Preparation method for SiC and graphite hybrid reinforced copper-based surface composite material

A surface composite material, copper-based technology, applied in the direction of manufacturing tools, parts of molding machines, casting and molding equipment, etc., can solve the problems of unfavorable bulk large-scale material preparation, thin composite layers, etc., to achieve low production costs and design freedom. Large, simple and flexible effect

Inactive Publication Date: 2014-07-02
XIAN UNIV OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing SiC and graphite hybrid reinforced copper-based surface composite materials, which solves the shortcomings of the existing copper-based surface modification technology that the composite layer is relatively thin, which is not conducive to the preparation of large bulk materials

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  • Preparation method for SiC and graphite hybrid reinforced copper-based surface composite material
  • Preparation method for SiC and graphite hybrid reinforced copper-based surface composite material
  • Preparation method for SiC and graphite hybrid reinforced copper-based surface composite material

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preparation example Construction

[0031] The invention provides a method for preparing a SiC and graphite hybrid reinforced copper-based surface composite material. The preparation method of SiC and graphite hybrid reinforced copper-based surface composite material is prepared by using the lost pattern negative pressure casting infiltration method, which is used to solve the problem of traditional copper alloy wear resistance. The problem of insufficiency. Such as figure 1 As shown, specifically follow the steps below,

[0032] step 1

[0033] Surface pretreatment of SiC particles: put SiC particles in clean water, put them in an ultrasonic cleaner for 10-15 minutes to remove the dust doped in SiC particles; then place the washed SiC particles in a SHD electric drying oven , bake at a temperature of 200-300°C for one hour to remove volatile pollutants adsorbed on the surface of SiC particles; after SiC particles drop to room temperature, put SiC particles in acetone for ultrasonic cleaning for 10-15 minutes,...

Embodiment 1

[0042] Select 600μm SiC particles for surface pretreatment. The treatment method is: put SiC particles in clean water, put them in an ultrasonic cleaner for cleaning for 10-15 minutes, and rough wash to remove the dust doped in SiC particles; then wash the SiC particles The particles are placed in an SHD electric drying oven and baked at 200-300°C for 1 hour to remove the volatile pollutants adsorbed on the surface of the particles; when the temperature is lowered to room temperature, put the SiC particles in acetone for ultrasonic cleaning for 10-15 minutes, repeat 2~3 times, using the principle of similar compatibility of organic solvents to wash off impurities such as residual organic matter on the surface of SiC particles, and then drying at 120~150°C. A mixture of 90% surface-treated 600 μm SiC particles, 4% 425 μm graphite particles, 2% boric acid, 2% sodium fluoride, 2% clay and 20% water in the total mass of the mixture was stirred evenly , to prepare the required pref...

Embodiment 2

[0044] Select 400μm SiC particles for surface pretreatment. The treatment method is: put SiC particles in clean water, put them in an ultrasonic cleaner for cleaning for 10-15 minutes, and rough wash to remove the dust doped in SiC particles; then wash the SiC particles The particles are placed in an SHD electric drying oven, and baked at 200-300°C for about 1 hour to remove volatile pollutants adsorbed on the surface of the particles; when the temperature is lowered to room temperature, put the SiC particles in acetone for ultrasonic cleaning for 10-15 minutes, Repeat 2 to 3 times, use the principle of similar compatibility of organic solvents to wash off impurities such as residual organic matter on the surface of SiC particles, and then dry at 120~150°C. Mix surface-treated 400 μm SiC particles with a mass fraction of 88%, 6% 450 μm graphite particles, 2% boric acid, 2% sodium fluoride, and 2% clay, and add 25% water to the total mass of the mixture, Stir evenly to prepare ...

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Abstract

The invention discloses a method for preparing a SiC and graphite hybrid reinforced copper-based surface composite material. SiC particles are pretreated, mixed with graphite particles, and then a binder, boric acid and sodium fluoride are added to obtain a prefabricated paste, and the foam is coated. surface, dry and assemble with the pouring system; then paint the lost foam casting refractory coating, bake and dry at low temperature; put the prepared pouring system and assembly model into the sand mold, smelt the brass after vacuuming, and use phosphorus Copper is deoxidized, charcoal is used as a covering agent, after the copper is completely melted and reaches the set pouring temperature, the pouring is completed under negative pressure, and after a certain negative pressure casting infiltration time is maintained, it is cooled and then cut and polished. The surface of the composite layer of SiC and graphite hybrid reinforced copper-based surface composite material prepared by the method of the present invention is relatively smooth, the distribution of reinforcement particles is relatively uniform, the thickness can reach 2-2.5 mm, the interface between the composite layer and the matrix is ​​well bonded, and there is no obvious agglomeration phenomenon .

Description

technical field [0001] The invention belongs to the technical field of preparation of metal-based surface composite materials, and relates to a method for preparing particle-mixed reinforced metal-based surface composite materials, in particular to a method for preparing SiC and graphite hybrid-reinforced copper-based surface composite materials. Background technique [0002] The research on the surface modification of materials is an important branch of the development of materials science. It improves or enhances the surface properties of materials through various technical methods without greatly changing the basic properties of raw materials, so that the functions of materials are more in line with modern high-tech requirements. Requirements, research on the surface modification of materials can not only improve the life of parts and reduce wear, but also greatly improve economic benefits. As far as wear-resistant materials are concerned, surface modification is also par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/10B22C9/04B22C19/00
Inventor 周永欣苑凌霄吕振林
Owner XIAN UNIV OF TECH
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