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PCBN cutter with nano diamond film coating on surface and preparation method of PCBN cutter

A nano-diamond and thin-film technology, which is applied in metal material coating process, coating, gaseous chemical plating, etc., can solve the problems of coarse grain size of micro-diamond film, affecting the service life of coating tools, and affecting the quality of diamond film. Achieve the effect of industrial application, good film coating quality and smooth surface

Pending Publication Date: 2021-09-17
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the grains of the micron diamond film are coarse and uneven, and the surface of the coating is relatively rough, which makes it difficult to perform surface polishing. At the same time, it will cause greater wear and higher cutting force when the tool contacts the workpiece, which will seriously affect the coating. tool life
[0004] CN105861995A discloses a ZrTiN-MoS 2 / Ti / Zr laminated coating tool and its preparation process, the base material of the tool is high-speed steel, hard alloy, cubic boron nitride or diamond, and the surface of the tool is MoS 2 / Ti / Zr lubricating coating, and from the substrate to the coating surface are Ti transition layer, Ti / Zr transition layer, ZrTiN hard coating and MoS 2 / Ti / Zr lubricating coating alternate laminated composite structure; the tool coating is more, and it is prepared by arc plating and intermediate frequency magnetron sputtering composite coating method, the process is more complicated and the cost is higher
[0005] CN106637143A discloses a kind of preparation method of MPCVD diamond thin film, and this method adopts inert gas Ar as the catalytic gas in deposition process, to play the crystal grain refinement of diamond thin film, improve the hardness of diamond thin film, improve the effect of diamond thin film quality; However, the inert gas Ar will reduce the hydrogen concentration, resulting in not enough active hydrogen atoms to etch it, resulting in an increase in non-diamond phase components and affecting the quality of the diamond film

Method used

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  • PCBN cutter with nano diamond film coating on surface and preparation method of PCBN cutter
  • PCBN cutter with nano diamond film coating on surface and preparation method of PCBN cutter
  • PCBN cutter with nano diamond film coating on surface and preparation method of PCBN cutter

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Embodiment 1

[0056] This embodiment provides a method for preparing a tool with a nano-diamond film coating on the surface, the process flow diagram of the preparation method is as follows figure 1 shown.

[0057] The preparation method comprises the following steps:

[0058] (1) Clean the PCBN tool ultrasonically with acetone for 10 minutes, then dry it at 50°C for 4 minutes, then dry-polish it in diamond powder with a particle size of 100nm for 15 minutes until it is bright, and then place it on a pedestal with a height of 40mm. Put it into the MPCVD system and evacuate to the ultimate vacuum, and then pass H 2 ;

[0059] (2) Turn on the MPCVD system, set the microwave power to 600W, the air pressure in the working chamber to 10Torr, and excite H 2 Generate a plasma ball, and then pass CH 4 begins to deposit, the CH 4 and H 2 The gas flow ratio is 1:50, the microwave power is adjusted to 1500W during the deposition process, the air pressure of the working chamber is 40Torr, the tem...

Embodiment 2

[0067] The present embodiment provides a method for preparing a PCBN cutter with a nano-diamond film coating on the surface, the preparation method comprising the following steps:

[0068] (1) Clean the PCBN tool ultrasonically with acetone for 8 minutes, then dry it at 45°C for 5 minutes, then dry-polish it in diamond powder with a particle size of 10nm for 20 minutes until it is bright, and then place it on a pedestal with a height of 55mm. Put it into the MPCVD system and evacuate to the ultimate vacuum, and then pass H 2 ;

[0069] (2) Turn on the MPCVD system, set the microwave power to 500W, the air pressure in the working chamber to 8Torr, and excite H 2 Generate a plasma ball, then pass CH 4 begins to deposit, the CH 4 and H 2 The gas flow ratio is 4:25, the microwave power is adjusted to 1000W during the deposition process, the air pressure of the working chamber is 20Torr, the temperature of the abutment is 600°C, and the deposition is 12h. After the deposition i...

Embodiment 3

[0071] The present embodiment provides a method for preparing a PCBN cutter with a nano-diamond film coating on the surface, the preparation method comprising the following steps:

[0072] (1) The PCBN tool was ultrasonically cleaned with acetone for 12 minutes, then dried at 45°C for 4 minutes, then dry-polished in diamond powder with a particle size of 500nm for 18 minutes until bright, and then placed on a pedestal with a height of 45mm. Put it into the MPCVD system and evacuate to the ultimate vacuum, and then pass H 2 ;

[0073] (2) Turn on the MPCVD system, set the microwave power to 700W, the air pressure in the working chamber to 12Torr, and excite H 2 Generate a plasma ball, then pass CH 4 begins to deposit, the CH 4 and H 2 The gas flow ratio is 1:100, the microwave power is adjusted to 2000W during the deposition process, the pressure of the working chamber is 60Torr, the temperature of the abutment is 900°C, and the deposition is 6h. After the deposition is com...

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Abstract

The invention provides a PCBN cutter with a nano diamond film coating on the surface and a preparation method of the PCBN cutter. The preparation method comprises the following steps that the pretreated PCBN cutter is subjected to dry polishing in nano-diamond powder to be bright and then placed on a base station, the base station is placed in a microwave plasma chemical vapor deposition system to be vacuumized, vacuumizing is conducted, and then a first reaction source gas is introduced; and the microwave plasma chemical vapor deposition system is started, the first reaction source gas is excited by microwaves to generate plasma balls, then a second reaction source gas is introduced to start deposition, and the PCBN cutter with the nano-diamond film coating on the surface is obtained after deposition is completed. According to the preparation method, the microwave plasma chemical vapor deposition process is optimized, the nano-scale diamond coating is uniformly deposited on the surface of the cutter by regulating and controlling preparation conditions, the film quality and stability of the diamond coating are effectively improved, the service life of the cutter is prolonged, and the preparation method has good industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of superhard material film preparation, and in particular relates to a PCBN cutter with a nano-diamond film coating on the surface and a preparation method thereof. Background technique [0002] In recent years, polycrystalline cubic boron nitride (Polycrystalline Cubic Boron Nitride, PCBN) tool, as a new type of superhard material, has been used more and more in modern precision machining, especially in high-speed cutting, hard cutting , dry cutting and other fields show the incomparable superiority of other tool materials. PCBN is a synthetic substance whose hardness is second only to diamond, but unlike diamond tools, PCBN tools have poor affinity with Fe, and are especially suitable for cutting ferrous metals; compared with cemented carbide tools, the durability of PCBN tools is 10 times, and the cutting force is small when cutting ultra-high-strength materials and chemically active materials at high sp...

Claims

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Application Information

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IPC IPC(8): C23C16/02C23C16/34C23C16/511
CPCC23C16/0254C23C16/511C23C16/342
Inventor 王晓飞邬苏东李玉磊任富增赵予生
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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