INVESTIGATION OF HIGH TEMPERATURE RESISTANT MATERIALS
GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION
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X-ray diffraction analysis showed the absence of cristobalite in ethyl-silicate-40-impregnated samples. The effect of multiple impregnation on the strength of fused silica test bars impregnated with 10, 30, 50 solutions of AlCl3.6H2O was studied. Samples impregnated with the 10 solution cracked in cooling after the second refiring cycle the strength of slipcast fused silica was reduced from 3750 to 730 psi after the first impregnating and refiring cycle. A decrease in strength and an increase in cristobalite content were also exhibited by samples impregnated with 30 and 50 AlCl3.6H2O. A revised vacuum-pressure technique of impregnating slip-cast fused silica was studied. The study of flame glazing was continued. An IR quartz tube furnace was constructed to control annealing temperatures of glazed samples the fused silica samples were successfully glazed by annealing but cracked upon cooling.