STUDY ON THE PREPARTION OF URANIUM CARBIDES (in Japanese)
By heating a mixture of UO/sub 2/ and graphite in vacuum at 1600 to 2000 deg C, UC or UC/sub 2/ without unreacted UO/sub 2/ was obthined. Each of these carbides was milled in hexane, compacted into shapes in argon atmosphere, and then sintered in vacuum (10/sup -4/ mm Hg) at 1800 to 2000 deg C. High purity and high density (95% th.D.) pellets were thus obtained. The sintered pellets were examined by carbon analysis, metallographic observation, and x-ray diffraction. It was found that UC sintered pellet had a monopbase structure with a grain size of 50 approximates 100 mu and the stoichiometric composition. UC/sub 2/ sirtered pellet was composed of UC/sub 2/ phase with grain size of 50 100 mu and UC phase of about 10%. Sinterability of UC/sub 2/ markedly decreased with increasing carbon content in the range of 8.6 to S.9%. This change was attributed to the presence of free carbon. Maximum carbon content of UC/sub 2/ pbase at the temperature range of 1800 to 2500 deg C was determined as 8.6 plus or minus 0.1 wt%, that is, the composition of this phase could be expressed as UC/sub 1.86 plus or minus 0.02/. The kinetics of transformation of cubic UC/sub 2/ to tetragonal was regarded as a martensitic diffusionless one. (auth)
- Research Organization:
- Mitsubishi Atomic Power Industry, Inc. Omiya, Japan
- NSA Number:
- NSA-18-020493
- OSTI ID:
- 4009873
- Journal Information:
- Nippon Genshiryoku Gakkaishi (Japan), Journal Name: Nippon Genshiryoku Gakkaishi (Japan) Vol. Vol: 6; ISSN NGEGA
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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Related Subjects
CARBON
COMPACTING
CONFIGURATION
DENSITY
DIFFRACTION
DIFFUSION
GRAIN SIZE
GRAPHITE
HEATING
HEXANE
HIGH TEMPERATURE
IMPURITIES
MARTENSITE
METALLOGRAPHY
METALS, CERAMICS, AND OTHER MATERIALS
MILLING
MIXING
PELLETS
PHASE DIAGRAMS
PREPARATION
QUALITATIVE ANALYSIS
QUANTITY RATIO
REACTION KINETICS
SINTERING
URANIUM CARBIDES
URANIUM DIOXIDE
VACUUM
X RADIATION