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Preparation method of titanium carbide-based cermet powder material for thermal spraying

A technology of ceramic powder and titanium carbide, which is applied in metal material coating process, coating, fusion spraying, etc., can solve the requirements of difficult thermal spraying powder particle size, difficult to meet thermal spraying powder, poor metal wettability and other problems, Achieve the effects of no passivation film, short synthesis time, and improved bonding strength

Inactive Publication Date: 2011-08-31
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of industrially preparing titanium carbide powder is mainly to use TiO 2 Carbon black is used as raw material and carbonized in a high-temperature tube furnace. The particle size of the prepared powder is relatively fine, and it is difficult to directly meet the particle size requirements of thermal spraying powder. Granulation is also difficult to meet the needs of thermal spray powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 640g of titanium powder, 160g of graphite powder, 60g of iron powder, 80g of nickel powder, 40g of molybdenum powder, 20g of tungsten powder, and 20g of vanadium powder, put them into a ball mill jar, add 2000g of steel balls, and use a rolling ball mill for ball milling. The rotation speed is 50rpm, the charging coefficient is 0.7, and the ball milling time is 3h. After the mixing is completed, use a powder molding press to press the mixture into a briquette with a diameter of 100mm, place the briquette in a self-propagating high-temperature synthesis reactor, and pass argon gas at a flow rate of 0.5L / min for 10 minutes, and then remove the reactor In the air, the tungsten wire of the igniter is energized to ignite the compact, and the whole compact is ignited to undergo a self-propagating reaction. After the reaction is completed, the mechanical pump is turned on to vacuumize the reactor to keep the vacuum degree of the reactor at 10-20Pa, and the reaction produc...

Embodiment 2

[0025] Take by weighing titanium powder 640g, graphite powder 160g, nickel powder 110g, cobalt powder 20g, chromium powder 70g, put into ball mill jar, add 1500g steel ball, utilize rolling ball mill to carry out ball mill mixing, ball mill rotating speed 60rpm, charge factor 0.6, Ball milling time 4h. After the mixing is completed, use a powder molding press to press the mixture into a briquette with a diameter of 80mm, place the briquette in a self-propagating high-temperature synthesis reactor, and pass argon gas at a flow rate of 0.8L / min for 8 minutes, and then remove the reactor In the air, the tungsten wire of the igniter is energized to ignite the compact, and the whole compact is ignited to undergo a self-propagating reaction. After the reaction is completed, the mechanical pump is turned on to vacuumize the reactor to keep the vacuum degree of the reactor at 10-20Pa, and the reaction product is cooled to room temperature with the furnace. , to obtain a loose and poro...

Embodiment 3

[0027] Weigh 720g of titanium powder, 180g of graphite powder, 30g of nickel powder, and 70g of tungsten powder, put them into a ball mill jar, add 2500g of steel balls, and use a rolling ball mill for ball mill mixing. The ball mill speed is 45rpm, the charging coefficient is 0.75, and the ball mill time is 3.5h . After the mixing is completed, use a powder molding press to press the mixture into a briquette with a diameter of 85mm, place the briquette in a self-propagating high-temperature synthesis reactor, and pass argon gas at a flow rate of 0.7L / min for 17 minutes, and then remove the reactor In the air, the tungsten wire of the igniter is energized to ignite the compact, and the whole compact is ignited to undergo a self-propagating reaction. After the reaction is completed, the mechanical pump is turned on to vacuumize the reactor to keep the vacuum degree of the reactor at 10-20Pa, and the reaction product is cooled to room temperature with the furnace. , to obtain a ...

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Abstract

The invention provides a preparation method of a titanium carbide-based cermet powder material for thermal spraying, which belongs to the field of powder materials for thermal spraying. The method comprises the following steps of: firstly, weighting titanium powder, graphite powder / soot carbon, and other metal components in a proportion to prepare raw material powder; putting the raw material powder into a ball mill pot for ball milling, briquetting the mixture to form a block after the mixing is finished, placing in a self-propagating high-temperature synthesis reactor, igniting the block after the air in the reactor is removed so that the whole block is ignited to undergo a self-propagating reaction; starting a mechanical pump to vacuumize after the reaction is finished, and cooling reaction products to room temperature with the reactor so as to obtain a loose porous titanium carbide-based cermet block; and finally, after the cermet block is taken out, removing contaminants on the surface of the cermet block, and then crushing and screening residual products to obtain titanium carbide-based cermet powder for thermal spraying in different grain sizes. The preparation method in the invention has the characteristics of short synthesis time, energy saving, environmental protection, low price, and the like, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of manufacturing powder materials (composites) for thermal spraying, and in particular provides a preparation method and powder material for titanium carbide-based cermet powder materials for thermal spraying, which are suitable for industrial production. Background technique [0002] Traditional composite powders for thermal spraying mainly include WC / Co, Cr 3 C 2 / NiCr, etc., the wear-resistant hard particles used are WC, Cr 3 C 2 etc., are generally produced by mechanical mixing method, sintering crushing method, granulation plasma spheroidization method [US Patent: 5126104] and granulation sintering method [ZL 200510020875.9]. [0003] WC-based composite powder is only suitable for environments below 500°C. If the temperature is too high, WC will oxidize and decompose, and its hardness and wear resistance will decrease, resulting in a significant decrease in the wear resistance of thermal sprayed coatings. Cr ...

Claims

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Application Information

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IPC IPC(8): B22F3/23B22F9/04C23C4/10C23C4/06
Inventor 郭志猛刘祥庆林涛温芳吴旭
Owner UNIV OF SCI & TECH BEIJING
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