Abstract
The mechanism of reaction sintering was studied in mixtures of uranium‐uranium sesquinitride and uranium‐silicon. Refractory uranium mono‐nitride of high density may be prepared by hot pressing mixtures of uranium and uranium sesquinitride at 1000°C. Steps of the process are (1) densification of the uranium metal into a continuous uranium matrix and (2) reaction of the uranium sesquinitride with the uranium matrix. On the contrary, during hot pressing uranium‐silicon mixtures react before any densification of the uranium occurs. The pressing temperature required for a given density is then practically the same as for unreacted powders and the previously formed compound. Densification stages of the prereacted compounds may be described by the equations y = aot2/5+ b0, y = a1 log t + b1, and y = a2t−1/2+ b2, where y is the shrinkage and t is the time. The first stage is absent during densification of the powder mixtures.
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