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Development of ceramic composite coatings with titania nanofibers

机译：二氧化钛纳米纤维陶瓷复合涂料的开发

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摘要

In recent years, nano alumina/titania ceramic composite coatings have been investigated and exhibited very attractive properties in several mechanical applications such as wear resistance. One of the reasons for significant improvement of those coatings properties is considered to be "nanostructure" preserved in the coating during depositions. Thus, it is of interest to introduce nanostructure with high aspect ratio into coatings and to investigate the effects on the coating properties, especially fracture properties. In this study, alumina/titania composite powders were fabricated by spray dry procedure, which consist of the alumina nano particle (～50 nm) and the titania nano fibers (diameter 100～200 nm, length 2～3μm). The developed powders were sprayed by APS process. The deposited coatings contain fibrous titania structures which were not melted during deposition. Fracture resistance was evaluated as a function of a crack length by Double Cantilever Beam (DCB) Test for the coatings fabricated under various spray conditions and corresponded to the microstructure.
机译：近年来，已经研究了纳米氧化铝/二氧化钛陶瓷复合涂层，并在几种机械应用中表现出非常有吸引力的性能，例如耐磨性。那些涂层性能显着改善的原因之一被认为是在沉积过程中保留在涂层中的“纳米结构”。因此，令人感兴趣的是将具有高纵横比的纳米结构引入涂层中并研究对涂层性能特别是断裂性能的影响。本研究采用喷雾干燥法制备了氧化铝/二氧化钛复合粉体，该复合粉体由氧化铝纳米粒子（〜50 nm）和二氧化钛纳米纤维（直径100〜200 nm，长度2〜3μm）组成。显影后的粉末通过APS工艺喷涂。沉积的涂层包含纤维状的二氧化钛结构，该结构在沉积过程中不会熔化。通过双悬臂梁（DCB）测试，评估了在各种喷涂条件下制造的涂层的抗裂强度与裂纹长度的关系，并与微观结构相对应。

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