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Influence of Pores and Cracks Morphology on Mechanical Behavior of Thermally Sprayed Ceramics

机译：孔和裂纹形态对热喷涂陶瓷力学行为的影响

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摘要

Pores and cracks have significant influence on the structural rigidity and mechanical behavior of the thermally sprayed materials. For some applications dense coatings are needed, while for others (e.g. thermal barriers) some level of porosity is desirable. Recent development in thermal spraying focuses on the tailored design of pores and cracks for specific applications. In this project, ceramic coatings with different level and morphology of pores and cracks were plasma and HVOF sprayed on titanium alloy substrates. Coating microstructures were observed using scanning electron microscopy. Mechanical behavior of the prepared coatings was evaluated using four-point bending test in terms of changing coating stiffness with increasing mechanical load both in compression and tension. Significant level of coating nonlinearity and hysteresis were observed. Tests carried out for coatings with the same chemical composition but different microstructure proved strong dependency of coatings mechanical properties on pores and cracks morphology. Microstructure features relevant for the applied loading are discussed.
机译：毛孔和裂纹对热喷涂材料的结构刚度和机械性能有重大影响。对于某些应用，需要致密的涂层，而对于其他应用（例如，热障），则需要一定程度的孔隙率。热喷涂的最新发展集中于针对特定应用的孔和缝隙的定制设计。在该项目中，对等离子和HVOF喷涂具有不同程度和形态的孔和裂纹的陶瓷涂层，并将其喷涂在钛合金基底上。使用扫描电子显微镜观察涂层的微观结构。使用四点弯曲试验评估制备的涂层的机械性能，该试验是通过改变压缩和拉伸中的机械负荷来改变涂层的刚度。观察到显着水平的涂层非线性和磁滞现象。对具有相同化学成分但微观结构不同的涂层进行的测试证明，涂层机械性能对孔和裂纹形态的强烈依赖性。讨论了与所施加载荷有关的微观结构特征。

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