THE EFFECT OF FUEL TO OXYGEN RATIOS ON THE PROPERTIES OF HIGH VELOCITY OXY-FUEL TiO2 NANO-PHOTOCATALYST COATINGS

被引：1
作者：
Bozorgtabar, Maryamossadat [1 ]
Salehi, Mehdi [2 ]
Rahimipour, Mohammadreza [1 ]
Jafarpour, Mohammadreza [3 ]
机构：
[1] Mat & Energy Res Ctr, Tehran, Iran
[2] Isfahan Univ Technol, Dept Mat Eng, Esfahan 84154, Iran
[3] Mobarakeh Steel Co, Esfahan, Iran
来源：
MODERN PHYSICS LETTERS B | 2010年 / 24卷 / 02期
关键词：
HVOF; TiO2; phase transformation; nanostructure coating; photocatalyst; PHASE-TRANSFORMATION; NANOSTRUCTURED TIO2; MICROSTRUCTURE; PERFORMANCE; IMMOBILIZATION; DECOMPOSITION; IRRADIATION; BEHAVIOR; PHENOL;
D O I：
10.1142/S0217984910022263
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
A liquid fuel high velocity oxy-fuel (HVOF) thermal spray process has been used to deposit TiO2 photocatalytic coatings utilizing a commercially available anatase/rutile nano-powder as the feedstock. The coatings were characterized in terms of the phases present, its crystallite size and coating morphology by means of X-ray diffraction analysis, scanning electron microscopy and transmission electron microscopy, respectively. The results indicate that the sprayed TiO2 coatings were composed of both TiO2 phases, namely anatase and rutile with different phase content and crystallite size. A high anatase content of 80% by volume was achieved at 0.00015 fuel to oxygen ratio with nanostructure coating by grain size smaller than feed stock powder. It is found that fuel to oxygen ratio strongly influenced on temperature and velocity of particles in stream jet consequently on phase transformation of anatase to rutile and their crystallite size and by optimizing the ratio which can promote structural transformation and grain coarsening in coating.
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页码：247 / 255
页数：9
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