Conclusions
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1.
An investigation has shown that during the heating of ZrN-Al2O3 powder mixtures in nitrogen, specimens sinter as nonreactive substances at temperatures below 1600°C and as reactive substances at higher temperatures.
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2.
During sintering the zirconium nitride partly oxidizes to ZrO2 by oxygen being liberated as a result of the decomposition of the alumina.
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3.
Above a temperature of 1800°C the Al2O3 and ZrO2 form a eutectic, and sintering then takes place in the presence of a liquid phase.
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4.
Sintering in nitrogen is accompanied by the formation of aluminum nitride, which settles in the form of needles on the cold shields of the furnace. During sintering in argon no aluminum nitride formation is observed, and the zirconium nitride does not oxidize.
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E. I. Smagina, V. S. Kutsev, and B. F. Ormont, “An investigation of the equilibrium in the Zr-N system at high temperatures,” Zh. Fiz. Khim.,39, 2328–2335 (1960).
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Translated from Poroshkovaya Metallurgiya, No. 10(178), pp. 11–14, October, 1977.