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Zinc-aluminum-titanium-boron intermediate alloy and preparation method thereof

An intermediate alloy and aluminum alloy technology, applied in the field of metal alloy materials, can solve the problems of performance reduction, structural and performance changes, incomplete melting, etc., and achieve the effects of reducing production costs, efficient grain refinement, and reducing melting temperature

Inactive Publication Date: 2012-12-26
UNIV OF JINAN
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] Aluminum-titanium-boron master alloy is a very good aluminum and aluminum alloy refiner commonly used. This master alloy can also be used for grain refinement of zinc-aluminum alloy, but the melting temperature of aluminum-titanium-boron master alloy (higher than 661°C) and the melting temperature of zinc-aluminum alloy (382-600°C) have a large gap, and the addition of aluminum-titanium-boron intermediate alloy in the normal smelting process of zinc-aluminum alloy will have the problem of difficulty in melting or incomplete melting. As a result, it is difficult for the master alloy to be evenly distributed in the zinc-aluminum alloy, and the ideal grain refinement effect cannot be achieved
In order to solve this problem, it is necessary to increase the melting temperature of zinc-aluminum alloy or extend the holding time during refinement, which will increase the burning loss and oxidation of zinc elements in zinc-aluminum alloy, reduce its performance, and will inevitably greatly increase the production cost ;In addition, the aluminum content of zinc-aluminum alloy will change greatly after adding aluminum-based master alloy refiner, which may cause some changes in structure and properties
In addition, rare earth elements and some salts (such as K 2 TiF 6 、K 2 ZrF 6 ) can also produce grain refinement on zinc-aluminum alloys, but rare earths have the same problems as the above-mentioned aluminum-titanium-boron intermediate alloys, and other salt compounds will be produced in zinc-aluminum alloys when the salts are refined (such as KalF 4 ) is difficult to clean and becomes zinc-aluminum alloy inclusions, which deteriorates the mechanical properties. The bigger problem is that the absorption of effective refinement elements in salts is unstable, and it is difficult to precisely control the amount added

Method used

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  • Zinc-aluminum-titanium-boron intermediate alloy and preparation method thereof
  • Zinc-aluminum-titanium-boron intermediate alloy and preparation method thereof
  • Zinc-aluminum-titanium-boron intermediate alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] To prepare Zn-12wt.%Al-5wt.%Ti-1wt.%B master alloy, weigh Zn-18wt.%Al alloy, K 2 TiF 6 and KBF 4 Powder the two raw materials to make K 2 TiF 6 25% by weight of zinc-aluminum alloy, KBF 4 It is 11.3% of the weight of zinc-aluminum alloy. Mix the two fluoride salt powders evenly. Melt the Zn-18wt.%Al alloy to 600-830℃ in the crucible with a heating furnace, and then put K 2 TiF 6 and KBF 4 Add the mixed powder to the surface of the Zn-18wt.%Al alloy melt in three batches, and then continue to keep warm for 2-15 minutes after adding it completely. After stirring, it is poured into the mold, and after cooling, Zn-12wt.%Al-5wt.%Ti-1wt.%B master alloy can be obtained. The matrix of this alloy is mainly η-Zn and a small amount of α-Al, and TiB with a size of about 0.5 μm is dispersed in the matrix. 2 Particles and TiAl 3-x Zn x (0.04<x<1.7) phase.

[0035] Adding this master alloy in an amount of 0.5wt.% to the Zn-25Al alloy melt at 560°C for 10 minutes can signi...

Embodiment 2

[0038] To prepare Zn-14wt.%Al-2wt.%Ti-3wt.%B master alloy, weigh Zn-22.4wt.%Al alloy, K 2 TiF 6 and KBF 4 Powder the two raw materials to make K 2 TiF 6 10% of the weight of zinc-aluminum alloy, KBF 4 It is 33.9% of the weight of zinc-aluminum alloy. Mix the two fluoride salt powders evenly. Melt the Zn-22.4wt.%Al alloy to 600-830℃ in a crucible with a heating furnace, and then put K 2 TiF 6 and KBF 4 Add the mixed powder to the surface of the Zn-22.4wt.%Al alloy melt, and then continue to keep warm for 2-15 minutes after adding it completely, pour the upper oily melt in the crucible into the solidification mold, and fully stir the lower alloy melt before pouring into the mold, and the alloy melt can be cooled to obtain Zn-14wt.%Al-2wt.%Ti-3wt.%B master alloy. The matrix of this alloy is mainly the eutectic structure of η-Zn and α-Al and primary α-Al grains, and AlB is dispersedly distributed in the matrix. 2 and TiB 2 Two compound particles.

[0039] Adding this a...

Embodiment 3

[0041] To prepare Zn-45wt.%Al-5wt.%Ti-1wt.%B master alloy, weigh Zn-51wt.%Al alloy, K 2 TiF 6 and KBF 4 Powder the two raw materials to make K 2 TiF 6 25% by weight of zinc-aluminum alloy, KBF 4 It is 11.3% of the weight of zinc-aluminum alloy. Mix the two fluoride salt powders evenly. Melt the Zn-51wt.%Al alloy in a crucible to 600-830°C in a heating furnace, and then put K 2 TiF 6 and KBF 4 Add the mixed powder to the surface of the Zn-51wt.%Al alloy melt in three batches, and then continue to keep warm for 2-15 minutes after adding it completely, pour the upper oil melt in the crucible into the solidification mold, and fully stir the lower alloy melt After pouring into the mold, the alloy melt can be cooled to obtain Zn-45wt.%Al-5wt.%Ti-1wt.%B master alloy. The alloy matrix is ​​mainly η-Zn and α-Al, and TiAl is dispersed in the matrix. 3-x Zn x (0.042 particle.

[0042] Add this master alloy to the Zn-25Al alloy melt at 560°C in an amount of 0.5wt.% and keep it...

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Abstract

The invention discloses a zinc-aluminum-titanium-boron intermediate alloy and a preparation method thereof, and the intermediate alloy consists of the following components in percentage by weight: 0.022-12% of titanium, 0.01-3.5% of boron, 0.1-50% of aluminum and the balance of zinc. The intermediate alloy obtained by using the method disclosed by the invention has high-efficiency grain refinement action; and in addition, by using the method, the intermediate alloy has the aluminum content identical or similar to that of the zinc-aluminum alloy to be refined, so that the intermediate alloy has the melting temperature identical to or lower than that of the zinc-aluminum alloy to be refined, thus ensuring that the intermediate alloy is quickly melted and evenly distributed after being addedto the zinc-aluminum alloy during grain refining, thereby reducing the zinc-aluminum alloy melting temperature, shortening the melting and processing time, and greatly lowering the production cost.

Description

technical field [0001] The invention relates to a zinc-aluminum alloy refiner and a preparation method thereof, in particular to a zinc-aluminum-titanium-boron intermediate alloy and a preparation method thereof, belonging to the technical field of metal alloy materials. Background technique [0002] Zinc-aluminum alloy has excellent mechanical and processing properties, and has broad market application potential. However, hypereutectic zinc-aluminum alloys with an aluminum content greater than 5wt.% tend to form well-developed primary α-Al dendrites during the solidification process, resulting in shrinkage cavities, shrinkage porosity, and intragranular component segregation defects, resulting in a decline in mechanical properties and potential aging hazards of the product. In order to overcome the above problems, it is necessary to add a grain refiner to this type of zinc-aluminum alloy to refine the grain in actual production. Hypoeutectic zinc-aluminum alloys with alum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C18/04C22C1/03C22C1/02
Inventor 王振卿孟令娟杨中喜耿浩然
Owner UNIV OF JINAN
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