Zone melting and directional solidifying method used for volatile element alloy

Abstract

The invention discloses a zone melting and directional solidifying method used for a volatile element alloy. The method comprises the following steps of: selecting raw metals according to alloy components; matching the raw metals selected; smelting into an initial alloy bar; transferring into a directional solidifying crucible; fully filling slag forming constituents into a clearance between the initial alloy bar and the directional solidifying crucible; transferring the directional solidifying crucible into a directional solidifying device; and heating through an induction coil to realize zone melting of the initial alloy bar and the slag forming constituents, wherein volatile components of the alloy are prevented from volatilizing through the molten slag forming constituents, and the slag forming constituents react with impurities in the alloy to generate molten slag; the directional solidifying device downwards moves relative to the induction coil to accomplish the zone melting and directional solidifying of the whole initial alloy bar; the molten slag is continuously generated and floats upwards, and then stops on the top of the alloy and finally is removed. By adopting such directional solidifying method, the consumption in volatilizing of the volatile element of the alloy can be greatly reduced during solidifying, the impurities and air pores are removed at the same time, and the alloy with components approaching to design components and having a uniform distribution an axial direction can be obtained.

Description

technical field [0001] The invention relates to an alloy solidification method, in particular to a region melting directional solidification method for volatile element alloys. Background technique [0002] Preventing the volatilization and burning loss of volatile elements during the solidification process has always been the core problem in the preparation of alloy materials, especially in the slow directional solidification process of functional materials, the volatilization and burning loss of these volatile elements will lead to the actual composition of the alloy Deviation from the design composition will eventually cause the alloy to lose its original design functionality. [0003] As far as functional materials are concerned, their functionality often only exists in a specific crystal orientation, and the traditional Bridgeman method, which completely melts the material and then directional solidifies, easily leads to uneven distribution of axial components, so it ne...

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Problems solved by technology

[0002] Preventing the volatilization and burning loss of volatile elements during the solidification process has always been the core problem in the preparation of alloy materials, especially in the slow directional solidification process of functional materials, the volatilization and burning loss of these volatile elements will lead to the actual composition of the alloy Deviating from the design composition, the alloy will eventually lose its original design functionality

[0003] As far as functional materials are concerned, their functionality often only exists in specific crystal orientations, and the traditional Bridgeman method, which completely melts the material and then directional solidifies, easily leads to uneven distribution of axial components, so it needs to pass Advanced methods such as regional melting and directional solidification are used to achieve

According to the characteristics of directional solidification, it can be known that the slower the crystal growth rate, the easier it is to obtain highly preferentially oriented crystals, and at the same time, the loss of volatile elements is also greatly increased.

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