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Method for preparing nano dispersion strengthened alloy

A technology of dispersion strengthening and alloying, which is applied in the field of preparation of nano-dispersion strengthening alloys. It can solve the problems that the properties of alloys are difficult to meet engineering applications, the difficulty of adding nanoparticles, and the dispersion of particles are difficult to achieve, so as to reduce the floating and sinking speed of particles and reduce the cost. , evenly distributed effect

Inactive Publication Date: 2019-11-08
BEIJING COMPO ADVANCED TECH
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  • Abstract
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Problems solved by technology

[0007] In addition to the above-mentioned problems, the alloy materials prepared by traditional methods have problems such as difficulty in adding nanoparticles, difficulty in controlling their agglomeration in the melt after addition and rapid separation from the melt, and it is difficult to obtain particles in the alloy matrix for a long time Maintaining a state of dispersed distribution, unable to ensure quantitative addition and a long enough suspension stable state to ensure the time requirements for the next step of processing, resulting in the performance of the alloy after forming is difficult to meet the needs of engineering applications

Method used

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  • Method for preparing nano dispersion strengthened alloy

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preparation example Construction

[0025] Such as figure 1 As shown, the present invention provides a preparation method of nano-dispersion strengthened alloy, comprising the following steps: heating the metal or alloy to be mixed to form a uniform liquid phase metal or alloy melt; adding nanoparticles to the In the liquid phase metal or alloy melt, each addition is accompanied by emulsification equipment for high-speed shear stirring, so that the moving acceleration of the added nanoparticles reaches G opt , until a uniformly dispersed emulsified suspension is finally formed; the suspension is subjected to subsequent processing to make a nano-dispersion strengthened alloy.

[0026] In the above steps, the size of the added nanoparticles is 1-100nm, in some embodiments, specifically 1nm, 10nm, 20nm, 30nm, 40nm, 50nm, 60nm, 70nm, 80nm, 90nm and 100nm.

[0027] In the above steps, high-speed shear emulsification and dispersion make the final acceleration of the mixed material 30-100G, specifically 30G, 40G, 50G,...

Embodiment 1

[0034] Put 3kg of pure metal copper ingot in a graphite melting furnace and heat it to 1200°C under the protection of nitrogen atmosphere; after the copper ingot is completely melted, add 3g of nano-alumina particles with a particle size of 100nm; Insert the emulsification head into the copper liquid, turn it on and gradually increase the speed to a line speed of 60m / s; after 30 minutes of high-speed shear emulsification and dispersion, add 3g of nano-alumina particles again, and high-speed shear emulsification for 30 minutes again, repeat this process, Up to a total of 30g of nano-alumina particles were added to form a suspension of nano-alumina particles-copper melt; the suspension of nano-alumina particles-copper melt was poured into a mold, and cooled by circulating water for 20 minutes to obtain nano Alumina dispersion strengthened copper castings.

[0035] The prepared nano-alumina dispersion-strengthened copper castings were tested for particle distribution and performa...

Embodiment 2

[0037] Put 2kg of Fe-Cr alloy ingot (Fe-Cr12wt%) in graphite smelting furnace and heat it to 1500°C under the protection of argon atmosphere; after the alloy ingot is completely melted, add 10g of nanometer yttrium oxide particles with a particle size of 80nm; The emulsification head of the high-speed shear emulsification disperser extends into the tin liquid, opens and gradually increases the speed to a line speed of 40m / s; after 20 minutes of high-speed shear emulsification and dispersion, the nano-yttrium oxide particles-iron-chromium alloy melt is suspended The solution was poured into the mold and cooled rapidly by circulating water for 15 minutes to obtain nano-yttrium oxide dispersion-strengthened iron-chromium alloy castings.

[0038] The obtained nano-yttrium oxide dispersion-strengthened iron-chromium alloy castings were tested for particle distribution and performance. The results showed that in the prepared nano-yttrium oxide dispersion-strengthened iron-chromium al...

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Abstract

The invention relates to a method for preparing a nano dispersion strengthened alloy. The method comprises the following steps of heating a metal or alloy to be mixed to form a liquid-phase metal or alloy melt; adding nanoparticles into a liquid-phase metal or alloy melt in batches, carrying out shearing emulsification dispersion by using equipment along with each addition, enabling the added nanoparticles to move in the melt at an acceleration Gopt, and finally forming a mixed material dispersion suspension; and carrying out subsequent processing on the mixed material dispersion suspension toprepare a nano dispersion strengthened metal or alloy. A preparation device comprises a mixing container, a heating device and an emulsifying device, wherein the emulsifying device comprises a rotorand a stator, and the peripheral side wall of the stator is provided with a gap for melt to pass through. According to the method for preparing nano dispersion strengthened alloy, the mechanical property and the high-temperature creep property of the metal or the alloy are improved, and finally the produced finished product is stable in performance, free of doping, low in cost and suitable for industrial continuous production.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a preparation method of a nano-dispersion strengthened alloy. Background technique [0002] Nano-dispersion strengthened alloy materials have excellent physical and mechanical properties, including room temperature strength and high temperature strength, wear resistance, electrical conductivity, thermal conductivity, etc. By introducing stable, uniform, nano-scale particles into the metal matrix to closely combine with the matrix, the diffusely distributed nanoparticles pin dislocations and increase the dislocation density, thereby enhancing the work hardening effect; under high temperature conditions, the strengthening particles do not dissolve and growth, it has a strong hindering effect on dislocation movement and grain boundary migration, achieves high temperature softening resistance, and makes the material have better high temperature mechanical properties. At the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/02C22C32/00C22C9/00C22C21/00C22C14/00C22C13/00
CPCC22C1/02C22C1/1036C22C9/00C22C13/00C22C14/00C22C21/00C22C26/00C22C32/0005C22C32/0015C22C32/0047C22C32/0052C22C32/0063C22C32/0068C22C32/0084C22C32/0094C22C2026/002
Inventor 张少明贺会军刘建王志刚刘希学林卓贤赵朝辉安宁张焕鹍朱学新
Owner BEIJING COMPO ADVANCED TECH
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