Production manner and valve seal structure null of valve sealant and valve

摘要

PURPOSE:To improve the sliding characteristics of ceramic granules, etc., while making use of such characteristics as heat and corrosion resistance and to provide a clad fine material applicable to a sealing material, etc. CONSTITUTION:A graphite layer 3 is formed on the outside of a core material 2 made of ceramics, a metal, plastics, solid carbon, etc., to obtain a clad granular body CB having a double structure consisting of the core material 2 as the central part and the graphite layer 3 as the outer layer. The core material 2 acts like aggregate and enhances compressive strength as a whole. The outer graphite layer 3 reduces frictional resistance and improves sliding characteristics in the case of use as a sealing material, etc.