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Preparation method for nano chromium carbide powder

A nano-chromium carbide, powder technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of high cost, achieve low cost, speed up the reaction, and avoid impurities.

Active Publication Date: 2015-09-23
HANDAN LANDE ATOMIZATION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high cost and is not suitable for industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Dissolve 252g of ammonium dichromate in 1000mL of hydrochloric acid aqueous solution with a pH value of 1, and add 10mL of dodecyltrimethylammonium chloride aqueous solution with a mass fraction of 0.5%;

[0022] (2) Heat the aqueous solution described in step (1) to 90°C under stirring, add 324g of glucose, stir and react for 1 hour, and keep warm at 90°C for 2 hours to obtain a hydrated chromium oxide slurry;

[0023] (3) Send the hydrated chromium oxide slurry into the spray drying tower for spray drying to remove water. The inlet temperature of the spray dryer is 280°C, and the outlet temperature is 100°C to obtain a precursor composed of hydrated chromium oxide and glucose;

[0024] (4) Put the above precursor in a vacuum furnace, heat it at 300°C for 1 hour, 500°C for 1 hour, and 800°C for 1 hour to obtain nano-chromium carbide powder. Out of the furnace, the nano-chromium carbide powder with an average particle size of 25 nanometers and a purity of >99.95% is...

Embodiment 2

[0032] (1) Dissolve 400g of ammonium dichromate in 1000mL of hydrochloric acid aqueous solution with a pH value of 2, and add 15mL of dodecyltrimethylammonium chloride aqueous solution with a mass fraction of 0.5%;

[0033] (2) Heat the aqueous solution described in step (1) to 80°C under stirring, add 510g of glucose, stir and react for 1.5 hours, and keep warm at 90°C for 3 hours to obtain a hydrated chromium oxide slurry;

[0034] (3) Send the hydrated chromium oxide slurry into the spray drying tower for spray drying to remove water. The inlet temperature of the spray dryer is 300°C, and the outlet temperature is 100°C to obtain a precursor composed of hydrated chromium oxide and glucose;

[0035] (4) Put the above precursor in a hydrogen-protected tube furnace, heat at 300°C for 1.5 hours, 500°C for 1 hour, and 900°C for 0.5 hours to obtain nano-chromium carbide powder. Hours, cooling out of the furnace to obtain nano-chromium carbide powder with an average particle size ...

Embodiment 3

[0037] (1) Dissolve 600g of ammonium dichromate in 1000mL of hydrochloric acid aqueous solution with a pH value of 3, and add 10mL of dodecyltrimethylammonium chloride aqueous solution with a mass fraction of 1%;

[0038] (2) Heat the aqueous solution described in step (1) to 90°C under stirring, add 750g of glucose, stir and react for 1 hour, and keep warm at 100°C for 2.5 hours to obtain a hydrated chromium oxide slurry;

[0039] (3) Send the hydrated chromium oxide slurry into the spray drying tower for spray drying to remove water. The inlet temperature of the spray dryer is 350°C, and the outlet temperature is 80°C to obtain a precursor composed of hydrated chromium oxide and glucose;

[0040] (4) Put the above precursor in a hydrogen-protected box-type electric furnace, heat it at 300°C for 1 hour, 500°C for 1.5 hours, and 1000°C for 1 hour to obtain nano-chromium carbide powder. Hours, cooling out of the furnace to obtain nano-chromium carbide powder with an average par...

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Abstract

The invention discloses a preparation method for nano chromium carbide powder, and belongs to the technical field of preparation of inorganic materials. The preparation method comprises the following steps: adding saccharose or glucose into ammonium dichromate serving as a raw material under an acidic condition, reducing ammonium dichromate to generate chromic hydroxide nano particles, then performing spray drying for dewatering, putting dewatered raw materials into a reaction furnace, carrying out thermal treatment under hydrogen protection atmosphere or vacuum, decomposing the chromic hydroxide nano particles into chromic oxide nano particles, and carbonizing the newly generated active chromic oxide particles into a chromium carbide nano material by the saccharose or glucose. The prepared nano chromium carbide is high in purity, high in dispersivity, large in specific surface area and uniform in particle size distribution. By simple adjustment on the acidicity or the carbonization temperature of the experiment, nano chromium carbide powder of different particle sizes from 20 to 100 can be obtained. The method has the characteristics of readily available raw materials, low cost, no use of an organic solvent, simple production technology, suitability for large-scale production and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer metal carbide powder preparation, in particular to a preparation method of nanometer chromium carbide. Background technique [0002] Chromium carbide has a high melting point, hardness and high temperature strength, and has been widely used as a grain growth inhibitor of cemented carbide. In addition, chromium carbide can also be used as spray powder. Chromium carbide-25%NiCr spray powder has good oxidation resistance, corrosion resistance and wear resistance at high temperature, so it has been widely studied in the aerospace field. [0003] At present, the preparation method of chromium carbide is usually prepared by a high-temperature reduction carbonization method of mixing dichromium trioxide and carbon black. Chinese patent CN1176224A proposes a method for preparing chromium carbide powder: using chromium oxide as the main raw material, using carbon as a reducing agent, and according to a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/30B82Y30/00
Inventor 刘文胜
Owner HANDAN LANDE ATOMIZATION EQUIP CO LTD
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