Calcium remover for aluminum-silicon alloy and preparation method thereof

Abstract

The invention belongs to the field of metal material, which is a calcium remover for aluminum-silicon alloy and a preparation method thereof. The calcium remover comprises aluminum and fluorine; the calcium remover is characterized by further comprising nickel, silicon, boron and carbon, the mass percentage of each element is as follows: 11.0-21.0% of the aluminum, 24.0-44.0% of the fluorine, 5.0-30.0% of the nickel, 7.0-35.0% of the silicon, 0.1-5.0% of the boron and 5.0-20.0% of the carbon. The preparation method comprises the following steps: weighing each material according to the mass percentage, 35-65% of AlF3, 20-50% of master alloy Ni-Si-B and 5-20% of carbon powder; performing rapid solidification processing of argon aerosol to the master alloy Ni-Si-B, obtaining granular master alloy Ni-Si-B; uniformly mixing the AlF3 powder, the granular Ni-Si-B powder and the carbon powder, using a briquetting machine to press the powder, and preparing into lumpish calcium remover. The calcium remover for the aluminum-silicon alloy of the invention is highly efficient and environmentally friendly, simple in preparation process, good in process stability, low in cost and the like; when the adding amount is 0.2%, the calcium content in the industrial aluminum-silicon piston alloy is reduced lower than 20 ppm, and the calcium remover for the aluminum-silicon alloy is a novel modification agent similar to eutectic Al-Si alloy.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to an aluminum-silicon alloy decalcifier and a preparation method thereof. Background technique [0002] Eutectic and hypereutectic aluminum-silicon alloys have the advantages of small thermal expansion coefficient, good volume stability, good wear resistance, high strength, and good process performance, and have become the most widely used piston materials at home and abroad. In order to improve the mechanical properties of aluminum-silicon alloys, it must be modified. At present, the most widely used modification in the industry is the modification of phosphorus. Calcium (Ca), silver-white light metal, soft, density 1.54g / cm 3 , chemically active, almost all metal oxides can be reduced when heated. Calcium is one of the main impurities in industrial aluminum-silicon alloys, which is mainly introduced from the raw material industrial crystalline silicon. Researches at home and abr...

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Problems solved by technology

However, a large amount of chlorine gas is released during the chlorination process, causing serious environmental pollution.

There is a literature (Internal Combustion Engine Parts, 2005; 5:24) that uses Al-C master alloy to remove calcium, and found that the addition of Al-C master alloy can significantly reduce the calcium content, but the amount added when using the master alloy is relatively large

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