Patent ID: 7381673
Filing Date: 2008-06-03
Classification: B32B,C04B,C23C,H01L,Y10T

Abstract:
1. A composite material being composed of SiC, SiO 2 , at least one selected from the group consisting of Al and Si, wherein the composite material is made by impregnating a fusion solidified body, which is composed of SiC and at least one selected from the group consisting of Al and Si, wherein alkyl silicate is used to fill pores of the body, and then the body is dried to retain SiO wherein the He leak rate is measured by a method comprising: attaching the surface of the composite material with a metal pipe integrated with an O-ring having an internal diameter of 30 mm, followed by vacuuming the inside room of the pipe, followed by putting the metal pipe and the composite material in a vinyl bag or a desired shape of casing, followed by filling it with a He gas to introduce the He gas into the inside room of the metal pipe thorough all of leaking locations, and followed by continuously supplying the He gas to confirm a drop of vacuum.