1989 Fiscal Year Final Research Report Summary
Photoelectrochemical Properties of TiO_2 Coatings by LPC Plasma Spraying
| Project/Area Number |
63550548
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
溶接工学
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| Research Institution | Osaka University |
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Principal Investigator |
OHMORI Akira Welding Research Institute, Osaka University, Associate Professor, 溶接工学研究所, 助教授 (50029229)
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| Project Period (FY) |
1988 – 1989
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| Keywords | auxiliary gas / photocurrent / LPC plasma-sprayed coatings / plasma spraying / plasma gas / formation free energy / photoelectrochemical / ionized donor density concentration |
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| Research Abstract |
Effects of spray conditions and heat-treatment on the photoelectrochemical behavior of TiO_2-oxide system coatings produced by plasma spraying were investigated.
It is shown that the photocurrent of air plasma-sprayed coatings is larger than one of LPC plasma-sprayed coatings, and auxiliary gas, H_2, influences greatly the photoelectrolysis of TiO_2 and TiO_2-oxide mixture coatings.
The photocurrent of TiO_2 plasma-sprayed coatings increases by adding various metal-oxides, such as Al_2O_3, Y_2O_3 etc, to TiO_2 coatings.
The photoelectrochemical properties of TiO_2 and TiO_2-oxide system plasma-sprayed coatings are improved greatly by heat-treatment (400ﾟC,90min.) in air.
The photocurrent of TiO_2 and TiO_2-oxides coatings that plasma- sprayed with plasma gas, Ar-H_2 and then heat-treated(400ﾟC,90 min.) in air, depend on the formation free energy of the additional oxide. And, photocurrents of such TiO_2-oxide mixture plasma- sprayed coatings increase with the decrease of the ionized donor density concentration, ND of TiO_2-oxide mixture photoanodes.
It is concluded that polycrystalline TiO_2 coatings produced by the plasma-spraying display similar photoelectrochemical characteristics to single-crystal TiO_2 material.
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Research Products
(11 results)
