The formation of thermally grown oxide (TGO), which is composed of alumina and mixed oxides, leads to the delamination of thermal barrier coating (TBC). In this study, to improve the oxidation resistance and adhesion strength of TBCs, grinding and grit-blasting treatments with alumina grits were applied to the surface of the bond-coat (BC) before deposition of the top-coat (TC). These treatments are expected to pre-form an alumina layer as an oxidation barrier and also optimize the TC/BC interfacial roughness. A high-temperature exposure test of TBC specimens grit-blasted with alumina grits of different sizes (B-TBC) revealed the growth of a continuous alumina layer in the B-TBC specimens in contrast to the formation of a complex TGO with alumina and mixed oxides in non-blasted TBC (S-TBC). Moreover, the area and thickness of TGO in the B-TBC specimens were much lower than those in the S-TBC. An indentation test was conducted to evaluate the TC/BC interfacial fracture toughness KIFC which confirmed a significantly higher KIFC of the B-TBC specimens than that of the S-TBC specimen. These results demonstrated that the grinding and grit-blasting treatments are effective in improving the oxidation resistance and adhesion strength of the TBC system.

中文翻译：

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通过研磨和喷砂处理提高热障涂层的抗氧化性和附着力

由氧化铝和混合氧化物组成的热生长氧化物 (TGO) 的形成导致热障涂层 (TBC) 分层。在这项研究中，为了提高 TBC 的抗氧化性和附着强度，在沉积面漆 (TC) 之前，将氧化铝磨粒研磨和喷砂处理应用于粘合涂层 (BC) 的表面。预计这些处理将预先形成氧化铝层作为氧化屏障，并优化 TC/BC 界面粗糙度。用不同尺寸的氧化铝砂粒 (B-TBC) 喷砂的 TBC 试样的高温暴露试验显示，与氧化铝和混合的复合 TGO 形成的复杂 TGO 形成对比，B-TBC 试样中连续氧化铝层的生长非喷砂 TBC (S-TBC) 中的氧化物。而且，B-TBC 试样中 TGO 的面积和厚度远低于 S-TBC。进行压痕试验以评估 TC/BC 界面断裂韧性 KIFC，证实 B-TBC 试样的 KIFC 显着高于 S-TBC 试样的 KIFC。这些结果表明，研磨和喷砂处理可有效提高 TBC 体系的抗氧化性和附着强度。