Casting mold for producing high-temperature alloy single crystal blades and directional solidification device thereof

Abstract

The invention provides a casting mold for producing high-temperature alloy single crystal blades. The casting mold is applied to a directional solidification device. The casting mold is in a cylindrical shape and comprises an inner-layer ceramic shell and an outer filling interlayer, wherein an inner cavity formed by the ceramic shell is used for pouring high temperature alloy melts to form high-temperature alloy castings, and the periphery of the ceramic shell is filled with heat conduction materials and thermal insulation materials alternately through a barrel-shaped hoarding to form a filling entity provided with a plurality of horizontal heat conduction layers and thermal insulation layers through bonding. According to the entity heat conduction casting mold process, pouring and directional solidification can be performed in the existing directional solidification furnace, all sides of blades can be evenly heated, and therefore the severe shadow effect and organizational defects caused by the shadow effect can be eliminated effectively; and the condition that cold and hot areas in the existing device are almost through is changed, closed isolation between hot areas and cold areas is achieved, reduction of heat losses is facilitated, temperature gradients in castings is increased greatly, and the optimal temperature condition for growth of single crystals is formed.

Description

technical field [0001] The invention relates to precision casting of high-temperature alloy components, in particular to a solid heat-conducting mold and a directional solidification device for manufacturing high-temperature alloy single-crystal blades. 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 directional solidification, such as figure 1 shown. Make the ceramic formwork 3 of superalloy single crystal blade with the method for precision casting earlier for this reason, for guaranteeing strength, ceramic formwork 3 is generally thicker, and the thickness of its thickest part can reach several centimeters. The ceramic mold shell 3 is placed in the heating chamber of the directional solidification device for heating, and then the melted superalloy sample 4 is poured into the ceramic mold shell 3, and slowly des...

AI Technical Summary

Problems solved by technology

[0006] The third is that the shape of the blade is complex and the cross-section changes greatly. In the drawing project of the ceramic formwork 3 from the hot zone A to the cold zone B in the heating chamber, the two zones cannot be effectively isolated and are basically in a connected state, which not only causes serious heat loss, It is even more impossible to establish a higher temperature gradient to ensure the formation of a single crystal structure

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