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Ceramic particle reinforced aluminium-based composite material and powder metallurgical process to prepare the material

A technology of powder metallurgy and ceramic particles, which is applied in the field of aluminum-based composite materials and its preparation, powder metallurgy self-generated ceramic particle-reinforced aluminum-based composite materials and its preparation, and can solve the problem of high brittleness, lack of metal toughness and plasticity, and affecting performance And other issues

Inactive Publication Date: 2004-04-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Particle-reinforced aluminum matrix composites have the characteristics of high specific strength, high specific modulus, low density, and good heat resistance. The reinforcing phase in composite materials is mostly external ceramic particles such as Al 2 o 3 , SiC, Si 3 N 4 , TiC, B 4 C. TiB 2 , AlN, etc., but unfortunately the density of these reinforcements is greater than that of aluminum, which is not conducive to giving full play to the characteristics of light weight, high specific strength and high specific stiffness of aluminum matrix composites
In addition, there are also the following disadvantages in the preparation process: (1). Due to the non-wetting of the ceramic particles and the base metal, it is difficult to prepare a metal matrix composite material with uniform distribution of ceramic particles; (2). The interface between the ceramic particles and the metal Poor combination affects its final performance; (3). The interface adverse reaction between ceramic particles and metal melt affects its final performance
This material is actually a ceramic material or a ceramic matrix composite material, which does not have the toughness and plasticity of metals. Although it can reach a hardness above 40GPa, which is conducive to wear resistance, it is too brittle and poor in toughness, so it cannot be used as a A lightweight, high-strength composite material with a certain degree of toughness and plasticity

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] Raw material powder composition (percentage by weight): Al: 95.9%, Mg: 1%, B: 3%, Fe: 0.1%, after mixing the above raw material powders evenly, cold press molding, molding pressure 250Mpa, the cold press molding The semi-finished product is placed in a heating furnace with a protective atmosphere, firstly heat-pressed at 480°C, the pressing pressure is 1GPa, then heated to 950°C, kept for 2 hours, and cooled to room temperature with the furnace to prepare self-generated AlMgB 14 The ceramic phase particle reinforced aluminum matrix composite material has an elastic modulus of 91GPa and a tensile strength of 180Mpa.

Embodiment 2

[0017] Raw material powder composition (weight percentage): Al: 50%, Mg: 7%, B: 30%, Si: 13%. The semi-finished product is placed in a heating furnace with a protective atmosphere. First, it is hot-pressed at 530°C with a pressing pressure of 1.6GPa, then heated to 1250°C, kept for 4 hours, and cooled to room temperature with the furnace to prepare self-generated AlMgB 14 The ceramic phase particle reinforced aluminum matrix composite material has an elastic modulus of 245GPa and a tensile strength of 650Mpa.

Embodiment 3

[0019] Raw material powder composition (weight percent): Al: 73.5%, Mg: 4%, B: 16%, Cu: 4.5%, Ni: 1%, Cr: 1%. After mixing the above raw material powders evenly, cold press molding, The molding pressure is 500Mpa. Put the cold-pressed semi-finished product in a heating furnace with a protective atmosphere. First, it is hot-pressed at 505°C, and the pressing pressure is 1.3GPa. Then it is heated to 1100°C, kept for 3 hours, and cooled with the furnace to At room temperature, the prepared self-generated AlMgB 14 The ceramic phase particle reinforced aluminum matrix composite material has an elastic modulus of 140GPa and a tensile strength of 640Mpa.

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Abstract

The present invention belongs to the field of composite material preparation technology. The composite material has the chemical expression of: AlaMgbBcMd, Where a is 50-96, b 1-7, c3-30 and d 0-13; M is one or several of Si, Cu, Ni, Ti, Fe, Cr, La, Mn, Ce, Zn, V and Zr. The preparation process is one combined powder metallurgy and in-situ reaction process and includes mixing material powder, cold pressing the mixture for forming, heating the formed mixture and hot pressing for the material powder to produce chemical reaction at temperature over 950 deg.c. Inside the aluminum alloy base, A1MgB14 ceramic phase particle as reinforcing phase is formed to prepare the composite aluminum alloy material. The ceramic particle reinforced composite aluminum alloy material. The ceramic particle reinforced composite aluminum alloy material has light weight and high strength, integrated functions, and may be used widely in transport industry and national defence industry.

Description

technical field [0001] The invention relates to an aluminum-based composite material and a preparation method thereof, in particular to a powder metallurgy self-generated ceramic particle-reinforced aluminum-based composite material and a preparation method thereof, belonging to the field of composite materials. Background technique [0002] Particle-reinforced aluminum matrix composites have the characteristics of high specific strength, high specific modulus, low density, and good heat resistance. The reinforcing phase in composite materials is mostly external ceramic particles such as Al 2 o 3 , SiC, Si 3 N 4 , TiC, B 4 C. TiB 2 , AlN, etc., but unfortunately the density of these reinforcements is higher than that of aluminum, which is not conducive to giving full play to the characteristics of light weight, high specific strength and high specific stiffness of aluminum matrix composites. In addition, there are also the following disadvantages in the preparation proc...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C21/00
Inventor 范同祥张荻杨光
Owner SHANGHAI JIAO TONG UNIV
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