Low-cooling-rate-sensitivity high-nucleation-capability AlNbBRE refiner for cast aluminum alloy and preparation method of refiner

A technology of casting aluminum alloy and refining agent, which is applied in the field of refining agent for casting aluminum alloy, can solve the problems of high sensitivity to cooling rate, etc., and achieves low sensitivity to cooling rate, improved mechanical properties, and excellent refining effect. Effect

Active Publication Date: 2016-06-08
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to develop a grain refiner with low cooling rate sensitivity and high nucleation ability for casting aluminum alloy; another object is to propose a low cooling rate sensitive high nucleation a

Method used

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  • Low-cooling-rate-sensitivity high-nucleation-capability AlNbBRE refiner for cast aluminum alloy and preparation method of refiner
  • Low-cooling-rate-sensitivity high-nucleation-capability AlNbBRE refiner for cast aluminum alloy and preparation method of refiner
  • Low-cooling-rate-sensitivity high-nucleation-capability AlNbBRE refiner for cast aluminum alloy and preparation method of refiner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Preparation of Al-5Nb-B-0.5La-0.5Ce Grain Refiner

[0076] Target ingredients for formulating refiners:

[0077] The target composition of the refiner is Al-5Nb-B-0.5La-0.5Ce;

[0078] Dosage: 3.5Kg of Al-10Nb, 0.07Kg of boron (B) powder with a purity of 99.5% and 0.035Kg of boron (B) powder with a purity of 99.0wt% are required to prepare 7Kg of Al-5Nb-B-0.5La-0.5Ce refiner Metal lanthanum (La), 0.035 Kg of metal cerium (Ce) with a purity of 99.0 wt %, and the remainder of a block of Al with a size of 5×5 cm.

[0079] Ingot mold step;

[0080] Put the graphite ingot mold into the resistance furnace and heat it up to 200°C, keep it warm for 4 hours, then put the fully preheated ingot mold into the induction furnace, and install a sprue cup on the ingot mold, and add magnesium oxide to the sprue cup Ceramic filter, ready to pour. The sprue cup installed with the magnesia ceramic filter is beneficial to the cleanliness of the refiner melt.

[0081] Knot the crucible ...

Embodiment 2

[0099] Preparation of Al-4Nb-B-0.5La-0.5Er Grain Refiner

[0100] Target ingredients for formulating refiners:

[0101] The target composition of the refiner is Al-4Nb-B-0.5La-0.5Er;

[0102] Dosage: To prepare 10Kg of Al-4Nb-B-0.5La-0.5Er refiner, 4Kg of Al-10Nb, 2Kg of Al-5B master alloy block with a purity of 99.5%, and 0.05Kg of metal with a purity of 99.0wt% are required Lanthanum (La), 0.05 Kg of metal erbium (Er) with a purity of 99.0 wt%, and the balance of Al blocks with a size of 5×5 cm. The size of the Al-5B intermediate alloy block is 3×3 cm.

[0103] Ingot mold step;

[0104] Put the graphite ingot mold into the resistance furnace and heat it up to 300°C, keep it warm for 2 hours, then put the fully preheated ingot mold into the induction furnace, and install a sprue cup on the ingot mold, and add magnesium oxide to the sprue cup Ceramic filter, ready to pour. The sprue cup installed with the magnesia ceramic filter is beneficial to the cleanliness of the ref...

Embodiment 3

[0123] Al-3Nb-0.6B-0.5Y-0.5Ce grain refiner

[0124] Target ingredients for formulating refiners:

[0125] The target composition of the refiner is Al-3Nb-0.6B-0.5Y-0.5Ce;

[0126] Dosage: To prepare 7Kg of Al-3Nb-0.6B-0.5Y-0.5Ce refiner, 2.1Kg of Al-10Nb, 0.042Kg of boron (B) powder with a purity of 99.5%, and 0.035Kg of a purity of 99.0wt% are required metal yttrium (Y), 0.035Kg of metal cerium (Ce) with a purity of 99.0wt%, and the remainder of a block of Al with a size of 5×5 cm.

[0127] Ingot mold step;

[0128] Put the graphite ingot mold into the resistance furnace and heat it up to 400°C, keep it warm for 2 hours, then put the fully preheated ingot mold into the induction furnace, and install a sprue cup on the ingot mold, and add magnesium oxide to the sprue cup Ceramic filter, ready to pour. The sprue cup installed with the magnesia ceramic filter is beneficial to the cleanliness of the refiner melt.

[0129] Knot the crucible step;

[0130] In the knotted cru...

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Abstract

The invention discloses a low-cooling-rate-sensitivity high-nucleation-capability AlNbBRE grain refiner for cast aluminum alloy and a method for preparing the refiner by adopting induction smelting; the ingredients of the refiner are Al-xNb-yB-zRE, wherein x is larger than 0.01wt% and smaller than or equal to 6wt%, y is larger than 0.01wt% and smaller than or equal to 3wt%, z is larger than 0.01wt% and smaller than or equal to 1wt%, and the balance is Al; RE is one of or a mixture of two of La, Ce, Nd, Er, Gd, Y, Yb and Sc. The method is simple in preparation process and capable of accurately controlling the ingredients of the refiner. The refiner is excellent in refining effect when being used for performing grain refinement on cast aluminum-silicon alloy and is relatively low in cooling rate sensitivity on the refining effect of the positions, complicated in shape and different in thickness, of a cast piece, namely of the positions different in cooling rate; the mechanical properties of the refined alloy are remarkably improved; the performance differences of the positions which are different in cooling rate are remarkably reduced.

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] Aluminum-silicon 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 Rare earth elements (RE) have excellent physical and chemical properties, and people have also begu...

Claims

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Application Information

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IPC IPC(8): C22C1/06C22C21/00C22C1/03
CPCC22C1/026C22C1/03C22C1/06C22C21/00
Inventor 张花蕊张虎
Owner BEIHANG UNIV
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