Macroscopic gradient hard alloy conical cylindrical tooth and preparation method thereof

Abstract

The invention discloses a macroscopic gradient hard alloy conical cylindrical tooth and a preparation method of the macroscopic gradient hard alloy conical cylindrical tooth. The method comprises thefollowing steps that a mixture A and a mixture B with different WC particle sizes, the same Co content and different carbon contents are respectively prepared; a die is designed according to the actual shrinkage coefficient, forward pressing is adopted, the mixture B is added into the die for pre-pressing, then the mixture A is added, and the mixtures are pressed into a mixed pressed blank; duringsintering, partial pressure sintering is carried out at the temperature of 1280-1430 DEG C, 20-60mba of argon gas is introduced, during cooling, slow cooling is carried out from 1430 DEG C to1350 DEGC, rapid cooling is carried out from 1350 DEG to 1250 DEG C, natural cooling is carried out from 1250 DEG C to room temperature, and the macroscopic gradient hard alloy conical cylindrical tooth is obtained after being discharged. The surface layer of the macroscopic gradient hard alloy conical cylindrical tooth has high toughness, the core has high hardness and wear resistance, and the service life of the conical cylindrical tooth is prolonged.

Description

technical field [0001] The invention belongs to the technical field of cemented carbide, and in particular relates to a macroscopically gradient cemented carbide tapered column tooth and a preparation method thereof. Use studs. Background technique [0002] Cemented carbide is composed of refractory metal hard compound and binder metal (mainly Co). The traditional cemented carbide has a uniform structure. This kind of cemented carbide with a uniform structure has a contradiction between wear resistance and toughness. That is, low cobalt content means high hardness and wear resistance and low toughness. On the contrary, cobalt content The higher the toughness, the lower the hardness and wear resistance. Under the condition of the same cobalt content, the particle size of tungsten carbide will have a certain influence on the hardness and toughness, and the finer the particle size of tungsten carbide, the higher the hardness. [0003] Cemented carbide mining columns are wide...

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