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Long-service-life aluminum-silicon alloy grain refiner and preparation method thereof

A technology of grain refiner and aluminum-silicon alloy, which is applied in the field of grain refiner for casting aluminum-silicon alloy, can solve the problems that restrict the large-scale application of Al-B alloy, accelerate the degradation process, and degrade

Inactive Publication Date: 2011-05-25
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, practice has proved that these refiners have serious degradation phenomena; there are two main reasons for this: first, the particles that are effective nucleation points in these master alloys are AlB 2 , it is easily dissolved in aluminum melt; in addition, AlB 2 Density difference with liquid aluminum allows it to settle during holding, accelerating the degradation process
The above degradation phenomena seriously restrict the large-scale application of Al-B alloys in casting Al-Si alloys. With the development of continuous casting technology, there is an urgent need for a long-life and anti-degradation refiner

Method used

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  • Long-service-life aluminum-silicon alloy grain refiner and preparation method thereof
  • Long-service-life aluminum-silicon alloy grain refiner and preparation method thereof
  • Long-service-life aluminum-silicon alloy grain refiner and preparation method thereof

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Embodiment Construction

[0029] Select the composition (wt.%) of the Al-B alloy refiner: B, 3.0 (in KBF 4 given in powder form); Al, balance.

[0030] The preparation process of Al-B alloy refiner is as follows:

[0031] (1) Raw material grinding: KBF 4 Powder grinding and drying;

[0032] (2) Briquetting: use a tablet press to dry the dried KBF 4 The powder is pressed into a round cake-shaped prefabricated block with a diameter of 40mm;

[0033] (3) Melting aluminum ingots: put industrial pure aluminum in a furnace to melt, and the temperature rises to 950°C;

[0034] (4) Synthesis reaction: carefully press the prefabricated blocks below the liquid surface of the aluminum melt, without any stirring during the reaction process, and use thermocouples to measure the temperature in real time during the whole process;

[0035] (5) Heat preservation: after the temperature stops rising, keep heat for 15 minutes;

[0036] (6) Slag removal: Use a slag spoon to skim off the residual salt of the product o...

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Abstract

The invention relates to a long-service-life aluminum-silicon alloy grain refiner and a preparation method thereof. The grain refiner is an Al-B alloy and comprises the following components in percentage by mass: 1.0 to 5.0 percent of boron and the balance of aluminum. The preparation method comprises the following steps of: porphyrizing the boron in the form of KBF4, drying and briquetting; adding into an aluminum melt; and smelting at the temperature of between 900 and 1,200 DEG C to synthesize the Al-B alloy, wherein AlB2 and AlB12 coexist in the Al-B alloy. The refiner prolongs the existing time of nucleation material points in the high-temperature melt, improves the settlement behavior of particles, and has the obvious characteristics of long service life, degradation resistance and high refinement efficiency when used as the grain refiner for casting aluminum-silicon alloys.

Description

technical field [0001] The invention relates to a refiner for casting aluminum-silicon alloy grain refinement, in particular to a long-life aluminum-silicon alloy grain refiner and a preparation method thereof. Background technique [0002] The traditional Al-5Ti-B grain refiner will be poisoned when casting aluminum-silicon alloy, so that the refinement efficiency of the refiner will be greatly reduced, or even completely lose the refinement effect (see S.A.Kori, B.S.Murty, M . Chakraborty, Mater. Sci. Eng. A283 (2000) 94.). The reason is that the interaction between the excess Ti in Al-5Ti-B and the Si in the aluminum-silicon alloy causes the nucleation particles to be wrapped (D.Qiu, J.A.Taylor, M-X.Zhang, P.M.Kelly, Acta Mater.55 (2007) 1447.). Therefore, someone has developed an Al-B master alloy as a "titanium-free" refiner for aluminum-silicon alloy casting (S.Nafisi, R.Ghomashchi, Mater.Sci.Eng.A452-453(2007) 445, and, Ding Chao, Liu Yuan, Li Yanxiang, Special Cas...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C21/00
Inventor 王同敏陈宗宁伏洪旺徐军李廷举
Owner DALIAN UNIV OF TECH
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