Abstract
A2024 alloy is a popular alloy for astronautics applications, such as a body of a spacecraft. Contamination problem on A2024 alloy is serious for long-term activity in space. Photo catalyst is a useful tool to dissolve contaminants on ground. Titanium oxide of TiO2 with anatase phase is popular photo catalyst. Here, TiO2 films were synthesized on A2024 alloy by sol-gel method. Annealing process was necessary to crystallize TiO2 gel with anatase phase. Crystallization conditions to form anatase phase were 400 ℃ and 20 hours. An aging treatment was carried out after a solid solution heat treatment and a water quenching as well as a conventional heat treatment of Al alloys since the Vickers hardness was decreased by an annealing. TiO2 films were strong enough after the aging heat treatment. Even after the aging heat treatment, TiO2 films can dissolve the polystyrene under an air condition. Thus photo catalyst will be useful tool for A2024 alloy to dissolve contaminants in space.
