Aluminum-based composite material for composite pan bottom of stainless steel pan and preparation method thereof

A technology of aluminum matrix composite material and stainless steel pot is applied in the field of aluminum matrix composite material and its preparation, which can solve the problems of delamination and easy deformation.

Inactive Publication Date: 2010-08-04
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an aluminum-based composite material for stainless steel composite pot bottom materials in order to improve the existing pure aluminum or aluminum alloy used as stainless steel composite pot bottom materials, which are easy to deform and delaminate during use , the present invention also provides the preparation method of above-mentioned aluminum-based composite material

Method used

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  • Aluminum-based composite material for composite pan bottom of stainless steel pan and preparation method thereof
  • Aluminum-based composite material for composite pan bottom of stainless steel pan and preparation method thereof
  • Aluminum-based composite material for composite pan bottom of stainless steel pan and preparation method thereof

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Embodiment 1

[0024] The particle-reinforced aluminum matrix composite material of this embodiment uses SiC particles as reinforcing particles, industrial pure aluminum (99.7%) as the matrix, the average particle size of SiC particles is 80 μm, and is uniformly distributed in the matrix, and the mass percentage of SiC particles is 10%.

[0025] The specific preparation method is as follows: Weigh 80μm SiC particles that account for 10% of the total weight of the substrate. The SiC particles are ultrasonically cleaned and calcined at 950°C for 4 hours, and then placed in a furnace to be preheated to 600°C. Preheated particles can be avoided on the one hand. It causes the temperature of the molten aluminum to decrease too quickly, and on the other hand, it can reduce the gas adsorption layer on the surface of the particles. Take about 1kg of pure aluminum ingot cut into small pieces and put it in a flat-bottomed carbon steel crucible with a diameter of 105mm (the crucible is sprayed with paint...

Embodiment 2

[0027] Based on Example 1, a SiC particle reinforced aluminum matrix composite material with a particle content of 20% of the total weight of the substrate was prepared, and 50 μm SiC particles accounting for 20% of the weight of the substrate were weighed. About 1kg of aluminum ingots were melted in a resistance furnace at 700°C Introduce Ar gas for refining for 15min, add Mg blocks that account for 3% of the mass of the aluminum matrix, and heat up to 730 ° C for stirring. The stirring parameters are: the diameter of the stirring paddle is 50 mm, the inclination angle of the paddle is 45°, the stirring speed is 700rpm, and the position of the stirring paddle can be at The height of 20% melt from the bottom of the crucible can be adjusted up and down to obtain better particle dispersion speed and dispersion quality. The stirring time is 45 minutes, and the temperature is gradually lowered to 720 °C for 1 minute to extract slag, and gravity casting is performed. The 20% SiC / Al ...

Embodiment 3

[0029] The particle-reinforced aluminum matrix composite material of this embodiment uses A356 aluminum alloy as the matrix, weighs about 1 kg of aluminum alloy block into the crucible, and melts it at 680 ° C and presses it into the Mg block accounting for 2% of the mass of the aluminum matrix with a bell jar to melt and keep stirring for 5 minutes. Homogenize, heat up to 730°C, pour in Ar gas for refining for 15min, add 0.06% Sr modifier and slowly stir for 10min, and stir after slag extraction. The stirring parameters are: stirring paddle diameter 50mm, paddle inclination angle 30°, stirring speed 780rpm , the position of the stirring blade is 20% of the height of the melt level at the bottom of the crucible, and the 50 μm Al, which accounts for 10% of the weight of the matrix after calcination at 900 °C for 2 hours, is uniformly added through the feeding funnel. 2 O 3 Particles, stirred for 30 minutes, cooled to 720 ℃ and cast into shape after slag extraction.

[0030]The...

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Abstract

The invention relates to an aluminum-based composite material for the composite pan bottom of a stainless steel pan and a preparation method thereof. The aluminum-based composite material consists of an aluminum-based body and reinforced particles, wherein the aluminum-based body is pure aluminum or an aluminum alloy; the reinforced particles are any one of SiC, Al2O3, B4C or SiO2 particles; the particle diameter is between 30 and 100 mu m; the volume fraction is between 5 and 30 percent; and the reinforced particles are uniformly distributed in the aluminum-based body and has good combination with the interface of the aluminum-based body. The preparation method comprises the following steps of: smelting aluminum in a resistance furnace, adding proper active elements into the resistance furnace after refining, adding a certain amount of treated particles into the resistance furnace under the protection of atmosphere, stirring, pouring and molding. A product has high specific stiffness, good composite matching with stainless steel (thermal expansion coefficient is close to that of stainless steel) and high heat conductivity; and the prepared composite pan bottom has the characteristics of light weight, difficult deformation, uniform heat transfer and the like.

Description

technical field [0001] The invention relates to an aluminum-based composite material and a preparation method thereof, in particular to an aluminum-based composite material used as a composite bottom of a stainless steel pot and a preparation method thereof. Background technique [0002] Particle-reinforced aluminum matrix composites have the advantages of high specific strength, specific stiffness, wear resistance, low thermal expansion coefficient, high temperature performance and dimensional stability. It is mainly composed of aluminum or aluminum alloy matrix and reinforced ceramic particles, and the physical and mechanical properties of the composite can be designed by adding different content of reinforced particles. In particular, the thermal expansion coefficient of composite materials can be adjusted in a wide range, while the thermal expansion coefficient of ordinary aluminum alloys is large and difficult to change in a wide range. Therefore, the use of particle-r...

Claims

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Application Information

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IPC IPC(8): C22C21/00B22D19/02
Inventor 马立群王传廷尹明勇刘真云赵相玉丁毅张华陈育贵
Owner NANJING UNIV OF TECH
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