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Rare-earth magnesium alloy preparation method

A rare earth magnesium and alloy technology, applied in metal processing equipment, manufacturing tools, casting molding equipment, etc., can solve problems such as difficult to control impurities, intermediate alloys affecting alloy quality, etc., achieve simple preparation method, reasonable equipment structure, excellent comprehensive The effect of mechanical properties

Active Publication Date: 2015-10-14
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, magnesium alloys are very prone to oxidation, and it is difficult to control the generation of impurities during the smelting process, and the addition sequence of the master alloy also affects the quality of the alloy

Method used

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Embodiment 1

[0023] Embodiment 1: the preparation of heat-resistant rare earth magnesium alloy:

[0024] Experimental raw materials: pure magnesium ingot: purity ≥99.95%, pure zinc ingot: purity ≥99.99%, master alloys are Mg-30%Y, Mg-30%Sm, Mg-30%Zr, impurity content ≤0.1wt%.

[0025] Rare earth alloy composition (weight percentage): rare earth element Y: 2.8%, rare earth element Sm: 2.8%, Zn: 1.8%, Zr: 0.6%, the rest is Mg, and the weight percentage sum of rare earth alloy composition is 100%.

[0026] The smelting process of the rare earth magnesium alloy of the present embodiment is:

[0027] Rare earth magnesium alloys are formulated according to the above ingredients, and the rare earth magnesium alloys are preheated before smelting. Preheat to 180°C and keep warm for 30 minutes.

[0028] The above-mentioned well-type resistance melting furnace is used for smelting. After the temperature of the furnace rises to 740°C-750°C, CO 2 and SF 6 The mixed protective atmosphere, through th...

Embodiment 2

[0030] Embodiment 2: Preparation of flame retardant rare earth magnesium alloy

[0031] Experimental raw materials: pure magnesium (Mg>99.95wt%), Mg-Y master alloy (rare earth element Y>30wt%), master alloy Mg-Ca (Ca>15wt%), master alloy Mg-Zr (Zr>30wt%) .

[0032] Rare earth magnesium alloy composition (weight percentage): rare earth element Y: 3.5%, CaO: 9%, Zr: 0.6%, the rest is Mg, and the weight percentage sum of the rare earth alloy composition is 100%.

[0033] The smelting process of the rare earth magnesium alloy of the present embodiment is:

[0034] Alloys are formulated according to the above ingredients, rare earth magnesium alloys are preheated before smelting, pure magnesium, intermediate alloys Mg-Y, Mg-Ca, and Mg-Zr are preheated to 180°C to 220°C in an incubator, and Keep warm at high temperature for 30min. The above-mentioned well-type resistance melting furnace is used for smelting. 2 and SF 6 The mixed protective atmosphere fully discharges the air in...

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Abstract

The invention discloses a rare-earth magnesium alloy preparation method. A pit-type resistance melting furnace and cooling speed-controlled pig casting equipment are adopted for melting under the protection of a CO2+SF6 mixed gas. The rare-earth magnesium alloy preparation method particularly comprises the following steps: heating the furnace up to 740-750 DEG C; adding pure magnesium preheated to 200 DEG C; injecting into the CO2+SF6 mixed gas; after the pure magnesium is completely molten, sequentially adding other alloys and an intermediate alloy; after complete melting, heating up to 760-780 DEG C; turning off the CO2+SF6 mixed gas; injecting into Ar gas; adding a refining agent for 6-10 min refining; after that, leaving to stand for 25-30 min; and when the temperature is lowered to 720-740 DEG C, casting in the cooling speed-controlled pig casting equipment to obtain the as-cast rare-earth magnesium alloy. The rare-earth magnesium alloy preparation method strictly controls oxidation in the alloy melting process, guarantees the alloy quality, reduces heat loss in the alloy melting process and ensures the alloy casting quality.

Description

technical field [0001] The invention belongs to the field of material preparation, and relates to the preparation of alloy materials, in particular to a preparation method of rare earth magnesium alloy. Background technique [0002] As the lightest engineering structural material, magnesium alloy has the advantages of small specific gravity, high specific strength and specific stiffness, good vibration damping and easy recycling. It is known as the green engineering metal structural material in the 21st century. However, magnesium alloys are very prone to oxidation, and it is difficult to control the generation of impurities during the smelting process. The addition sequence of the master alloy also affects the quality of the alloy. Therefore, laying the technical foundation and equipment foundation for the development and application of new magnesium alloys and developing a suitable magnesium alloy preparation method have always been one of the research topics of the applic...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C23/06B22C9/20
Inventor 王文礼张薇雷宁宁
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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