Method for synthetizing particle reinforced metal matrix composite material in pulsed electric field

A pulsed electric field and composite material technology is applied in the field of preparation of particle-reinforced metal matrix composite materials to achieve the effects of low production cost, guaranteed material properties, and promotion of particle nucleation

Inactive Publication Date: 2011-07-13
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a new method for synthesizing particle-reinforced metal matrix composites under the action of a pulsed electric field to solve the problem of preparing particle-reinforced composites by the current melt reaction synthesis method. The reaction speed and efficiency of metal matrix composites are difficult to improve, and the generated particles are easy to agglomerate and grow, so as to realize the industrial-scale preparation and application of high-performance particle-reinforced metal matrix composites

Method used

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  • Method for synthetizing particle reinforced metal matrix composite material in pulsed electric field
  • Method for synthetizing particle reinforced metal matrix composite material in pulsed electric field
  • Method for synthetizing particle reinforced metal matrix composite material in pulsed electric field

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Raw materials: base metal: aluminum alloy; solid powder: industrial zirconium carbonate (Zr(CO 3 ) 2 ) powder (purity 99.20%), refining degassing agent and slag removal agent;

[0030] In situ reaction equation: 7Al (l) +Zr(CO 3 ) 2(s) =Al 3 Zr (s) +2Al 2 o 3(s) ;

[0031] Particle reinforcement phase: Al 3 Zr (s) and Al 2 o 3(s) ;

[0032] The preparation process is as follows:

[0033] (1) First metal smelting and powder preparation:

[0034] Aluminum alloy 50Kg was melted in a 25kW crucible resistance furnace and heated up to 900°C, degassed and slag removed; all reagents used were fully dried at 300°C, of ​​which Zr(CO 3 ) 2 Grind into fine powder (particle size less than 100 mu m), ready to use after weighing, Zr(CO 3 ) 2 The added weight is 20% of the metal weight (note: the theoretical volume fraction of the particle phase is about 28 vol%).

[0035](2): Melt reaction synthesis under pulsed electric field to prepare composite material melt:...

Embodiment 2

[0043] Raw material: matrix magnesium alloy (Mg-11%Al-0.5%Zn-0.2%Mn); reaction salt: K 2 TiF 6 -KBF 4 Powder, refining degassing agent and slag removal agent;

[0044] The preparation process is as follows:

[0045] (1): Metal smelting and powder preparation:

[0046] Mixed salt reagents are fully dried at 250°C to 300°C, of ​​which K 2 TiF 6 -KBF 4 , ground into fine powder (particle size less than 100 mesh), weighed according to 10% of the theoretical weight of the particle-reinforced phase, and then wrapped with aluminum foil for use.

[0047] 2Kg of pure magnesium alloy is melted to 750°C in another crucible melting furnace filled with argon, and at the same time, 0.15% calcium is added to the melt to prevent flames, and NaCl, KCl and MgCl are used to 2 Mix flux.

[0048] (2): In situ reaction synthesis and preparation under pulsed electric field

[0049] After the temperature of the magnesium alloy melt is qualified, the K 2 ZrF 6 -KBF 4 Press into the magnesi...

Embodiment 3

[0052] Raw materials: base metal: 7055 aluminum alloy; reaction salt: K 2 ZrF 6 -KBF 4 (Mass ratio 6.2:7.8) Mixed salt powder, refining degassing agent and slag removal agent;

[0053] The preparation process is as follows:

[0054] (1) First metal smelting and powder preparation:

[0055] 100Kg 7055 aluminum alloy is melted in a crucible-type induction furnace and heated to 900°C, degassed, slag removed, and ready for use; all reagents used are fully dried at 250°C-300°C, of ​​which K 2 ZrF 6 -KBF 4 , to be ground into fine powder (particle size less than 200 mesh), the added weight is 20% of the metal weight.

[0056] (2): Melt reaction synthesis under pulsed electric field to prepare composite material melt:

[0057] After the melt temperature is qualified, a refining is carried out, and the melt that has been refined and meets the temperature requirement (900°C) is poured into the melt reaction synthesizer 1 with heat preservation function, and the solid reactant is...

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Abstract

The invention provides a new method for synthetizing a particle reinforced metal matrix composite material in a pulsed electric field, belonging to the technical field of material preparation. The main process of the method is characterized in that the pulsed electric field is applied to a fusant in a synthetic process of the particle reinforced composite material by the traditional fusant directreaction method; and the pulsed current peak value density is 1-10A / cm<2>, the pulse frequency is 0.1-10Hz, and the time of processing the fusant in the pulsed electric field is 2-10minutes. The comprehensive effect of the electric potential oscillation fluctuation, transient force effect and heat effect in the pulsed electric field are utilized by the method provided by the invention, so as to promote the ionic migration and particle nucleation in in-situ reaction, inhibit the growth of the particles and improve the dispersibility of the particles, thus by adopting the method provided by theinvention, the reaction rate and the yield can be improved, the obvious effects of particle shape control and dispersion promotion are achieved, and the method is suitable for preparing high-performance particle reinforced composite material in an industrial scale.

Description

technical field [0001] The invention relates to the technical field of preparation of particle-reinforced metal-matrix composite materials, in particular to a new method for preparing particle-reinforced metal-matrix composite materials through direct reaction synthesis of melts under the action of a pulsed electric field. Background technique [0002] Particle-reinforced metal matrix composites have gradually become a new type of material that is more and more widely used due to their composite structural characteristics and good physical, chemical and mechanical properties. There are mainly two mature methods for the preparation of particle-reinforced metal matrix composites: Plus enhanced particle method and in situ reaction generation method. [0003] For the method of adding reinforced particles, after searching the existing technology, it is found that the Chinese patent: CN 1510153, the publication date is: 2004.07.07, the name of the invention is: high-strength and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C32/00
Inventor 王宏明李桂荣赵玉涛张勋寅张廷旺
Owner JIANGSU UNIV
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