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首页> 外文会议>2003 International Thermal Spray Conference Vol.1; May 5-8, 2003; Orlando, Florida, USA >Photocatalytic Decomposition of Ammonia by Thermal Sprayed TiO_2 Coatings
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Photocatalytic Decomposition of Ammonia by Thermal Sprayed TiO_2 Coatings

机译：热喷涂TiO_2涂层对氨的光催化分解

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摘要

TiO_2 coatings were prepared by plasma and HVOF spray using agglomerated sub-micron TiO_2 powder. Effects of various spray conditions on microstructure, phase ratio, coating thickness have been investigated and then photo-catalytic properties was evaluated. It was found that anatase phase ratio decreased gradually with increasing arc current in the plasma spray process, while higher anatase ratio (approximately 50%) was obtained in the HVOF process. The coating thickness increased with increasing arc current and displayed approximately 50mm thickness in the case of 800A although anatase ratio was lower. Thus, the anatase phase ratio and coating thickness exhibited strong dependency on thermal spray method and spray conditions (arc current and fuel gas pressure). The sprayed coatings using sub-micron powder feed showed photo-catalytic decomposition of gaseous NH_3. As a result of photo-catalytic experiments, TiO_2 coating formed by HVOF spraying showed higher decomposition rate because coating by HVOF showed high anatase ratio. And, moreover, the TiO_2 coating by plasma spray technique also exhibited photo-catalytic decomposition of gaseous NH_3 although anatase ratio was lower in comparison with HVOF in present study.
机译：使用团聚的亚微米TiO_2粉末通过等离子和HVOF喷涂制备TiO_2涂层。研究了各种喷涂条件对微观结构，相比，涂层厚度的影响，然后评估了光催化性能。发现在等离子体喷涂过程中，锐钛矿相比随着电弧电流的增加而逐渐减小，而在HVOF工艺中获得了更高的锐钛矿比（约50％）。尽管锐钛矿比较低，但随着电弧电流的增加，涂层厚度增加，在800A的情况下，涂层厚度约为50mm。因此，锐钛矿相比和涂层厚度表现出对热喷涂方法和喷涂条件（电弧电流和燃料气体压力）的强烈依赖性。使用亚微米粉末进料的喷涂涂层显示出气态NH_3的光催化分解。作为光催化实验的结果，通过HVOF喷涂形成的TiO_2涂层显示出更高的分解速率，因为通过HVOF涂层显示出高的锐钛矿比。而且，尽管与本研究相比，锐钛矿的比例要低一些，但等离子喷涂技术的TiO_2涂层也表现出气态NH_3的光催化分解。

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