Phase formation of nano-TiO2 particles during flame spraying with liquid feedstock

被引：28
作者：
Yang, GJ [1 ]
Li, CJ [1 ]
Wang, YY [1 ]
机构：
[1] Xian Jiaotong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
来源：
JOURNAL OF THERMAL SPRAY TECHNOLOGY | 2005年 / 14卷 / 04期
基金：
中国国家自然科学基金;
关键词：
flame spraying with liquid feedstock; nanoparticle; phase formation; phase transformation; photocatalytic coating; TiO2;
D O I：
10.1361/105996305X76487
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The nanostructured TiO2 photocatalytic coatings were synthesized through flame spraying with liquid feedstock under different conditions. The nanostructured TiO2 deposit of substantial anatase phase was annealed at different temperatures. X-ray diffraction analysis showed that significant transformation from anatase to rutile occurred at a temperature above 600 degrees C. However, thermal analysis suggested that the phase transformation from anatase to rutile started at a temperature from 400 to 500 degrees C. It was found that the grain size of rutile phase was larger than that of anatase. The deposits annealed at temperatures lower than 450 degrees C were photocatalytically active. However, the deposit annealed at 500 degrees C, which contained 95% anatase crystalline, became photocatalytically inactive. Based on the experimental findings, a model is proposed to explain the phase transformation of the nano-TiO2 particles and the phase formation in flame-spraying of nanostructured TiO2 deposit with liquid feedstock.
引用
收藏
页码：480 / 486
页数：7
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