A kind of electromagnetic ultrasonic brazing method for sic ceramics

Abstract

The invention relates to an electromagnetic ultrasonic brazing method for SiC ceramics, comprising: processing the width of the brazing material foil to be completely consistent with the width and size of the SiC ceramics; grinding and cleaning the surfaces of the brazing material foil and the SiC ceramics; Fill the processed solder foil between the two surfaces to be welded of SiC ceramics, place the two SiC ceramics horizontally side by side, place another piece of solder foil horizontally on the upper edges of the two surfaces to be welded, And put it in the muffle furnace, after heating up, then set it in the static magnetic field in the vertical direction, the permanent magnet and the coil are located directly above the solder foil placed horizontally, the static magnetic field is generated by the superconducting magnet, in the solder foil Current is applied to both ends, and pressure is applied to both ends of SiC ceramics at the same time, and the SiC ceramics are brazed after being cooled to room temperature with the furnace. The present invention adopts the electromagnetic ultrasonic method, without the ultrasonic tool head, and the ultrasonic application does not directly contact the SiC ceramics, so the SiC ceramics will not be cracked by ultrasonic vibration.

Description

Technical field:

[0001] The invention relates to the field of SiC ceramic welding, in particular to an electromagnetic ultrasonic brazing method for SiC ceramics. Background technique:

[0002] Due to its small thermal expansion coefficient, good wear resistance, and stable chemical properties, SiC ceramics have been widely used in aviation, aerospace, petroleum, and chemical industries. The sintering technology for preparing SiC ceramic materials has also become mature, but the yield of complex and large components for preparing SiC ceramics is still very low. Therefore, the industry often adopts the method of welding small-sized SiC ceramics to form large components.

[0003] Brazing is a potential technology to realize the connection of small-sized SiC ceramics. One of the main problems in the brazing connection process of SiC ceramics is the problem of interfacial wetting and bonding. The physical and chemical properties of SiC ceramics and metal solders are very differ...

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