Prepn process of composite Al-Ti-C grain refining agent for aluminium and aluminium alloy

Abstract

The present invention is preparation process of composite Al-Ti-C grain refining agent for aluminum and aluminum alloy with raised cooling speed, less Ti-C particle interface aggregation and raised Al-Ti-C grain refining performance. The preparation process includes: mixing material in certain weight proportion, pressing the mixture into cylindrical prefabricated block, stoving at 15-200 deg.c for 2 hr, pressing prefabricated block into aluminum melt at 760-820 deg.c to reach Ti content of 3-5%, hot-blast synthesis reaction and maintaining at 760-820 deg.c for 2 min, stirring the aluminum melt mechanically at 60-100 rpm for 5-10 min for the synthesized material to be diluted and dispersed well in the aluminum melt, standing for 5-10 min and casting in metal mold to obtain the product.

Description

technical field [0001] The invention relates to a preparation method of an aluminum and aluminum alloy composite grain refiner, belonging to the technical field of metal material processing. Background technique [0002] The master alloy used as the grain refiner of aluminum and various aluminum alloys can obviously improve the mechanical properties and physical properties of aluminum and aluminum alloys. Al-Ti-C is a new type of refining agent for aluminum and aluminum alloys. It has the advantages of small TiC particle size, low aggregation tendency in molten aluminum, and is not easily poisoned by atoms such as Zr and Cr. It is a hot research topic at home and abroad in recent years. It has a good application prospect in the aluminum processing industry, especially in the aluminum sheet, strip and foil processing industry. [0003] Since the wettability of C element to Al liquid is extremely poor, the key to preparing Al-Ti-C master alloy is how to effectively introduce ...

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Problems solved by technology

[0005] Xiadong et al. of Lanzhou University of Technology applied for the patented self-propagating high-temperature synthesis (SHS) in 2003, and prepared the Al-Ti-C master alloy of aluminum and aluminum alloy grain refiners, and can control the TiC and Al3Ti in it. The proportion and shape of the phase, the TiC particle size in the obtained Al-Ti-C alloy is small, which can reach submicron level, but the alloy is cooled slowly after the synthesis process, and there is a phenomenon of TiC particle grain boundary aggregation, which affects the Al-Ti-C Refinement performance

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