OXIDATION RESISTANCE OF OXIDE-COATED UO$sub 2$ MICROSPHERES
The mechanism and kinetics of oxidation of spherical UO/sub 2/ particles coated with Al/sub2/O/sub3/, BeO, and Mg0, were studied by thermogravimetric techniques. Metallographic and x-ray-diffraction data were obtained to support the conclusions. At temperatures below 1500 un. Concent 85% C, oxidation of Al/ sub 2/O/sub 3/-coated particles occurred by diffusion of oxygen through the coatings, partial oxidation to U/sub 3/O/sub 8/, and subsequent cracking and complete oxidation. Oxidation resistance of Al/sub 2/O/sub3/ particles coated at 1300 and 1400 un. Concent 85% C was superior to that of particles coated at 1000 un. Concent 85% C. Extrapolation of the measured data indicated that the particles coated at 1300 and 1400 un. Concent 85% C shouid have satisfactory oxidation resistance for several thousand hours at temperatures of 1100 un. Concent 85% C and iower. Beryllia-coated particles were also found to have good oxidation resistance at 1100 un. Concent 85% C, but BeO coated particies were more sensitive to thermal stresses than Al/sub 2/O/sub 3/-coated particles. Magnesia-coated particles failed due to thermal stresses at 800 to 900 un. Concent 85% C. (auth)
- Research Organization:
- Battelle Memorial Inst., Columbus, Ohio
- DOE Contract Number:
- W-7405-ENG-92
- NSA Number:
- NSA-17-020401
- OSTI ID:
- 4721478
- Report Number(s):
- BMI-1625
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- United States
- Language:
- English
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