Micro-nano composite diamond coating, preparation method and application thereof, cold extrusion die punch and die

A composite diamond and micro-diamond technology, which is applied in the field of diamond coating preparation, can solve the problems of diamond coating film-base bonding strength, diamond coating surface roughness, extrusion die punch die wear, and restrict cold extrusion. Problems such as pressure application range, to improve surface finish, ease wear and tear, and facilitate precision machining

Pending Publication Date: 2019-11-19
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, diamond coatings have been used in wire drawing dies. For example, patent CN 102586756A discloses a microporous diamond coating device and coating preparation method for wire drawing dies. Patent CN 101280423A discloses a preparation of small-diameter diamond-coated wire drawing dies. Method, the patent CN 101280422A discloses a batch preparation device for diamond-coated wire drawing dies. These are all deposited and grown diamond coatings on the surface of the inner hole of the wire-drawing die. Although the problem of mass production is solved, the film of the diamond coating- Bonding strength of substrate and surface roughness of diamond coating
[0004] On the other hand, the failure of the extrusion die punch is often due to the severe wear of the die after multiple extrusions, which makes it unable to meet the processing accuracy and thus scrapped. Improving the life of the extrusion die punch is the key to reducing the cost of extrusion parts
In addition, there is a lot of friction between the punch and the workpiece during the cold extrusion process. Although lubricants are used in the working process, which can meet the forming requirements of general parts, there will still be some high-precision forming. Certain problems, which restrict the scope of application of cold extrusion to a certain extent
At present, diamond coating is rarely used on cold extrusion dies

Method used

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  • Micro-nano composite diamond coating, preparation method and application thereof, cold extrusion die punch and die

Examples

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preparation example Construction

[0054] According to a second aspect of the present invention, a method for preparing the above-mentioned micro-nano composite diamond coating is provided, comprising the following steps:

[0055] A micro-diamond coating and a nano-diamond coating are sequentially deposited on the substrate surface by a hot wire vapor deposition method to obtain a micro-nano composite diamond coating.

[0056] Hot wire chemical vapor deposition (hot wire CVD) is one of the chemical vapor deposition methods. This method is mainly to thermally decompose hydrocarbon gas to produce SP which is necessary for synthetic diamond. 3 A group of carbon atoms that hybridize orbitals.

[0057] The method of hot wire chemical vapor deposition is not limited, and conventional hot wire chemical vapor deposition devices and / or processes can be used, and it can be a common hot wire method, or other improved hot wire methods such as electronic assistance.

[0058] The step of sequentially depositing and growing ...

Embodiment 1

[0100] Example 1 The preparation of the micro-nano composite diamond coating of the cold extrusion die punch of the cylindrical part

[0101] The cold extrusion die punch of the cylindrical part is used as the substrate, and the micro-nano composite diamond coating is prepared thereon, comprising the following steps:

[0102] (1) Carry out white corundum wet sandblasting treatment on the punch, the sandblasting pressure is 400kPa, and the sand particle size is 800 mesh; then the punch is ultrasonically cleaned in acetone and alcohol for 30 minutes;

[0103] (2) The micro-diamond coating is prepared by the hot wire chemical vapor deposition method, with hydrogen and methane as reaction gases, and the micro-diamond coating is deposited on the surface of the extrusion die punch after pretreatment. The deposition conditions include: the methane gas flow rate is 20 sccm , the flow rate of hydrogen gas is 1000sccm, the air pressure in the vacuum chamber is kept at 4kPa, the distance...

Embodiment 2

[0106] Example 2: Preparation of Micro-nano Composite Diamond Coating for Cold Extrusion Die Punch of Cylindrical Part

[0107] The cold extrusion die punch of the cylindrical part is used as the substrate, and the micro-nano composite diamond coating is prepared thereon, comprising the following steps:

[0108] (1) Carry out white corundum wet sandblasting treatment on the punch, the sandblasting pressure is 300kPa, and the sand particle size is 900 mesh; then the punch is ultrasonically cleaned in acetone and alcohol for 25 minutes;

[0109] (2) The micro-diamond coating is prepared by hot-wire chemical vapor deposition, with hydrogen and methane as reaction gases, and the micro-diamond coating is deposited on the surface of the extrusion die punch after pretreatment. The deposition conditions include: the methane gas flow rate is 25 sccm , the flow rate of hydrogen gas is 1000sccm, the air pressure in the vacuum chamber is kept at 2kPa, the distance between the heating wire...

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Abstract

The invention discloses a micro-nano composite diamond coating, a preparation method and application thereof, a cold extrusion die punch and the die, and relates to the technical field of diamond coating preparation. The micro-nano composite diamond coating sequentially comprises (a) a micron diamond coating in contact with a substrate and (b) a nano diamond coating. The preparation method of themicro-nano composite diamond coating includes the step that a hot-wire vapor deposition method is used for sequentially depositing the micron diamond coating and the nano diamond coating on the surface of the substrate. The invention also provides the application of the micro-nano composite diamond coating to the cold extrusion die, the cold extrusion die punch and the die. The micro-nano composite diamond coating is applied to the cold extrusion die punch, the service life of the extrusion die punch is prolonged, the cost is reduced, the friction between the punch and a workpiece is reduced,the forming extrusion force is reduced, and the surface smoothness of the workpiece is improved.

Description

technical field [0001] The invention relates to the technical field of diamond coating preparation, in particular to a micro-nano composite diamond coating, a preparation method and application thereof, a cold extrusion die punch and a die. Background technique [0002] Because diamond has the characteristics of high hardness, good thermal conductivity, low friction, super wear resistance and stable structure, diamond coating has been widely used in the fields of cutting tools, parts and molds. [0003] At present, diamond coatings have been used in wire drawing dies. For example, patent CN 102586756A discloses a microporous diamond coating device and coating preparation method for wire drawing dies. Patent CN 101280423A discloses a preparation of small-diameter diamond-coated wire drawing dies. Method, the patent CN 101280422A discloses a batch preparation device for diamond coating wire drawing dies. These are all deposited and grown diamond coatings on the surface of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/27C23C16/02
CPCC23C16/271C23C16/0254C23C16/0227
Inventor 唐永炳陈波张松权王陶
Owner SHENZHEN INST OF ADVANCED TECH
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