High -purity metal and alloy ingots manufacturing methods with a complete class grain tissue

Abstract

The invention provides a method for manufacturing a high-purity metal and alloy cast ingot with a completely-equiaxed grain structure. The method includes the steps that metal in a crucible is heated to be completely melted; the temperature of the molten metal in the crucible is gradually reduced; when the temperature of melts is reduced to a certain temperature Tx below the freezing point Tm of the melts or liquidus temperature, a small number of metal crystals start to be formed in the melts; a cutting bar is inserted into the melts and fixed, and dendritic crystals suspending in the melts are driven by liquid to collide with the cutting bar and cut by the cutting bar so as to be broken and form a large number of tiny nucleation cores; the cutting bar is lifted up, a pressing head is quickly rotated to be above the crucible and is slightly pressed downwards, metal in the crucible is quickly cooled, and finally the completely-equiaxed metal cast ingot with even and tiny crystal particles is formed. By adopting the method, the molten metal can be prevented from being oxidized, uniform refining of the metal cast ingot is achieved, and chemical refiners are prevented from being used; in this way, the method is suitable for refining of high-purity metal or alloy.

Description

technical field [0001] The invention relates to a method for manufacturing a metal ingot with uniform composition and structure in the field of casting, in particular to a method for manufacturing a high-purity metal and alloy ingot with a complete equiaxed grain structure. Background technique [0002] Obtaining a complete and uniform equiaxed grain structure of the ingot can improve its mechanical properties and process performance. There are two main technical paths currently adopted: [0003] One is to put a refiner into the melt to refine the structure by promoting nucleation. For example, Chinese patent 200410067790.1 provides a mixed salt refiner. The method is low in cost, simple in operation, and widely used in industry. However, the use of a refiner also changes the composition of the material, making this method unsuitable for producing metal ingots with higher purity. [0004] The second is the semi-solid casting method. The principle was discovered by David ...

AI Technical Summary

Problems solved by technology

[0005] In view of the defects in the prior art, the purpose of the invention is to provide a method for manufacturing high-purity metal and alloy ingots with complete equiaxed grain structure, to solve the problem of grain structure refinement of high-purity metal and alloy thereof, and to use Production of ingots of pure and slightly alloyed metals

Images