PRODUCCION DE PLACAS DELGADAS DE UO$sub 2$ INFORME NO. 71. (Production of Thin Plates of UO$sub 2$. Report No. 71)
The effect of some parameters on the fabrication of thin plates of UO/ sub 2/ by the sintering process is studied. Compacting pressures of 0.25 to 2 ton/cm/sub 2/, temperatures from 1100 to 1400 deg C, and sintering times from 1 to 3 hrs were used to determine the optimum values of these parameters. An analysis of the effect of the lubricant during the compression showed that the results were improved by the substitution of polyethylene glycol types for steric types, as the former were more easily removed from the compact and did not attack the UO/sub 2/ during sintering. Fracture during compression and extraction was studied. The compression law for the powder was determined, and the valid ity of the Bal'shin law was proved. The furnace atmospher is of importance to the sintered product. Two types of atmosphere were analyzed ---neutral atmosphere during sintering with final reduction in hydrogen and slightly reducing atmosphere during the entire process. An analysis of the effects on the final density and porosity showed that adding 3% H/sub 2/ to Ar produced good density and a stoichiometric oxide in the final product. It was shown that density is not a sufficient measurement to evaluate the degree of sintering. Only the combined use of density and porosity give a good evaluation. The compression pressure has a great effect on the pore size and distribution in the sintered product. Best results are obtained with high pressures, which gives small uniformly distributed pores. A metallographic study was made to determine the relation between pore size and distribution and the process parameters. Compact zones'' were observed with mean diameter from 1 to 2 mm with very reduced porosity. These zones had better hardness and resistance to corrosion and chemical attack than the rest of the material. (tr-auth)
- Research Organization:
- Argentina. Comision Nacional de Energia Atomica, Buenos Aires
- NSA Number:
- NSA-17-011167
- OSTI ID:
- 4717820
- Report Number(s):
- NP-12228
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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ALCOHOLS
ARGON
ATMOSPHERE
CHEMICALS
COMPACTING
CORROSION
DENSITY
DISTRIBUTION
FABRICATION
FAILURES
FURNACES
GLYCOLS
HARDNESS
HIGH TEMPERATURE
HYDROGEN
LUBRICATION
MEASURED VALUES
METALLOGRAPHY
OXIDES
PLATES
POLYETHYLENES
POROSITY
POWDERS
PRESSURE
QUANTITATIVE ANALYSIS
REDUCTION
SINTERED MATERIALS
SINTERING
STABILITY
THICKNESS
URANIUM DIOXIDE