▎ 摘　　要

NOVELTY - Gradient hard alloy cutter material added with graphene, comprises gradient layer which further comprises 5 symmetrical layers. The content of the hard-phase sub micron tungsten carbide is reduced, and the nano titanium carbide hard phase content is increased. The content of graphene, nano-vanadium carbide, nano crystalline chromium carbide and nano crystalline silicon carbide have three types of settings. USE - Gradient hard alloy cutter material added with graphene. ADVANTAGE - The gradient hard alloy cutter material has excellent heat-conducting property, excellent friction performance, and is especially suitable for metal of intermittent turning and milling. The material is prepared in a simple, convenient operation manner that has small device investment and high material utilization rate, easy for industrial production. DETAILED DESCRIPTION - Gradient hard alloy cutter material added with graphene, comprises gradient layer which further comprises 5 symmetrical layers. The content of the hard-phase sub micron tungsten carbide is reduced, and the nano titanium carbide hard phase content is increased. The content of graphene, nano-vanadium carbide, nano crystalline chromium carbide and nano crystalline silicon carbide have three types of settings. The content of graphene increases from the surface to the inside of the graphene without any addition of vanadium carbide and chromium carbide and silicon carbide whiskers. The transition layer contains graphene. The surface layer and the core layer contains a compound grain growth inhibitor of vanadium carbide and chromium carbide ratio of 2:1. The surface contains compound grain growth inhibitor of vanadium carbide and chromium carbide ratio of 2:1. The mass ratio of tungsten carbide, titanium carbide, vanadium carbide, chromium carbide and silicon carbide is 90.8-91.95:3-5:0.05-0.1:0-0.8:0-0.4. The tungsten carbide powder has an average particle carbide size of 100-400 nanometer, titanium carbide powder has an average particle carbide size of 50-100 nanometer, cobalt powder has an average particle carbide size of 100-500 nanometer, graphene layers of 1-40 layers, vanadium carbide powder has an average particle carbide size of 50-100 nanometer, chromium carbide powder average particle carbide size of 50-100 nanometer, silicon carbide whisker diameter /~ 300 nanometer, and aspect ratio of /- 10. An INDEPENDENT CLAIM is included for a method for preparing gradient hard alloy cutter material, which involves: (A) pressing the surface layer ingredients and dispersing graphene and cemented carbide powder in organic solvent that is selected from anhydrous ethanol, N-methyl-2-pyrrolidone and N, N-dimethylformamide as a dispersing solvent; (B) adding 10-100 wt.% of surfactant to polyvinyl pyrrolidone, sodium dodecyl benzene sulfonate to obtain graphene suspension; (C) heating the suspension at 100 degrees C in water bath and ultrasonically dispersing for 10-30minutes; (D) adding the nano-titanium carbide particle carbides and heating at 100 degrees C for 10-30minutes; (E) adding nano vanadium carbide, nano chromium carbide, nano silicon carbide and the nano-titanium carbide dispersion and mixing at 100 degrees C for 10-30minutes to obtain a hard metal powder suspension; (F) adding graphene suspension dropwise to the hard alloy powder suspension under vigorous stirring for 10-30minutes; (G) subjecting to ball milling 10-30 hours, and then drying in a vacuum oven, sieving to obtain good dispersion graphene hard metal powder; (H) charging and sintering according to the size of the mold and the thickness of the gradient layer; and (I) subjecting to hot pressing sintering, at the pressure of 15megaPascals and raising the temperature to 1350-1450 degrees C at 60 degrees C/minute and then cooling to obtain the product.