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Preparation method for boron carbide particle reinforced nanometer/ultra-fine grain aluminum based composite

An aluminum-based composite material and particle-reinforced technology, which is applied in the field of aluminum-based composite materials, can solve the problems of destroying the excellent performance of nanocomposites and the growth of nanocrystalline grains, and achieve fine grains, high preparation efficiency, and high density. Effect

Inactive Publication Date: 2017-08-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the surface effect and high activity of nanoparticles, the traditional powder metallurgy thermal cycle process can easily cause the growth of nanocrystals, which greatly destroys the excellent performance of nanocomposites.

Method used

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  • Preparation method for boron carbide particle reinforced nanometer/ultra-fine grain aluminum based composite
  • Preparation method for boron carbide particle reinforced nanometer/ultra-fine grain aluminum based composite
  • Preparation method for boron carbide particle reinforced nanometer/ultra-fine grain aluminum based composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Take 75 μm 7075 aluminum alloy powder and 2 μm boron carbide powder. By mass, 7075 powder is 92.5% mixed with boron carbide powder 7.5%, placed in a light ball mill and mixed at 150 rpm for 24 hours to obtain a composite powder;

[0035] (2) Put the composite powder uniformly mixed in step (1) into a stainless steel tank for ball milling, the ball mill speed is 400rpm, the mass ratio of ball to material is 20:1, the ball milling time is 4h, and the ball milling medium is liquid nitrogen.

[0036] (3) Put the nanocomposite powder in step (2) into a graphite mold, and put it into a vacuum furnace to exhaust, wherein the exhaust temperature is 100° C., and the exhaust time is 10 h.

[0037] (4) Put the graphite mold in step (3) into a plasma-assisted sintering device (PAS) for surface activation and sintering; wherein, the surface activation process is as follows: the loading time is 30s, the voltage is 20kV, and the current is 100A. The sintering process is as follows...

Embodiment 2

[0041] (1) Take 60 μm 7075 aluminum alloy powder and 2 μm boron carbide powder, mix 99% of 7075 powder and 1% of boron carbide powder by mass, place a light ball mill at 150 rpm and mix for 24 hours to obtain a composite powder;

[0042] (2) Put the composite powder uniformly mixed in step 1 into a stainless steel tank for ball milling, the ball mill speed is 600rpm, the mass ratio of ball to material is 40:1, the ball milling time is 8h, and the ball milling medium is liquid nitrogen.

[0043] (3) Put the nanocomposite powder in step 2 into a graphite mold and put it into a vacuum furnace to exhaust, wherein the exhaust temperature is 100° C., and the exhaust time is 10 h.

[0044] (4) Put the graphite mold in step 3 into a plasma-assisted sintering device (PAS) for surface activation and sintering; wherein, the surface activation process is as follows: the loading time is 30s, the voltage is 20kV, and the current is 100A. The sintering process is: vacuum degree ≤ 10Pa, sinte...

Embodiment 3

[0048] (1) Take 75 μm 7075 aluminum alloy powder and 2 μm boron carbide powder. By mass, 7075 powder is 92.5% mixed with boron carbide powder 7.5%, placed in a light ball mill and mixed at 150 rpm for 24 hours to obtain a composite powder;

[0049] (2) Put the composite powder uniformly mixed in step 1 into a stainless steel tank for ball milling, the ball mill speed is 600rpm, the mass ratio of ball to material is 25:1, the ball milling time is 6h, and the ball milling medium is liquid nitrogen.

[0050] (3) Put the nanocomposite powder in step 2 into a graphite mold, and put it into a vacuum furnace to exhaust, wherein the exhaust temperature is 100° C., and the exhaust time is 5 hours.

[0051] (4) Put the nanocomposite powder in step 2 into a plasma-assisted sintering device (PAS) for surface activation and sintering; wherein, the surface activation process is as follows: the loading time is 30s, the voltage is 20kV, and the current is 100A. The sintering process is as fol...

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Abstract

The invention relates to a preparation method for a boron carbide particle reinforced nanometer / ultra-fine grain aluminum based composite. According to the method, a low-temperature ball milling method is adopted for preparing nanometer compound powder and plasma activated sintering (PAS) is adopted for realizing the low-temperature compaction of the nanometer compound powder. The preparation method comprises the five steps of mixing raw materials, performing low-temperature ball milling, exhausting, performing discharging plasma activated sintering and perfoming thermal treatment, thereby obtaining the high-compactness nanometer / ultra-fine grain aluminum based composite. The nanometer / ultra-fine grain aluminum based composite prepared according to the invention has the advantages of high compactness, small grain size and excellent mechanical property; the compactness is more than or equal to 90%, the grain size of a substrate is less than 200nm, the hardness reaches up to 242.5HV and the compression yield strength reaches up to 866MPa; the boron carbide particle reinforced nanometer / ultra-fine grain aluminum based composite can be widely applied to the technical fields of aerospace, automobiles and military.

Description

technical field [0001] The invention belongs to the research field of aluminum-based composite materials, and in particular relates to the preparation of boron carbide particle-reinforced nano / ultrafine-grained aluminum-based composite materials. Background technique [0002] Since the 1990s, the development of nanotechnology has made amazing progress, which is the "new generation industrial revolution" in the field of materials. The rapid development of nanotechnology has provided a new opportunity for the research on the strengthening and toughening of composite materials. The use of nanotechnology in the production of composite materials can control the structure of composite materials and improve mechanical properties. [0003] Aluminum matrix composites have the characteristics of low density, low thermal expansion coefficient, high specific modulus, high toughness, good fatigue resistance and impact resistance, and are widely used in aerospace, automotive, electronics...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C32/00C22F1/04B22F3/105
CPCC22C1/05B22F3/105C22C1/0416C22C32/0057C22F1/04
Inventor 张联盟熊舒雅吴传栋张建罗国强沈强
Owner WUHAN UNIV OF TECH
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