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preparation of cu‑al 2 o 3 /Method of graphite composite coating powder

A technology of cu-al2o3 and coating powder, which is applied in the direction of transportation and packaging, metal processing equipment, coating, etc., can solve the problems of self-strength reduction, low bonding strength, carbon pull-out or falling off, etc., and achieve high-temperature softening temperature , solve the effect of low bonding strength and improve the bonding ability

Active Publication Date: 2018-02-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are two problems in the sealing material of Cu-graphite end and its service process: (1) Due to the large difference in density between copper powder and graphite powder, the Cu-C sealing material manufactured by powder metallurgy after direct mixing has the situation of component segregation , so that it may become a source of defects in the actual service process. The interface of the material is only mechanically engaged, and the bonding strength is low. When the load is applied, it is easy to cause carbon to pull out or fall off, resulting in material failure.
(2) The matrix copper of the Cu-C composite material will obviously reduce its own strength at high temperature, making the composite material soft, resulting in uneven force and deformation of the material during the grinding process, resulting in poor sealing effect, thus losing the sealing effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Target preparation of 100gCu-Al of set mass percentage 2 o 3 / Graphite composite coating powder, wherein the mass percentages are Cu containing 89%, Al 2 o 3 Contains 1%, graphite contains 10%;

[0027] 1gAl 2 o 3 The amount of the substance is about 0.010mol, and the AlCl with a concentration of 0.1mol / L 3 solution and NaOH solution, the volume ratio is 1:3, configure 400mL of Al(OH) 3 Colloidal solution; 89g of copper powder needs to be replaced by 90.4g of zinc powder, so weigh 90.4g of zinc powder, then weigh 10g of graphite powder, and mix it evenly in a ball mill;

[0028] Configure CuSO with a concentration of 0.5mol / L and a volume of 4L 4 solution; the CuSO 4 Solution with Al(OH) 3 Pour the colloidal solution into the stirring device at a stirring rate of 600rpm, then slowly add the zinc-graphite mixed powder, and stir at 20°C for 2h;

[0029] The stirred solution was vacuum filtered, and the obtained mixture was dried in a vacuum oven at 80°C for 8 ho...

Embodiment 2

[0032] Target preparation of 100gCu-Al of set mass percentage 2 o 3 / Graphite composite coating powder, wherein the mass percentages are Cu containing 84.5%, Al 2 o 3 Contains 0.5%, graphite contains 15%;

[0033] 0.5gAl 2 o 3 The amount of the substance is about 0.005mol, and the concentration is 0.1mol / L of AlCl 3 solution and NaOH solution, the volume ratio is 1:3, configure 200mL of Al(OH) 3 Colloidal solution; 84.5g copper powder needs 85.8g zinc powder to replace, so weigh 85.8g zinc powder, then weigh 15g graphite powder, and mix it uniformly in a ball mill;

[0034] Configure CuSO with a concentration of 0.5mol / L and a volume of 3.8L 4 solution; the CuSO 4 Solution with Al(OH) 3 Pour the colloidal solution into the stirring device at a stirring rate of 800rpm, then slowly add the zinc-graphite mixed powder, and stir at 40°C for 1h;

[0035] The stirred solution was vacuum filtered, and the obtained mixture was dried in a vacuum oven at 80°C for 8 hours, and t...

Embodiment 3

[0038] Target preparation of 100gCu-Al of set mass percentage 2 o 3 / Graphite composite coating powder, wherein the mass percentages are Cu containing 59.8%, Al 2 o 3 Contains 0.2%, graphite contains 40%;

[0039] 0.2gAl 2 o 3 The amount of the substance is about 0.002mol, and the concentration is 0.1mol / L of AlCl 3 solution and NaOH solution, the volume ratio is 1:3, configure 80mL of Al(OH) 3 Colloidal solution; 59.8g copper powder needs 60.7g zinc powder to replace, so weigh 60.7g zinc powder, then weigh 40g graphite powder, and mix it uniformly in a ball mill;

[0040] Configure CuSO with a concentration of 0.5mol / L and a volume of 2.9L 4 solution; the CuSO 4 Solution with Al(OH) 3 Pour the colloidal solution into the stirring device, the stirring rate is 1000rpm, then slowly add the zinc-graphite mixed powder, and stir at 45°C for 1h;

[0041] The stirred solution was vacuum filtered, and the obtained mixture was dried in a vacuum oven at 80°C for 8 hours, and t...

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Abstract

The invention discloses a method for preparing Cu-Al 2 o 3 / graphite composite coated powder method, the method is to Al(OH) 3 Colloidal solution and zinc and graphite mixed powder were added to excess CuSO 4 solution, stirred and reacted to obtain Cu‑Al(OH) 3 ‑Graphite mixture, separated by filtration, the resulting Cu‑Al(OH) 3 ‑graphite mixture is vacuum-dried and placed in a protective atmosphere for heat treatment to obtain the final product; the copper-graphite prepared by this method has high bonding strength, high softening temperature, high strength and hardness, and overcomes the problem of copper in existing copper-carbon composite materials. Powder and graphite powder have low bonding strength, low softening temperature, low strength and other defects.

Description

technical field [0001] The present invention relates to a Cu-Al 2 o 3 / The preparation method of graphite composite coating powder, particularly relates to a kind of high temperature resistant high strength Cu-Al 2 o 3 The invention relates to a preparation method of a graphite composite coating powder sealing material, which belongs to the technical field of sealing materials. Background technique [0002] With the rapid development of aerospace technology, higher requirements are placed on the performance of materials. The friction ring material used for the end face seal of the heavy-duty launch vehicle engine requires high strength, good wear resistance and low friction coefficient. Copper-carbon composite materials have the advantages of high strength of copper materials, good electrical and thermal conductivity and good self-lubrication of carbon materials, good resistance to welding, and arc ablation resistance. They are currently ideal end face sealing materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02
CPCB22F9/24B22F1/17
Inventor 邹俭鹏刘咏吕信群唐宁馨
Owner CENT SOUTH UNIV
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