Binding-phase-free WC-based hard alloy cutter material and preparation method thereof

Abstract

The invention discloses a binding-phase-free WC-based hard alloy cutter material and a preparation method thereof. According to the invention, tungsten carbide is used as a base material; nano complexphase ceramic doping is adopted, and the effects of defect reinforced sintering and liquid-phase reinforced sintering are synergistically exerted; meanwhile, two-dimensional graphene nanosheets and one-dimensional carbon nanotubes are hybridized to serve as a synergistic strengthening and toughening phase and a densification phase of the binding-phase-free WC-based hard alloy cutter material; thegraphene is loaded with carbon nanotube, the graphene is supported by the carbon nanotubes; a three-dimensional strengthening and toughening and rapid heat conduction network is constructed; dispersing agents which enable the two components to be mutually dispersed; a contact area of the graphene-carbon nano tube and a cutter material matrix is increased, and a graphene and carbon nano tube synergistic toughening mechanism and a synergistic heat conduction mechanism are formed in the aspect of function, so that the bending strength, Vickers hardness and fracture toughness mechanical properties of the obtained binding-phase-free WC-based hard alloy cutter material are greatly improved. The adopted graphene-carbon nanotube three-dimensional space structure has a high heat conduction coefficient, and the heat dissipation capacity of the cutter is greatly improved.

Description

technical field

[0001] The invention belongs to the technical field of cutting tool materials, and in particular relates to a WC-based cemented carbide cutting tool material without a binder phase and a preparation method thereof. Background technique

[0002] As one of the most important common technologies in advanced manufacturing technology, high-speed cutting technology is an important guarantee for improving the quality of parts and processing efficiency. Among them, high-speed cutting tool technology is the most critical core element in high-speed cutting. The research and development is suitable for high-efficiency, High-quality machined tool materials are one of the basic prerequisites for giving full play to the effectiveness of high-speed cutting. At present, the tool materials used for high-speed cutting mainly include: diamond, cubic boron nitride, ceramics, hard alloy and high-speed steel. The hardness of cemented carbide is slightly lower than diamond, cubic ...