Refractory metal nano nitride and preparation method thereof

A technology of refractory metal and nitride, which is applied in the field of refractory metal nano-nitride and its preparation, and can solve the problems of complex preparation process of refractory metal nano-nitride and great impact on the environment

Inactive Publication Date: 2020-12-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of this application is to provide a refractory metal nano-nitride and its preparation metho...

Method used

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  • Refractory metal nano nitride and preparation method thereof
  • Refractory metal nano nitride and preparation method thereof
  • Refractory metal nano nitride and preparation method thereof

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[0039] Based on the technical problems of complex preparation process of existing refractory metal nano-nitrides and relatively large environmental pollution, the present invention provides a preparation method of refractory metal nano-nitrides, such as figure 1 shown, which includes the steps:

[0040] S10. Provide a block of refractory metal and a tungsten rod, pretreat the block of refractory metal, remove the metal oxide layer on the surface, and place the block of refractory metal and the tungsten rod in an electric arc furnace Inside;

[0041] S20. Vacuum the electric arc furnace, and then fill the buffer gas and start the arc, so as to prepare the refractory metal nano-nitride.

[0042] In this embodiment, a direct current arc method is used to prepare refractory metal nano-nitrides, wherein a tungsten rod placed in an electric arc furnace is used as a cathode, and a block refractory metal is used as an anode, and the tungsten rod and the block refractory The molten m...

Embodiment 1

[0054] Pretreatment to remove surface oxides and impurities: use tungsten rods as cathodes, use bulk titanium with a metal purity ≥ 99.95% as anodes, place tungsten rods and block titanium in an electric arc furnace, and the diameter of the tungsten rods is 10mm , the distance between the two electrodes in the electric arc furnace is 4mm, vacuumize, fill with 20kPa of hydrogen, set the current to 80A, start the arc, and at the same time, turn on the vacuum pump and process for 4min.

[0055] Preparation of nano-titanium nitride by DC arc method: after the arc furnace is cooled, the arc furnace is evacuated to a vacuum of 3Pa, filled with nitrogen gas of 60kPa, the DC arc discharge current is set to 150A, and the discharge time is set to 30min, start After the electric arc and the reaction are completed, the deposits on the inner wall of the reaction chamber are collected to obtain titanium nitride nanoparticles.

Embodiment 2

[0057] Pretreatment to remove surface oxides and impurities: use tungsten rods as cathodes, use block-shaped zirconium with a metal purity of ≥99.95% as anodes, and place tungsten rods and block zirconium in an electric arc furnace, wherein the diameter of the tungsten rods is 20mm , the distance between the two electrodes in the electric arc furnace is 6mm, vacuumize, fill with 30kPa hydrogen, set the current to 70A, start the arc, and at the same time, turn on the vacuum pump and process for 5min.

[0058] Prepare nano-zirconium nitride by direct current arc method: After the electric arc furnace is cooled, the electric arc furnace is evacuated to a vacuum of 3Pa, and the mixed gas of nitrogen and hydrogen is filled at 60kPa, and the volume ratio of nitrogen and hydrogen is 1:1. The arc discharge current was set to 200A, the discharge time was set to 10min, and the arc was started. After the reaction was completed, the sediment on the inner wall of the reaction chamber was co...

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Abstract

The invention relates to a refractory metal nano nitride and a preparation method thereof. The preparation method comprises the steps that blocky refractory metal and a tungsten rod are provided, theblocky refractory metal is pretreated, a metal oxide layer on the surface is removed, and the blocky refractory metal and the tungsten rod are placed in an electric arc furnace; and the electric arc furnace is vacuumized, then buffer gas is injected, the electric arc is started, and the refractory metal nano nitride is prepared. The refractory metal nano nitride is prepared by adopting a direct-current arc plasma method which has the advantages of simplicity in operation, environmental friendliness, controllable reaction atmosphere and the like, the preparation process is simple, and the environment is not influenced.

Description

technical field [0001] The invention relates to the field of refractory metal preparation, in particular to a refractory metal nano-nitride and a preparation method thereof. Background technique [0002] Refractory metal nitride is a kind of intermetallic compound, which has the properties of transition metal, covalent compound and ionic crystal. This kind of compound has high melting point, high hardness, high thermal conductivity, good electrical conductivity and chemical stability. It is widely used in the fields of cutting tools, wear-resistant parts, coating materials, electrical performance structural materials, electromagnetic components and superconducting materials due to its excellent properties such as corrosion resistance and corrosion resistance. For example, titanium nitride has become a new type of multifunctional cermet material because of its high melting point, high hardness, low friction coefficient, and good conductor of heat and electricity; Kieffer et a...

Claims

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Application Information

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IPC IPC(8): C01B21/076B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B21/0761C01P2002/72C01P2004/04C01P2004/64
Inventor 梁风张达戴永年
Owner KUNMING UNIV OF SCI & TECH
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