Preparation method of chromium nitride

A technology of chromium nitride and metal chromium powder, applied in the direction of nitrogen-metal/silicon/boron binary compound, etc., can solve the problems of high oxygen content, equipment corrosion, air pollution, etc., and achieve simple production process and easy raw materials. Effect

Inactive Publication Date: 2013-09-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials used in this method are not easy to preserve, and harmful gases will be produced in the reaction, causing corrosion of equipment and air poll

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Using 200-250 mesh metal chromium powder with a chromium content of 99.95% as the raw material, weigh about 5g of the raw material and put it into a graphite crucible. The graphite crucible was placed in an atmosphere furnace, and the gas-solid reaction was carried out in an industrial-grade ammonia environment. The synthesis temperature is 800°C, the temperature is kept for 20 hours, and ammonia gas is continuously fed. Control the oxygen pressure in the furnace to be 1.013×10 4.55 Pa, the nitrogen pressure is 1.013×10 3.11 Pa. After the reaction was completed, it was cooled to room temperature in an ammonia stream, and the product was taken out and thoroughly ground to a powder.

[0019] The chromium nitride synthesized by the method is analyzed by XRD, only has the phase of chromium nitride, and no characteristic peaks of other impurities are observed, and the oxygen content is 2.38%.

Embodiment 2

[0021] This example provides a kind of preparation method of chromium nitride, and its specific preparation process and steps are as follows:

[0022] Using 200-250 mesh metal chromium powder with a chromium content of 99.95% as the raw material, weigh about 5g of the raw material and put it into a graphite crucible. The graphite crucible was placed in an atmosphere furnace, and the gas-solid reaction was carried out in an industrial-grade ammonia environment. The synthesis temperature is 1000°C, the temperature is kept for 10 hours, and ammonia gas is continuously fed. Control the oxygen pressure in the furnace to be 1.013×10 4.57 Pa, the nitrogen pressure is 1.013×10 5.01 Pa. After the reaction was completed, it was cooled to room temperature in an ammonia stream, and the product was taken out and thoroughly ground to a powder.

[0023] The chromium nitride synthesized by the method is analyzed by XRD, only has the phase of chromium nitride, and no characteristic spectru...

Embodiment 3

[0025] Using 200-250 mesh metal chromium powder with a chromium content of 99.95% as the raw material, weigh about 5g of the raw material and put it into a graphite crucible. The graphite crucible was placed in an atmosphere furnace, and the gas-solid reaction was carried out in an industrial-grade ammonia environment. The synthesis temperature is 1200°C, the temperature is kept for 4 hours, and ammonia gas is continuously fed. Control the oxygen pressure in the furnace to be 1.013×10 4.58 Pa, the nitrogen pressure is 1.013×10 6.41 Pa. After the reaction was completed, it was cooled to room temperature in an ammonia stream, and the product was taken out and thoroughly ground to a powder.

[0026] The chromium nitride synthesized by the method is analyzed by XRD, only has the phase of chromium nitride, and no characteristic spectrum peaks of other impurities are observed, and the oxygen content is 3.98%.

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Abstract

The present invention relates to a preparation method of chromium nitride, and belongs to the technical field of inorganic non-metallic material preparation. In the method, metal chromium powder is taken as raw material, the granularity of which is more than 200 meshes and high purity reagent is at least 3.5N. A crucible containing the raw material is placed in an atmosphere-controllable high-temperature furnace for high-temperature reaction synthesis in flowing ammonia at a temperature of 800-1200 DEG C for 2-20 hours, wherein the oxygen pressure in furnace ranges from 1.013*104.55 to 1.013*104.58 Pa, and the nitrogen pressure ranges from 1.013*103.11 to 1.013*106.41Pa. The resultant is cooled to room temperature in ammonia flow after the completion of reaction to obtain a product and the product is taken out and is fully grinded to powder. The chromium nitride prepared by the invention is analyzed by XRD and only has chromium nitride phase, wherein characteristic peaks of other impurities are not observed; other impurities are not contained; and oxygen content is less than 1.65%. The production process is simple and the raw material can be easily preserved and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of chromium nitride, which belongs to the technical field of preparation of inorganic non-metallic materials. Background technique [0002] Chromium nitride has many excellent properties, such as high hardness, high melting point, low coefficient of friction, and good electrical conductivity. Due to its super hardness and good corrosion and oxidation resistance, chromium nitride is often used as a protective coating and superhard material, which is a better wear-resistant material than titanium nitride, which is widely used at present. At the same time, chromium nitride is the only material with antiferromagnetism among nitrides, and it is widely used in magnetism. In addition, chromium nitride has important applications in metallurgical industry, electronic industry, high-temperature structural ceramics, and microelectronic devices. [0003] At present, the preparation methods of chromium nitride mainly ...

Claims

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Application Information

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IPC IPC(8): C01B21/06
Inventor 甄强李玲李榕王亚丽布乃敬
Owner SHANGHAI UNIV
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