Water-reactive Al-based composite material, water-reactive Al-based thermally sprayed film, process for production of such Al-based thermally sprayed film, and constituent member for film-forming chamber

A method for producing a water-reactive Al-based thermally sprayed film, comprising

• melting a material comprising
• Al;
• 2.0 to 3.5% by mass of In;
• 0.2 to 0.5% by mass of Si;
• and
• 0.13 to 0.25% by mass of Ti,
• wherein all mass ratios are based on the total amount of Al,
• wherein the In, Si and Ti are incorporated into the Al to form a resulting
• molten material having a uniform composition;
• and
• thermally spraying the molten material on the surface of a substrate, while quenching the sprayed molten material to thus solidify the same and to thereby form a film,
• wherein after the water-reactive Al-based thermally sprayed film is subjected to an influence of a thermal hysteresis of an order of 300 to 350° C., the Al film is dissolved by being allowed to react with warm water maintained at a temperature ranging from 40 to 130° C.