CERAMIC BALL MEMBER, FRAC-BALL, HYDRAULIC FRACTURING SYSTEM AND METHOD OF MANUFACTURING CERAMIC BALL MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a ceramic ball which has high pressure resistance but can be relatively easily broken by an impact force such as a striking force.SOLUTION: The ceramic ball member has an outer peripheral surface which is almost spherical and an inner peripheral surface, is mainly composed of ceramic containing at least carbon, and has a larger carbon content ratio in its inside area including the inner peripheral surface than in its outer area including the outer peripheral surface.