Accession Number : AD0646616

Title :   HIGH VISCOSITY THERMAL PROTECTION MATERIALS.

Descriptive Note : Summary rept., 30 Jun 65-30 Jun 66,

Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD

Personal Author(s) : Wilson,Roger E. ; Caum,D. M.

Report Date : 16 DEC 1966

Pagination or Media Count : 35

Abstract : Processes were developed for hot pressing a 68.5% tungsten-31.5% silica composition to over 97% of the calculated theoretical density. Hot pressing characteristics changed when crystalline silica was substituted for vitreous silica. Grinding and hot pressing methods were studied for fabricating test nozzles for the NOL oxyhydrogen rocket motor. Gases entrapped during hot pressing are expected to be a factor in ablation performance. Vacuum-argon sintering of the silica-tungsten mixture was studied and photomicrographs revealed a structure similar to that of the Bjorksten Laboratory specimens but different from that of hot pressed material. (Author)

Descriptors :   (*REFRACTORY MATERIALS, PROCESSING), (*TUNGSTEN, REFRACTORY MATERIALS), (*SILICON DIOXIDE, REFRACTORY MATERIALS), (*NOZZLE INSERTS, REFRACTORY MATERIALS), MATERIAL FORMING, HOT PRESSING, GRINDING, DENSITY, SINTERING, MICROSTRUCTURE, PARTICLE SIZE, ABLATION, ROCKET NOZZLES

Subject Categories : Ceramics, Refractories and Glass
      Fabrication Metallurgy
      Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE