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In-situ particle mixed reinforced aluminum-based composite material and preparation method thereof

A composite material and reinforced aluminum-based technology, which is applied in the field of composite materials with aluminum alloy as the matrix and its preparation, can solve the problems of difficult to obtain high volume fraction particles, difficult to achieve reinforcement, high volume fraction, etc., and meet the requirements of ensuring lightweight , meet the performance requirements, and improve the effect of volume fraction

Active Publication Date: 2015-09-16
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but in situ generation of TiB 2 The problem with particles is mainly that it is difficult to obtain particles with a high volume fraction, and the cost is high, etc.
[0008] Therefore, it is often difficult to achieve a high volume fraction when generating a single reinforcement in situ
Simply superimposing the two kinds of particles may not necessarily produce good results, and may even concentrate the shortcomings of the two, so that it cannot solve the existing technical problems

Method used

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  • In-situ particle mixed reinforced aluminum-based composite material and preparation method thereof
  • In-situ particle mixed reinforced aluminum-based composite material and preparation method thereof
  • In-situ particle mixed reinforced aluminum-based composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] KBF 4 with K 2 TiF 6 According to the proportion of Ti, B molar ratio about 2:1. Dry the mixed salt at 150°C for 10 hours; the mixed salt should be preheated at 280°C before the experiment. Put pure Al into the smelting furnace, add 2% mass fraction of pure Mg after melting, and then superheat the alloy melt to 800°C, the obtained alloy composition is Al-2Mg. Turn on mechanical stirring afterwards, the speed of mechanical stirring is 360r / min, add the mixed salt of pretreatment heat preservation in the melt of mechanical stirring, the total addition amount of mixed salt is 40% of alloy melt. After adding the mixed salt, keep the temperature at 800°C for 40 minutes. Get TiB 2 The volume fraction is 1%. Afterwards, the reaction salt slag was removed, and the temperature was lowered to 700°C, and the Al-25% Si master alloy and Mg were successively added to the melt for melting, and the amount of addition made the Mg 2 Si final volume fraction is 10%. Keep warm for ...

Embodiment 2

[0039] KBF 4 with K 2 TiF 6 According to the proportion of Ti, B molar ratio about 2:1. Dry the mixed salt at 175°C for 8 hours; the mixed salt is fully mixed by a mixer. The mixed salt should be preheated at 300°C before the experiment. Put pure Al into the smelting furnace, add 2% mass fraction of pure Mg after melting, and then superheat the alloy melt to 900°C, and the obtained alloy composition is Al-2Mg. Turn on mechanical stirring afterwards, the speed of mechanical stirring is 720r / min, add the mixed salt of pretreatment heat preservation in the melt of mechanical stirring, the total amount of mixed salt added is 120% of alloy melt. After adding the mixed salt, keep the temperature at 900°C for 60 minutes. Get TiB 2 The volume fraction is 10%. Afterwards, the reaction salt slag was removed, and the temperature was lowered to 750°C, and the Al-25% Si master alloy and Mg were successively added to the melt for melting, and the amount of addition made the Mg 2 Si ...

Embodiment 3

[0041] KBF 4 with K 2 TiF 6 According to the proportion of Ti, B molar ratio about 2:1. Dry the mixed salt at 160°C for 15 hours; use a ball mill to mill the mixed salt to reduce the particle size and mix evenly. The mixed salt should be preheated at 270°C before the experiment. Put pure Al into the smelting furnace, add 2% mass fraction of pure Mg after melting, and then superheat the alloy melt to 700°C, and the obtained alloy composition is Al-2Mg. Afterwards, the mechanical stirring is started, and the speed of the mechanical stirring is 800r / min. The mixed salt for pretreatment and heat preservation is added to the mechanically stirred melt, and the total amount of the mixed salt added is 80% of the alloy melt. After adding the mixed salt, keep warm at 860°C, and keep stirring at 800r / min for 30min. Get TiB 2 The volume fraction is 5%. Afterwards, the reaction salt slag was removed, and the temperature was lowered to 750°C, and the Al-25% Si master alloy and Mg wer...

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Abstract

The invention discloses an in-situ particle mixed reinforced aluminum-based composite material and a preparation method thereof. TiB2 and Mg2Si are taken as particle reinforcements, and are generated by reacting KBF4 and K2TiF6 mixed salts and adding alloy elements, respectively; the volume fractions of the two reinforcements (TiB2 and Mg2Si) in the whole composite material are 1-10% and 2-20%, respectively. The aluminum alloy matrix is an Al-Mg alloy. The preparation method comprises the following steps: pretreatment, namely drying and mixing the alloy accessories and mixed salts; melting the alloy and keeping the temperature at 700-900 DEG C; adding the mixed salts and stirring mechanically; preserving the heat of the melt and synthesizing TiB2; after finishing heat preservation, reducing the temperature to about 700-780 DEG C and removing the reaction salt residue; adding Si in the form of an Al-Si intermediate alloy and adding pure Mg, wherein the atomic ratio of Si to pure Mg is 1: 2; preserving heat at the temperature of 700-780 DEG C and stirring to synthesize Mg2Si; refining and degassing the melt and pouring. The composite material has the advantages of low density, excellent mechanical properties, large reinforcement phase volume fraction range and the like. The aluminum-based composite material with better mechanical properties can be provided while the lightweight requirement is met.

Description

technical field [0001] The invention belongs to the field of preparation and forming of aluminum-based composite materials, and relates to an in-situ generated TiB 2 and Mg 2 Si is a mixed reinforcement phase, a composite material with aluminum alloy as a matrix and a preparation method thereof. Background technique [0002] At present, with the increasingly serious environmental problems and energy crisis, the requirements for lightweight in the fields of automobiles, aerospace and other fields are becoming more and more urgent. Therefore, it is more and more important to choose suitable lightweight and high-strength materials. Relevant studies have shown that for every 10% reduction in vehicle quality, the fuel consumption will be reduced by about 5% to 6%. Due to its low density, aluminum alloy has become an ideal material for lightweight vehicles such as automobiles. At present, in the automotive industry, aluminum alloys are widely used in hubs, brake pads, car bodie...

Claims

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Application Information

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IPC IPC(8): C22C21/08C22C1/10C22C1/03C22C32/00
Inventor 吴树森高琦段学成吕书林毛有武
Owner HUAZHONG UNIV OF SCI & TECH
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