沈艳芳,宋婉,崔新宇,熊天英,李铁藩.溶胶 - 凝胶法制备 TiO2 及其冷喷涂性能研究[J].热喷涂技术,2020,12(4):45~52.
溶胶 - 凝胶法制备 TiO2 及其冷喷涂性能研究
The Cold Spraying Performance of TiO2 Prepared by Sol-gel Method
  
DOI:10.3969/j.issn.1674-7127.2020.04.006
中文关键词:  冷喷涂  陶瓷涂层  TiO2  溶胶 - 凝胶  粉末
英文关键词:Cold spray  Ceramic coatings  TiO2  Sol-gel  Powders
基金项目:
              
作者单位
沈艳芳 中国科学院金属研究所
宋婉 中国科学院金属研究所
崔新宇 中国科学院金属研究所
熊天英 中国科学院金属研究所
李铁藩 中国科学院金属研究所
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中文摘要:
      冷喷涂陶瓷涂层的现有研究表明, 大部分商业陶瓷粉末不适合用于冷喷涂, 而实验室制备的纳米团聚粉末 更易于冷喷涂。 溶胶 - 凝胶法是制备纳米 TiO2 最常用的方法之一, 具有工艺简单、 重复性高、 反应易控制等优点, 而且可以通过实验参数的改变从分子水平对反应进行控制, 从而获得结构形态各异的纳米粒子。 本文采用基于钛 酸四正丁酯水解反应的溶胶-凝胶法制备纳米锐钛矿TiO2, 研究粉末的微观结构并考察其冷喷涂性能, 在此基础上, 分析原料粉末性能对其冷喷涂性能的影响。 研究结果表明, 与商业 TiO2 粉末相比, 溶胶 - 凝胶法制备的 TiO2 粉 末具有良好的冷喷涂工艺适应性。 溶胶 - 凝胶法制备的 TiO2 粉末微观结构为不规则形, 经过热处理后由无定形态 转变为锐钛矿相。 冷喷涂 TiO2 涂层晶体结构及涂层内部 TiO2 颗粒的微观形貌均与溶胶 - 凝胶 TiO2 粉末保持一致。 冷喷涂 TiO2 涂层的光催化活性受原始喷涂粉末影响, 当原始喷涂粉末的光催化活性高时, 冷喷涂 TiO2 涂层的光 催化活性也较高。
英文摘要:
      The existing research on the cold sprayed ceramic coatings indicates that the most commercial ceramic powders cannot be successfully sprayed. Whereas agglomerated nanometer powders prepared in the laboratory can achieve cold sprayed ceramic coating. Sol-gel method is one of the most common used methods to prepare nanosized TiO2. It has the advantages of a simple process, low equipment requirement and simple control of the reactions, etc. In order to obtain the nanoparticles of different structure and morphology, the reactions can be controlled at the molecular level through the change of the experimental parameters. In this paper, nanoanatase TiO2 was prepared by the hydrolysis reaction of tetrabutyl titanate, and its cold spraying performance was investigated. Moreover, the influence of the powder properties on its cold spray performance was analyzed. The results show that TiO2 powders prepared by sol-gel method can be deposited as coatings easier than commercial TiO2 powders by cold spray technology. Sol-gel TiO2 powders exhibit irregular morphology, and transferred to anatase phase after thermal treatment. The crystal phase and micro-morphology of cold sprayed TiO2 coating are the same with sol-gel TiO2 powders. The photocatalytic performance of cold sprayed TiO2 coating is affected by feed powders. The photocatalytic performance of the cold sprayed TiO2 coating has been improved with the increased photocatalytic activity of sol-gel TiO2 powders.
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