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- W229236469 abstract "The physico-chemical properties of mixed carbides of uranium and zirconium were measured to 2400 deg K. Vaporloss measurements are being conducted to determine the influence of the U: Zr ratio. Thermal aging of 90 mol% face uranium concentration to about 35 mol% UC, and thereby lowered its vaporization loss. Specimens of 10 to 20 mol% UC maintained a constant concentration of uraium on their surfaces during thermal aging at 2300 deg K, but did show a decrease in weight loss with increasing exposure times. The specimens of low UC content showed rates of weight loss at 2300 deg K at least an order of magnitude lower than the rate exhibited by the high-UC specimen. Analyses of collected condensate have been performed. Electrical-resistivity measurements have been conducted for mixed-carbide specimens from room temperature to 2400 deg K. The resistivity data obtained are represented as a linear function of temperature. The interdiffusion between UC and tantalum or niobium is being investigated using a technique which incorporates the bonding of the diffusion couple as an integral part of the diffusion anneal. A UC-Nb diffusion couple annealed at 1875 plus or minus 20 deg C for 5 min and a UC - Ta diffusionmore » couple annealed at 1925 plus or minus 30 deg C for 90 min both showed evidence of entry into a three-phase region composed of UC + liquid + (U,Nb) or (U,Ta) solid solution. Evidence of the Kirkendall effect has been found, and voids were observed which may be associated either with this effect or with a volume change duning solidification of the liquid phase. (auth)« less" @default.
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- W229236469 date "1961-10-31" @default.
- W229236469 modified "2023-09-27" @default.
- W229236469 title "INVESTIGATIONS OF CARBIDES AS CATHODES FOR THERMIONIC SPACE REACTORS. Quarterly Progress Report, Period Ending August 31, 1961" @default.
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