Thermal barrier coating (TBC) with Al₂O₃ and 8YSZ as topcoat constituents has been developed. The commercially available 8YSZ (80% wt.), Al₂O₃ (17 and 19% wt.) and multiwall carbon nanotubes (MWCNT) (3% and 1% wt.) were plasma sprayed to produce composite coatings. A stress relaxation technique using a slow-speed diamond cutter has been used to relax the strain and determine the through-thickness residual stress in the coatings. A 3D finite element model was developed, the model was experimentally validated, and the model was used to establish a relationship between applied stress and relaxed strain. The addition of alumina increased the compressive residual stress on the surface of the coating by 42%, the addition of 1% MWCNT had a negligible effect on the residual stress on the coating surface. The further addition of MWCNT (3% wt.) resulted in tensile residual stress in the coating as a result of MWCNT agglomeration.

中文翻译：

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空气等离子喷涂MWCNT增强的8YSZ-氧化铝复合涂层中的残余应力估算

已经开发了以Al ₂ O ₃和8YSZ作为面漆成分的隔热涂层（TBC）。市售的8YSZ（80％wt。），Al ₂ O ₃等离子喷涂（17和19％重量）和多壁碳纳米管（MWCNT）（3％和1％重量）以产生复合涂层。使用慢速金刚石切割机的应力松弛技术已用于松弛应变并确定涂层中的整个厚度残余应力。开发了3D有限元模型，对模型进行了实验验证，并使用该模型建立了施加应力与松弛应变之间的关系。氧化铝的加入使涂层表面的压缩残余应力增加了42％，1％MWCNT的加入对涂层表面的残余应力的影响可忽略不计。由于MWCNT附聚，进一步添加MWCNT（3重量％）导致涂层中的拉伸残余应力。