Microstructures, phase and mechanical characterisation of Al2O3-ZrO2-TiO2 coating produced by atmospheric plasma spraying

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS Open Ceramics Pub Date : 2024-10-21 DOI:10.1016/j.oceram.2024.100698

Cynthia Sin Ting Chang , Marcus Wyss , Michal Andrzejewski , Geoffrey Darut , Lukas Graf , Vladimir Novak , Margie Olbinado , Susanne Erpel , Alexander Vogel , Simon Bode , Michael de Wild , Armando Salito

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Abstract

The microstructure, crystallographic phases, and mechanical properties of a newly developed Al₂O₃ – TiO₂ – ZrO₂ ternary ceramic coating were characterized. The coatings were produced by atmospheric plasma spraying as a preblended powder on Ti-6Al-4 V substrates using the new generation of the Debye-Larmor cascaded plasma torch. The 400 μm thick as-sprayed ternary ceramic coating is compact and neither delamination nor inter-/trans-granular cracks were found. The coating consists of single phase α-Al₂O₃, monoclinic m-ZrO_2, and a nanocrystalline dual phase structure of α-Al₂O₃ and m-ZrO₂. Ti is either present as ZrTiO₄ or as solute in the dual phase. Cracking from the tip of the indent is rare and delamination was not observed after the progressive scratch test. The coating has potential in high wear applications for example in medical devices.

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大气等离子喷涂法生产的 Al2O3-ZrO2-TiO2 涂层的微结构、相和力学特性

对新开发的 Al2O3 - TiO2 - ZrO2 三元陶瓷涂层的微观结构、晶相和机械性能进行了表征。涂层是使用新一代 Debye-Larmor 级联等离子体喷枪在 Ti-6Al-4 V 基底上通过大气等离子体喷涂预混合粉末制得的。喷涂厚度为 400 μm 的三元陶瓷涂层非常致密，既未发现分层，也未发现晶间/晶间裂纹。涂层由单相 α-Al2O3、单斜 m-ZrO2 以及 α-Al2O3 和 m-ZrO2 的纳米晶双相结构组成。钛要么以 ZrTiO4 的形式存在，要么作为溶质存在于双相中。在渐进式划痕测试后，很少出现从压痕尖端开裂的情况，也未观察到分层现象。这种涂层具有高磨损应用的潜力，例如在医疗设备中的应用。

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