抄録
It was found by X-ray analysis that the crystals of flame-sprayed Al2O3 films were mainly composed of γ-form and partly of α-form.
The results obtained, by the two methods, powder process and rod process, agreed with each other.
The crystal structure was converted from γ-form into α-form by keeping the films for 2hr. at 1250°C.
The above conversion was more feasible in the sprayed films by rod process than in those by powder process.
