Composite diamond coating hard alloy cutter mold and preparation method thereof

Abstract

The invention discloses a composite diamond coating hard alloy cutter mold and a preparation method thereof. The surface layer of the hard alloy cutter mold is provided with composite coatings composed of boron-doped or non-boron-doped micron-crystal diamonds and nanocrystalline diamonds which are alternately arranged, and a layer of diamond-like coating DLC is deposited on the surface of each composite diamond coating. The preparation method comprises the steps of oil removal and degreasing, chemical micro-etching, plasma activation, plasma enhanced gaseous boronizing, plasma cleaning, diamond slurry ultrasonic grinding, nano-scale and micron-diamond seed crystal planting, and vapor-phase deposition of the diamond composite coatings. According to the method, boron atoms enter diamond crystal lattices by doping boron in the diamond deposition process, the internal stress of the diamond coatings is adjusted, and the generation of a stress sudden change region is avoided, so that the situation that the stress of each layer is not matched is avoided fundamentally, the stress distribution inside the composite coatings is effectively improved, the integrity of the micro-nano composite coatings is further improved, the substrate-film binding force is improved, and the comprehensive mechanical property of the composite coatings is improved.

Description

technical field [0001] The invention discloses a composite diamond-coated hard alloy cutter mold and a preparation method thereof, belonging to the technical field of hard alloy surface treatment. Background technique [0002] With the rapid development of industry, lightweight and high-strength materials have gradually become the mainstream, and new materials such as non-ferrous metals and alloys, glass fiber reinforced plastics, graphite and ceramics are widely used in industry. The machining of these new materials has also put forward higher and higher requirements, and ordinary high-speed steel and hard alloy cutting tools have been difficult to meet. Due to its high hardness, high thermal conductivity, low friction coefficient and low thermal expansion coefficient, diamond coating has become an ideal tool coating material for the cutting of the above-mentioned difficult-to-machine materials. Its research and development and application have attracted extensive attention...

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Problems solved by technology

In addition, since the stress of microcrystalline diamond is mainly compressive stress, and the stress of nanocrystalline diamond is mainly tensile stress, the stress difference between the two will affect the bonding force and mechanical properties of the film; the composite film is a multilayer film Composition, the residual stress between each layer will affect the final performance of the composite film, for example, when the residual stress gap between two adjacent layers is huge, the transition layer in the middle of the two layers will become a stress mutation region, which is prone to fracture , thereby reducing the bonding force of the composite coating

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