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Method for preparing SiC particle-aluminum alloy composite material cylinder liner

A composite material and aluminum alloy technology, which is applied in the field of preparation of SiC particle-aluminum alloy composite material cylinder liners, can solve problems such as difficulty in meeting the needs of industrial application of high-volume SiC particle-aluminum alloy composite material cylinder liners, etc., and achieves production equipment. The requirements are not high, the preparation process is simple, and the cost is low.

Inactive Publication Date: 2011-04-27
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above status shows that the existing process methods are difficult to meet the needs of the industrial application of high-volume SiC particle-aluminum alloy composite cylinder liners, and there is an urgent need to invent new preparation technologies for high-volume SiC particle-aluminum alloy composite cylinder liners

Method used

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  • Method for preparing SiC particle-aluminum alloy composite material cylinder liner
  • Method for preparing SiC particle-aluminum alloy composite material cylinder liner
  • Method for preparing SiC particle-aluminum alloy composite material cylinder liner

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preparation example Construction

[0016] see figure 1 with figure 2 . The steps of the preparation method of the SiC particle-aluminum alloy composite cylinder liner described in the present invention are as follows:

[0017] ① Prepare the SiC particle-aluminum alloy composite material slurry by stirring casting method, heat it to 700-750℃ and keep it for use;

[0018] ②Preheat the cylindrical mold to 350-500°C, use the centrifugal casting method, and pour the SiC particle-aluminum alloy composite material slurry into the cylindrical mold under the condition that the G parameter is 50-100g;

[0019] ③After cooling and solidification, a cylindrical casting is obtained, which is composed of a high-volume SiC particle-aluminum alloy composite annular belt 2 located near the outer diameter of the cylindrical casting and a completely SiC-free aluminum alloy annular belt located near the inner diameter of the cylindrical casting. Band 1 consists of two parts;

[0020] ④Using mechanical processing to remove the ...

Embodiment 1

[0023] Raw materials: SiC particles with an average particle size of 15.8 μm, and the aluminum alloy is AlSi9Mg alloy. The volume ratio of SiC particles to AlSi9Mg alloy is 10:90.

[0024] Weigh out 5.0kg of AlSi9Mg alloy and 0.66kg of SiC particles, carry out oxidation treatment on SiC particles at 1000°C×5h, and then cool down to 250°C for use; use resistance heating furnace to melt 5kg of AlSi9Mg alloy, after degassing and slag removal, Cool it down to 585°C, then put the agitator into the melt, and stir the melt continuously at 200rpm to uniform the temperature distribution of the melt; Gradually add the SiC particles into the AlSi9Mg alloy melt, and after stirring for a certain period of time, the SiC particle-AlSi9Mg alloy composite material semi-solid slurry can be obtained; reduce the stirring speed to 350rpm, and heat the SiC particle-AlSi9Mg alloy composite material slurry to 700°C ; Using the centrifugal casting method, take out 0.5kg of SiC with the tundish p / Al...

Embodiment 2

[0026] Raw materials: SiC particles with an average particle size of 15.8 μm, and the aluminum alloy is AlSi9Mg alloy. The volume ratio of SiC particles to AlSi9Mg alloy is 15:85.

[0027] Weigh out 5.0kg of AlSi9Mg alloy and 1kg of SiC particles, carry out oxidation treatment on SiC particles at 1000°C×5h, and then cool down to 250°C for use; melt 5kg of AlSi9Mg alloy in a resistance heating furnace, degas and remove slag, and put It cools down to 585°C, then puts the stirrer into the melt, and continuously stirs the melt at 200rpm to uniform the temperature distribution of the melt; adjust the stirrer speed to 800rpm, after the speed is stable, put the SiC particles are gradually added to the AlSi9Mg alloy melt, and after stirring for a certain period of time, a semi-solid slurry of SiC particle-AlSi9Mg alloy composite material can be obtained; reduce the stirring speed to 350rpm, and heat the SiC particle-AlSi9Mg alloy composite material slurry to 730°C; Using the centrifu...

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Abstract

The invention relates to a method for preparing a SiC particle-aluminum alloy composite material cylinder liner, which can meet the requirement of light-weight manufacturing of engines. The method comprises the following steps of: preparing SiC particle-aluminum alloy composite material slurry with volume fraction of between 10 and 20 percent by a stirring casting method; heating to the temperature of between 700 and 750 DEG C for later use; forming the SiC particle-aluminum alloy composite material slurry which is heated to the temperature of between 700 and 750 DEG C and serves as a raw material in a cylindrical mould which is preheated to the temperature of between 350 and 500 DEG C by a centrifugal casting method under the condition that a G parameter is between 50 and 100g; cooling and solidifying to obtain a cylindrical cast, wherein the cast consists of a SiC particle-aluminum alloy composite material annular belt which is distributed close to the external diameter of the cylindrical cast and has an average volume fraction of between 35 and 55 percent and an aluminum alloy annular belt which is distributed close to the internal diameter of the cylindrical cast and does not have any SiC particles; removing the aluminum alloy annular belt part which is distributed close to the internal diameter of the cylindrical cast and does not have the SiC particles by a machining method to obtain a cylindrical member which is made of a high-size SiC particle-aluminum alloy composite material; and mechanically turning and thermally processing the high-size SiC particle-aluminum alloy composite material cylindrical member and chemically corroding the inner wall of the cylinder liner to prepare a cylinder liner part. The SiC particle-aluminum alloy composite material cylinder liner prepared by the method has the characteristics of low linear expansion coefficient, high wear resistance and high thermal performance.

Description

technical field [0001] The invention relates to a method for preparing a SiC particle-aluminum alloy composite material cylinder liner. The invention can meet the requirement of light weight of the automobile, and the prepared cylinder liner has the characteristics of low coefficient of thermal expansion, excellent wear resistance and high strength at high temperature. Background technique [0002] The cylinder liner is the inner lining of the cylinder, which is usually made of gray cast iron or ductile iron. When the engine is working, it is in direct contact with the piston ring. After the cylinder body is cast, it is processed and pressed into it. [0003] Since the cylinder wall bears the stress caused by high-pressure gas and the side thrust of the piston, as well as the thermal stress caused by high-temperature gas, the cylinder liner material must have high structural strength and fatigue strength to avoid deformation of the cylinder liner or premature fatigue damage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D13/00B22D25/06F16J10/04
Inventor 王开黄笑宇李波薛寒松杨勇刘昌明
Owner CHONGQING UNIV
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