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Synthesis and application of micro-nano-chromium nitride powder

2018-12-14
In the nitrides of various transition elements, chromium nitride has extremely high hardness and mechanical strength, excellent corrosion resistance and high temperature stability. Therefore, chromium nitride is an accepted alternative to titanium nitride as wear resistance and resistance. Abrasion resistant material for corrosion protection coatings that can be used as a protective coating for hard alloys, drilling tools and mechanical parts. In addition, the special electronic structure and magnetic properties of chromium nitride make it a good dilute magnetic semiconductor material; the excellent electrochemical properties of chromium nitride make it a good application prospect in the field of supercapacitors; chromium nitride in high nitrogen steel In the smelting, the nitrogen-increasing effect produced as a nitrogen-enriching raw material is significantly better than that of manganese nitride. With the continuous exploration of the performance of chromium nitride, chromium nitride will play a more important role in modern industry.
 

The synthesis method of chromium nitride powder is mainly divided into five categories.

Mechanical pulverization methods mainly include mechanical alloying and high energy ball milling. The reaction can be carried out at normal temperature or at a relatively low temperature to prepare a supersaturated solid solution powder. However, it takes a long time for ball milling, energy consumption is large, the surface of the powder is easily contaminated, and fine grain welding is combined to form large particles.
 
There are three kinds of liquid phase methods: precipitation method, sol-gel method and electrochemical method. The temperature required for the reaction is low, the particle size of the powder can reach nanometer level, and the powder form is uniformly controllable. The operating conditions of the preparation process are strictly required, and the powder needs to be cleaned and removed after sintering.
 
The solid phase method includes a medium temperature solid phase reaction and a high temperature solid phase reaction. The reaction requires no solvent, less pollution, and convenient operation, and the synthesized powder can avoid the occurrence of hard agglomeration. The disadvantage is that the material diffusion between the solid phase and the solid phase is difficult, and the reaction takes a long time.
 
The gas-solid reaction method has a direct nitridation method and an ammonia solution method. The required equipment is simple and the reaction conditions are mild.
The synthetic powder has a high specific surface area. However, ammonia gas is irritating and easily causes environmental pollution. The binding force between nitrogen atoms is strong, and the reaction requires high temperature conditions.
 
Combustion synthesis methods mainly include solid phase combustion reaction synthesis and liquid phase combustion reaction synthesis. The synthesis process is simple, economical, and has a high reaction rate. Since the reaction is completed in a very short time, the reaction process is difficult to control.