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Method for preparing spherical titanium nitride powder through reaction atomization method

A technology of titanium nitride powder and atomization method, applied in the field of powder metallurgy, can solve the problems of difficulty in powder feeding and dispersion, increased oxygen content of raw materials, and high oxygen content of titanium nitride powder, so as to avoid the limitation of raw material purity and particle size, improve the Production efficiency, the effect of improving nitrogen content

Pending Publication Date: 2021-03-12
江苏金物新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw material used in this method is non-spherical titanium powder. When the particle size of the non-spherical titanium powder is less than 300 mesh, on the one hand, the specific surface area of ​​the powder increases, so that the oxygen content of the raw material increases, and then the oxygen content in the titanium nitride powder obtained by spheroidization is relatively high. ; On the other hand, the fluidity of the powder is very poor, and it is difficult to feed and disperse the powder, which makes it difficult for continuous preparation and production

Method used

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  • Method for preparing spherical titanium nitride powder through reaction atomization method
  • Method for preparing spherical titanium nitride powder through reaction atomization method
  • Method for preparing spherical titanium nitride powder through reaction atomization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] a) Put the titanium wire into a 1:5 solution of hydrogen fluoride and nitric acid, ultrasonically clean it at 50°C for 20 minutes, dry it and set it aside;

[0034] b) Vacuumize the atomization reaction chamber to 10 -1 Pa, refill N 2 The active gas establishes a protective atmosphere and adjusts the pressure of the atomization reaction chamber to +50Kpa;

[0035] c) Preheat the titanium wire to 500°C by high-frequency induction heating equipment; 2 The plasma melts the preheated titanium filament into a continuous stream or droplets, and at the same time, the highly reactive N 2 The plasma reacts rapidly with the stream or droplets to form titanium nitride droplets;

[0036]The above radio frequency plasma modulation and stabilization: using radio frequency plasma power of 50KW, the plasma is stabilized in two steps, the first step is to use argon as the main gas to ignite the plasma, the flow rate is 30L / min, argon is used as the edge gas to cool and compress the p...

Embodiment 2

[0040] a) Put the titanium wire into a 1:5 solution of hydrogen fluoride and nitric acid, ultrasonically clean it at 30°C for 30 minutes, dry it and set it aside;

[0041] b) Vacuumize the atomization reaction chamber to 10 -2 Pa, refill N 2 The active gas establishes a protective atmosphere and adjusts the pressure of the atomization reaction chamber to 10Kpa;

[0042] c) Preheat the titanium wire to 1000°C by high-frequency induction heating equipment; 2 The plasma melts the preheated titanium filament into a continuous stream or droplets, and at the same time, the highly reactive N 2 The plasma reacts rapidly with the stream or droplets to form titanium nitride droplets;

[0043] The above radio frequency plasma modulation and stabilization: using radio frequency plasma power 60KW, the plasma is stabilized in two steps, the first step is to use argon as the main gas to ignite the plasma, the flow rate is 35L / min, argon is used as the edge gas to cool and compress the pla...

Embodiment 3

[0047] a) Put the titanium wire into a 1:5 solution of hydrogen fluoride and nitric acid, ultrasonically clean it at 60°C for 10 minutes, and dry it for later use;

[0048] b) Vacuumize the atomization reaction chamber to 10 -3 Pa, refill N 2 The active gas establishes a protective atmosphere and adjusts the pressure of the atomization reaction chamber to -10Kpa;

[0049] c) Preheat the titanium wire to 800°C by high-frequency induction heating equipment; 2 The plasma melts the preheated titanium filament into a continuous stream or droplets, and at the same time, the highly reactive N 2 The plasma reacts rapidly with the stream or droplets to form titanium nitride droplets;

[0050] The above radio frequency plasma modulation and stabilization: use radio frequency plasma power of 40KW, the plasma is stabilized in two steps, the first step is to use argon as the main gas to ignite the plasma, the flow rate is 25L / min, argon is used as the side gas to cool and compress the p...

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Abstract

The invention discloses a method for preparing spherical titanium nitride powder by a reaction atomization method. The method comprises the following steps of: pickling the surface of a titanium wireto remove an oxide layer; before powder preparation, vacuumizing an atomization reaction chamber, and introducing N2 active gas into the atomization reaction chamber; preheating the titanium wire through high-frequency induction heating equipment; melting the preheated titanium wire into continuous liquid flow or liquid drops through high-temperature N2 plasma generated by a radio frequency plasmalamp torch, and meanwhile, enabling the N2 plasma to react with the liquid flow or liquid drops to form titanium nitride liquid drops; and crushing and atomizing the titanium nitride liquid drops into fine liquid drops through an atomizing nozzle, condensing the titanium nitride liquid drops into balls under the action of liquid surface tension, conducting solidifying in the cooling process to keep the shape, finally conducting deep nitridation in an atmosphere furnace, and thus obtaining the spherical titanium nitride powder. According to the method, high-frequency induction heating and radio-frequency plasma combined gas atomization powder making technology is utilized, so that the stable N2 plasma is established; high-temperature chemical reaction of titanium and N2 is achieved throughthe integration process of plasma melting and reaction spheroidization; and the high-quality titanium nitride ceramic spherical powder is prepared.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a method for preparing spherical titanium nitride powder by a reaction atomization method. Background technique [0002] Titanium nitride (TiN) is a new type of multifunctional cermet material. It has high melting point, high hardness, acid and alkali resistance, corrosion resistance and low friction coefficient. It is a good conductor of heat and electricity. Commonly used as a coating on titanium alloys, steel, cemented carbide and aluminum structures to improve surface properties. As a thin coating, titanium nitride is used for hardening, protecting cutting and sliding surfaces, as well as for decorative purposes and as a non-toxic external medical implant. [0003] Traditional titanium nitride powder preparation methods, such as metal titanium powder nitriding method, titanium dioxide carbothermal reduction nitriding method, gas phase method, etc., prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/16B22F1/00C01B21/076C22C29/16
CPCB22F9/16C22C29/16C01B21/0761B22F1/065B22F1/145Y02P20/10
Inventor 龙海明王海英郭志猛郝俊杰杨芳
Owner 江苏金物新材料有限公司
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