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Mixed salt method for preparing aluminum matrix composite material

An aluminum-based composite material and mixed salt technology, applied in the field of composite materials, can solve the problems of low mass fraction of composite materials, enhanced particle segregation and sedimentation, etc., and achieve the effects of increasing viscosity, reducing surface energy, and reducing moving speed.

Inactive Publication Date: 2008-12-17
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a mixed salt method for preparing aluminum-based composite materials, to solve the problem that the mass fraction of composite materials prepared by existing methods is not high and the reinforcement particle TiB 2 Segregation settling problem during preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] The mixed salt method of preparing aluminum-based composite material of the present invention is specifically as follows:

[0016] Melt the base material in the temperature range of 720-800°C, keep warm and homogenize for 30 minutes (min), and then add the reaction salt and reaction aid after fully overheating (wherein, the reaction salt and reaction aid must be mixed evenly and dried), react During the process, a flat-plate blade is used for stirring, and the blade rotation speed range is controlled at 200-1000 rpm. The reaction time after adding the reaction salt and reaction additive is 10-30 minutes. After the reaction is completed, the salt residue is removed and refined. Processed cast material.

[0017] The above reaction auxiliary agent adopts potassium chloride KCl, sodium chloride NaCl, magnesium chloride MgCl 2 and hexafluoroaluminum trisodium Na 3 AlF 6 A mixed salt of which, potassium chloride KCl, sodium chloride NaCl and magnesium chloride MgCl 2 The ...

Embodiment 1

[0023] With pure aluminum as the base material, potassium tetrafluoroborate KBF 4 Potassium hexafluorotitanate K 2 TiF 6 As a reaction mixed salt, the reaction aid uses KCl, NaCl, MgCl 2 and Na 3 AlF 6 , where KCl: NaCl: MgCl 2 =1:1:0.5, Na 3 AlF 6 The amount is 10% of the total amount of chloride.

[0024] Melt the base material at 760°C, keep warm and homogenize for 30 minutes at the same time, add the mixed and dried reaction salt and reaction aid after fully overheating, the reaction time is 10 minutes, when adding the reaction salt and reaction aid, also add the matrix The weight of the material is 1% metal magnesium; among them, the reaction salt and the reaction aid are added in batches for multiple times, and the next batch is added after the salt residue is removed after each reaction; the flat blade is used to stir during the reaction, and the stirring speed 600 rpm; after the reaction is completed, use carbon hexachloride C 2 Cl 6 Refined, C 2 Cl 6 The a...

Embodiment 2

[0026] The aluminum alloy of model A356 is used as the base material, KBF 4 and K 2 TiF 6 As a reaction mixed salt, the reaction aid contains KCl, NaCl, MgCl 2 and Na 3 AlF 6 , where KCl: NaCl: MgCl 2 =1:1:1, Na 3 AlF 6 The amount is 20% of the total weight of chlorides.

[0027] Melt the matrix alloy at a temperature of 720°C, and keep it homogenized for 30 minutes at the same time. After fully overheating, add the mixture of reaction salt and reaction additive in batches for several times. During the reaction, a flat blade is used at a speed of 200 rpm Stir to promote its full reaction, and the reaction time is 20min; wherein, when the reaction salt and the reaction auxiliary agent are added, metal magnesium that accounts for 1.5% of the weight of the matrix alloy material is also added; after the reaction is completed, use C 2 Cl 6 Refining, the amount is controlled to be 1% of the mass of the matrix alloy material, the refining time is 10 minutes, and it is left t...

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Abstract

The invention relates to a mixed salt method for preparing an aluminum matrix composite. A matrix material is melted at a temperature ranging from 720 to 800 DEG C, kept at a constant temperature so as to cause the matrix material to be even; after being fully and excessively heated, a matrix material solution is added with a reaction salt and a reaction promoter that are evenly mixed and dried for a plurality of times, stirred by adopting a flat vane simultaneously for promoting the full reaction of the solution; when the reaction salt and the reaction promoter are added, magnesium metal is also added which further prevents reinforcing particles produced from clustering and deposing; the stirring speed of the vane is controlled to be 200 to 1000 circles per minute; after the reaction salt and the reaction promoter are added, the time of reaction is 10 to 30 minutes; finally, refining and casting are carried out to the composite, and the aluminum matrix composite is obtained with a TiB2 particle content reaching as high as 10 percent and good structural performance. The method utilizes the processes of melting alloy elements and fast stirring, solves the problems of the clustering and deposing of produced TiB2 reinforcing particles and can prepare the aluminum matrix composite with high performance.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a method for preparing aluminum-based composite materials. Background technique [0002] At present, the in-situ self-generated reaction particle reinforced aluminum matrix composite method is to add reactive salt to the aluminum melt to synthesize the reinforced particles in situ inside the matrix, and the resulting aluminum matrix composite matrix interface is well bonded and clean. The size of in-situ reinforced particles is small (generally <3.0 μm) and evenly distributed in the matrix. By selecting the reaction type and controlling the reaction parameters, different types and different quantities of in-situ reinforced particles can be obtained; the in-situ synthesis of reinforced particles is the same as casting technology Combined, they can be used to prepare composite materials of a certain shape and size, with simple process and low cost. After literature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C21/00
Inventor 王哲张迎元王浩伟牛建民
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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