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Preparation method of diamond/tialn composite coating on the surface of cemented carbide tool

A cemented carbide and composite coating technology, which is applied in the direction of metal material coating process, coating, superimposed layer plating, etc., can solve the problems of uneven surface of composite coating, short service life, easy wear of tools, etc. Achieve excellent cutting performance, high cutting temperature, and improved working life

Active Publication Date: 2017-11-28
NANJING ZHONGCHE PUZHEN URBAN RAIL VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a method for preparing a diamond / TiAlN composite coating on the surface of a cemented carbide tool, to solve the problem that the surface of the composite coating in the prior art is uneven and easy to peel off, resulting in easy wear of the tool. Short-lived technical issues

Method used

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  • Preparation method of diamond/tialn composite coating on the surface of cemented carbide tool

Examples

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Effect test

Embodiment 1

[0030] Deposit the diamond / TiAlN composite coating on the surface of the special cemented carbide end mill for the aluminum alloy profile of the high-speed train body. The tool diameter is 32mm, the blade length is 80mm, and the length is 110mm. The specific steps are as follows:

[0031] (1) Soak the blade part of the cemented carbide tool in the Murakami solution for 30 minutes of ultrasonic cleaning, which will fragment the tungsten carbide (WC) particles on the surface of the cemented carbide and cause the surface of the substrate to roughen. The components of Murakami solution are potassium hydroxide (KOH), potassium ferricyanide (K 3 (Fe(CN) 6 )) and water (H 2 O), its mass ratio is KOH: K 3 (Fe(CN) 6 ): H 2 O = 1:1:10. Then the cemented carbide substrate was soaked in Caro mixed acid solution and etched for 1 minute to remove the cobalt element on its surface. The composition of Caro's mixed acid solution is concentrated sulfuric acid (H 2 SO 4 ) and hydrogen pe...

Embodiment 2

[0040] The diamond / TiAlN composite coating is deposited on the surface of the cemented carbide indexable turning insert for processing SiC particle reinforced aluminum matrix composite materials. The specific steps are as follows:

[0041] (1) Carbide indexable turning inserts were subjected to acid-alkali pretreatment by the same method as in Example 1.

[0042] (2) Place the pretreated cemented carbide indexable turning blade in the reaction chamber of the hot wire CVD equipment for the nucleation stage of depositing the diamond film. During the deposition process, the turning blade is supported by a stainless steel column with steps, and the stainless steel column is inserted on a copper block with a through hole, which not only stabilizes its supporting role, but also enhances the thermal conductivity. The hot wire is placed on both sides of the tool, and the deposition parameters used in the nucleation stage are: methane flow rate is 16 sccm, hydrogen flow rate is 800 scc...

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Abstract

The invention discloses a preparation method of a diamond / TiAlN composite coating on the surface of a hard alloy cutter. The technical problems that as composite coatings are not flat in surface and prone to peeling off in the prior art, a cutter is easily abraded and the service life is short are solved. The method comprises the steps that the surface of the hard alloy cutter is preprocessed through an acid-alkali two-step method; a diamond film deposits on the preprocessed surface of the hard alloy cutter through a hot filament chemical vapor deposition device, specifically, deposition of the diamond film comprises the nucleation stage and the growth stage; and a TiAlN film deposits through a direct current reactive magnetron sputtering method, specifically, deposition of the TiAlN film sequentially comprises diamond micro-powder polishing, organic solvent ultrasonic washing, glow bombardment washing and the growth stage of the TiAlN film. A composite coating prepared by the invention has the excellent film-matrix adhesion strength, the technical problem that the films are prone to peeling off is avoided, the abrasion resistance and high temperature resistance of the cutter are remarkably improved, and the service life of the cutter is greatly prolonged.

Description

technical field [0001] The invention relates to a method for preparing a composite coating, in particular to a method for preparing a diamond / TiAlN composite coating on the surface of a hard alloy tool. Background technique [0002] Chemical vapor deposition (Chemical Vapor Deposition, CVD) diamond film has many excellent properties close to natural diamond, such as high hardness, large elastic modulus, low friction coefficient, strong wear resistance and stable surface chemical properties. The preparation of CVD diamond film is not restricted by the shape of the substrate, and can be directly deposited on the surface of a variety of complex shapes of substrates. Therefore, it is very suitable as a wear-resistant, anti-friction and protective coating material applied to the outer surface of various tools, thereby To achieve the purpose of improving the wear resistance of the tool and prolonging the service life of the tool. [0003] The adhesion strength between the CVD dia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/04C23C16/27C23C14/06C23C14/35
Inventor 李春广龚兴华孟鹤朱伟
Owner NANJING ZHONGCHE PUZHEN URBAN RAIL VEHICLE CO LTD
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