INVESTIGATION OF HIGH TEMPERATURE RESISTANT MATERIALS. Summary Report No. 1 for March 15, 1955 to October 31, 1957
Tables of melting points and densities are given for refractory metals, hard metals, and oxides. Coating of Mosheet substrates with Al, Au, Ni, Pt, Rh, and Si as single films by evaporation, sputtering, or electroplating is described. Methods of applying and forming thick protective coatings for high temperature service are arc evaporation, hot dipping, flow, cementation vapor decomposition, and thermite fired ceramic coatings. An attempt to apply thick Al coatings to glass, Cu, and Mo using the arc evaporator is described. Hot dipping, flow, cementation, and vapor decomposition were used to form the silicides of Mo on the surfaces of Mo stock. Hard nonporous glazes, hard porous glazes and hard powdered structures hnve been obtained. The adherence between the coatings and a steel substrate was not good, the coating sheared off as a complete unit because of thermal expansion differences. Methods of spraying molten coatings directly onto a substrate were investigated. Aluminum, Mg, and mild and stainless steel sheet were coated with alumina and zirconium silicate by flame spraying. Flame and arc fusion methods were studied as means of fusing and spheroidizing coating materials for fiame-spraying. Cermet coatings consisting of Al/sub 2/O/sub 3/ and Al were applied to mild steel by the Thermo Spray process. Experiments with exothermic, (card 2) NP-6546 (Rpt: UNCLASSIFIED) thermitic type coatings for metals pointed to the possihility that these coating materials might have use as structural materials. Studies of thermitic mixes of oxides of Cr, Co, Fe, Mn, Mo, Ni, Si, Ti, V, and Zr were made. Extensive time was devoted to the development of techniques for producing thermitic cermets free of internal stress cracks, varying porosity, warping, and cracking. Reterminations of the modulus of rupture and elevated temperature tensile strength of the thermitic cermets were studied. Fabrication of rocket nozzles from a castable fused silica body is described. Additives (such as resins, cermets, and graphite) which might increase the strength and thermal conductivity of dry pressed nozzles were studied. (W.L.H.)
- Research Organization:
- Georgia Inst. of Tech., Atlanta. Engineering Experiment Station
- DOE Contract Number:
- NORD-15701
- NSA Number:
- NSA-12-004832
- OSTI ID:
- 4340908
- Report Number(s):
- NP-6546; Project No. A-212
- Resource Relation:
- Other Information: Project No. A-212. Orig. Receipt Date: 31-DEC-58
- Country of Publication:
- United States
- Language:
- English
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