Accession Number : AD0262238

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 : 31 JUL 1961

Pagination or Media Count : 1

Abstract : X-ray diffraction studies showed that for slipcast fused silica impregnated with AlCl3 the percentage bulk of cristobalite was reduced from 73.3% to 4.2% after 3 cycles following revised firing and impregnation procedures. Fused silica substrates could not be coated with alumina using conventional arc-spraying techniques. Procedures for arc-plasma flame glazing on fused silica are reported; average transverse strength over unglazed samples was increased 34%. Water absorption determinations indicated that the slipcast fused silica surfaces can be sealed by arcplasma glazing. F-40 Arc Plasma Unit alumina particle melting studies demonstrated that more complete particle melting took place when the high enthalpy-low velocity nozzle was used instead of the conventional No. 3 spray nozzle. Particles sprayed with the latter exploded on contact with water. Other studies included work on thermal shock, radome fabrication, and NOL sample evaluation in oxyhydrogen rocket motor exhaust.

Descriptors :   *CERAMIC COATINGS, *CERAMIC MATERIALS, *FLAME SPRAYING, *REFRACTORY COATINGS, *REFRACTORY MATERIALS, ALUMINUM COMPOUNDS, CERMETS, CHLORIDES, EROSION, IMPREGNATION, MANUFACTURING, OXIDES, PLASTICS, PROCESSING, RADOMES, SILICATES, SILICON COATINGS, SILICON COMPOUNDS, SPRAY NOZZLES, THERMAL INSULATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE