Magnéli phases TiO_2−x have many excellent physical and chemical properties. While the preparation process of TiO_2−x is costly and complicated. In situ synthesis of TiO_2−x by deoxidation of TiO₂ powders coupled with the deposition of the TiO_2−x coating synchronously using plasma spraying can broaden the prospects in many industrial applications. This study attempts to relate the comprehensive properties of plasma-sprayed TiO_2−x coating to phase and microstructural variances induced by deoxidation of the mixing nano-(n-TiO₂) and submicron (m-TiO₂) sprayable feedstocks. The phase constitution, microstructure, and micromechanical properties of the as-sprayed TiO_2−x coatings are experimentally and systemically investigated. With the increase in m-TiO₂ particles, more rutile phase transfers into Magnéli phases during coating preparation. The microstructure of coatings is mainly composed of two meta structures, including the fully melted region and the partially melted region. The measured data of the porosity, microhardness, elastic modulus, and fracture toughness follow Weibull distribution, and the micromechanical properties present a characteristic of bimodal distribution. With increasing m-TiO₂ particles, the microhardness and elastic modulus of coatings decrease, whereas the fracture toughness greatly increases. In general, the comprehensive properties of the as-sprayed TiO_2−x coating can be effectively improved by optimizing the feedstock structure and composition.

Magnéli 相 TiO _{2- x}具有许多优异的物理和化学性质。而TiO _{2- x}的制备过程成本高且复杂。_{通过对 TiO 2}粉末进行脱氧以及使用等离子喷涂同步沉积 TiO _{2- x}涂层来原位合成 TiO _{2- x}可以拓宽许多工业应用的前景。本研究试图将等离子喷涂 TiO _{2- x涂层的综合性能与由混合纳米 (n-TiO 2} ) 和亚微米 (m-TiO ₂ )脱氧引起的相和微观结构变化联系起来。) 可喷雾的原料。_{实验和系统地研究了喷涂后的TiO 2- x}涂层的相组成、微观结构和微机械性能。随着 m-TiO ₂颗粒的增加，更多的金红石相在涂层制备过程中转移到 Magnéli 相中。涂层的微观结构主要由两种超结构组成，包括完全熔化区和部分熔化区。孔隙率、显微硬度、弹性模量和断裂韧性的实测数据服从威布尔分布，显微力学性能呈现双峰分布特征。随着 m-TiO _2的增加颗粒，涂层的显微硬度和弹性模量降低，而断裂韧性大大增加。一般来说，通过优化原料结构和组成，可以有效提高喷涂态TiO _{2- x涂层的综合性能。}