摘要
研究了几种等离子喷涂陶瓷（Ａｌ＿２Ｏ＿３、Ａｌ＿２Ｏ＿３－ＴｉＯ＿２、Ｃｒ＿２Ｏ＿３和ＺｒＯ＿２）涂层的固体粒子冲蚀磨损特性及其冲蚀磨损机理，同时根据冲蚀磨损表面形貌特征的扫描电子显微镜观察，并且从准静态压印断裂分析入手，提出了这类陶瓷涂层在固体粒子于较低速度和较小角度冲击下的冲蚀磨损数学模型（试验选用的粒子冲击速度有３０ｍ／ｓ和７０ｍ／ｓ的两种，冲击角度为３０°）．研究结果表明，固体粒子冲击压印断裂－层状剥落是这类陶瓷涂层的主要冲蚀磨损机理。根据所提出的模型得到涂层的体积冲蚀磨损率Ｅｖ与其硬度ＨＶ呈反比关系（即Ｅｖ∝ＨＶ－１），这与试验结果相符；由该模型推导出涂层的Ｅｖ之速度指数ｎ＝２．１，这与试验结果基本相符。按照这种模型，对于固体粒子以较低速度和较小角度冲击的情况，高硬度的陶瓷涂层具有较高的冲蚀磨损抗力；通过改善陶瓷涂层的断裂韧性，可以有效地提高其在正向冲击时的冲蚀磨损抗力。
The impact-erosion wear characteristics and erosion-wear mechanism of plasma sprayceramic coatings(Al2O3,Al2O3-TiO2,Cr2O3 and ZrO2) by solid particles was studied in this paper.Under the low impact velocity(30m/s or 70m/s) and small impact angle(30°),the authors putforward a mathematic model of impact-erosion based on the SEM observation results of the erodedsurface profile and the analysis on the quasi-static indentation-fracture. The main results are asfollows:a. The impact erosion of the plasma spray ceramic coatings is resulted from the impressrupturing-layered spalling.b.According to this model the volume impact erosion wear rate Ev is in inverse proportion toits hardness(HV),this is consistent with test results.c.It is deduced from this model that the velocity index n of the volume impact-erosion rate isequal to 2.1,this is approximate in accordance with the test results.d.The impact-erosion wear resistance can be effectively increased by means of improvingthe fracture toughness of ceramic coatings under the normal impact,according to this model.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
1994年第1期57-64,共8页
Tribology
关键词
等离子喷涂
陶瓷涂层
冲蚀磨损
plasma spray coating,ceramic coating impact-ercaion wear,mathematic model for impact-erosion wear by solid particles
