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Preparation method for reinforced aluminum base composite material composed by in situ alpha-Al2O3 crystal whisker and TiC grain

An aluminum-based composite material and particle compounding technology, which is applied in the field of preparation of in-situ α-Al2O3 whiskers and TiC particle composite reinforced aluminum-based composite materials, can solve the problems of backward development speed, high cost, complicated process technology, etc., and achieve The effect of low cost, small size and simple process

Inactive Publication Date: 2004-12-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex technology and high cost of metal matrix composite materials, the development speed has been lagging behind that of resin matrix composite materials.

Method used

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  • Preparation method for reinforced aluminum base composite material composed by in situ alpha-Al2O3 crystal whisker and TiC grain
  • Preparation method for reinforced aluminum base composite material composed by in situ alpha-Al2O3 crystal whisker and TiC grain
  • Preparation method for reinforced aluminum base composite material composed by in situ alpha-Al2O3 crystal whisker and TiC grain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of 0.3% α-Al 2 o 3 Whiskers (calculated. % by weight) and 3% by weight TiC / technically pure aluminum composite. Weigh Al powder, Ti powder and C powder with purity of 98%, 99.8% and 99.5% and particle size of 75 μm, 45 μm and 10 μm according to the ratio of Al:Ti:C=2:70:28, and mix them evenly . A cylindrical prefabricated block of Φ20×30mm is pressed on a 50-ton press. Put 2 kg of industrial pure aluminum into an intermediate frequency induction furnace to melt and heat to 850°C. Press 0.06 kg of prefabricated blocks into molten aluminum with a graphite bell jar and keep warm for 10 minutes. When the temperature drops to 750° C., add 0.4 wt % hexachloroethane for refining. When the melt temperature is 720°C, it is poured into a metal mold to obtain 0.3 wt% α-Al 2 o 3 Whiskers and 3 wt% TiC / commercially pure aluminum composites. Composite material σ b is 147MPa, and δ is 14%.

Embodiment 2

[0044] Preparation of 0.45% α-Al 2 o 3 Whiskers (calculated. % by weight) and 5% by weight TiC / Al-21Si-2.5Cu composite. By Al:TiO 2 : C = 1: 2.22: 0.33 ratio to take appropriate amounts of Al powder, TiO with a purity of 98%, 99.8% and 99.5% and a particle size of 75 μm, 75 μm and 10 μm respectively 2 powder and C powder, mix them well. A cylindrical prefabricated block of Φ20×30mm is pressed on a 50-ton press. Put 4 kg of Al-21Si-2.5Cu alloy into a medium-frequency induction furnace to melt and heat to 950 °C. Press a 0.20 kg prefabricated block into molten aluminum with a graphite bell jar and keep it warm for 15 minutes. Refining is added by adding 0.3% by weight of hexachloroethane to the melt. When the temperature drops to 740°C, add 0.4% hexachloroethane to the weight of the melt for refining. When the melt temperature is 730°C, it is poured into a metal mold to obtain 0.45 wt% α-Al 2 o 3 Whiskers and 5 wt% TiC / Al-21Si-2.5Cu composites. Composite material σ b ...

Embodiment 3

[0046] Preparation of 0.5% α-Al 2 o 3 Whiskers (calculated. wt%) and 5 wt% TiC / 7075 composite. By Al:TiO 2 : Ti: C=1: 2.6: 0.44: 0.44 The ratio of weighing appropriate amount of purity is respectively 98%, 99.8% and 99.5%, the particle size is respectively 75 μm, 75 μm, 45 μm and 10 μm of Al powder, TiO 2 Powder, Ti powder and C powder, mix them evenly. A cylindrical prefabricated block of Φ20×30mm is pressed on a 50-ton press. Put 4 kg of 7075 alloy into an intermediate frequency induction furnace to melt and heat to 900°C. Press a 0.20 kg prefabricated block into molten aluminum with a graphite bell jar and keep it warm for 10 minutes. Refining by adding 0.3% hexachloroethane by weight of the melt. When the melt temperature is 730°C, it is poured into a metal mold to obtain 0.5 wt% α-Al 2 o 3 Whiskers and 5 wt% TiC / 7075 composite. Composite material σ after extrusion b It is 675MPa.

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Abstract

The preparation process of in-situ alpha-Al2O3 whisker and TiC grain composite reinforcing aluminum-base material features that the technological process includes two stages of preparing prefabricated block and smelting aluminum-base composite material. Three kinds of reactant may be selected, including the first kind of Al+Ti+C+O2, the second kind of Al+ C+O2+TiO2, and the third kind of Al+Ti+C+TiO2. The raw materials in the stoichiometric proportion are mixed homogeneously, pressed to form in the pressure of 25-100 MPa and smelted into the composite material. The present invention has the advantages of simultaneous alloy smelting and reinforced phase formation, shortened composite material preparing process and lowered production cost, and the composite material may be used widely in various fields.

Description

technical field [0001] The invention belongs to the field of metal matrix composite materials, and in particular provides an in-situ α-Al 2 o 3 The preparation method of whisker and TiC particle composite strengthened aluminum matrix composite material can make the smelting of matrix alloy and the generation of reinforcing phase proceed simultaneously, significantly shorten the process flow of composite material preparation, reduce the manufacturing cost of metal matrix composite material, and can be widely used in Where lightweight and high-strength composite materials are required. Background technique [0002] With the development of modern science and technology, the requirements for materials are increasing day by day. It is hoped that materials have certain special properties and excellent comprehensive properties at the same time, which makes it more and more difficult for ordinary single materials to meet the needs. Composite materials have the characteristics of b...

Claims

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Application Information

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IPC IPC(8): C22C29/00C22C47/00C22C49/06
Inventor 杨滨王玉庆张济山
Owner UNIV OF SCI & TECH BEIJING
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