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 magnesi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1

[0018] (1) Prepare reaction materials, the reaction materials are MgO, Li 2 O, CaO, Si content of 75wt% ferrosilicon and CaF 2 Composition, ingredient mass ratio: MgO:Li 2 O: CaO: Ferrosilicon: CaF 2 =65:5:112:50:8;

[0019] (2) Crush the reaction material to a particle diameter of less than 0.10mm, mix evenly and compact;

[0020] (3) Put the reaction material into a vacuum reduction tank and reduce it for 3 hours at a vacuum of 1-20 Pa 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.

Example Embodiment

[0022] Example 2

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

[0024] (2) Crush the reaction materials to a particle diameter of less than 0.10mm, mix them evenly and compact them;

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

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

Example Embodiment

[0027] Example 3

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

[0029] (2) Crush the reaction material to a particle diameter of less than 0.10mm, mix evenly and compact;

[0030] (3) Put the reaction material into a vacuum reduction tank and reduce it at a vacuum of 1-20 Pa and a temperature of 1100±50°C for 5 hours;

[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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