Accession Number : AD0256259

Title :   INVESTIGATION OF HIGH TEMPERATURE RESISTANT MATERIALS

Corporate Author : GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION

Personal Author(s) : POULOS,N.E. ; ELKINS,S.R. ; WALTON,J.D.

Report Date : 30 APR 1961

Pagination or Media Count : 1

Abstract : 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.

Descriptors :   *CERAMIC COATINGS, *CERAMIC MATERIALS, *REFRACTORY MATERIALS, ALUMINUM COMPOUNDS, CASTING, CERMETS, CHLORIDES, ETHYL RADICALS, FLAME SPRAYING, HEATING, IMPREGNATION, MANUFACTURING, OXIDES, PROCESSING, RADOMES, SILICATES, SILICON COMPOUNDS, VACUUM APPARATUS

Distribution Statement : APPROVED FOR PUBLIC RELEASE