A kind of liquid metal cooling directional solidification casting and measuring method of shell temperature

Abstract

A method for measuring the temperature of liquid metal cooling directional solidification castings and mold shells. According to the structure and size design of ceramic mold shells, chilling plates, and brackets, molded ceramic protective tubes are manufactured. After the ceramic mold shells are installed and fastened, the thermocouples are put on The first ceramic insulating section and the second ceramic insulating section are inserted into the molded ceramic protection tube, and the molded ceramic protection tube is fixed on the bracket with a pipe collar, and the ceramic slurry and refractory aggregate protective layer are used to seal the molded ceramic protection tube and thermocouple Dip the measuring end of the thermocouple with a layer of ceramic slurry and insert it into the reserved hole of the mold shell, and fix it with ceramic slurry and refractory aggregate protective layer. The part of the thermocouple located in the holding furnace is made of ceramic slurry and refractory aggregate. Aggregate cover seal. The invention eliminates the influence of cracks in the ceramic mold shell on temperature measurement, does not generate large stress in the thermocouple protective layer, and is not prone to cracks, and is applied in the technical field of casting single crystal / directional superalloy blades prepared by liquid metal cooling method.

Description

technical field [0001] The invention relates to a method for measuring the temperature of liquid metal cooling and directional solidification castings and mold shells in the technical field of single crystal / directional superalloy blade casting prepared by liquid metal cooling method, and in particular relates to castings and mold shells in the process of liquid metal cooling and directional solidification temperature measurement. Background technique [0002] At present, with the development of gas turbines, the demand for large-size oriented and single-crystal castings is increasing. Therefore, the liquid metal cooling and directional solidification process used in the production of large-size oriented and single-crystal castings has also attracted more and more attention. The heat exchange is complicated during the cooling and directional process of superalloy liquid metal. Analyzing this process with the help of numerical simulation software has become the method for the...

AI Technical Summary

Problems solved by technology

[0003] Many literatures have published the cooling curve of castings in the process of liquid metal cooling and directional solidification, but few literatures describe the temperature measurement method in detail

Patent Publication No. CN102507033A discloses a method for measuring the temperature of castings during liquid metal cooling and directional solidification. This method is for the position where the thermocouple is located in the holding furnace: or the thermocouple is buried in the casting shell, and the temperature measurement test is added to the casting solidification process. Due to the influence of temperature changes, and the mold shell cracks after the casting is partially solidified, the thermocouple is easily short-circuited; or it is protected by an integral ceramic insulating tube. During the temperature measurement experiment, due to the large difference in thermal expansion coefficient between the insulating tube and the shell, the thermocouple seal is easy to Cracks occur, and liquid metal for cooling enters the protection tube and short-circuits the thermocouple

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