Preparation process of composite coating layer based on machining tool

A technology for processing cutting tools and composite coatings, which is applied in metal material coating technology, coatings, gaseous chemical plating, etc., can solve the problems of short service life and rough surface of processing tools, and achieve not easy to fall off, good adhesion, even texture effect

Inactive Publication Date: 2018-07-24
上海三朗纳米技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a composite coating preparation process based on processing tools, wh

Method used

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  • Preparation process of composite coating layer based on machining tool
  • Preparation process of composite coating layer based on machining tool
  • Preparation process of composite coating layer based on machining tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A composite coating preparation process based on a processing tool, including processing the internal CVD diamond coating of the processing tool and the ultra-nano-diamond coating on the outer surface of the CVD diamond coating; wherein,

[0021] Machining the internal CVD diamond coating of the tool includes the following steps:

[0022] Step 11: The processing tool is subjected to cleaning pretreatment and cobalt removal pretreatment in sequence, and the processing tool after decobalt pretreatment is cleaned and dried for use; it should be noted that the pre-cleaning treatment refers to the organic Dirt removal. Can be treated with alcohol or acetone. Decobalt pretreatment is to remove the cobalt on the surface of the machined tool to improve the adhesion of the later composite coating. Cobalt removal pretreatment includes alkali etching with inorganic alkali solution for 2-20 minutes, cleaning after alkali etching, and then putting in inorganic acid solution for ac...

Embodiment 2

[0027] A composite coating preparation process based on a processing tool, including processing the internal CVD diamond coating of the processing tool and the ultra-nano-diamond coating on the outer surface of the CVD diamond coating; wherein,

[0028] The processing steps of the CVD diamond coating inside the tool are the same as in Example 1;

[0029] The processing of ultra-nano-diamond coating on the outer surface of CVD diamond coating includes the following steps:

[0030] Step 21: Adjust the pressure in the CVD diamond deposition furnace to -105KPa, keep CH 4 、H 2 The air flow rate ratio remains unchanged, and then Ar is introduced into the CVD diamond deposition furnace, and the Ar air flow rate is linearly increased to 1000sccm, and the linear increase time is 60min, and the CH 4 、H 2 , The gas flow rate ratio of Ar is 1:200:200, the pressure in the CVD diamond deposition furnace is maintained at -100.5KPa, the temperature of the surface of the processed tool is c...

Embodiment 3

[0032] A composite coating preparation process based on a processing tool, including processing the internal CVD diamond coating of the processing tool and the ultra-nano-diamond coating on the outer surface of the CVD diamond coating; wherein,

[0033] The processing steps of the CVD diamond coating inside the tool are the same as in Example 1;

[0034] The processing of ultra-nano-diamond coating on the outer surface of CVD diamond coating includes the following steps:

[0035] Step 21: Adjust the pressure in the CVD diamond deposition furnace to -100.5KPa, keep CH 4 、H 2 The air flow rate ratio remains unchanged, and then Ar is introduced into the CVD diamond deposition furnace, and the Ar air flow rate is linearly increased to 1000sccm, and the linear increase time is 90min, and the CH 4 、H 2 , The gas flow rate ratio of Ar is 1:200:200, the pressure in the CVD diamond deposition furnace is maintained at -100.5KPa, the temperature of the tool surface is controlled to be 6...

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Abstract

The invention discloses a preparation process of a composite coating layer based on a machining tool. The preparation process comprises the following steps of: pretreating the machining tool, then drying, placing into a diamond deposition furnace, performing vacuum pumping in the furnace, adjusting gas-flow speed ratio of CH4 and H2 and the pressure in the furnace, heating hot filaments, adjustingthe surface temperature of the machining tool, and after depositing, forming a diamond coating layer; readjusting the pressure in the furnace, introducing Ar, gradually increasing the gas-flow speedratio of Ar, maintaining certain pressure in the diamond deposition furnace, and maintaining reaction for a period of time. The preparation process of the composite coating layer disclosed by the invention has the beneficial effects that the surface hardness and the wear resistance of the machining tool of the original diamond coating layer can be ensured, and simultaneously, due to flat and smooth surface of the ultranano diamond coating layer, the surface finishment of a mold machined by the machining tool is better.

Description

technical field [0001] The invention belongs to the technical field of manufacturing cutting tools, and in particular relates to a preparation process of a composite coating based on cutting tools. Background technique [0002] Diamond-coated tools usually deposit a layer of diamond film directly on cemented carbide (K-type cemented carbide) or ceramics by CVD method, and are mainly used for turning various non-ferrous metals such as aluminum, copper, magnesium and their alloys, Cemented carbide and non-metallic materials such as fiber plasticized materials with strong wear resistance, metal matrix composite materials, and wood. However, the surface quality of diamond-coated tools is rough. Currently, existing diamond-coated tools are used to process molds with high surface finish requirements, such as 3D glass molds for mobile phones. [0003] The ultra-nano-diamond coating refers to an adhesive diamond film with a grain size smaller than 40nm in the film layer. Compared...

Claims

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Application Information

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IPC IPC(8): C23C16/27C23C16/455
CPCC23C16/271C23C16/45523
Inventor 姚勇
Owner 上海三朗纳米技术有限公司
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