Method for synthesizing aluminum-based composite material by multielement magnetic field combined fusant reaction

An aluminum-based composite material and a magnetic field technology, which is applied in the field of melt reaction synthesis of aluminum-based composite materials by using a multi-component combined magnetic field, can solve the problem that the external field cannot be used to accurately control the melt reaction synthesis process, the superposition coupling and the single coupling cannot be achieved. Complementarity and other issues to achieve the effect of shortening synthesis time, increasing rate, and reducing possibility

Active Publication Date: 2010-05-12
JIANGSU UNIV
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Problems solved by technology

The above prior art applies a form of low-frequency magnetic field to the entire process of the melt reaction. This magnetic field has little or no effect on the thermodynamics of the recombination reaction, and does not adopt different magnetic fields according to the process of the in-situ reaction, that is, different stages. effect
[0004] Chinese patent: CN 101391290A, a method for preparing metal matrix composite materials under the coupling action of magnetic field and ultrasonic field, it is proposed to apply the coupling field of magnetic field and ultrasonic field in the process of in-situ reaction, the proposed magnetic field has three schemes, including: strong pulse Magnetic field, high-frequency oscillating magnetic field and low-frequency alternating magnetic field, the three magnetic fields mentioned in this invention are three technical solutions for coupling with the ultrasonic field proposed for different preparation purposes. The disadvantages are: the electromagnetic field belongs to electromagnetic waves, and the ultrasonic field It is a mechanical wave, and the effects of the two fields can be complementary, but the two different fields cannot be superimposed and coupled, so the essence of this scheme is the coupling and complementarity of the two effects of a single magnetic field effect and an ultrasonic effect. In addition, the invention is not based on the principle The process of bit reaction means that different magnetic fields are used in different stages, and the effects of different external fields are not fully exerted.
[0005] Since the melt reaction synthesis process is a typical solid-liquid phase reaction, according to the characteristics of the solid-liquid phase reaction, the reaction mechanism, that is, the reaction composition link, can be mainly divided into three steps: 1. Dispersion of reactants and transfer to the solid-liquid interface The mass transfer process is mainly a reaction kinetics problem; second, the chemical reaction occurs on the solid-liquid interface to generate particle phase particles, which is mainly a reaction thermodynamic problem; third, the growth, diffusion and reaction of the particle phase generated by the reaction The discharge of by-products involves the thermodynamics and kinetics of the precipitation and growth of new phases in the melt, but it can mainly be regarded as a kinetic-based process. In view of the fact that the melt reaction synthesis process is at different stages, the physical chemistry involved The problems are different. Therefore, if a single external field or a composite external field is applied throughout the melt reaction synthesis process, the effect of the external field cannot be fully utilized, and the purpose of using the external field to accurately control the melt reaction synthesis process cannot be achieved.
[0006] In summary, the process control of melt reaction synthesis is the key to the preparation of particle-reinforced aluminum matrix composites by melt reaction method. The existing technology of using external fields including magnetic field, ultrasonic wave and compound field to control or improve the reaction conditions has not been based on the melt reaction method. The reaction synthesis method is an important feature of the solid-liquid phase reaction, and it is controlled by an appropriate external field according to the reaction steps and process

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  • Method for synthesizing aluminum-based composite material by multielement magnetic field combined fusant reaction
  • Method for synthesizing aluminum-based composite material by multielement magnetic field combined fusant reaction
  • Method for synthesizing aluminum-based composite material by multielement magnetic field combined fusant reaction

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Embodiment 1

[0034] Embodiment one: preparation (Al 3 Zr (s) +Al 2 o 3(s)) particle reinforced aluminum matrix composites

[0035] Raw materials: base metal: industrial pure aluminum; solid powder: industrial zirconium carbonate (Zr(CO 3 ) 2 ) powder (purity: 99.20%), refining degassing agent and slag removal agent;

[0036] In situ reaction equation: 7Al (1) +Zr(CO 3 ) 2(s) =Al 3 Zr (s) +2Al 2 o 3(s)

[0037] Particle reinforcement phase: Al 3 Zr (s) and Al 2 o 3(s)

[0038] The preparation process is as follows:

[0039] (1) First metal smelting and powder preparation:

[0040] 10Kg of industrial pure aluminum is melted in a 25kW crucible resistance furnace and heated up to 870°C for degassing and slag removal. All reagents used were fully dried at 250°C to 300°C, among which Zr(CO 3 ) 2 Grind into fine powder (particle size less than 100μm), weighed for later use, Zr(CO 3 ) 2 The added weight is 10% of the metal weight (note: the theoretical volume fraction of th...

Embodiment 2

[0054] Embodiment 2 prepares (Al 3 Zr (s) +ZrB 2(s) ) particle reinforced Al-based composites

[0055] Raw material: base metal: pure Al; reaction salt: K 2 ZrF 6 -KBF 4 (mass fraction ratio 6.2:7.8) mixed salt powder, refining degassing agent and slag removal agent;

[0056] The preparation process is as follows:

[0057] (1) First metal smelting and powder preparation:

[0058] Put 2Kg of pure Al into the crucible, melt it in a 25kW resistance furnace and raise the temperature to 900°C for degassing and slag removal. All reagents used are fully dried at 250°C to 300°C, of ​​which K 2 ZrF 6 -KBF 4 , ground into fine powder (particle size less than 200 mesh), the weight of the mixed salt added is 20% of the weight of the metal.

[0059] (2): Preparation of composite material melt under the combination of multiple magnetic fields:

[0060] If the refining is good and the temperature reaches 900°C, the K 2 ZrF 6 -KBF 4 Press into the molten aluminum in the crucibl...

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Abstract

The invention relates to a method for synthesizing an aluminum-based composite material by multielement magnetic field combined fusant reaction, which belongs to the technical field of preparation of materials. In the method, the fusant reaction synthesizing process is divided into three phases of reactant dispersion, contact chemical reaction and reaction product dispersion and by-product separation according to the characteristic that the fusant synthesizing reaction is solid-liquid phase reaction; and a corresponding combined magnetic field is applied according to different characteristics of all phases to carry out control. A high-frequency magnetic field and a low-frequency traveling wave magnetic field are applied in the reactant dispersion phase to improve the dispersing effect and the dispersing rate of a reactant; a pulse magnetic field and the low-frequency traveling wave magnetic field are applied in the contact reaction phase to accelerate the in-situ reaction course in a fusant; and the high-frequency magnetic field and the pulse magnetic field are applied in the reaction product dispersion and by-product discharge phase to control the clustering of particles and be beneficial to separating slag phases. The method can realize accurate control on the reaction synthesizing process of the fusant, improves the synthesizing efficiency and is beneficial to improving the quality of the composite material fusant.

Description

technical field [0001] The invention relates to the technical field of preparation of particle-reinforced aluminum-based composite materials, in particular to a method for synthesizing melts of aluminum-based composite materials by using multi-component combined magnetic fields. Background technique [0002] Particle-reinforced aluminum matrix composites have gradually become a new type of material that is more and more widely used because of its composite structural characteristics and good physical, chemical and mechanical properties. At present, the melt reaction synthesis method is an important method for preparing particle-reinforced aluminum matrix composites. This method is to add reactants to the melt and form a reinforced particle phase through the in-situ chemical reaction between the reactants and the aluminum matrix. Since the added reactants are basically solid phase, the reaction between the reactant and the melt is a typical solid-liquid phase reaction. The di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/115B22D1/00
Inventor 赵玉涛王宏明陈刚李桂荣
Owner JIANGSU UNIV
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