In order to establish the foundation of the industrial production of magnesium nitride (Mg3N2), the condition of its preparation was determined by observation of the reaction between magnesium and nitrogen; the size of magnesium, the outflow velocity of nitrogen, the heating temperature and the heating times were experimentally discussed. The results are as follows: (1) Magnesium nitride can be prepared most efficiently by introducing 100 cc of N2 per min on filings or lathe-scraps of amagnesium containa iron boat at 900° for 1 hour. (2) The more the inflow velocity of nitrogen increases, the shorter the time of the reaction between magnesium and nitrogen becomes, and the larger the size of magnesium becomes, the higher the temperature of the reaction rises. (3) The purity of the nitride formed from coarse lathe-scraps of magnesium was higher than in the case of the fine filings. (4) Small amounts of MgO and Mg (OH)2 were contained in the nitride. The nitrided products must be preserved in a closed dry vessel. (5) Magnesium nitride heated in dry air was oxidized at 460∼600°. (6) Magnesium nitride heated in vacuum was found to decompose from about 900°, and its dissociation pressure was almost 1 atm. at about 1170°. (7) Nitride products must be of high purity, prepared at above 800° and of the size of about 50 mesh to be effective in inducing prompt spheroidization of graphite.
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