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首页> 外文期刊>JCT research >Thermal failure of thermal barrier coating with thermal sprayed bond coating on titanium alloy
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Thermal failure of thermal barrier coating with thermal sprayed bond coating on titanium alloy

机译：钛合金热喷涂粘结涂层的热障涂层的热失效

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摘要

A thermal spray technology high-velocity oxygen fuel (HVOF) was used to deposit NiCoCrAlY as a bond coating between the titanium alloy substrate and top 8 wt% yttria-stabilized zirconia thermal-barrier coating (TBC) deposited by electron beam-physical vapor deposition (EB-PVD). The thermal cycling and isothermal exposure tests were conducted to evaluate the durability of the TBC, Investigations using OM, SEM, EPMA, and XRD revealed that the thermal-sprayed BC makes the TBC more durable in isothermal exposure tests but more short-lived in thermal cycling tests, in comparison to our previous study in which the BC was prepared by EB-PVD. This is because the thermal-sprayed imperfections, such as microcracks and voids, elevate the diffusion resistance and degrade the mechanical properties of the BC, simultaneously. To current TBC systems in which the BC is deposited by HVOF, thermal failure behaviors-such as the formation of the Ti/Al mixture oxides at some individual places in the BC, and the Ti_2Ni gaps formed around the BC/substrate interface-were also discussed.
机译：使用热喷涂技术高速氧气燃料（HVOF）沉积NiCoCrAlY作为钛合金基底和通过电子束物理气相沉积法沉积的顶部8 wt％的氧化钇稳定的氧化锆热障涂层（TBC）之间的粘结涂层（EB-PVD）。进行了热循环和等温暴露测试以评估TBC的耐久性。使用OM，SEM，EPMA和XRD进行的调查显示，热喷涂BC使TBC在等温暴露测试中更耐用，但在热环境中寿命更短自行车测试，与我们之前由EB-PVD准备BC的研究相比。这是因为热喷涂缺陷（例如微裂纹和空隙）同时提高了扩散阻力并降低了BC的机械性能。对于当前的通过HVOF沉积BC的TBC系统，还出现了热失效行为，例如在BC中某些位置处形成了Ti / Al混合氧化物，以及在BC /基板界面周围形成了Ti_2Ni间隙。讨论过。

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