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A kind of preparation method of nanometer chromium carbide powder

A nano-chromium carbide, nano-carbon black technology, applied in chemical instruments and methods, nanotechnology, nanotechnology and other directions, can solve the problem of high cost, achieve the effect of low cost, large output and avoid agglomeration

Active Publication Date: 2017-03-01
HANDAN LANDE ATOMIZATION EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • A kind of preparation method of nanometer chromium carbide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Dissolve 200g of sodium chromate and 650g of sodium metabisulfite in 1000mL and 6500mL of water respectively;

[0025] (2) Add 10g of nano-carbon black and 2g of 25wt% sodium hexametaphosphate into the sodium chromate solution, stir and disperse in a stirring mill for 2 hours;

[0026](3) Add the sodium metabisulfite solution into the stirring mill and keep stirring for 1 hour;

[0027] (4) Pump the slurry in the stirring mill into the centrifugal filter, stop it after drying, shovel the filter cake into the stirring mill with a material shovel, add 8000mL of water at 70°C, and circulate it for 10 minutes before pumping it into the centrifugal filter for drying , after 5 times of reciprocating in this way, use 0.2mol / L barium chloride solution to drop into the thrown liquid without white precipitate;

[0028] (5) Put the filter cake into a blast drying oven, heat up to 120°C and dry for 20 hours; place the dried powder in a tube furnace, keep it warm at 500°C for 1...

Embodiment 2

[0030] (1) Dissolve 240g of sodium chromate and 750g of sodium metabisulfite in 1000mL and 7500mL of water respectively;

[0031] (2) Add 12g of nano-carbon black and 2.5g of 25wt% sodium hexametaphosphate into the sodium chromate solution, stir and disperse in a stirring mill for 2 hours;

[0032] (3) Add the sodium metabisulfite solution into the stirring mill and keep stirring for 2 hours;

[0033] (4) Pump the slurry in the stirring mill into the centrifugal filter, stop it after drying, shovel the filter cake into the stirring mill with a material shovel, add 9000mL of water at 70°C, and circulate it for 10 minutes before pumping it into the centrifugal filter for drying , after 5 times of reciprocating in this way, use 0.2mol / L barium chloride solution to drop into the thrown liquid without white precipitate;

[0034] (5) Put the filter cake into a blast drying oven, heat up to 150°C and dry for 10 hours; place the dried powder in a vacuum furnace, heat it at 500°C for ...

Embodiment 3

[0036] (1) Dissolve 500g of sodium chromate and 1600g of sodium metabisulfite in 3000mL and 8000mL of water respectively;

[0037] (2) Add 25g of nano-carbon black and 5g of 5wt% polyethylene glycol into the sodium chromate solution, stir and disperse in a stirring mill for 2 hours;

[0038] (3) Add the sodium metabisulfite solution into the stirring mill and keep stirring for 2 hours;

[0039] (4) Pump the slurry in the stirring mill into the centrifugal filter, stop it after drying, shovel the filter cake into the stirring mill with a material shovel, add 12000mL of water at 70°C, stir for 10 minutes, and then pump it into the centrifugal filter for drying , after 5 times of reciprocating in this way, use 0.2mol / L barium chloride solution to drop into the thrown liquid without white precipitate;

[0040] (5) Put the filter cake into a vacuum drying oven, heat up to 150°C and dry for 10 hours; place the dried powder in a vacuum furnace, heat it at 500°C for 1 hour, heat it u...

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Abstract

The invention relates to a preparation method for nano chromium carbide powder. The method comprises the following steps: 1, respectively preparing a sodium chromate Na2CrO4 solution and a sodium pyrosulfite Na2S2O5 solution, and adding nano carbon black and a dispersing agent into the sodium chromate solution for dispersion; 2, adding the sodium pyrosulfite solution into the sodium chromate solution dispersed with the nano carbon black, and continuously stirring for 1 to 2 hours to obtain a mixed solution; 3, performing press filtering on the mixed solution to obtain a filter cake and filtrate, flushing the filter cake by water with the temperature of 60 to 70 DEG C until no white deposit is generated in the washing liquid into which a barium chloride solution is dropped; 4, drying the filter cake, putting the filter cake into a reaction furnace, preserving the heat at the temperature of 500 DEG C for 1 to 1.5 hours under hydrogen protection atmosphere or vacuum, continuously heating to 800 to 1,000 DEG C for carbonization for 0.5 to 1 hour to obtain nano chromium carbide powder, continuously feeding carbon dioxide CO2 after carbonization, and preserving the heat for 0.5 to 2 hours to remove excessive free carbon. A basic raw material sodium chromate Na2CrO4 of chromium chemical engineering is a chromium source, so that the preparation method has the characteristics of low production cost, low carbonization temperature, 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. The mechanism of action is: when the alloy is sintered, chromium carbide is preferentially dissolved in the Co phase, preventing WC from dissolving into the Co phase, thereby effectively preventing the dissolution and precipitation process of WC. In the cooling stage, chromium carbide is dissolved in the Co phase, and the solid solution strengthens the binder phase. 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....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G37/00B82Y30/00
CPCY02P20/141
Inventor 刘文胜
Owner HANDAN LANDE ATOMIZATION EQUIP CO LTD