A system and method for real-time measurement of the temperature inside the formwork during directional solidification

Abstract

The invention provides a real-time temperature measurement system and method for the temperature of the superalloy in the mold shell during the heating, heat preservation and drawing process of a directional solidification furnace. The temperature measurement system includes thermocouples, fixing devices, connection plates, wires, and data recording devices. The thermocouples include two thick and thin ceramic tubes and B-type thermocouple wires. The thick ceramic tubes are single-hole, and the thin ceramic tubes are double-hole; the fixing device It is fixed on the water-cooled copper plate of the directional solidification furnace, and there are two upper and lower clips on it; the connecting plate includes stainless steel flange, copper column, fastening nut, sealing sleeve, sealing sleeve, and sealing ring; the wire is conductive copper wire; The data recording system is a multi-channel, multi-type temperature recorder. The temperature measurement system is low in cost and high in accuracy, and solves the problem that the temperature field in the mold shell is not easy to measure during the directional solidification process, and the recorded data can be output, which is convenient for research.

Description

Technical field [0001] The invention relates to the technical field of directional solidification temperature detection, in particular to a system and method for real-time determination of the temperature of a high-temperature alloy in a mold shell during a directional solidification process. Background technique [0002] With the development of aeroengine and gas turbine manufacturing technology, the manufacture of high-performance, long-life directional solidification blades has become one of the key technologies for the development of my country's high-tech manufacturing industry; and the application of single crystal superalloy blades makes the temperature in front of the aeroengine turbine larger The amplitude increases, the thrust increases, and the fuel consumption decreases; during the directional solidification process, the temperature field change plays a decisive role in the growth of the single crystal blade, and the real-time temperature measurement of the superalloy i...

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used temperature measurement methods for molten metal temperature measurement are indirect temperature measurement, that is, through the observation hole, using optical pyrometers and infrared thermometers to indirectly measure the temperature of the surface of molten metal. This temperature measurement method is affected by the environment. (such as the material of the observation hole glass, the attached dirt, the melting state of the liquid surface, etc.), the measured temperature is the surface temperature of the alloy liquid, not only the error of the measured result is large, but also the internal temperature of the alloy liquid cannot be obtained; One is direct temperature measurement, that is, the temperature measurement device (usually an armored thermocouple) is inserted into the alloy liquid for temperature measurement. This method of temperature measurement is less affected by the temperature measurement environment and has high accuracy.

However, the directional solidification process is all in the directional solidification furnace. The superalloy melt is poured in the mold shell, and the thermocouple needs to be inserted into the mold shell to make it contact with the alloy liquid. The finished armored thermocouple protection tube sold in the market is very thick and difficult to Meet the temperature measurement requirements of the alloy liquid in the directional solidification mold shell

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