Abstract
High silica glasses were filled in pores of carbon material, AGEN, to improve the oxidation resistivity above 1500°C. An impregnated borosilicate glass were (SiO2 content: 62.5wt%) phaseseparated into SiO2 and the residue which was removed by 1N H2SO4. Thus the porous silica glass in which the SiO2 content was 95.9wt% was densified by sintering at 1350°C under a N2 atmosphere. A part of 49.1% was filled by SiO2 out of the total pore volume of AGEN. One order of magnitude in oxidation rate compared to that of non-treated AGEN was decreased at the specific temperature ranges of 900-1200°C for the borosilicate glass impregnated AGEN and 1450-1600°C for the high silica glass filled AGEN. Electrical conductivity and thermal expansion coefficient were independent of impregnation or the other treatment. Mechanical strength at room temperature was improved by 2.6 and 1.8 times for the borosilicate glass impregnated AGEN and high silica glass filled AGEN, respectively.
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