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Production method of chrome carbide powder

A production method and a chromium carbide technology, applied in the field of powder metallurgy production, can solve the problems of high temperature control requirements, environmental pollution, low output, etc., and achieve the effects of wide source of raw materials, high density and stable product quality

Inactive Publication Date: 2011-05-18
锦州市金属材料研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is to overcome chromium oxide Cr 2 o 3 The production of chromium carbide by reduction carbonization has the problems of low output, high temperature control requirements, and environmental pollution. It provides a production method of chromium carbide powder with simple production process, high output, stable quality, high efficiency and environmental protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1.1. Crushing metal chromium with a chromium content greater than 98% into metal chromium powder, the particle size of the metal chromium powder is less than 0.35mm;

[0020] 1.2. Mix metal chromium powder and graphite powder evenly in a ratio of 89.5% by weight: 10.5%. The purity of graphite powder is greater than 99%. Add 1% methyl cellulose by weight to the above mixture, and mix well Compression molding, molding pressure 5KN / cm 2 , put it in the drying room to dry after forming, and obtain the forming block material, the shape of the forming block material is brick shape;

[0021] 1.3. Place the dried forming block in a high-temperature vacuum furnace, and carry out vacuum carbonization reaction on metal chromium powder and graphite powder to generate chromium carbide sintered block. The vacuum carbonization reaction is divided into two stages, the first stage is Pre-carbonization, first vacuum, when the vacuum reaches 5Pa, start to heat up, after 8 hours, raise th...

Embodiment 2

[0024] 2.1. Crushing metal chromium with a chromium content greater than 98% into metal chromium powder, the particle size of the metal chromium powder is less than 0.35mm;

[0025] 2.2. Mix metal chromium powder and carbon black at a ratio of 86.5% by weight: 13.5%, and the purity of carbon black is greater than 99%. Add 1.5% carboxymethyl cellulose by weight to the above mixture, and mix well Post-compression molding, molding pressure 10KN / cm 2 , put it in the drying room to dry after forming, and obtain the forming block material, the shape of the forming block material is brick shape;

[0026] 2.3. Place the dried forming block in a high-temperature vacuum furnace, and carry out vacuum carbonization reaction on metal chromium powder and carbon black to generate chromium carbide sintered block. The vacuum carbonization reaction is divided into two stages, the first stage is Pre-carbonization, first vacuum, when the vacuum reaches 20Pa, start to heat up, after 10 hours, rai...

Embodiment 3

[0029] 3.1. Crushing metal chromium with a chromium content greater than 98% into metal chromium powder, the particle size of the metal chromium powder is less than 0.35mm;

[0030] 3.2, the mixture of metal chromium powder, graphite powder and carbon black is mixed evenly in the ratio of 76%: 24% by weight, the ratio of graphite powder and carbon black is not limited, and the purity of graphite powder and carbon black is greater than 99%. Add 3% phenolic resin to the mixture according to the weight ratio, mix it evenly and press it into shape, the molding pressure is 8KN / cm 2 , after forming, put it in a drying room to dry to obtain a forming block, the shape of the forming block is cylindrical;

[0031] 3.3. Place the dried forming block in a high-temperature vacuum furnace, and carry out vacuum carbonization reaction on the mixture of metal chromium powder, graphite powder and carbon black to generate chromium carbide sintered block. The vacuum carbonization reaction is div...

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Abstract

The invention provides a production method of chrome carbide powder, which particularly comprises the steps as follows: smashing metal chrome into metal chrome powder; evenly mixing the metal chrome powder with carbon according to the weight ratio of (76 to 91%): (24 to 9%), adding 0-3% of agglomerant into the mixture according to the weight ratio, and pressing to be formed after evenly mixing; putting dried and formed lump materials in a high-temperature vacuum furnace, vacuumizing, rising the temperature when the vacuum degree reaches 5-40 Pa for 6-12 hours, rising the temperature to1200-1400 DEG C, preserving the temperature for 1-5 hours, keeping the vacuum degree within the range of 20-100 Pa, rising the temperature to 1400-1800 DEG C for 2-8 hours, preserving the temperature for 1-5 hours, keeping the vacuum degree within the range of 20-100 Pa, powering off and reducing the temperature after preserving the temperature, stopping vacuumizing, charging argon into the furnace, and discharging chrome carbide agglomerates out of the furnace when the pressure in the furnace is 0.05-0.1MPa, and the temperature is reduced to 80 DEG C; and smashing the chrome carbide agglomerates to obtain the chrome carbide powder.

Description

technical field [0001] The invention belongs to the field of powder metallurgy production, in particular to a production method of chromium carbide powder. Background technique [0002] Chromium carbide is an inorganic cermet material with good wear resistance, corrosion resistance, oxidation resistance, high melting point (1870°C) and high bonding strength in a high temperature environment of 1000-1100 ° C. Chromium carbide is widely used in industry due to its special high temperature performance It is widely used in production and is widely used as thermal spraying material for metal surface protection process, electrode or flux cored wire for surfacing welding and cemented carbide additive. In the prior art, the production of chromium carbide powder is based on the oxide Cr of chromium 2 o 3 And carbon as raw material, the equipment adopts traditional small carbon tube furnace, and hydrogen protection is used to reduce carbonization during the carbonization process. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/30
Inventor 王明秋黎明吴岩刚王凯
Owner 锦州市金属材料研究所
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