▎ 摘　　要

NOVELTY - Brazing carbon-based materials and nickel-based superalloys comprises grinding the surface of the carbon-based material to be welded to obtain a dry carbon-based material. 2.5-15% chromium powder and 97.5-85% tin powder are ball milled and mixed to obtain tin-chromium mixed powder, and mixing the mixed powder and binder to form a metal paste, which is coated on the carbon base surface of the material to be welded. The carbon-based material coated with the metal paste is put into a vacuum furnace at 800-1050℃ to obtain carbon-based material. The heat-treated carbon-based material is put into nitric acid solution for corrosion treatment to obtain a carbon-based material with a chromium carbide layer. The carbon-based material with a chromium carbide layer is put into an anhydrous ethanol solution for ultrasonic cleaning and dried to obtain a carbon-based material with surface-modified chromium carbide. USE - Method for brazing carbon-based materials and nickel-based superalloys with high-temperature copper-palladium-tungsten low thermal expansion coefficient composite solder. ADVANTAGE - The method prepares chromium carbide on the surface of the carbon-based material, realizes the wetting of the non-active solder on the surface of the carbon-based material, forms a high-temperature-resistant and high-plastic structure in the brazing seam, and has high joint strength, and the service temperature can exceed 1000℃. DETAILED DESCRIPTION - Brazing carbon-based materials and nickel-based superalloys comprises grinding the surface of the carbon-based material to be welded to obtain a dry carbon-based material. 2.5-15% chromium powder and 97.5-85% tin powder are ball milled and mixed to obtain tin-chromium mixed powder, and mixing the mixed powder and binder to form a metal paste, which is coated on the carbon base surface of the material to be welded. The carbon-based material coated with the metal paste is put into a vacuum furnace at 800-1050℃ to obtain carbon-based material. The heat-treated carbon-based material is put into nitric acid solution for corrosion treatment to obtain a carbon-based material with a chromium carbide layer. The carbon-based material with a chromium carbide layer is put into an anhydrous ethanol solution for ultrasonic cleaning and dried to obtain a carbon-based material with surface-modified chromium carbide. The surface of the nickel-based superalloy is ground and cleaned and dried ultrasonically to obtain a dry nickel-based superalloy. The copper-palladium-tungsten solder foil is placed between the surface to be welded of the chromium carbide modified carbon-based material and the surface to be welded of the nickel-based superalloy to obtain the piece to be welded, put the piece to be welded into a vacuum furnace, evacuated to 1150-1250℃ to obtain connectors, and then cooled down to room temperature to complete the brazing of carbon-based materials and nickel-based superalloys.