ALPHA-ALUMINA PARTICLES FOR FRICTION MATERIAL AND MANUFACTURING METHOD OF ALPHA-ALUMINA PARTICLES

摘要

PROBLEM TO BE SOLVED: To provide a novel friction adjustment material that is a friction adjustment material used for a friction material and can impart excellent wear resistance to a friction material by alleviating aggression against an opposite material, and a manufacturing method thereof.SOLUTION: Alpha-alumina particles for friction material having grains and an average grain size of the grains of 150 to 1000 nm. It is preferable that an average particle size be 5 to 400 μm and a particle shape be at least one of a spherical shape and an amorphous shape.SELECTED DRAWING: None