A method of converting a flammable or flame-retardant base material or part into nonflammable by covering the base material or part with a collection of two types of fine particles consisting of aluminum oxide fine particles and maghemite fine particles.

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a coating film having heat resistance at 840 ° C. and airtightness even at 840 ° C., and a method for covering a flammable or flame-retardant base material or component with the coating film. Secondly, the present invention provides a method of covering a base material or a part with the coating film regardless of the surface condition, material, shape and size of a flammable or flame-retardant base material or a part. SOLUTION: A base material or a component 2 is coated with a collection 1 of fine particles in which two types of fine particles, aluminum oxide fine particles and mughemite fine particles, are stacked without gaps and laminated to saturate the magnetization of the mughemite fine particles. The fine particles are bonded to each other by the magnetic attraction force acting on the maghemite fine particles, and compressive stress is uniformly applied to the collection of the two types of fine particles, and frictional heat is generated at the part where the fine particles come into contact with each other. The fine particles are bonded to each other, and the collection of the fine particles bonded by the magnetic attraction force and the frictional heat bites into the surface of the base material or the component and crimps to the base material or the component. [Selection diagram] Fig. 1