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Composite powder of metal-metal carbide coated carbon particles and preparation method thereof

A metal carbide and composite powder technology, applied in metal processing equipment, carbon fiber, physical treatment, etc., can solve problems such as easy agglomeration, black core coating, difficult and easy dispersion of carbon, etc.

Active Publication Date: 2021-04-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the key problems are the poor wettability of the carbon and metal interface, the difficulty of uniform dispersion of carbon in the matrix, and the easy oxidation of carbon at high temperature.
Due to the light weight of graphite or granular graphite, there are a large number of active functional groups on the surface of carbon fiber, so it is easy to agglomerate and difficult to disperse in the process of mixing with other metals, resulting in uneven distribution in the matrix
[0003] In response to this problem, researchers proposed to use carbon to plate metals, such as copper, nickel, titanium, etc., but the metal plating technology has a long process flow, complex process cycle, large equipment investment, complex process, and easy occurrence of metal plating. Black center and uneven coating

Method used

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  • Composite powder of metal-metal carbide coated carbon particles and preparation method thereof
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  • Composite powder of metal-metal carbide coated carbon particles and preparation method thereof

Examples

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Effect test

Embodiment 1

[0069] In this embodiment 1, commercially available short carbon fibers that have been degummed at 700°C for 60 minutes and reduced iron powder with a particle size of 120 μm are used as ball milling raw materials. 6μm, length 2mm, the two are added to the ball milling equipment for high-energy ball milling, the speed is 250r / min, the ball milling time is 6h, the ball-to-material ratio is 6:1, the ball milling balls are stainless steel balls and hard alloy balls, the ball diameter 3mm~10mm (mass ratio of ball milling ball diameter 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm is 4:8:11:20:12:8:6:1); mixed powder after ball milling; Carry out separation process to mixed powder; The step of separation process is:

[0070]Step 1, place the mixed powder on an ultra-fine powder separation ultrasonic rotary vibrating sieve for sieving treatment, the minimum mesh size of the sieve is 2000 mesh, take the sieve and mix it with alcohol, add ultrasonic treatment for 120min (ultrasonic frequency is 2...

Embodiment 2

[0074] In Example 2, commercially available short carbon fibers that have been degummed at 750°C for 60 minutes and chromium powder with a particle size of 100 μm are used as raw materials for ball milling. The volume percentage of carbon fibers is 5%, and the volume percentage of chromium powder is 95%. , length 2mm, the two are added to the ball milling equipment for high-energy ball milling, the rotating speed is 280r / min, the ball milling time is 7h, the ball-to-material ratio is 6:1, and the mixed powder is obtained after the ball milling is completed; the mixed powder is separated; The steps of the separation process are:

[0075] Step 1, put the mixed powder on the superfine powder separation ultrasonic rotary vibrating sieve for sieving treatment, the minimum mesh size of the sieve is 2000 mesh, take the sieve and mix it with alcohol, add ultrasonic treatment for 90min (ultrasonic frequency is 25KHz), maintain The temperature of the solution is room temperature, and th...

Embodiment 3

[0078] In Example 3, commercially available short carbon fibers that have been degummed at 800°C for 60 minutes and titanium powder with a particle size of 50 μm are used as raw materials for ball milling. The volume percentage of short carbon fibers is 10%, and the volume percentage of titanium powder is 90%. The diameter of the short carbon fibers is 6μm, length 2mm, the two are added to the ball milling equipment for high-energy ball milling, the speed is 320r / min, the ball milling time is 8h, the ball-to-material ratio is 6:1, and the mixed powder is obtained after the ball milling; the mixed powder is separated. ;The steps of separation processing are:

[0079] Step 1, place the mixed powder on an ultra-fine powder separation ultrasonic rotary vibrating sieve for sieving treatment, the minimum mesh size of the sieve is 2000 mesh, take the sieve and mix it with alcohol, add ultrasonic treatment for 40min (ultrasonic frequency is 25KHz), maintain The temperature of the solu...

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Abstract

The invention relates to a metal-metal carbide-coated carbon particle composite powder and a preparation method thereof, belonging to the technical field of metal powder. The metal-metal carbide coated carbon particles include a metal layer, a metal carbide layer, and carbon particles; the metal carbide layer is coated on the surface of the carbon particles; the metal layer is coated on the surface of the metal carbide layer; The composite powder uses ultra-fine carbon particles and matrix metal powder as raw materials, and through mechanical force, the ultra-fine carbon particles penetrate and / or embed in the matrix metal powder; and then obtain a metal carbide layer by in-situ carbonization. The preparation method is as follows: : Firstly, through mechanical ball milling of degummed short carbon fibers and metal powder, a large number of ultra-fine carbon particles are evenly embedded in metal powder, and then separated and annealed at high temperature to make the carbon particles react with the surrounding metal in a solid state, and obtain a uniform coating on the surface of the carbon particles. Metal-carbon particle composite powders coated with metal carbides.

Description

technical field [0001] The invention relates to a composite powder and a preparation method thereof, in particular to a metal-metal carbide-coated carbon particle composite powder and a preparation method thereof, belonging to the technical field of material preparation. Background technique [0002] Carbon (carbon fiber, graphite, etc.) / metal matrix composites have both the high electrical and thermal conductivity and toughness of metal, the high strength and toughness of carbon fiber, and the lubricating properties of graphite, etc., and are widely used in thermal conductive materials, conductive materials, friction materials and other fields. For example, with the rapid development of my country's high-speed railways, continuous breakthroughs in operating speed, and a substantial increase in operating mileage, there is an urgent need for a large number of carbon / copper composite materials with higher comprehensive performance and stronger environmental adaptability, such a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02B22F1/00B22F9/04D06M10/00D06M11/83
CPCD06M10/00D06M11/83B22F9/04D06M2101/40B22F2009/043B22F1/142B22F1/17
Inventor 肖鹏方华婵
Owner CENT SOUTH UNIV
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