超高温陶瓷固溶体(Zr,Ta)B2改性硅基涂层具有巨大的潜在应用价值，双重过渡族金属离子的多变性共存使其应用呈现出不确定性，为了充分发挥其改性效果，研究其协同效应机理，本研究拟结合液相法合成粉体与涂刷法制备涂层技术，通过对 (Zr,Ta)B2固溶度及微观结构的控制，研究其改性机理。采用液相法合成超细(Zr,Ta)B2粉体，研究反应条件对其固溶度、粒度及形貌的影响，探索其最佳合成工艺及机理；以可控(Zr,Ta)B2为原料，采用涂刷法在碳材料表面制备改性硅基涂层，探索涂刷工艺、粉体粒度及形貌对涂层相界面、微观结构及氧化抗性的影响；研究在多重氧化环境下，(Zr,Ta)B2固溶度及其含量对涂层氧化防护效果、复相玻璃层的成分及氧化防护能力的影响，揭示(Zr,Ta)B2相双重过渡族金属离子在多重氧化环境下的协同效应机理，有效提升单相UHTCs硼化物改性硅基涂层在多重氧化环境下对碳材料的氧化防护效果。

Ultra high temperature ceramic solid solution (Zr,Ta)B2 modified silica based coatings own great potential application value, the variable coexistence of double transition metal ions makes its application uncertainty. To fully play the effect of modification and study the mechanism of the synergistic effect, the liquid phase synthesis of powder and brushing method to prepare coating technology will be combined, and the oxidation protection mechanism of the modified silica based coating under multiple oxidation environment will be investigated through controlling the microstructure of (Zr,Ta)B2. Ultrafine (Zr,Ta)B2 powders will be synthesized by liquid phase method, then the effects of reaction conditions on its solid solubility, particle size and morphology will be studied, and the best synthetic process and mechanism will be also explored. The silicon based coating modified by ultrafine (Zr,Ta)B2 will be prepared on the surface of carbon materials by brushing process, then the effects of brushing process, particle size and morphology of the powders on phase interface and microstructure of the coatings will be explored, the effects of modified phase interface changes on oxidation resistance of coatings will also be studied. In addition, the effects of solid solubility and content of (Zr,Ta)B2 powders will be studied on oxidation resistance of coatings, as well as composition, formation process and oxidation protection ability of multiphase glass layers. Finally, the synergistic effect of dual transition metal cations in multiphase glass layer will be revealed.