Abstract
Compositionally different five borosilicate glasses were impregnated into isotropic graphite material, IG11N, to get rid of pores over 2μm. This has allowed the material of 1-2 orders of magnitude in the decrease of carbon oxidation rate. The oxidation resistivity are improved by glass film covering on carbon block. Temperature region with the particularly low rate constant depends on the SiO2 content in the glass. The higher SiO2 content gives rise to the higher temperature region. Mechanical strength at room temperature has been extremely improved from 37MPa to 70-78 MPa for bending strength and from 9.2GPa to 16.7-17.4GPa for elastic modulus. Retention of electrical conductivity has shown that few crack propagation or oxidation suffered from the glass impregnation process.
