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Nano silicon carbide reinforced aluminum matrix composite and preparing method thereof

A technology of nano-silicon carbide and composite materials, applied in the field of materials, can solve the problems of high cost, complex preparation process, and inability to distribute nano-silicon carbide particles uniformly, and achieve the effects of improving tensile strength and hardness and improving mechanical properties.

Inactive Publication Date: 2017-11-24
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the patent of the present invention is to solve the problems that nano-silicon carbide particles cannot be evenly distributed in the aluminum matrix, the preparation process is complicated, and the cost is high, and a nano-silicon carbide-reinforced aluminum-based composite material and its preparation method are provided. Compared with pure aluminum, the hardness has been significantly improved

Method used

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  • Nano silicon carbide reinforced aluminum matrix composite and preparing method thereof

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Comparison scheme
Effect test

Embodiment 1

[0023] (1) 3% nano silicon carbide powder (particle size is 30nm) is put into the beaker that fills 250ml dehydrated alcohol, carry out ultrasonic vibration dispersion 60min, wherein the frequency of ultrasonic vibration is 60KHZ, simultaneously 97% 7075 aluminum alloy powder ( The particle size is 65μm) into a beaker filled with 250ml of absolute ethanol for electromagnetic stirring, and then under magnetic stirring, the solution containing nano-silicon carbide is added dropwise to the 7075 aluminum alloy powder solution, and then continue to stir for 35min, and let it settle After the composite powder has completely settled, pour out part of the clear liquid and place it in an oven at 90°C overnight to obtain a mixed powder. Put the composite material powder in a ball mill for 5 hours, and set the speed at 200rpm, and add about 2.0wt% of Stearic acid; (2) the resulting mixture is pressed into shape at 60MPa pressure and room temperature, and kept at 60MPa pressure for 8min; (...

Embodiment 2

[0025] (1) 5% nano silicon carbide powder (particle size is 40nm) is put into the beaker that fills 250ml dehydrated alcohol, carry out ultrasonic vibration dispersion 65min, wherein the frequency of ultrasonic vibration is 60KHZ, simultaneously 95% 7075 aluminum alloy powder ( The particle size is 30μm) into a beaker filled with 250ml of absolute ethanol for electromagnetic stirring, and then under magnetic stirring, the solution containing nano-silicon carbide is added dropwise to the 7075 aluminum alloy powder solution, and then continue to stir for 40min, and let it settle After the composite powder has completely settled, pour out part of the clear liquid and place it in a 95°C oven overnight to obtain a mixed powder. Put the composite material powder in a ball mill for 5 hours, and set the speed to 200rpm. During the process, add about 2.0wt% of Stearic acid; (2) the resulting mixture is pressed into shape at 65MPa pressure and room temperature, and kept at 65MPa pressure...

Embodiment 3

[0027] (1) 1% nano silicon carbide powder (particle size is 20nm) is put into the beaker that fills 250ml dehydrated alcohol, carry out ultrasonic vibration dispersion 55min, wherein the frequency of ultrasonic vibration is 60KHZ, simultaneously 99% 7075 aluminum alloy powder ( The particle size is 100μm) into a beaker filled with 250ml of absolute ethanol for electromagnetic stirring, then under magnetic stirring, the solution containing nano-silicon carbide is added dropwise to the 7075 aluminum alloy powder solution, and then continue to stir for 30min, and let it settle After the composite powder has completely settled, pour out part of the clear liquid and place it in an oven at 80°C overnight to obtain a mixed powder. Put the composite material powder in a ball mill for 5 hours, and set the speed to 200rpm. During the process, add about 2.0wt% of Stearic acid; (2) the resulting mixture is pressed into shape at 55MPa pressure and room temperature, and kept at 55MPa pressur...

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Abstract

The invention belongs to the field of materials, and discloses a nano silicon carbide reinforced aluminum matrix composite and a preparing method thereof. The problem that nano silicon carbide particles cannot be evenly dispersed in an aluminum matrix is solved. The composite is formed in a manner that 7075 aluminum alloy powder and nano silicon carbide powder are subject to solvent assisted dispersion, mechanical ball grinding, pressing forming, high-temperature sintering and cooling. The granularity of 7075 aluminum alloy powder ranges from 30 micrometers to 100 micrometers, the mass percent ranges from 95% to 99%, the granularity of the nano silicon carbide powder ranges from 20 nm to 40 nm, and the mass percent ranges from 1% to 5%. Nano silicon carbide particles are evenly dispersed in an aluminum matrix, and tensile strength and hardness of the composite are obviously improved.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a nano-silicon carbide reinforced aluminum-based composite material and a preparation method thereof. Background technique [0002] Silicon carbide reinforced aluminum matrix composites have the advantages of light weight, high strength, wear resistance, low thermal expansion coefficient, good dimensional stability, corrosion resistance, high temperature resistance, etc., and are ideal for aerospace, special equipment, precision instruments, transportation and other fields. An important supporting material for the lightweight development trend is a high-performance composite material that countries around the world are competing to develop. Studies have shown that the size of silicon carbide particles has an important impact on the properties of composite materials. When the silicon carbide particle size is at the nanoscale, it can cause a grain refinement mechanism and a la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C21/10C22C32/00B22F1/00B22F9/04
CPCB22F1/0003B22F9/04B22F2009/042B22F2009/043B22F2998/10C22C1/05C22C21/10C22C32/0063B22F3/02B22F3/10
Inventor 杨超戴亚春崔沛骆志高
Owner JIANGSU UNIV
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