that the thermal shock properties could be related with an empirical parameter called the critical thermal shock parameter (CTSP). Fracture toughness (KIC) was determined by Vicker’s indentation technique and it was observed that for a certain range of the porosity the toughness increased with increase of porosity. The possible increase in thermal shock life for a certain range of CTSP may be attributed to residual stresses and increase in fracture toughness of the topcoat.
Keywords:  Thermal barrier coating   Thermal shock   Fracture

 《空气等离子喷涂制作陶瓷涂层的参数控制》WORD格式全文下载链接