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Method for preparing local enhancement aluminum matrix composite

An aluminum-based composite material and local reinforcement technology, applied in the field of metal-based composite material preparation, can solve the problems of low carbon content, long reaction time, complicated device, etc., and achieve the effects of good filling, rapid response and energy saving.

Inactive Publication Date: 2014-06-04
TONGREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional TiC preparation adopts the carbothermal reduction method, which is to convert Ti or TiO 2 The mixture with C is heated in a vacuum graphite tube furnace and carbonized at a high temperature above 2200°C, which has the disadvantages of complex equipment, long reaction time, high energy consumption, low carbon content and low purity of the product.

Method used

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  • Method for preparing local enhancement aluminum matrix composite

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Effect test

Embodiment 1

[0023] The method for preparing locally reinforced aluminum-based composite materials described in this embodiment uses Al powder, Ti powder, graphite powder and pure Al blocks as raw materials, and includes the following steps:

[0024] 1. Al powder, Ti powder, and graphite powder are formulated into Al-Ti-C mixed powder; in the Al-Ti-C mixed powder, the weight percent content of Al powder is 20 wt.%, Ti powder+graphite powder The weight percentage content is 80 wt.%, and the molar ratio of Ti powder and graphite powder is 1; Wherein: the purity of described Ti powder is 98%, and average particle size is 40 μ m; The purity >=99.9% of described graphite powder, average particle size It is 30 μm; the purity of the Al powder > 99%, and the average particle size is 40 μm;

[0025] 2. Ball mill the Al-Ti-C mixed powder to make it evenly mixed; then, press the evenly mixed Al-Ti-C mixed powder into a diameter of 20 mm, a thickness of 15 mm, and a relative density of 65±3% Cylindri...

Embodiment 2

[0030] The method for preparing locally reinforced aluminum-based composite materials described in this embodiment uses Al powder, Ti powder, graphite powder and pure Al blocks as raw materials, and includes the following steps:

[0031] 1. Al powder, Ti powder, and graphite powder are formulated into Al-Ti-C mixed powder; in the Al-Ti-C mixed powder, the weight percent content of Al powder is 30 wt.%, Ti powder+graphite powder The weight percentage content is 70 wt.%, and the mol ratio of Ti powder and graphite powder is 1; Wherein: the purity of described Ti powder is 98%, and average particle size is 40 μ m; The purity >=99.9% of described graphite powder, average particle size It is 30 μm; the purity of the Al powder > 99%, and the average particle size is 40 μm;

[0032] 2. Ball mill the Al-Ti-C mixed powder to make it evenly mixed; then, press the evenly mixed Al-Ti-C mixed powder into a diameter of 20 mm, a thickness of 15 mm, and a relative density of 65±3% Cylindrica...

Embodiment 3

[0037] The method for preparing locally reinforced aluminum-based composite materials described in this embodiment uses Al powder, Ti powder, graphite powder and pure Al blocks as raw materials, and includes the following steps:

[0038] 1. Al powder, Ti powder, and graphite powder are formulated into Al-Ti-C mixed powder; in the Al-Ti-C mixed powder, the weight percent content of Al powder is 40 wt.%, Ti powder+graphite powder The weight percentage content is 60 wt.%, and the mol ratio of Ti powder and graphite powder is 1; Wherein: the purity of described Ti powder is 98%, and average particle size is 40 μm; The purity >=99.9% of described graphite powder, average particle size It is 30 μm; the purity of the Al powder > 99%, and the average particle size is 40 μm;

[0039] 2. Ball mill the Al-Ti-C mixed powder to make it evenly mixed; then, press the evenly mixed Al-Ti-C mixed powder into a diameter of 20 mm, a thickness of 15 mm, and a relative density of 65±3% Cylindrical...

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Abstract

The invention relates to a method for preparing a local enhancement aluminum matrix composite and belongs to the technical field of preparing metal matrix composites. Al powder, Ti powder, graphite powder and a pure Al block are used as raw materials. The method includes the following steps that firstly, the Al powder, the Ti powder and the graphite powder are prepared to form Al-Ti-C mixed powder, and the Al-Ti-C mixed powder receives ball milling and is evenly mixed; secondly, the Al-Ti-C mixed powder is pressed to form a preformed blank which is placed into a graphite mold to be preheated to 500 DEG C; thirdly, the pure Al block is smelted to 940 DEG C through a crucible resistance furnace and then fast poured into the graphite mold, the preformed blank is ignited, a synthetic reaction happens, and the local enhancement aluminum matrix composite is obtained. The method for preparing the local enhancement aluminum matrix composite has the advantages of being fast in reaction, simple in technology, capable of saving energy, efficient, good in filling capacity, high in connection degree of a matrix and enhanced particles and the like. In addition, enhancement phase TiC particles are prevented from being contaminated by impurities such as oxygen, the method can be applied to the field of composites which only need local enhancement, and an expensive enhancement phase is omitted.

Description

technical field [0001] The invention relates to a method for preparing locally reinforced aluminum-based composite materials, and belongs to the technical field of metal-based composite materials preparation. Background technique [0002] At present, aluminum matrix composites are widely used in technical fields such as aerospace, automobile transportation and electronic components, and their reinforcing phases are mainly SiC, TiC, Al 2 o 3 Integral reinforcement particles mainly composed of ceramic particles. On the one hand, these overall reinforcement particles react violently in the cavity and are difficult to control; on the other hand, although these overall reinforcement particles are beneficial to improve the overall wear resistance of composite wear-resistant parts, they reduce the overall toughness of composite wear-resistant parts. , Moreover, reinforcement particles appear in parts that do not require reinforcement, which leads to waste of reinforcement phase, ...

Claims

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Application Information

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IPC IPC(8): B22D19/14
Inventor 宋谋胜冷森林张杰田昌海龙禹
Owner TONGREN UNIV
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