Method for producing zirconium nitride powder

Abstract

The invention discloses a method for producing zirconium nitride powder, which comprises the following steps of: crushing sponge zirconium into granules with the granularity of less than 3mm, putting the crushed sponge zirconium granules into a vacuum furnace, supplying power for raising the temperature when the vacuum degree is 5 to 40Pa, keeping the temperature at the pre-nitrogenization temperature, stopping vacuumizing, and introducing nitrogen into the furnace for a pre-nitrogenization reaction; after the pre-nitrogenization, cutting off the power for reducing the temperature to 80 DEG C, and discharging; crushing the pre-nitrogenized materials into powder with the granularity of less than 0.075mm, putting the powder into the vacuum furnace, supplying power for raising the temperature to between 500 and 700 DEG C within 2 to 5 hours when the vacuum degree is 5 to 40Pa; stopping vacuumizing, introducing nitrogen into the furnace continuously raising the temperature to the nitrogenization temperature within 3 to 6 hours, and continuously introducing the nitrogen for nitrogenization; after the nitrogenization, cutting off the power for reducing the temperature, continuously introducing the nitrogen in the process of reducing the temperature, and discharging a zirconium nitride clinker when the temperature is reduced to 80 DEG C; and crushing the zirconium nitride clinker so as to prepare the zirconium nitride powder.

Description

technical field

[0001] The invention belongs to the field of powder metallurgy production, in particular to a production method of zirconium nitride powder. Background technique

[0002] Zirconium nitride ZrN is a kind of refractory compound with golden yellow color, high decomposition temperature, good chemical stability, good high temperature resistance, corrosion resistance and wear resistance. Surface protection material. At present, there are roughly three methods for synthesizing ZrN: first, direct nitriding of metal zirconium powder Zr; second, zirconia ZrO 2 Carbothermal reduction nitriding method; third, zirconium chloride ZrCl 4 vapor deposition method. The direct nitriding method of metal zirconium powder is to heat zirconium powder with a particle size of less than 0.045mm to 1200°C in nitrogen to form ZrN. This method has simple process, low energy consumption and high purity of product ZrN, which can reach 99-99.9%. The disadvantage is that the reaction can...