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A kind of cutting tool with superhard film coating and its preparation method

A hard coating and cutting tool technology, applied in coating, chemical instruments and methods, metal material coating technology, etc., can solve the problems of high surface roughness of thin films, fine grains and low roughness on the surface of nano-films, and improve the Finish and machining accuracy, excellent cutting performance, good wear resistance

Inactive Publication Date: 2014-10-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The micron film has high hardness and good wear resistance, but the surface roughness of the film is relatively high; while the surface of the nano film has fine grains and low roughness

Method used

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  • A kind of cutting tool with superhard film coating and its preparation method
  • A kind of cutting tool with superhard film coating and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see figure 1 , embodiment 1 adopts cemented carbide tool substrate 1, and its surface deposits micron superhard film 2 and nanoscale superhard film 3 secondly, and preparation process is as follows:

[0027] (1) Substrate pretreatment: the tool substrate 1 is first ultrasonically cleaned with acetone for 20 minutes, then ultrasonically cleaned with ethanol for 20 minutes, then ultrasonically ground with diamond micropowder suspension for 20 minutes, and cleaned with an argon glow discharge plasma cleaner for 20 minutes for future use ;

[0028] (2) Deposition of crystalline micron carbon nitride film: a layer of about 10 μm thick crystalline micron carbon nitride film (micron superhard film 2 ) is directly deposited on the surface of tool substrate 1 by CVD method. CVD methods such as: radio frequency assisted HFCVD method, microwave plasma CVD method, plasma jet CVD method, etc.

[0029](3) Deposition of crystalline nano-superhard film: After the preparation of the c...

Embodiment 2

[0031] Such as figure 2 , embodiment 2 adopts cemented carbide cutter substrate 1, and its surface deposits transition layer 4, micron superhard film 2 and nanoscale superhard film 3 successively, and the preparation process is as follows:

[0032] (1) Substrate pretreatment: Take the tool substrate 1 and clean it ultrasonically with acetone for 20 minutes, and then with ethanol for 20 minutes. In order to reduce the influence of Co on the deposited diamond film, etch the cemented carbide with an acid etchant for about 2 minutes. Ultrasonic grinding with diamond micropowder suspension for 20 minutes, and cleaning with argon glow discharge plasma cleaning machine for 20 minutes for standby;

[0033] (2) Micro / nano-diamond composite transition layer deposition: Put the cemented carbide tool into the vacuum deposition equipment, and use the CVD method (bias-assisted HFCVD method, microwave plasma CVD method, plasma jet CVD method, etc.) to deposit on the tool surface A layer of...

Embodiment 3

[0037] Such as figure 2 , embodiment 3 adopts cemented carbide tool substrate 1, and its surface deposits transition layer 4, micron superhard film 2 and nanoscale superhard film 3 successively, and the preparation process is as follows:

[0038] (1) Substrate pretreatment: Take the tool substrate 1 and clean it ultrasonically for 20 minutes with acetone, then ultrasonically clean it with ethanol for 20 minutes, then ultrasonically grind it with diamond micropowder suspension for 20 minutes, and clean it with an argon glow discharge plasma cleaner for 20 minutes before use. ;

[0039] (2) Deposition of micron or nano-diamond transition layer: Put the cemented carbide tool into the vacuum deposition equipment, and use CVD method (bias-assisted HFCVD method, microwave plasma CVD method, plasma jet CVD method) to deposit a layer on the surface of the tool Micron or nanocrystalline diamond with a thickness of about 0.8 μm to obtain a micron or nanodiamond transition layer 4;

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Abstract

The invention discloses a cutting tool with a superhard film coating and a preparation method thereof. The cutting tool includes a cutting tool substrate and a coating deposited on the cutting tool substrate; the coating includes a micron-order superhard film and a nano-order superhard film; The superhard film is directly deposited on the surface of the tool substrate; the nanoscale superhard film is deposited on the surface of the micron superhard film; the superhard film is selected from crystalline carbon nitride film or crystalline cubic boron nitride film. The composite coating prepared by the invention has the advantages of smooth surface, low friction coefficient, high hardness, high wear resistance, and good adhesion to the tool matrix. The coated tool is not only suitable for processing non-ferrous metals, non-ferrous alloys, non-metallic materials, but also for processing steel and other materials; it is not only suitable for semi-finishing, but also suitable for finishing.

Description

technical field [0001] The invention relates to a cutting tool with a superhard film coating and a preparation method thereof. Specifically, it is a method for depositing a crystalline carbon nitride or cubic boron nitride composite coating on a cemented carbide tool substrate, and belongs to the technical field of coating tool preparation. Background technique [0002] High-performance coated tools have become a symbol of modern tools. It combines the tool substrate with a hard film. Because the substrate maintains good toughness and high strength, the hard film has high wear resistance and low coefficient of friction. The characteristics of the tool greatly improve the cutting performance of the tool. The hard coating on the surface of the tool has the following requirements for the material: high hardness and high wear resistance, high chemical stability, high temperature oxidation resistance, low friction coefficient and firm adhesion to the substrate. Among the hard...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/04B32B9/04C23C16/34C23C16/44C23C16/27C23C14/06
Inventor 相炳坤李文帅朱其豹左敦稳黎向锋孙业斌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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