Method for preparing Mg-Li alloy by vacuum synchronous thermal reduction

An alloy and vacuum technology, applied in the field of vacuum synchronous thermal reduction to prepare Mg-Li alloy, can solve problems such as unreported, and achieve the effect of shortening the preparation process, improving the utilization rate and good technical economy

Inactive Publication Date: 2011-06-01
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, vacuum thermal reduction has been applied to the industrial production of volatile metals such as metal magnesium and lithium, but the application of vacuum thermal reduction to the production of Mg-Li alloy has not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) prepare the reaction material, the reaction material is made of MgO, Li 2 O, CaO, ferrosilicon and CaF with Si content of 75wt% 2 Composition, the mass ratio of ingredients is: MgO: Li 2 O: CaO: ferrosilicon: CaF 2 =65:5:112:50:8;

[0019] (2) pulverize the reaction material until the particle diameter is less than 0.10mm, mix evenly and briquette;

[0020] (3) Put the reaction material into a vacuum reduction tank, and reduce it for 3 hours at a vacuum degree of 1-20Pa and a temperature of 1200±50°C;

[0021] (4) Collect the alloy vapor generated by the reaction and condense it into a condensed Mg-Li alloy. Its chemical composition is Li: 5%wt, and the total amount of Mg and Li is greater than 99%wt.

Embodiment 2

[0023] (1) prepare reaction material, reaction material is by the calcined magnesium ore of MgO content 90%, Li 2 Composition of calcined lithium ore with 80% O content, CaO, ferrosilicon and fluorite with Si content of 75wt%, and the mass ratio of ingredients is: calcined magnesia ore: calcined lithium ore: calcium oxide: ferrosilicon: fluorite=30:5:100 :48:7;

[0024] (2) Pulverize the reaction material until the particle diameter is less than 0.10mm, mix evenly and briquette;

[0025] (3) After the reaction material is loaded into a vacuum reduction tank, it is reduced for 5 hours at a vacuum degree of 1-20Pa and a temperature of 1200±50°C;

[0026] (4) Collect the alloy vapor generated by the reaction and condense it into a condensed Mg-Li alloy. Its chemical composition contains Li: 10%wt, and the total amount of Mg and Li is more than 99%wt.

Embodiment 3

[0028] (1) prepare the reaction material, the reaction material is made of MgO, Li 2 Composition of O and Al, the mass ratio of ingredients is: MgO: Li 2 O:Al=42:10:70;

[0029] (2) pulverize the reaction material until the particle diameter is less than 0.10mm, mix evenly and briquette;

[0030] (3) The reaction material is packed into a vacuum reduction tank, and reduced for 5 hours at a vacuum degree of 1-20Pa and a temperature of 1100±50°C;

[0031] (4) Collect the alloy vapor generated by the reaction and condense it into a condensed Mg-Li alloy. Its chemical composition is Li: 14%wt, and the total amount of Mg and Li is greater than 99.5%wt.

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Abstract

The invention relates to a method for preparing an Mg-Li alloy by vacuum synchronous thermal reduction, belonging to the novel technical field of preparing magnesium alloy materials. The process course comprises the following steps of: preparing reactants according to stoichiometry of reduction reaction; pulverizing solid reactants and uniformly mixing; pressing the reactant powder into blocks and placing the blocks into a reduction tank, and carrying out thermal reduction reaction at the vacuum degree of 1-20Pa and the temperature of 950-1,500 DEG C; collecting alloy steam generated by reaction; and condensing the alloy steam to obtain an Mg-Li alloy in a condensed state. In the invention, the oxides of metals Mg and Li or a precursor of the oxides are utilized as raw materials, the synchronous reduction of the metals Mg and Li is realized through vacuum thermal reduction to prepare the Mg-Li alloy directly. The alloy preparation process has short route, wide sources of the raw materials, high material utilization rate, favorable economy and manufacturability, high efficiency and energy saving.

Description

technical field [0001] The invention relates to a method for preparing Mg-Li alloy by vacuum synchronous thermal reduction, which belongs to the field of new technology for preparing magnesium alloy materials. Background technique [0002] The density of magnesium is 1.74g / cm 3 , the density of lithium is 0.53g / cm 3 , there is a wonderful structural transformation relationship between metal magnesium and metal lithium. When the content of lithium element is lower than 5.7%wt, lithium is dissolved in magnesium, and the alloy is composed of α solid solution of close-packed hexagonal lattice; when the content of lithium element When the content is between 5.7%-11.5%wt, soft β phase with body-centered cubic lattice structure appears in the structure, and the alloy structure has α solid solution of close-packed hexagonal lattice and β solid solution of body-centered cubic lattice Mixed composition; when the lithium content is higher than 11.5%wt, the alloy consists of a single ...

Claims

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Application Information

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IPC IPC(8): C22C1/00C22C23/00C22B5/04C22B5/16
Inventor 彭晓东杨艳苏中华谢卫东魏群义赵辉谢苏云
Owner CHONGQING UNIV
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