较长时间高温氧化,会使金属粘结层与热生长氧化物界面处贫铝,造成热喷涂陶瓷层失效.对金属粘结层进行超音速微粒轰击,可以增加铝扩散的浓度梯度,提高热障涂层的抗氧化能力.采用等离子喷涂(APS)在镍基高温合金GH99上制备了热障涂层,并对粘结层进行了超音速微粒轰击处理,研究了该处理工艺对粘结层显微结构及高温氧化行为的影响.结果表明:APS热障涂层经1 050 ℃、96 h氧化后.热生长氧化物层产生大量非保护性混合氧化物;超音速微粒轰击工艺使粘结层表层区域产生大量位错等缺陷,涂层经1 050 ℃、3 h氧化后进入稳态氧化期,同时出现Al在粘结层表层的富集,经1 050 ℃、196 h氧化后粘结层无加速氧化趋势,热障涂层的抗高温氧化性能得到提高.
was prepared on Ni- based high- temperature alloy GH99 by at-mospheric plasma spraying (APS). The bonded coating was trea-ted by supersonic fine particle bombarding, which was carded out in relation to the effect on the microstructure and oxidation behav-ior of the TBC. It was found that a thermally grown oxide (TGO) layer composed of detrimental oxides was formed in APS- TBC specimens after 96 h thermal exposure at 1 050 ℃. After treating the bonded coating by supersonic fine particle bombarding, large quantities of dislocations were generated in the thermal barrier coating. In this case the coating reached steady- state oxidation after thermal exposure at 1 050 ℃ for 3 h, and Al was enriched atop the bonded coating. Subsequently, even after 196 h thermal exposure at 1 050 ℃, the bonded coating still retained steady-state oxidation, implying that the high temperature antioxidation behavior of the thermal barrier coating was effectively increased.
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