Directional Solidification Device and Process Method for Improving Single Crystal Blade Deposit

Abstract

The invention discloses a directional solidification device, in particular discloses a directional solidification device and a process method for improving single crystal blade deposits, and belongs to the technical field of single crystal casting process equipment design and manufacture. Provided are a directional solidification device and a process method for improving single crystal blade deposits which can effectively improve crystal selection quality and reduce or reduce deposition of trace components. The directional solidification device includes a water cooling plate and a crystal selector arranged at the bottom of the mold shell, the bottom of the crystal selector is seated on the water cooling plate, and the directional solidification device also includes an air film isolation system, and the water cooling plate A gas film isolation layer is formed between the crystal selector and the inert gas output by the gas film isolation system. The process method adopts firstly passing gas through a gas film isolation system to form a gas film isolation layer, and then performing pouring, drawing, cooling and solidification of the single crystal blade.

Description

technical field [0001] The invention relates to a directional solidification device, in particular to a directional solidification device for improving single crystal blade deposits, and belongs to the technical field of design and manufacture of single crystal casting process equipment. The invention also relates to a process for producing single crystal blades by using the directional solidification device. Background technique [0002] Single crystal turbine blades are widely used in aero engines and gas turbines. At present, the directional solidification technology is used in the industry to prepare single crystal blades through the crystal selection method. Directional solidification is the use of forced means in the solidification process to establish a temperature gradient in a specific direction in the solidified metal and the unsolidified melt, so that the melt solidifies in the direction opposite to the heat flow to obtain a columnar crystal with a specific orien...

AI Technical Summary

Problems solved by technology

[0004] Due to the low temperature of the water cooling plate at the bottom of the crystal selector, the atmosphere in the furnace and the trace components in the mold shell will be deposited on the water cooling plate, the bottom plate of the mold shell or the crystal selector during the directional solidification constant temperature and drawing process, resulting in failure of crystal selection or final selection. The obtained single crystal structure does not meet the technical requirements, so the blade has inclusions or miscellaneous crystal defects

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