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Magnesium-strontium-rare earth interalloy and preparation method thereof

A rare earth intermediate alloy and rare earth technology, which is applied in the fields of metal materials and metallurgy, can solve the problems of complex preparation process, toxic cost, and reduce the corrosion resistance of magnesium alloys, and achieves obvious grain refinement, stable metamorphism effect, and improved ignition point. with antioxidant effect

Active Publication Date: 2011-09-14
山东山科智镁新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are currently few effective and low-cost modifiers for Si-containing magnesium alloys.
Patents 200610042395.7 and 200610066926.X give phosphorus-containing silicon-based master alloys, which can refine Mg 2 Si phase, but its preparation process is complex and reduces the corrosion resistance of magnesium alloys; patent 200710193501.6 prepared a master alloy containing strontium and antimony, which has the effect of refining the alloy structure, but the antimony contained in the master alloy is a heavy metal, which has a certain toxic and costly

Method used

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  • Magnesium-strontium-rare earth interalloy and preparation method thereof
  • Magnesium-strontium-rare earth interalloy and preparation method thereof
  • Magnesium-strontium-rare earth interalloy and preparation method thereof

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Effect test

Embodiment 1

[0033] (1) Firstly, raw materials are weighed by weight percentage: 70% of pure magnesium, 20% of pure strontium, 10% of cerium-rich mixed rare earth;

[0034] (2) Preheat the pure magnesium at 150-200°C for 20-30 minutes and dry it; then, put the pure magnesium in CO 2 with SF 6 Mixed gas (SF 6 The volume fraction is 0.5%) and put it into a resistance furnace for melting. After melting, when the melt temperature is 700° C., add pure strontium and cerium-rich mixed rare earth to the melt. The method of adding pure strontium is: Pure strontium was taken out from the anti-oxidation environment, dried and wrapped in aluminum foil, and quickly pressed into the melt below the surface of the melt with a bell jar for 5 minutes. Then, stir until the alloying elements are completely dissolved into the melt;

[0035] (3) Heat the melt to 750°C for 30 minutes, then cool it down to 730°C, skim off the scum and cast it into an ingot to obtain a Mg-20Sr-10RE master alloy.

Embodiment 2

[0037] (1) First, the raw materials are weighed by weight percentage: 40% of pure magnesium, 50% of magnesium-strontium master alloy (the weight percentage of strontium is 20%), and 10% of cerium-rich mixed rare earth;

[0038] (2) Preheat the pure magnesium at 150-200°C for 20-30 minutes and dry it; then, put the pure magnesium in CO 2 with SF 6 Mixed gas (SF 6 The volume fraction is 0.5%) and melted in a resistance furnace. After melting, when the melt temperature is 700°C, add magnesium-strontium master alloy and cerium-rich mixed rare earth to the melt, and then stir until the alloy elements are completely dissolved into the melt. melt;

[0039] (3) Heat the melt to 750°C for 30 minutes, then cool it down to 730°C, skim off the scum, cast it into an ingot, and then extrude it into a wire rod to obtain a Mg-10Sr-10RE master alloy.

Embodiment 3

[0041](1) firstly take raw material by weight percentage and be: pure magnesium 20%, magnesium strontium master alloy (the weight percentage of strontium is 20%) 40%, magnesium cerium master alloy (the weight percentage of cerium is 25%) 20%; Magnesium Neodymium master alloy (25% by weight of neodymium) 20%.

[0042] (2) Preheat the pure magnesium at 150-200°C for 20-30 minutes and dry it; then, put the pure magnesium in CO 2 with SF 6 Mixed gas (SF 6 The volume fraction is 0.5%) and melted in a resistance furnace under protection. After melting, when the melt temperature is 700°C, add magnesium-strontium master alloy and magnesium-cerium master alloy to the melt, and then stir until the alloy elements are completely dissolved into the melt. melt;

[0043] (3) Heat the melt to 750°C for 30 minutes, then cool it down to 730°C, skim off the scum, and cast it into an ingot to obtain a Mg-8Sr-5Ce-5Nd master alloy.

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Abstract

The invention relates to a magnesium-strontium-rare earth interalloy and a preparation method thereof, belonging to the fields of metal materials and metallurgy. The interalloy provided by the invention is prepared from the following components in percentage by weight: 60.0-90.0% of magnesium, 5.0-20.0% of strontium and 5.0-20.0% of rare earth, wherein the rare earth is one or more of cerium-richmixed rare earth, lanthanum-rich mixed rare earth, cerium, yttrium, lanthanum, praseodymium, samarium, europium, terbium, holmium, erbium, thulium, dysprosium and gadolinium. The preparation technique provided by the invention comprises the following steps: under the gas protection, melting a pure magnesium ingot, proportionally adding strontium (or magnesium-strontium interalloy) and rare earth (or magnesium-rare earth interalloy) into the melt, stirring while keeping the temperature until the melt composition becomes uniform, and casting into an alloy ingot or extruding into a wire or rod. The interalloy has the advantages of excellent refinement and modification effects, long effective period, simple preparation technique, high reliability, low cost and the like.

Description

technical field [0001] The invention relates to a method for refining silicon-containing magnesium alloy grain size, primary phase Mg 2 Si and / or eutectic Mg 2 The invention relates to a magnesium-strontium-rare earth master alloy of Si and a preparation method thereof, which belong to the field of metal materials and metallurgy. Background technique [0002] As the lightest metal structural material in practical application at present, magnesium alloy has many excellent properties, such as low density, high specific strength and specific stiffness, and good electromagnetic shielding and shock absorption performance. It is known as "the most potential for development in the 21st century." and promising green engineering materials”, in the face of the global energy crisis and environmental pollution, magnesium alloys present good prospects for development in many industrial fields. It is predicted that in the automotive industry, the application of magnesium will increase b...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C23/00C22C1/03
Inventor 周吉学唐守秋田长文李卫红
Owner 山东山科智镁新材料科技有限公司
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