Method of synthesizing nano chromium nitride powder by carbon-thermal-reduction nitriding process

A nano-nitriding and nitriding technology, applied in nitrogen-metal/silicon/boron binary compounds, nanotechnology, nanotechnology, etc., can solve the problems of difficult control of operation, dangerous yield of organic solvents, etc. Convenience, shortened reaction time, narrow particle size distribution effect

Active Publication Date: 2014-03-19
HENAN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The products prepared by the high temperature self-propagating method are in the micron range, and the operation is difficult to control
All operations of solid phase metathesis method and benzene thermal method need to be operated in a sealed box filled with a protective atmosphere, requiring high-purity raw materials, and the product contains a certain amount of carbon, which requires secondary treatment, and high-temperature treatment of organic solvents is potentially dangerous and lower yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the weight ratio, 8.10 g of nano-chromium trioxide and 1.90 g of nano-carbon black were taken, and they were placed in a high-energy ball mill, and the mixed material was obtained by dry mixing method and fully mixed. The obtained mixture was placed in a drying oven and dried at 100° C. for 1 h. Put the dried mixture in a high-temperature reaction furnace, and carry out carbothermal reduction and nitriding at 800-1100°C for 0.5-2 hours under a nitrogen atmosphere to obtain particles with an average particle size of <100nm and a uniform particle size distribution. Nano chromium nitride powder.

Embodiment 2

[0026] Take 7.35 g of nano-chromium trioxide and 2.65 g of nano-activated carbon according to the weight ratio, put them in a rolling ball mill, adopt a wet mixing method, use absolute ethanol as a dispersion medium, and mix thoroughly to prepare a mixture. The obtained mixture was placed in a drying oven and dried at 300° C. for 2 h. Put the dried mixture in a high-temperature reaction furnace, and carry out carbothermal reduction and nitriding at 800-1100°C for 0.5-2 hours under a nitrogen atmosphere to obtain particles with an average particle size of <100nm and a uniform particle size distribution. Nano chromium nitride powder.

Embodiment 3

[0028] Take 8.50 g of nano-chromium trioxide and 1.50 g of nano-carbon black according to the weight ratio, put them in a fast grinder, and adopt a dry mixing method to prepare a mixture after fully mixing. The obtained mixture was placed in a drying oven and dried at 200° C. for 0.5 h. Put the dried mixture in a high-temperature reaction furnace, and carry out carbothermal reduction and nitriding at 800-1100°C for 0.5-2 hours under a nitrogen atmosphere to obtain particles with an average particle size of <100nm and a uniform particle size distribution. Nano chromium nitride powder.

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Abstract

The invention belongs to the field of nano ceramic powder preparation and relates to a preparation method of nano chromium nitride powder. The preparation method comprises the following steps: a, getting 6.50g-8.50g of nano chromium oxide and 1.50g-3.50g of a nano carbon reducing agent in a weight ratio, placing in a mixer for dry-mixing or wet-mixing, and preparing a material mixture after sufficiently mixing; b, placing the material mixture obtained in the step a in a drying oven for drying for 1 hour-2 hours under an condition of 100 DEG C-300 DEG C; and c, placing the dried gas mixture obtained in the step b in a high-temperature reaction furnace, and under a nitrogen gas atmosphere condition, carrying out carbon-thermal-reduction nitriding for 0.5 hour-2 hours under the condition of 800 DEG C-1100 DEG C to prepare the nano chromium nitride powder with mean grain size less than 100 nm and uniform grain size distribution. The method disclosed by the invention has characteristics of being low in reaction temperature, short in reaction time, low in production cost, simple in process, and the like, and is easy for industrial production.

Description

technical field [0001] The invention belongs to the field of nano-ceramic powder preparation, and in particular relates to a method for synthesizing nano-chromium nitride powder by carbothermal reduction nitriding. [0002] Background technique [0003] Chromium nitride, a transition metal nitride, has a high melting point, hardness and high-temperature strength, as well as good thermal and electrical conductivity. Chromium nitride has good physical and mechanical properties, and is considered to be a better wear-resistant material than titanium nitride, which is widely used at present, and has been successfully applied to the protective coating of piston rings. The chromium nitride film has a series of excellent properties such as high hardness, good adhesion, dense particles, and corrosion resistance. Compared with other ceramic films, chromium nitride films have better heat resistance in practical applications. Among various nitride ceramics, chromium nitride ceramics ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06B82Y30/00
Inventor 赵志伟关春龙郑红娟王海阔陈艳毛淑芳宋伟强
Owner HENAN UNIVERSITY OF TECHNOLOGY
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