期刊
JOURNAL OF THERMAL SPRAY TECHNOLOGY
卷 30, 期 1-2, 页码 424-441出版社
SPRINGER
DOI: 10.1007/s11666-020-01124-4
关键词
thermal barrier coating (TBC); thermally grown oxide (TGO); isothermal oxidation; solid particle erosion; crack
资金
- Natural Science & Engineering Research Council of Canada (NSERC)
- Defense Technology and Sustainment Program of National Research Council Canada
- Kennametal Stellite Inc.
The study investigates the high-temperature oxidation and solid particle erosion of a thermal barrier coating (TBC) system. Results show that TGO growth leads to the spallation of the top coat during isothermal oxidation, while the erosion rate of the top coat increases with impingement angle.
The high-temperature oxidation and solid particle erosion of thermal barrier coating (TBC) system which consists of a 8 wt.% yttria-partially stabilized zirconia (YSZ) top coat and CoNiCrAlY bond coat deposited on Inconel 718 substrate via air plasma spraying (APS) process are studied experimentally. Isothermal oxidation tests of the APS-TBCs are conducted at 1050, 1100 and 1150 degrees C in air for up to 1970 h. Solid particle erosion tests are also performed on both as-deposited and heat-treated APS-TBC specimens at selected particle impingement angles and velocities in room temperature. The scanning electron microscopy (SEM) analyses of the cross sections of the APS-TBC specimens after the oxidation tests show the formation of thermally grown oxide (TGO) scale due to the oxidation of CoNiCrAlY bond coat, and the oxidation kinetics of TGO growth is described by the parabolic rate equation. The failure of the APS-TBC system under isothermal oxidation is associated with the spallation of the top coat through propagation and coalescence of cracks along the coating interface, which is affected by the TGO growth. The solid particle erosion rate of the top coat is found to increase with impingement angle and reach the maximum erosion rate at normal impingement of particles. The erosion resistance of the APS-TBC is observed to increase after the APS-TBC specimen has been exposed at 1100 and 1150 degrees C for 72 h, probably due to the sintering effect on the top coat, which results in reduction of top coat porosity.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据