Method for realizing composite coating on high-wear-resistance film thermocouple on FSW stirring head

Abstract

The invention relates to a method for realizing a composite coating on a high-wear-resistance film thermocouple on an FSW stirring head. The method comprises the following steps: pretreating a base body; depositing a pressure silicon bottom layer on the base layer; depositing an insulating heat-insulating layer on the pressure silicon bottom layer; depositing a film thermocouple on the insulatingheat-insulating layer for insulating the film thermocouple from the base body; depositing a transition layer on the insulating heat-insulating layer and the film thermocouple, and depositing a ta-c layer on the transition layer. The method is beneficial for realizing high-precision high-real-time temperature measuring performance.

Description

technical field [0001] The invention relates to the technical field of making a composite coating, in particular to a composite coating method for making a high wear-resistant film thermocouple on a FSW stirring head. Background technique [0002] Friction stir welding (full name friction stir welding, FSW for short) is an advanced green connection technology, which is widely used in high-tech industries such as spacecraft, ships, and new energy vehicles. The friction stir welding stir head is the key component to realize this process. During the welding process, the temperature of the welding zone has a great influence on the material flow and the performance of the final joint. Therefore, how to measure the temperature of the welding zone and adjust the welding temperature by adjusting the welding process parameters is the key to high-quality welding. [0003] At present, the temperature of the welding zone is often measured by placing a thermocouple in the welding materi...

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Problems solved by technology

[0003] At present, the temperature of the welding zone is often measured by placing a thermocouple in the welding material in advance to measure the temperature of the welding zone. The disadvantages are poor real-time performance and serious hysteresis. It can only be used for experiments and cannot be used in practice. There are also studies using ordinary thermocouples on the stirring head. The disadvantage of measuring temperature is that the structure is destroyed, the real-time performance is poor, and at the same time, it wears out quickly and cannot work for a long time. With the continuous development of local temperature measurement technology, it has developed from ordinary thermocouple temperature measurement to thin-film thermocouple temperature measurement. Thin-film thermocouple It has the advantages of high real-time temperature measurement, accuracy, and non-destructiveness. It is widely used in aerospace engines, cutting processes, and material forming. Therefore, thin-film thermocouples can be used on the friction stir welding stirring head for real-time high-precision and high-dynamic temperature measurement.

[0004] The material of the stirring head is tool steel. To manufacture thin-film thermocouple coatings on the surface of tool steel, problems such as the insulation between the film and the metal substrate, the bonding stress between the film and the surface, the wear resistance and high temperature resistance of the thin-film thermocouple must be solved. The current coating method Only consider increasing wear resistance, but too thick coating is not conducive to real-time temperature measurement, thus affecting the measurement and service life of thin-film thermocouples

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