Method for preparing amorphous carbon composite coating on surface of hard alloy material and high-speed steel material

Abstract

The invention provides a novel method for preparing an amorphous tetrahedral carbon composite coating on the surface of hard alloy material and high-speed steel material. The method comprises substrate pretreatment, ion cleaning, plating of CrTiAlN intermediate coating, arc discharge and carbon ion deposition. The amorphous tetrahedral carbon film composite coating prepared through the method has the advantages that the bonding strength is high, rigidity is high, the friction coefficient is small, the coating is thin, the toughness is excellent, the coating is very suitable for knives and gauges such as screw taps, reamers, plug gauges and the like having strict requirements on dimensions, the content of SP3 bond structure in the coating is more than or equal to 85 percent, the rigidity is more than or equal to 85GPa, the friction coefficient is less than or equal to 0.15 and the bonding strength between the film and the substrate is more than or equal to 35N; and compared with the DLC prepared through the traditional technology, the friction coefficient is smaller, the rigidity is higher, the service life is improved by more than six times and the coating is very suitable for being selected and used at present.

Description

Technical field: [0001] The invention belongs to the field of surface modification of ion beam materials, in particular to a method for preparing an amorphous tetrahedral carbon composite coating on the surface of hard alloy and high-speed steel materials. Background technique: [0002] At present, the coatings of cutting tools at home and abroad are generally used: TiN, CrN, TiAlN, CrAlN and CrAlTi and other materials, and these materials have different characteristics and have been used in certain applications, but the hardness of these coatings is limited to 15-30GPa. The coefficient is 0.4-2. [0003] Among the tools, taps have different requirements from other tools, such as milling cutters. They are disposable tools with strict requirements on size. If the size of the tool is large, the thread will be large and the screw will be loose. If the size is small, the screw will not enter. go. When the tap taps a blind hole, or viscous materials such as stainless steel, it ...

AI Technical Summary

Problems solved by technology

However, the DLC coating prepared by traditional methods such as magnetron sputtering and electric arc at present, its SP 3 The bond content is generally 30-50%, so the hardness is similar to the above coating, generally less than 30GPa

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