TiO2 coatings were fabricated using suspension plasma spraying(SPS)technology at varying substrate temperatures.This study investigates the impact of substrate temperature on both the photocatalytic and mechanical properties of TiO2 coatings,aiming to identify the optimal substrate temperature for TiO2 photocatalytic coatings.The microstructure,phase composition and optical properties of TiO2 coatings were thoroughly analyzed through techniques such as field emission scanning electron microscopy,X-ray diffractometry,synchronous thermal analysis and UV-VIS spectrometry.Additionally,the structural morphology and optical characteristics of the deposited coatings were examined.Photocatalytic experiments,bonding strength tests and scratch tests were conducted to comprehensively explore the influence of substrate temperature on the photocatalytic and mechanical properties of the coating.As the substrate temperature decreases from 250℃ to 110℃,the anatase content in the coating gradually increases by 15%,resulting in a reduction of the indirect band gap by 0.5 eV.This change enhances the absorption intensity of visible light,leading to an 11% increase in the methylene blue removal rate under visible light.However,the reduction in substrate temperature is accompanied by a decrease in mechanical properties,including a 12.28 MPa reduction in the binding strength,and a 1.77 N reduction in the normal critical load of scratch test.These findings provide essential insights for determining the optimum substrate temperature for TiO2 photocatalytic coatings.
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