Electromagnetic ultrasonic brazing method for SiC ceramic

Abstract

The invention relates to an electromagnetic ultrasonic brazing method for SiC ceramic, the method comprises the following operation steps: the width of a brazing filler metal foil sheet is processed to be completely consistent with the width and size of the SiC ceramic; the surface of the brazing filler metal foil sheet and the surface of the SiC ceramic are ground and cleaned; the treated brazingfiller metal foil sheet is filled between two to-be-welded surfaces of the SiC ceramic, two pieces of the SiC ceramic are horizontally placed side by side, another brazing filler metal foil sheet ishorizontally placed on the upper edges of the two to-be-welded surfaces, then is placed in a muffle furnace, and is then arranged in a static magnetic field in the vertical direction after being heated, a permanent magnet and a coil are positioned right above the horizontally-placed brazing filler metal foil sheet, the static magnetic field is generated by a superconducting magnet, current is introduced into the two ends of the brazing filler metal foil sheet, meanwhile, pressure is applied to the two ends of the SiC ceramic, the SiC ceramic is cooled to the room temperature along with the furnace, and the brazing of the SiC ceramic is completed. The electromagnetic ultrasonic method is adopted, no ultrasonic tool head is arranged, and the SiC ceramic cannot be directly contacted during ultrasonic application, so that the SiC ceramic cannot be subjected to ultrasonic vibration so as to cause cracking.

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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