Directional solidification device of a high-temperature alloy and use method thereof

Abstract

The invention provides a directional solidification device of a high-temperature alloy. The directional solidification device comprises a heating chamber and a mold casting and cooling chamber, wherein the heating chamber and the mold casting and cooling chamber are vacuum chambers which are communicated with each other up and down and insulate heat mutually; a lifting working platform is arranged in the cavity of the heating chamber and the mold casting and cooling chamber; a mold shell is arranged on the lifting working platform; the high-temperature alloy is poured into the mold shell in the heating chamber and enters into the mold casting and cooling chamber along with the descending of the lifting working platform so as to be subjected to directional solidification; a spraying and cooling device is arranged in the mold casting and cooling chamber, and the spraying and cooling device comprises spraying nozzles, a cooling-liquid conduit and a cooling-liquid container which are connected in sequence; the furnace outlet at the bottom of the heating chamber is uniformly provided with a circle of spraying nozzles; the spraying surfaces of the spraying nozzles correspond to the outer peripheral surface of the mold shell; and a spraying pump is arranged on the cooling-liquid conduit. The directional solidification device provided by the invention is simple and compact, is formed by providing the existing directional solidification furnace with only a few components without constructing a new furnace and changing the original structure, does not need to be provided with a heating device for melting and preserving heat so that the operation is simplified greatly, has an excellent cooling effect and can solve the problem on the heat dissipation of the blade mold shell easily and effectively and improve the growth condition of a single crystal blade.

Description

technical field [0001] The invention relates to the precision casting of superalloy parts, in particular to a directional solidification device and its application method used in the precision casting of high temperature alloy parts. Background technique [0002] In order to improve the performance of aero-engines and industrial gas turbines, high-temperature alloy turbine blades need to be made into columnar or single-crystal structures by precision casting and directional solidification. In the vacuum furnace, the superalloy is melted and poured into the high-temperature ceramic mold shell and slowly descends into the cold zone at a set speed, resulting in the bottom-up cooling of the ceramic mold shell and the directional solidification of the casting in the ceramic mold shell to form a superalloy columnar or single crystal structure. However, due to the poor thermal conductivity of the ceramic formwork, the efficiency of heat dissipation through radiation in a vacuum is...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a directional solidification device for superalloys and its application method, which can simply and effectively solve the heat dissipation problem of the blade formwork and improve the growth conditions of single crystal blades

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