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- W1987995325 abstract "The phase transformation of anatase to rutile and the growth of nano primary particle in agglomerated TiO2 powder in heat treatment and HOVF spraying processes were investigated systematically. The 200nm, 30nm and 7nm primary particles were agglomerated by spray dry method for the feedstock powders of P200, P20 and P7, respectively. From the heat treatment results of feedstock powders, it was found that the phase transformation temperature of P7 was 100K and 150K lower than that of P30 and P200, respectively. The growth of primary particles of P7 and P30 happened earlier than their phase transformation, and increased drastically with increasing the heat treat temperature. Under various fuel pressure HVOF conditions, the anatase phase content was between 86% and 5% for sprayed P7 coating, whereas it was higher than 50% for P30 coating. The particle sizes of P7 and P30 grew during spraying processes.The anatase content of collected particles was lower than that of HVOF sprayed coatings in all conditions if phase transformation happened. Although the particle size had not significant change for P200, it grew obviously for P7 and P30. It was considered that the phase transformation and growth of primary particles were frozen for the rapid cooling effect due to the low temperature substrate. Therefore, it was concluded that the coating with high anatase ratio (approximately 100%) and primary particle size of single nano might be developed using the substrate with high thermal conductivity and large heat capacity." @default.
- W1987995325 created "2016-06-24" @default.
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- W1987995325 date "2004-01-01" @default.
- W1987995325 modified "2023-09-25" @default.
- W1987995325 title "Control of Phase Transformation and Growth of Primary Particle in Photocatalytic Coating Sprayed Using Agglomerated Anatase TiO2 Nano Particles" @default.
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- W1987995325 doi "https://doi.org/10.7791/jhts.30.322" @default.
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