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Ultra-fine cemented carbide tool and method for preparing surface nano-composite film thereof

A cemented carbide and nano-composite technology, applied in the direction of metal material coating process, coating, layered products, etc., can solve the problem that the comprehensive performance of cemented carbide cannot be further improved, the friction coefficient is difficult to be lower than 0.1, and it is not suitable for super Surface modification of fine-grained cemented carbide tools, etc., to achieve the effects of improving processing quality and tool life, reducing production costs, high wear resistance and high temperature performance

Inactive Publication Date: 2012-07-04
CHANGZHOU INST OF DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the problem is that in the existing traditional hard film layers, such as TiN, ZrN, TiAlN, TiCN, etc., because their hardness is generally around 20-24GPa, and the friction coefficient is more than 0.2, that is, with Compared with the substrate, the performance of the coating itself does not have much advantage, so depositing these layers on the surface of the ultra-fine-grained cemented carbide will not only fail to further improve the comprehensive performance of the cemented carbide, but sometimes have the opposite effect
In addition, although the hardness of some multi-component composite films and nano-multilayer films is very high, which can reach more than 35GPa, the friction coefficient determined by factors such as chemical inertness is difficult to be lower than 0.1, so it is not suitable for ultra-fine grain Films for Surface Modification of Cemented Carbide Tools

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] After cleaning and drying the ultra-fine-grained carbide micro-drills, they are placed on the loading jig of the vacuum chamber of the arc ion plating equipment, and a part of the pure graphite target and a part of the pure zirconium target are installed on the position of the cathode arc source. Vacuum to 5×10-3Pa, pass argon gas to 1.0Pa, apply -800V×20kHz×40% pulse bias to trigger glow plasma, and use the ions in the plasma to clean the micro-drill by sputtering for 10 minutes ; Then reduce the bias voltage amplitude to -300V, reduce the argon pressure to 0.8Pa, start the graphite target and zirconium target cathode arc, the graphite target arc flow is 50A, the zirconium target arc flow is 80A, and then feed nitrogen, the nitrogen partial pressure is 0.5Pa, start to deposit DLC diamond-like carbon film doped with zirconium nitride nanocrystals, and the time is 40 minutes; after that time, unload the bias voltage, stop the arc, stop the gas, keep the vacuum for furnace...

Embodiment 2

[0021] Place the Φ100×50mm ultra-fine-grained cemented carbide extrusion die with an inner hole diameter of 50 mm on the loading jig in the vacuum chamber of the arc ion plating equipment after pretreatment such as cleaning and drying, and install it partly at the position of the cathode arc source Pure graphite target, part of which is installed with pure zirconium target, vacuumed to 5×10 -3 Pa, pass argon gas to 1.0Pa, add a pulse bias voltage of -800V×20kHz×40% to trigger glow plasma, and use the ions in the plasma to clean the mold by sputtering for 10 minutes; then reduce the bias voltage amplitude to -500V, reduce the argon pressure to 0.8Pa, start the cathode arc of graphite target and zirconium target, the arc flow of graphite target is 40A, the arc flow of zirconium target is 100A, then pass nitrogen gas, the partial pressure of nitrogen gas is 0.6Pa, start to deposit doped with Zirconium nitride nanocrystalline DLC diamond-like film, the time is 60 minutes; when the...

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Abstract

The invention discloses an ultra-fine cemented carbide tool and a method for preparing a surface nano-composite film thereof, belonging to the field of metal material and machining technology. The invention is characterized by providing an ultra-fine cemented carbide tool surface-modified by the nano-composite film, wherein the film is a zirconium nitride nanocrystalline-doped diamond-like film prepared by using an arc iron plating method and forms a high-performance tool system with an ultra-fine grain WC-Co cemented carbide micro-drill with the WC grain of 0.1-0.3 microns, a printing needlehead, a milling cutter, a mould and other tool base materials. The method has the advantages of: causing the ultra-fine cemented carbide tool to have the surface hardness higher than 40GPa and the thermal stability higher than 500 DEG C, the frictional coefficient lower than 0.1 and being capable of remarkably enhancing the machining quality and the service life of the tool. The tool and the method are particularly suitable for the technical field of fine machining of machining.

Description

technical field [0001] The invention belongs to the technical field of metal materials and mechanical processing, and relates to an ultrafine-grained hard alloy tool and a method for preparing a nanocomposite film on its surface. Background technique [0002] Since the Multi-Arc Company and Vac-Tech Company in the United States successfully applied TiN film to the surface coating of the tool in the 1980s, the tool hard coating technology has gone through nearly 30 years. During this period, in order to continuously meet the needs of the machining industry towards higher speed and continuous production and use under harsher conditions, the tool base material gradually transitioned from the initial low alloy tool steel and high speed tool steel to hard alloy , and to adapt to this, the hard film material has also transitioned from the first generation of TiN to the second generation of TiCN, TiAlN, etc., and finally developed to today's various multi-component composite films ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B9/04C23C14/32
Inventor 林国强李红凯
Owner CHANGZHOU INST OF DALIAN UNIV OF TECH
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