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Low-cooling-rate-sensitivity high-nucleation-ability AlNbBRE grain refiner for cast aluminum alloy and preparation method thereof

A grain refiner and a technology for casting aluminum alloys, which are applied in the field of refiners for casting aluminum alloys, can solve the problems of high sensitivity to cooling rate, and achieve low sensitivity to cooling rate, improve metamorphic effect and refinement effect. excellent effect

Active Publication Date: 2016-06-01
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to develop a grain refiner with low cooling rate sensitivity and high nucleation ability for casting aluminum alloys and its preparation method, so as to solve the problem that the refinement effect of commonly used refiners is sensitive to cooling rate in industrial practical applications. big bottleneck problem

Method used

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  • Low-cooling-rate-sensitivity high-nucleation-ability AlNbBRE grain refiner for cast aluminum alloy and preparation method thereof
  • Low-cooling-rate-sensitivity high-nucleation-ability AlNbBRE grain refiner for cast aluminum alloy and preparation method thereof
  • Low-cooling-rate-sensitivity high-nucleation-ability AlNbBRE grain refiner for cast aluminum alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Al-2Nb-B-0.4La-0.6Ce grain refiner and its preparation method.

[0064] Step one, ingredients;

[0065] Make the Al-2Nb-B-0.4La-0.6Ce target composition of 100 weight parts, the required raw material is the Al-10Nb of 20 weight parts, the purity of 1 weight part be 99.5% potassium fluoroborate (KBF 4 ) powder, 0.4 parts by weight of metal lanthanum (La) with a purity of 99.0%, 0.6 parts by weight of metal cerium (Ce) with a purity of 99.0%, and the remainder of a block of Al with a size of 5cm×5cm.

[0066] Step 2, preparation of auxiliary materials for smelting

[0067] Use a dust collector to clean the graphite crucible, mold, inner wall of the bell jar, and skimming spoon, preheat it at 220°C for 3 hours, and evenly brush the protective paint on the surface of the mold, bell jar, and skimming spoon to avoid it from being mixed with When the molten aluminum contacts, impurities such as iron are brought into the molten aluminum,

[0068] In the present invention, th...

Embodiment 2

[0081] Al-4Nb-0.8B-0.5La-0.5Y grain refiner and its preparation method.

[0082] Step one, ingredients;

[0083] Make the Al-4Nb-0.8B-0.5La-0.5Y target composition of 100 weight parts, the required raw material is the Al-10Nb of 40 weight parts, the purity of 0.8 weight part be 99.5% potassium fluoroborate (KBF 4 ) powder, 5 parts by weight of an Al-10La master alloy block with a size of 3×3 cm, 5 parts by weight of an Al-10Y master alloy block with a size of 3×3 cm, and the remainder of an Al block with a size of 5×5 cm.

[0084] Step 2, preparation of auxiliary materials for smelting

[0085] Use a dust collector to clean the graphite crucible, mold, inner wall of the bell jar, and skimming spoon, preheat it at 300°C for 2 hours, and evenly brush protective paint on the surface of the mold, bell jar, and skimming spoon to avoid it When the molten aluminum contacts, impurities such as iron are brought into the molten aluminum,

[0086] In the present invention, there are 2...

Embodiment 3

[0100] Al-3Nb-0.6B-0.6La-0.4Ce grain refiner and its preparation method.

[0101] Step one, ingredients;

[0102] To make 100 parts by weight of Al-3Nb-0.6B-0.6La-0.4Ce target composition, the required raw materials are 30 parts by weight of Al-10Nb, 12 parts by weight of Al-5B master alloy block (size is 3 * 3cm) , 0.6 parts by weight of metal lanthanum (La) with a purity of 99.0%, 0.4 parts by weight of metal cerium (Ce) with a purity of 99.0%, and the rest of Al blocks with a size of 5×5 cm.

[0103] Step 2, preparation of smelting auxiliary materials

[0104] Use a dust collector to clean the graphite crucible, mold, inner wall of the bell jar, and skimming spoon, preheat it at 280°C for 2.5 hours, and evenly brush protective paint on the surface of the mold, bell jar, and skimming spoon to avoid When in contact with molten aluminum, impurities such as iron are brought into the molten aluminum,

[0105] In the present invention, there are 22% by weight of chalk powder, ...

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Abstract

The invention discloses a low-cooling-rate-sensitivity high-nucleation-ability grain refiner for cast aluminum alloy and a preparation method thereof. The grain refiner comprises Al-xNb-yB-zRE, wherein x is higher than 0.01wt% and not higher than 6wt%, y is higher than 0.01wt% and not higher than 3wt%, z is higher than 0.01wt% and not higher than 1wt%, and the balance Al; RE is one or more of La, Ce, Nd, Er, Gd, Y, Yb and Sc. Meanwhile, the invention discloses the smelting method for preparing the grain refiner, and the preparation technological process is simple. The grain refiner is used for carrying out grain refining on the cast aluminum-silicon alloy, the refining effect is superior, the cooling-rate sensitivity on the refining effects of casting portions in complex shapes and different thicknesses, namely the portions with different cooling rates is low, the mechanical performance of the refined alloy is remarkably improved, and the difference of performance between the portions with the different cooling rates is remarkably lowered.

Description

technical field [0001] The invention relates to a refiner for casting aluminum alloys, more particularly to an Al-Nb-B-RE grain refiner for casting aluminum alloys with low cooling rate sensitivity and high nucleation ability. Background technique [0002] Cast AlSi alloys are widely used in industry due to their good mechanical properties and excellent casting properties. Refining the grains of the alloy can obtain a dense alloy structure, and at the same time reduce the tendency of hot cracking and segregation of the casting, and reduce the porosity, thereby improving the overall performance of the alloy. The most common and effective refinement method is to add grain refiners to the alloy. At present, people generally use Al-Ti, Al-Ti-C or Al-Ti-B master alloy as the grain refiner of aluminum alloy, among which Al-Ti-B refiner has been widely used. Recently, due to RE has excellent physical and chemical properties, and people have also begun to use RE as a refiner or mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00B22D27/20
CPCB22D27/20C22C21/00
Inventor 张花蕊张虎
Owner BEIHANG UNIV
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