Method for manufacturing high-density vanadium-nitrogen alloy

Abstract

The invention provides a method for producing vanadium-nitrogen alloy. In the method, powdered vanadium oxide or ammonium metavanadate, carbon powder, bonding agents and density increasing agents are evenly mixed and are subjected to briquetting and forming; the mixture is continuously added in an external-heat type rotary kiln under the atmosphere of nitrogen gas and preheated up to the temperature of below 1,000 DEG C under the protection of the nitrogen gas, and at a discharge port, preheated massive products which are cooled down to the room temperature under the protection of nitrogen gas are collected; and the massive products are put in an improved soft magnetism nitrogen atmosphere kiln and heated up to the temperature of between 1,000 and 1,500 DEG C so as to make materials carry out the carbonization reaction and the nitriding reaction, and the vanadium-nitrogen alloy products are obtained after discharge. In the vanadium-nitrogen alloy obtained, the V content is between 78 and 83 percent, the N content is between16 and 21 percent, the C content is less than or equal to 6 percent max, the contents of silicon, phosphor and aluminum are less than 0.01 percent, and the apparent density is more than 4.4g / cm<3>. The apparent density can be adjusted according to the requirements of a customer, and the maximum apparent density is 5.0 g / cm<3>. The method is characterized in that under the condition of not changing prior production processes, the apparent density of the vanadium-nitrogen alloy is improved by adding the density increasing agents, and the adsorption rate of molten steel in the vanadium-nitrogen alloy is more than 98 percent.

Description

technical field

[0001] The invention relates to a method for high-density production of vanadium-nitrogen alloy, which belongs to the field of new materials. Background technique

[0002] In 1925, using pine charcoal, Friederich and Sittig (E.Friederich and L.Sittig, Z.Anorg.Allg.Chem., 1925, 144, 169) used V 2 o 3 As a raw material, vanadium nitride was prepared at 1200 °C.

[0003] In 1975, vanadium pentoxide was reduced with ammonia, and Guidotti et al. (R.A.Guidotti, G.B.Atkinsonand D.G.Kesterke, Report of Investigation No.8079, US Bureau of Mines, Washington DC, 1975) also obtained vanadium nitride.

[0004] In 1995, using methane at 1180°C, Rajat and S.T.Oyama (Journal of Solid State Chemistry, 1995, 120, 320-326) reduced vanadium pentoxide to synthesize vanadium carbide.

[0005] In 2000, vanadium nitride was prepared by using vanadium pentoxide at a high temperature of 1200-1800° in an intermediate frequency induction furnace by carbon reduction method, Prabhat Ku...