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A kind of preparation method of al-b-re master alloy

An intermediate alloy and intermediate frequency technology, which is applied in the field of materials and metallurgy, can solve the problems of material conductivity decline, achieve the effect of improving viscosity, avoiding rapid temperature rise, and ensuring smooth progress

Active Publication Date: 2017-05-31
HUNAN JINLIANXING SPECIAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as we all know, industrial pure aluminum usually contains a certain amount of impurity elements, such as Si, Fe, Ti, V, Cr, Zr, Mn, etc. fill their unfilled electron shells, causing the material's electrical conductivity to drop dramatically

Method used

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  • A kind of preparation method of al-b-re master alloy
  • A kind of preparation method of al-b-re master alloy
  • A kind of preparation method of al-b-re master alloy

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Effect test

Embodiment 1

[0037] The preparation method of the present embodiment Al-3B-0.5RE master alloy, concrete steps are as follows:

[0038] (1) Raw material preparation: calculate the weight of each raw material according to the ratio of Al-3B-0.5RE master alloy, and take by weighing for subsequent use;

[0039] (2) Melting of pure aluminum: heat 995kg aluminum ingot to 700°C in an intermediate frequency induction furnace until the aluminum ingot is completely melted into molten aluminum, and remove impurities and oxide films on the surface of the molten aluminum;

[0040] (3) Add potassium cryolite powder: spread 20kg of potassium cryolite powder on the surface of molten aluminum;

[0041] (4)KBF 4 The first feeding: when the potassium cryolite powder is completely melted, add KBF to the molten aluminum for the first time while stirring 4 245kg; the feeding speed is controlled at 18kg / min to reduce KBF 4 The volatilization; feed KBF 4 Continue to stir for 8 minutes after the end, then let ...

Embodiment 2

[0052] The preparation method of the present embodiment Al-4B-1RE master alloy, concrete steps are as follows:

[0053] (1) Raw material preparation: calculate the weight of each raw material according to the ratio of Al-4B-1RE master alloy, and take by weighing for subsequent use;

[0054] (2) Melting of pure aluminum: heat 985kg aluminum ingot to 680°C in an intermediate frequency induction furnace until the aluminum ingot is completely melted into molten aluminum, and remove impurities and oxide films on the surface of the molten aluminum;

[0055] (3) Add potassium cryolite powder: spread 25kg of potassium cryolite powder on the surface of molten aluminum;

[0056] (4)KBF 4 The first feeding: when the potassium cryolite powder is completely melted, add KBF to the molten aluminum for the first time while stirring 4 306kg; the feeding speed is controlled at 20kg / min to reduce KBF 4 volatilization; join KBF 4 Continue to stir for 5 minutes after the end, then let stand fo...

Embodiment 3

[0067] The preparation method of the present embodiment Al-5B-1RE master alloy, concrete steps are as follows:

[0068] (1) Raw material preparation: calculate the weight of each raw material according to the ratio of Al-5B-1RE master alloy, and take by weighing for subsequent use;

[0069] (2) Melting of pure aluminum: heat 975kg aluminum ingot to 720°C in an intermediate frequency induction furnace until the aluminum ingot is completely melted into molten aluminum, and remove impurities and oxide films on the surface of the molten aluminum;

[0070] (3) Add potassium cryolite powder: spread 15kg of potassium cryolite powder on the surface of molten aluminum;

[0071] (4)KBF 4 The first feeding: when the potassium cryolite powder is completely melted, add KBF to the molten aluminum for the first time while stirring 4 378kg; feeding speed is controlled at 15kg / min to reduce KBF 4 volatilization; join KBF 4 Continue to stir for 15 minutes after the end, then let stand for 2...

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Abstract

The invention discloses a manufacturing method of Al-B-RE intermediate alloy. The manufacturing method includes the specific steps that firstly, potassium tetrafluoroborate and molten aluminum conduct an alloying reaction in a medium-frequency induction furnace, the rare earth element is added, slag and gas are removed, casting is conducted, and the Al-B-RE intermediate alloy is obtained. According to the manufacturing method, by the adoption of the lower alloying temperature ranging from 680 DEG C to 720 DEG C of KBF4 and the molten aluminum, the feeding speed is controlled, evaporation of the KBF4 is reduced, feeding is conducted while stirring is conducted, the KBF4 can be evenly distributed on the reaction interface, the problems that the local portion is overheated and a product is segregated due to the accumulation of the KBF4 are avoided, and the chemical reaction speed and degree of the KBF4 can be increased, so that the B casting yield is increased, and production cost is reduced; and meanwhile, the temperature of the whole manufacturing process is controlled, and the elpasolite powder is laid on the molten aluminum to serve as a transition layer, so that the KBF4 raw material evenly reacts with the molten aluminum, the phenomenon that the temperature is increased rapidly due to the acute chemical reaction generated at the Al liquid local position is avoided, and the behavior of conversion from the AlB2 phase to the AlB12 phase is inhibited effectively.

Description

technical field [0001] The invention relates to a method for preparing an Al-B-RE master alloy, which belongs to the technical field of materials and metallurgy in the technical field of new materials. Background technique [0002] Aluminum (Al), atomic number 13, atomic weight 27, is a silver-white light metal with a melting point of about 660°C, a boiling point of 2327°C, and a density of 2.7g / cm 3 , has strong toughness and tensile strength, excellent electrical conductivity. Compared with the traditional conductive material metal copper, the conductivity is 62% of copper, but the density is only 33% of copper. Under the condition of the same resistance, the volume ratio of copper and aluminum is 0.618, and the weight ratio is 2.03, so the use of aluminum instead of copper as a conductive material has gained more and more applications. However, as we all know, industrial pure aluminum usually contains a certain amount of impurity elements, such as Si, Fe, Ti, V, Cr, Zr,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C21/00
CPCC22C1/026C22C1/03C22C21/00
Inventor 廖成伟陈闻天陈欢陈勇刚
Owner HUNAN JINLIANXING SPECIAL MATERIALS CO LTD
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