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- W2209928397 abstract "Thermogravimetric studies were made to determine the kinetics of the reaction between 99.83% vanadium sheet and purified nitrogen gas in the temperature range of 1173 to 1723 deg K, at pressures of 9.3 x 10/sup 4/ to 9.3 Pa (700 to 7x 10/sup -2/ torr) andtimes up to 160 h. Metallographic and x-ray- diffraction techniques were used to examine the reaction products. The data followed either parabolic, cubic, or linear kinetics. In general, it was observed that the initial kinetics were parabolic. At high temperatures and near atmospheric pressures, the reaction kinetics changed from parabolic to cubic at longer times. At the lowest pressure the preparabolic kinetics were linear. Weight gains in the parabolic region were mainly due to solution and diffusion of nitrogen in vanadium with the weight gain shown by the equation ( DELTA W/A)/sup 2/ = 3.2 x 10/sup -4/ Te/sup -162,000/RT/t. The cubic region was related to the formation of an outer layer of VN over an intermediate layer of V/sub 3/N and a core of the saturated solution of nitrogen in vanadium with the approximate weight gain shown by the equation ( DELTA W/A)/sup 3/ = 1.24 x 10/sup -3/ Te/sup - 208,000/RT/t. Linear weightmore » gains at low pressure were presumed to be controlled by the rate of nitrogen absorption. (auth)« less" @default.
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- W2209928397 date "1974-01-01" @default.
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- W2209928397 title "Kinetics of solid V--N$sub 2$ reactions at high temperatures" @default.
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