Alc/alcn Laminated Coated Cutting Tool and Its Preparation Technology

Abstract

The invention belongs to the field of mechanical manufacturing of cutting tools, and particularly relates to an AlC / AlCN laminated coated tool and a preparation process thereof. The AlC / AlCN laminated coated tool is prepared through the composite coating method combining unbalanced magnetron sputtering and arc ion plating. An AlCN coating is arranged on the surface of a tool base body, a Ti transition layer is arranged between the AlCN coating and the tool base body, and a composite laminated coating structure formed by an AlC coating and an AlCN coating alternately is located between the AlCN coating and the Ti transition layer. According to the preparation process, the deposition temperature is controlled to be 300 DEG C or below, and the coatings can be prepared on diversified tool base bodies. The prepared AlC / AlCN laminated coated tool integrates the advantages of the AlC coating and the AlCN coating and has more excellent chemical stability and high-temperature oxidation resistance, frictional wear performance of the coated tool can be remarkably improved, the cutting life of the tool is prolonged, and machining efficiency of the tool is improved; and meanwhile, an interlayer interface of the laminated composite structure can prevent growth of coating columnar crystals, hinder extension of cracks and defects, and improve the hardness, toughness and impact resistance of the coatings.

Description

technical field [0001] The invention belongs to the field of machine-made metal cutting tools, and in particular relates to an AlC / AlCN laminated coating tool and a preparation process thereof. Background technique [0002] Coating the tool is one of the important ways to improve the performance of the tool. Coated tools combine the tool substrate with a hard coating, which greatly improves the performance of the tool. TiC and TiN coatings are the earliest coatings applied on the tool surface. However, with the development of cutting technology and the promotion of high-speed cutting technology, the relatively weak toughness and wear resistance of binary nitride hard coatings limit its application. The literature (ActaMaterials.2011,59(1):68-74) reported the mechanism and performance of TiN hard coating tools during cutting, but the use of this hard coating is limited due to its relatively high coefficient of friction. . The comprehensive properties of toughness, strengt...

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Problems solved by technology

However, TiCN coating has the disadvantage of poor thermal stability, the coating hardness decreases too fast at high temperature (poor red hardness) and the friction coefficient increases, which limits its popularization and application in high-speed cutting and green dry cutting.

[0003] At present, carbon and nitrogen compounds such as TiCN are mainly prepared by techniques such as chemical vapor deposition (CVD), that is, through TiCl 4 (or Ti target), CH 4 (or C 2 h 2 ) and N 2 The deposition temperature usually exceeds 400°C, which has an adverse effect on the substrate. At the same time, the gas carbon source is easy to pollute the coating equipment, which restricts its wide application.

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