Superhard DLC cutter coating of amorphous gradient structure, preparation method of superhard DLC cutter coating and cutter

A gradient structure and gradient layer technology, which is applied in coating, metal material coating process, ion implantation plating, etc., can solve the problems that the strength of cemented carbide coating tools cannot meet the use requirements, and the price of diamond tools is expensive. Achieve good thermal stability and chemical stability, good thermal conductivity and hardness, and high film-base bonding strength

Pending Publication Date: 2021-12-31
美戈利浙江轨道交通研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the existing diamond cutting tools are expensive, and the strength of the improved hard alloy coating cutting tools cannot meet the requirements for use

Method used

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  • Superhard DLC cutter coating of amorphous gradient structure, preparation method of superhard DLC cutter coating and cutter
  • Superhard DLC cutter coating of amorphous gradient structure, preparation method of superhard DLC cutter coating and cutter
  • Superhard DLC cutter coating of amorphous gradient structure, preparation method of superhard DLC cutter coating and cutter

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Embodiment 1

[0032] Embodiment 1: This embodiment provides a superhard DLC tool coating with an amorphous gradient structure, and a coating with a thickness of 2.5 μm is deposited on the collective tool by PVD deposition. The tool matrix composition is 92 parts of WC powder and 8 parts of Co. The coating consists of a pure Cr transition layer, a Cr / C transition layer, DLC (sp 3 gradient layer), the pure Cr transition layer is about 100nm thick, the Cr / C transition layer is about 200nm thick, and the DLC (sp3 gradient layer) is 2.2μm thick. The composition of the Cr / C transition layer is in parts by weight, from 100 parts of Cr to 50 parts, and from 0 parts of C to 50 parts. In the DLC, sp 3 The content is gradually reduced from 75 parts to 40 parts.

Embodiment 2

[0033] Embodiment 2: This embodiment provides an amorphous gradient structure superhard DLC tool coating, and a 2.08 μm thick coating is deposited on the tool collective by PVD deposition. The tool matrix is ​​sintered from 92 parts of WC powder and 8 parts of Co. The coating consists of a pure Cr transition layer, a Cr / C transition layer, DLC (sp 3 Gradient layer), the pure Cr transition layer is about 150nm thick, the Cr / C transition layer is about 230nm thick, and the DLC (sp3 gradient layer) is 1.7μm thick. The composition of the Cr / C transition layer is by weight, changing from 100 parts to 50 parts of Cr, and increasing C from 0 parts to 50 parts, and the DLC (sp 3 gradient layer) by sp 3 The content gradually reduces the deposition composition from the transition layer to the surface, in parts by weight, in the DLC, sp 3Content gradually reduces to 48 parts of surface layer by 78 parts.

Embodiment 3

[0034] Embodiment 3: This embodiment provides an amorphous gradient structure superhard DLC tool coating, and a 2.7 μm thick coating is deposited on the tool collective by PVD deposition. The tool matrix is ​​sintered from 92 parts of WC powder and 8 parts of Co. The coating consists of a pure Cr transition layer, a Cr / C transition layer, DLC (sp 3 Gradient layer) composition, the thickness of the pure Cr transition layer is about 100nm, the thickness of the Cr / C transition layer is about 200nm, and the thickness of DLC (sp3 gradient layer) is 2.4μm. The composition of the Cr / C transition layer is in parts by weight, from 100 parts of Cr to 50 parts, and from 0 parts of C to 50 parts. In the DLC, sp 3 The content is gradually reduced from 75 parts to 40 parts.

[0035] This invention also provides a preparation method of the superhard DLC tool coating with an amorphous gradient structure, which is carried out according to the following steps;

[0036] S1. Pretreatment: Sand...

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Abstract

The invention relates to the technical field of superhard coatings, and discloses a superhard DLC cutter coating of an amorphous gradient structure, a preparation method of the superhard DLC cutter coating and a cutter. The cutter coating comprises a transition layer and a DLC (sp3 gradient layer) which are sequentially deposited on a cutter base material layer by layer, the transition layer contains Cr and C elements, the contents of the Cr and C elements are set in a gradient manner, and sp3 gradient setting is achieved in the DLC. The internal stress of the DLC (sp3 gradient layer) is relatively low, toughness is enhanced, a crack arrest effect is achieved, and meanwhile the coating has high hardness, reaches the hardness value of a superhard coating and has relatively good thermal stability and chemical stability; the Cr/C gradient transition layer effectively enhances the bonding strength of pure Cr of the transition layer and the DLC of the upper layer, the structure is of a nano composite structure with nanocrystalline CrC wrapped by amorphous C, and the toughness of the coating is greatly improved while the hardness is improved; and due to the existence of the pure Cr transition layer serving as the bonding layer and the Cr/C transition layer, the film-substrate bonding strength of the coating is high, and the coating is not prone to peeling off in the machining process.

Description

technical field [0001] The invention relates to the technical field of cutting tool superhard coating materials, in particular to an amorphous gradient structure superhard DLC cutting tool coating, a preparation method thereof and cutting tools. Background technique [0002] Titanium and titanium alloys have the advantages of high specific strength, good corrosion resistance, high thermal strength and good biocompatibility, and are widely used in the fields of aerospace, biomedicine and marine ships, and are known as "space metals", "all-round Metal", "Ocean Metal". [0003] But the machining of titanium alloy is difficult to realize. Its elastic modulus is small, only 1 / 2 of steel, its rigidity is poor, and it is easy to deform, and its thermal conductivity is small (7.955W / (mK)), which is only 1 / 5 of steel. During cutting, the heat accumulated inside the TC4 cannot be dissipated to the outside, causing the blade to bear a large amount of heat, and the temperature rises r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/06C23C14/16C23C14/34B22F5/00B22F3/24C22C29/08
CPCC23C14/0605C23C14/165C23C14/06C23C14/345C23C14/3464C23C14/3492B22F5/00B22F3/24C22C29/08B22F2005/001B22F2003/242
Inventor 陈辉王丽君刘艳王梦超胡登文陈红杰史娇范晓海
Owner 美戈利浙江轨道交通研究院有限公司
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