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Preparation method of Al-Nb-B alloy rod for grain refinement

A technology of grain refinement and grain refiner, which is applied in the field of preparation of metal grain refiner and refiner for aluminum-silicon alloy, can solve the problems of failure to meet the expectations of aluminum casting manufacturers, poor anti-recession performance, Low refinement efficiency and other problems, to achieve the effect of improved particle agglomeration, strong anti-fading performance, and improved refinement efficiency

Active Publication Date: 2019-02-26
SHANGHAI UNIV
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Problems solved by technology

[0007] Therefore, although the above-mentioned patents have all involved several grain refiners for casting aluminum alloys, they still cannot meet the expectations of aluminum casting manufacturers.
In order to overcome the technical bottleneck of poor anti-recession performance and low refining efficiency of aluminum niobium boron refiners, it is necessary to provide a process capable of preparing long-term high-efficiency grain refiners, which has become an urgent technical problem to be solved

Method used

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  • Preparation method of Al-Nb-B alloy rod for grain refinement
  • Preparation method of Al-Nb-B alloy rod for grain refinement
  • Preparation method of Al-Nb-B alloy rod for grain refinement

Examples

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Embodiment 1

[0032] In this example, see Figure 1 to Figure 5 , a method for preparing aluminum-niobium-boron alloy rods for grain refinement. The alloy is smelted by a fluoride-salt reaction method, directly cast into shape, and then hot-extruded from an aluminum-niobium-boron ingot to form an aluminum-niobium-boron alloy rod as an aluminum alloy Grain refiner material, the steps of the preparation method of the aluminum-niobium-boron alloy rod used for grain refinement are as follows:

[0033] a. Material preparation: Potassium fluoroborate KBF 4 As the B source material, aluminum block, niobium powder and potassium fluoroborate were respectively weighed as raw materials, and the raw materials were weighed and proportioned according to the following mass fractions:

[0034] 2.8wt.% Nb, 0.3wt.% B, the balance is Al;

[0035] b. Melting the Al ingot: heat and melt the aluminum block weighed in the step a, and keep it at 850°C for 30 minutes to make the chemical composition of the alumin...

Embodiment 2

[0046] This embodiment is basically the same as Embodiment 1, especially in that:

[0047] In this example, a method for preparing an aluminum-niobium-boron alloy rod for grain refinement uses a fluorine-salt reaction method to smelt the alloy, directly casts it into shape, and then hot-extrudes the aluminum-niobium-boron alloy rod from an aluminum-niobium-boron ingot The alloy rod is used as an aluminum alloy grain refiner material, and the steps of the preparation method of an aluminum-niobium-boron alloy rod for grain refinement are as follows:

[0048] a. Material preparation: Potassium fluoroborate KBF 4 As the B source material, aluminum block, niobium powder and potassium fluoroborate were respectively weighed as raw materials, and the raw materials were weighed and proportioned according to the following mass fractions:

[0049] 3.5wt.% Nb, 0.5wt.% B, the balance is Al;

[0050] b. Melting the Al ingot: heat and melt the aluminum block weighed in the step a, and keep...

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Abstract

The invention provides a preparation method of an Al-Nb-B alloy rod for grain refinement, and belongs to the field of grain refiner material preparation. The alloy consists of the following componentsby the mass percentage: 2.5-3.5 wt.% of Nb, 0.2-0.5 wt.% of B and the balance Al. The Al-Nb-B alloy rod is characterized by being formed by hot extrusion of an Al-Nb-B alloy ingot; the preparation method mainly includes the following steps: preparing materials, preparing an Al-Nb-B alloy liquid, moulding the Al-Nb-B alloy liquid by casting, preheating the Al-Nb-B alloy ingot, and carrying out hotextrusion of the Al-Nb-B alloy ingot into the alloy rod. The problem that NbAl3 and NbB2 particles are easy to agglomerate in a traditional direct casting moulding process is overcome because the Al-Nb-B grain refiner is prepared by the hot extrusion method. The NbAl3 and NbB2 particles in the prepared Al-Nb-B alloy rod are uniformly distributed, and stronger anti-recession performance and higherrefining efficiency are achieved.

Description

technical field [0001] The invention relates to a preparation method of a metal grain refiner, in particular to a preparation method of a refiner for an aluminum-silicon alloy, which is applied in the technical field of aluminum alloy smelting. Background technique [0002] Fine-grain strengthening is one of the important means to improve the strength and shape of materials, and it is an important way to improve the quality of aluminum materials. With the increasing application of aluminum alloys in high-tech fields, the requirements for the structure and properties of aluminum alloys are also getting higher and higher. How to obtain the best as-cast structure is the basis for controlling the deformed structure and its properties. In order to obtain a fine and uniform equiaxed grain structure, it is necessary to take necessary grain refinement measures. There are mainly chemical methods, thermal control methods and dynamic grain refinement methods for solidification microst...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C1/06C22C21/00
CPCC22C1/026C22C1/06C22C21/00
Inventor 李谦许晋
Owner SHANGHAI UNIV
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