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Method for preparing intermetallic aluminum-erbium or aluminum-lithium-erbium alloy by fused salt electrolysis

A technology of electrolysis of intermetallic compounds and molten salts, applied in the field of aluminum-lithium-erbium alloys and preparation of aluminum-erbium alloys, can solve the problems of large burning loss of lithium and rare earth, easy peritectic reaction, complicated preparation process, etc., and achieve production costs Low, easy to achieve experimental conditions, simple process effect

Inactive Publication Date: 2012-12-19
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The alloy prepared by this method is prone to peritectic reaction and inclusions, and the burning loss of lithium and rare earth is large at high temperature
The preparation process is complicated and the cost is high

Method used

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  • Method for preparing intermetallic aluminum-erbium or aluminum-lithium-erbium alloy by fused salt electrolysis
  • Method for preparing intermetallic aluminum-erbium or aluminum-lithium-erbium alloy by fused salt electrolysis
  • Method for preparing intermetallic aluminum-erbium or aluminum-lithium-erbium alloy by fused salt electrolysis

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Embodiment Construction

[0019] The following examples describe the present invention in more detail:

[0020] 1. KCl+LiCl+ErCl with a mass ratio of 48.9%, 48.9%, and 2.20% 3 The mixture is an electrolyte system, with metal aluminum as the cathode, a spectroscopically pure graphite rod as the anode, and Ag / AgCl as the reference electrode. The electrolysis temperature is 520°C and the electrode potential is -1.4V. After 2 hours of electrolysis, erbium is precipitated on the aluminum cathode and Diffused into the electrode to form Al-containing 3 Er's aluminum erbium alloy.

[0021] 2. KCl+LiCl+ErCl with a mass ratio of 48.9%, 48.9%, and 2.20% 3 The mixture is an electrolyte system, with metal aluminum as the cathode, a spectroscopically pure graphite rod as the anode, and Ag / AgCl as the reference electrode. The electrolysis temperature is 520°C and the electrode potential is -1.5V. After 2 hours of electrolysis, erbium is precipitated on the aluminum cathode and Diffusion into the electrode to form ...

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Abstract

The invention provides a method for preparing intermetallic aluminum-erbium or aluminum-lithium-erbium alloy by fused salt electrolysis, which is implemented in a way that: in an electrolytic furnace, metallic aluminum is use as a cathode, a graphite rod is used as an anode, and Ag / AgCl is used as a reference electrode; a mixture, which comprises 48.9 wt% of KCl, 48.9% of LiCl and 2.20% of ErCl3,is used as an electrolyte system; electrolysis is carried out at 520 DEG C; and by controlling the cathode potential at -1.4--2.1V, erbium precipitates on the solid-state aluminum cathode and diffuses to the inside of the aluminum cathode to form the aluminum-erbium alloy containing Al3Er, Al2Er and Al2Er3, or aluminum-lithium-erbium alloy containing Al-Li and Al3Er. By controlling the cathode potential, the formed strengthened phase Al3Er has high melting point and stable heat resistance, and can obviously enhance the strength of the aluminum-erbium or aluminum-lithium-erbium alloy. The invention overcomes the actual state that the composition of the aluminum-erbium or aluminum-lithium-erbium alloy prepared by the fused salt electrolysis process can not be controlled.

Description

technical field [0001] The invention relates to a method for preparing an aluminum-based alloy. Specifically, it is a method for preparing aluminum-erbium alloy and aluminum-lithium-erbium alloy. Background technique [0002] Lithium (Li) is the lightest metal element in the periodic table, with a density of 5.360g / cm 2 , every time 1% (mass ratio) of lithium is added to aluminum, the density of the alloy can be reduced by 3%, and the elastic modulus can be increased by about 6%. Adding 2% of lithium, the density can be reduced by 10%, and the elastic modulus can be increased by 25% to 35%. %, which is beyond the reach of other light metal elements. Since aluminum-lithium alloy has low density, high specific strength, high specific stiffness, excellent low temperature performance, good corrosion resistance and excellent superplastic forming performance, replacing conventional aluminum alloys with it can reduce the weight of components by 10% to 15%. %, the stiffness is in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36
Inventor 张密林孙怡韩伟孙运霞
Owner HARBIN ENG UNIV
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