The adhesion of thermal barrier coatings (TBC) has been studied using the standard method described in ASTM C633, which makes use of a tensile test machine to measure the adhesion. The studied specimens consist of air plasma sprayed (APS) TBC deposited on disc-shaped substrate coupons of Ni-base alloy Hastelloy X. The bond coat (BC) is of a NiCoCrAlY type and the top coat (TC) consists of yttria–stabilised–zirconia. Before the adhesion test, the specimens were subjected to three different heat treatments: 1) isothermal oxidation at 1100 °C up to 290 h, 2) thermal cycling fatigue (TCF) at 1100 °C up to 300 cycles and 3) thermal shock at ~ 1140 °C BC/TC interface temperature up to 1150 cycles. The adhesion of the specimens is reported and accompanied by a microstructural study of the BC and the thermally grown oxides (TGO), as well as a discussion on the influence of BC/TC interfacial damage on adhesion properties of TBC. The adhesion was found to vary with heat treatment, as well as with heat treatment length.
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机译:已经使用ASTM C633中描述的标准方法研究了热障涂层(TBC)的附着力,该方法利用拉伸试验机测量附着力。所研究的样品由空气等离子喷涂(APS)TBC组成,该TBC沉积在镍基合金Hastelloy X的圆盘形基片上。粘结涂层(BC)为NiCoCrAlY型,面涂层(TC)由稳定的氧化钇组成–氧化锆。在附着力测试之前,对样品进行三种不同的热处理:1)在1100°C下进行长达290小时的等温氧化; 2)在1100°C下进行300次循环的热循环疲劳(TCF);以及3)在1100°C进行的热冲击〜1140°C BC / TC界面温度高达1150个循环。报告了样品的粘附性,并伴随着BC和热生长氧化物(TGO)的微观结构研究,以及BC / TC界面损伤对TBC粘附性能的影响的讨论。发现粘附力随热处理以及热处理长度而变化。
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