涂覆热障涂层构件的热梯度机械疲劳行为研究

发布时间：2018-06-22 03:09

本文选题：材料表面与界面 + 热障涂层　；参考：《材料研究学报》2017年01期

【摘要】：研究了应变幅、预氧化及高温保载时间对涂覆热障涂层高温合金样品的热梯度机械疲劳性能的影响。结果表明,随应变幅增大,样品疲劳寿命降低。随着预氧化及高温保载时间的增加,样品的氧化损伤增大,疲劳寿命也不断降低。试验过程中,粘结层氧化形成的热生长氧化物层(TGO层)破裂而萌生裂纹,裂纹沿粘结层/TGO层界面扩展而形成分层裂纹,分层裂纹与陶瓷层内贯穿裂纹连接导致陶瓷层剥落而失效。考虑到热障涂层内最大应力及氧化损伤,建立了一个涂覆热障涂层高温合金样品的热梯度机械疲劳寿命预测模型。
[Abstract]:The effects of strain amplitude, preoxidation and high temperature loading time on the thermal gradient mechanical fatigue properties of superalloy samples coated with thermal barrier coating were investigated. The results show that the fatigue life decreases with the increase of strain amplitude. With the increase of preoxidation and high temperature loading time, the oxidation damage increases and the fatigue life decreases. During the test, the thermal growth oxide layer (TGO) formed by the oxidation of the bond layer ruptured, and the crack propagated along the interface of the bond layer / TGO layer to form the delamination crack. The connection between delamination crack and penetrating crack in ceramic layer leads to the spalling and failure of ceramic layer. Considering the maximum stress and oxidation damage in thermal barrier coating, a thermal gradient mechanical fatigue life prediction model for superalloy samples coated with thermal barrier coating is established.
【作者单位】：广东电网有限责任公司电力科学研究院;西门子中国研究院;清华大学摩擦学国家重点实验室微纳制造分室;
【基金】：南方电网科研项目(KGD2014-0595)~~
【分类号】：TG174.4

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