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Composite grain finer for Mg-Al alloy and preparation method thereof

A compound refiner and grain technology, applied in the field of grain compound refiner and its preparation, can solve the problems of difficult to accurately control the composition of the refiner, limited refinement effect, easy oxidation, etc., and achieve a significant refinement effect , the composition is easy to control, and the preparation method is simple

Inactive Publication Date: 2010-07-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above three published patents, the preparation process includes the steps of mixing, drying, pressing and sintering of aluminum powder, graphite powder and magnesium powder. The main problem is that the aluminum powder and magnesium powder are easy to oxidize during the preparation process. , it is difficult to accurately control the composition of refiner
And publication number is the Chinese patent of CN1410566 and publication number is that the patent application of CN1583327 all only utilizes the thinning effect of carbon powder, compared with composite thinning, its thinning effect is relatively limited

Method used

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  • Composite grain finer for Mg-Al alloy and preparation method thereof
  • Composite grain finer for Mg-Al alloy and preparation method thereof
  • Composite grain finer for Mg-Al alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Example 1 Preparation of Al-Mg-Ca-C Grain Composite Refiner

[0059] In this example, pure Al, pure Mg, Mg-30% Ca master alloy and graphite powder were used as raw materials to prepare an Al-Mg-Ca-C grain refiner. The preparation method of the Mg-30% Ca master alloy is as follows: put pure magnesium and pure Ca into a low-carbon steel crucible with a mass ratio of 7:3, then put it into a vacuum furnace, vacuumize and heat to 750°C, and melt Finally, the crucible is taken out, stirred properly, and cast into a mold to obtain the Mg-30%Ca master alloy.

[0060] The preparation method of Al-Mg-Ca-C grain compound refiner is as follows: melt 55g of pure Al at 750°C, add 27g of Mg according to the formula (Ca8.1%, Al 55%, 3% C, and the rest is Mg) -30% Ca master alloy and 15g pure Mg to obtain an Al-Mg-Ca master alloy melt; the Al-Mg-Ca master alloy melt is cooled to 630°C and stirred at a stirring speed of 400r / min, While stirring, use a long-mouthed funnel to slowly add ...

Embodiment 2

[0061] Example 2 Preparation of Al-Mg-Ca-C Grain Composite Refiner

[0062] In this example, pure Al, pure Mg, Mg-30% Ca master alloy and graphite powder were used as raw materials to prepare an Al-Mg-Ca-C grain refiner. Its preparation method is: melt 50g of pure Al at 700°C, stir evenly, add 17g of Mg-30% Ca and 32g of pure Mg according to the formula (Ca 5%, Al 50%, C 1%, the rest is Mg), and obtain Al-Mg-Ca master alloy melt; cool the Al-Mg-Ca master alloy melt to 600°C, and stir it at a stirring speed of 200r / min, while stirring, use a long-mouthed funnel to the center of the stirring vortex Slowly add graphite powder with a particle size of 8-15 μm in an amount of 1 g, and stir for 3 minutes to obtain a semi-solid melt. Cast the semi-solid melt to obtain the grain compound refiner Al-Mg-Ca-C of the present invention.

Embodiment 3

[0063] Example 3 Preparation of Al-Mg-Ca-C Grain Composite Refiner

[0064] In this example, pure Al, Mg-30% Ca master alloy and graphite powder were used as raw materials to prepare an Al-Mg-Ca-C grain refiner. Its preparation method is: melt 60g of pure Al at 800°C, stir evenly, add 35g of Mg-30%Ca according to the formula (10.5% Ca, 60% of Al, 5% of C, and the rest is Mg) to obtain Al-Mg-Ca Master alloy melt: Cool the Al-Mg-Ca master alloy melt to 650°C and stir it at a stirring speed of 500r / min. While stirring, slowly add a particle size of 8 to the center of the stirring vortex using a long-mouthed funnel. ~ 15 μm graphite powder, added in an amount of 5 g, and then stirred for 3 minutes to obtain a semi-solid melt. Cast the semi-solid melt to obtain the grain compound refiner Al-Mg-Ca-C of the present invention.

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Abstract

The invention discloses a composite grain finer for Mg-Al alloy and a preparation method thereof. The composite finer comprises the following components: 50-60 percent of Al, 1-5 percent of C, 5-10.5 percent of Ca or 5-10.5 percent of Sr, and the balance of Mg. The preparation method comprises the following steps of: melting pure Al under 700-800 DEG C, adding Mg-CA or Mg-Sr intermediate alloy according to the formula, and compensating the insufficient Mg with pure Mg to obtain Al-Mg-Ca or Al-Mg-Sr intermediate alloy melt, cooling the melt to 600-650 DEG C, uniformly dispersing graphite powder into the melt by using a semi-solid stirring method, and casting to obtain the composite grain finer. The finer has the advantages of simple preparation method, easy batch production, easy control of the addition amount, no discharge of pollutant and particularly remarkable fining effect for the Mg-Al alloy with low Al content.

Description

technical field [0001] The present invention relates to a grain composite refiner for Mg-Al alloy and a preparation method thereof, in particular to a high-efficiency composite refiner containing graphite and alkaline earth metal (Ca or Sr) for Mg-Al alloy and its preparation method Preparation. Background technique [0002] Magnesium alloy is the lightest metal structure material. It has the advantages of light specific gravity, high specific strength, good vibration damping, strong electromagnetic shielding, and easy recycling. It is considered to be the most potential development and application in the 21st century. "Material. However, compared with iron and steel materials, the mechanical properties of magnesium alloy materials are still low, and further improving its strength, plasticity and toughness is very important for the promotion and application of magnesium alloys. It is well known that grain refinement is an important way to improve the strength and toughness...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/20C22C1/06C22C23/02
Inventor 杜军李文芳
Owner SOUTH CHINA UNIV OF TECH
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