Semi-continuous casting device for preparation of aluminum matrix composites

Abstract

The invention discloses a semi-continuous casting device for preparation of aluminum matrix composites. The semi-continuous casting device for preparation of the aluminum matrix composites comprises a smelting holding furnace, a charging device, an air supply device, a rotation driving device, a connecting mechanism, a stirring device, a crystallizer, a heat preservation device and a runner. The smelting holding furnace communicates with the runner. The runner communicates with the heat preservation device. The heat preservation device communicates with the crystallizer. The stirring device is mounted in the heat preservation device. The charging device and the air supply device communicate with the stirring device through the connecting mechanism. The rotating driving device is connected with the stirring device and drives the stirring device to rotate. According to the semi-continuous casting device for preparation of the aluminum matrix composites, in the semi-continuous casting process, a stirring rod is arranged near the solidification front of aluminum alloy melt, reinforcement powder is continuously added to the position near the solidification front in a quantitative mode, highs-speed stirring is conducted through the stirring rod, and an aluminum matrix composite cast ingot is obtained along with downward movement of a dummy ingot; and the probability of floating of reinforcement in the melt can be greatly lowered, defects such as oxide films are reduced, and meanwhile, the semi-continuous casting device is suitable for industrial continuous production.

Description

technical field [0001] The invention relates to a semi-continuous casting device for preparing aluminum-based composite materials, belonging to the technical field of aluminum-based composite materials preparation. Background technique [0002] Aluminum matrix composites mainly use pure aluminum or aluminum alloy as the matrix. By adding particles, fibers or whiskers and other substances to improve the structure of the alloy matrix and improve the performance of the material, commonly used reinforcements include SiC, Al 2 o 3 , graphene, and carbon nanotubes. The main preparation methods of aluminum matrix composites include powder metallurgy, pressureless infiltration, in-situ synthesis and stirring casting. The powder metallurgy method is to uniformly mix the reinforcement and the metal powder, and then perform ball milling, drying, compaction and sintering, etc., but the production cost of this method is high, and the structure of the reinforcement is easy to be damaged...

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Problems solved by technology

Patent CN201510695932.7 adopts a tundish between the smelting / holding furnace and the casting platform, quantitatively adds rods or foils containing CNTs to the tundish, applies electromagnetic and ultrasonic stirring to obtain an aluminum melt containing CNTs reinforcement, and passes through the launder Enter the crystallizer to cast aluminum-based composite materials; in this method, during the semi-continuous casting process, the reinforcement may float up in the aluminum melt, and it is difficult to accurately control the addition ratio of the reinforcement in the melt

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