PROTECTIVE COATINGS FOR MOLYBDENUM ALLOYS. Quarterly Report No. 3 Covering Period October 1-December 31, 1959

Technical Report · Mon Oct 31 00:00:00 EST 1960

OSTI ID:4165616

Three commercial molybdenum coatings prepared by Climax, Linde, and Chromalloy were evaluated by metallographic techniques and x-ray-diffraction analysis. The mode of failure was analyzed and related factors of modulus of elasticity, adherence, hardness, and particularly thermal expansion were discussed. Studies were made on the phase change that occurred in the flame spraying of alumina and mullite. X-ray-diffraction analysis was used to evaluate the alpha to gamma and reversible phase transformation in alumina as well as the devitrification of amorphous mullite which was produced by flame spraying. The use of niobium and tantalum as an intermediate bond layer between molybdenum and ceramic coatings was analyzed on the basis of oxidation and alloy compatibility. A study of the alumina-glass and mullite-glass coating on molybdenum was made. These coatings were evaluated by oxidation tests at 2300 tained F where oxidation occurred in a short period of time. A small micro observation furnace was constructed and used for the studies of wetting, adherence, and inter- reaction between glass, oxide, and refractory metal specimens. (auth) Progress is reported on the following studies: the fabrication, testing, and evaluation of the Experimental Boiling Water Reactor fuel elements; fabrication of ThO/sub 2/- UC/sub 2/ fuel pellets; fabrication of fuel and blanket rods for the Experimentul Breeder Reactor; properties and irradiation of uraniurmplutonium-fissium alloys; corrosion of Al alloys in phosphoric acid; aqueous corrosion of Ta--U-- Zr alloys at 290 tained C; effect of radiation on the corrosion behavior of the Si- -U system; dimensional stability of U-- Zr alloys under irradiation; the effects of radiation on uranium hydride compacts; the recrystallization of cold-rolled U sheet annealed at various temperatures; self-diffusion in U; phase studies and decarburization of C -- U systems; preparation of alpha -uranium single crystals for elastic constants; sintering of ceramic materials; corrosion mechanisms of Zr and Al at elevated temperatures; and radial distribution of neutron density in reactor fuel rods. (W.L.H.)

• Research Organization: General Electric Co. Flight Propulsion Lab. Dept., Cincinnati
• DOE Contract Number: NOAS 59-6026-C
• NSA Number: NSA-14-019307
• OSTI ID: 4165616
• Report Number(s): AD-234944
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-60
• Country of Publication: United States
• Language: English

Related Subjects

METALS, CERAMICS, AND OTHER MATERIALS
ADHERENCE
ALUMINUM OXIDES
ALUMINUM SILICATES
BONDING
CERAMICS
COATING
COMBUSTION
DIFFRACTION
ELASTICITY
EXPANSION
FAILURES
FILMS
FURNACES
GLASS
HARDNESS
INTERACTIONS
MATERIALS TESTING
METALLOGRAPHY
MOLYBDENUM
NIOBIUM
OXIDATION
SPUTTERING
TANTALUM
TEMPERATURE
X RADIATION