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Method for preparing magnesium-gadolinium-yttrocalcite ternary intermediate alloy

A binary master alloy and master alloy technology, applied in the field of metallurgical technology preparation, can solve the problems of sedimentation and composition segregation, difficult control of alloy composition, small diffusion coefficient, etc., reduce oxidation and burning loss, promote homogenization, The effect of accelerating diffusion

Active Publication Date: 2009-12-02
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high density of the intermediate alloy, it sinks to the bottom of the melt and melts during smelting. At the same time, due to the high density of rare earth elements, the diffusion coefficient in the magnesium alloy melt is small, and the melted rare earth elements remain at the bottom of the melt, resulting in alloy The composition is difficult to control and the yield of raw materials is low, which is prone to sedimentation and composition segregation, seriously reducing work efficiency and increasing production costs

Method used

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  • Method for preparing magnesium-gadolinium-yttrocalcite ternary intermediate alloy
  • Method for preparing magnesium-gadolinium-yttrocalcite ternary intermediate alloy
  • Method for preparing magnesium-gadolinium-yttrocalcite ternary intermediate alloy

Examples

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Embodiment 1

[0025] A method for smelting 46 kg of Mg-Gd-Y ternary master alloy, wherein the alloy composition (percentage by weight) is 11.83% Gd, 6.48% Y, and the rest is Mg.

[0026] Step 1, get its raw material to be the Mg-10wt.%Y binary master alloy ingot of 37.52kg and the Mg-60wt.%Gd binary master alloy ingot of 10.34kg; Clean up two kinds of binary master alloy surfaces, and pre- Heat to 150°C;

[0027] Step 2: Turn on the melting furnace, which adopts resistance melting furnace equipment, and add 37.52kg of Mg-10wt.% Y binary master alloy ingots into the melting furnace, heat up and melt; when the temperature rises to 400°C, start The inert gas Ar gas is introduced to protect the melt from oxidation and combustion;

[0028] Step 3: When the Mg-Y binary master alloy is completely melted, raise the temperature to 730°C, add the Mg-Gd binary master alloy; dilute the original Mg-Y alloy melt; hold it with iron clamps The Mg-60wt.% Gd master alloy ingot is placed under the liquid su...

Embodiment 2

[0032] A method for melting 68 kg of Mg-Gd-Y ternary master alloy, wherein the alloy composition (weight percentage) is 7.88% Gd, 5.25% Y, and the rest is Mg.

[0033] Step 1, the raw materials are 60.4kg Mg-7.5wt.%Y binary master alloy and 10.2kg Mg-60wt.%Gd binary master alloy ingot; clean the surfaces of the two binary master alloys and preheat them to 250°C;

[0034] Step 2: Turn on the melting furnace, which adopts resistance melting furnace equipment, and add Mg-7.5wt.%Y binary master alloy ingots into the melting furnace, heat up and melt; when the temperature rises to 450°C, start to pass into Ar gas and SF 6 The mixed gas protects the melt from oxidation and combustion;

[0035] Step 3: After all the alloys in the melting furnace are melted, raise the temperature to 740°C, add Mg-60wt.%Gd binary master alloy ingot; dilute the original Mg-Y alloy melt; use iron clamps to clamp Hold the Mg-60wt.%Gd intermediate alloy ingot under the liquid surface of the melt, and sl...

Embodiment 3

[0039] A method for smelting a 69kg Mg-Gd-Y ternary master alloy, wherein the alloy composition (percentage by weight) is 10.5% Gd, 3.5% Y, and the rest is Mg.

[0040]Step 1, get the Mg-5wt.%Y binary master alloy of 60.5kg and the Mg-80wt.%Gd binary master alloy ingot of 10.4kg; Clean up the two kinds of binary master alloy surfaces, and preheat to 350°C;

[0041] Step 2: Open the melting furnace, add Mg-5wt.% Y binary master alloy into the melting furnace, heat up and melt; when the temperature rises to 500°C, start to introduce CO 2 with SF 6 The mixed gas protects the melt from oxidation and combustion;

[0042] Step 3: After all the alloys in the melting furnace are melted, raise the temperature to 750°C, add Mg-80wt.%Gd binary master alloy ingots, and dilute the original Mg-Y alloy melt. Use iron clips to fix the Mg-80wt.%Gd intermediate alloy ingot and place it under the liquid level of the melt, and slightly stir the alloy ingot, which is beneficial to the uniformit...

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Abstract

The invention discloses a method for preparing a magnesium-gadolinium-yttrocalcite ternary intermediate alloy in the technical field of metallurgy, which comprises the following steps: preheating a Mg-Y binary intermediate alloy and a Mg-Gd binary intermediate alloy to 150 to 350 DEG C; putting the Mg-Y binary intermediate alloy in a smelting furnace for smelting and starting to introduce a protective gas when the temperature rises to 400 to 500 DEG C; after the Mg-Y binary intermediate alloy is smelted completely, rising the temperature to 730 to 750 DEG C, and adding the Mg-Gd binary intermediate alloy; after the Mg-Gd binary intermediate alloy is smelted completely, keeping the temperature of the melt between 730 to 750 DEG C, adding a refining agent, and refining the melt; and after the refining, keeping the temperature at 730 to 750 DEC C, and standing the melt to obtain the Mg-Gd-Y ternary intermediate alloy. The preparation method of the invention avoids the use of pure magnesium, saves time for smelting pure magnesium, reduces the oxidization and burning loss of magnesium elements in a pure magnesium smelting process, and achieves high rare earth element yield.

Description

technical field [0001] The invention relates to a preparation method in the field of metallurgy technology, in particular to a preparation method of a magnesium-gadolinium-yttrium ternary master alloy. Background technique [0002] With the development of magnesium alloys, Mg-RE magnesium alloys have broad development prospects in high-tech fields such as aerospace, military industry, and automobiles due to their excellent mechanical properties and high-temperature creep resistance. When rapidly expanding and correspondingly applied to industrial production, new requirements are put forward for the smelting technology of its magnesium rare earth alloy: under the premise of ensuring the performance of the alloy, a qualified magnesium rare earth alloy is smelted in the shortest time with the least energy , which not only reduces the time of alloy smelting and the loss of metal elements, saves production costs, but also can accurately control the composition of the alloy. Ther...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C1/06
Inventor 陈长江王渠东尹冬第丁文江
Owner SHANGHAI JIAO TONG UNIV
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