Method for preparing bimetallic composite material through pouring continuous casting

Abstract

The invention provides a method for preparing a bimetallic composite material through pouring continuous casting. The method comprises the steps: (a) cooling liquid-state metal melt in a crystallizer, and forming an inverted-conical coagulating liquid hole under the action of a continuous casting dummy bar; (b) adding semi-solid-state metal slurry into the coagulating liquid hole through a diversion system, and carrying out coagulation, thereby obtaining a bimetallic composite cast ingot. The invention further provides equipment for preparing the bimetallic composite material through pouring continuous casting. According to the method and the equipment, firstly, the coagulating liquid hole with certain depth is formed by using the traditional continuous casting principle, and then, the semi-solid-state metal slurry is poured into the coagulating liquid hole through the diversion system, so that heterogeneous metal fluid coating composite casting is achieved; during coagulation, the internal semi-solid-state metal slurry and the outer-layer metal melt are subjected to convective mass transfer at an interface, and metal in the crystallizer is subjected to gradual coagulation from outside to inside, so that the bimetallic composite material, of which gradient transition of alloy composition to semi-solid-state texture to dendrite texture is formed between metal of inner and outer layers, is obtained.

Description

technical field [0001] The invention belongs to the technical field of composite metal ingot processing, and in particular relates to a method for preparing bimetallic composite materials by pouring continuous casting. Background technique [0002] The research on bimetallic composite materials has a history of more than half a century so far, although its preparation methods have derived various types from solid / solid composite, solid / liquid composite, to liquid / liquid composite, and then to semi-solid / solid composite. There are many composite processes, but there is only one essence: to obtain a continuous, stable and high-strength bonding interface. A continuous, stable and high-strength bonding interface is extremely important for the practical application of bimetallic composites, and it is also the premise and basis for the preparation of high-performance, multi-purpose bimetallic composites. [0003] The metallurgical bonding interface is to make the two metal materi...

AI Technical Summary

Problems solved by technology

Therefore, if the technology and equipment for preparing bimetallic composite materials by liquid / liquid compounding can be used, relying on the unique properties of semi-solid metal paste, it is expected to solve the problems of uncontrollable interface width formed by liquid / liquid compounding, solid / solid compounding, solid / liquid In order to solve the problem of poor bonding strength of the interface formed by compounding, the "semi-solid / liquid composite technology" has been developed to provide a new idea for obtaining a continuous, stable, high-strength, and high-quality metallurgical bonding interface, and it is expected to develop a series of semi-solid non-branched High-performance bimetal composites with gradient distribution of crystal structure and dendrite structure on the interface

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