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Diamond / W-C gradient structure composite coating and preparing method thereof

A gradient structure, composite coating technology, applied in the direction of metal material coating process, coating, overlay plating, etc., to achieve the effect of eliminating negative effects

Inactive Publication Date: 2009-07-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects of existing diamond-coated cemented carbide tools, provide a diamond / W-C gradient structure composite coating and its preparation method, which not only solves the problem of film / substrate bonding strength, but also ensures Diamond film surface finish

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  • Diamond / W-C gradient structure composite coating and preparing method thereof
  • Diamond / W-C gradient structure composite coating and preparing method thereof
  • Diamond / W-C gradient structure composite coating and preparing method thereof

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Embodiment 1

[0035] Embodiment 1: a kind of diamond / W-C gradient structure composite coating, comprise the transition layer of W-C gradient structure and diamond wear-resistant layer, described transition layer is made up of WC layer and WC-Co layer, and described wear-resistant layer is diamond film. The thickness of the transition layer is 0.5-15 μm, and the thickness of the wear-resistant layer is 4 μm; the WC layer includes the following four layers in turn: WC, WC 1-x , W 2 C and W3 C; where the value range of x is 0.34-0.43.

Embodiment 2

[0037] A preparation method of diamond / W-C gradient structure composite coating is as follows:

[0038] 1. The sample is WC-13%wt.Co (that is, YG13, containing 13% (mass ratio) of Co, and 87% (mass ratio) of WC). After polishing with diamond powder polishing agent, the atomic force microscope The detected surface roughness is less than 50nm. After treatment, wash with distilled water and dry for later use.

[0039] 2. Prepare a cobalt-rich layer on the surface of the sample: use K 3 [Fe(CN) 6 ]:KOH:H 2 O=1:1:10 (volume ratio) Murakami reagent was ultrasonically etched for 3 minutes, and the ultrasonic power was 100W.

[0040] 3. Gradient transition layer preparation: The sample was washed repeatedly with distilled water and absolute ethanol, and then reactively sputtered to prepare a W-C gradient transition layer. First, a layer of WC is deposited on the surface of the sample by reactive sputtering, and then the volume percentage of carbon-containing gas in the reaction at...

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Abstract

The invention discloses a composite coating of diamond / W-C gradient structure, and a preparation method thereof. The composite coating is characterized in that a composite coating which takes a W-C gradient structure as a transition layer and takes a diamond coating as a wearable coating is formed on a WC-Co hard alloy; the preparation method comprises the steps as follows: the hard alloy is used as a sample; a surface layer WC is dipped in Murakami reagent so as to form a Co-rich layer; subsequently, pure tungsten is taken as target material and argon and carbonaceous gas are used as reaction gases to prepare the W-C gradient structure of different structures as the transition layer by a reaction sputtering method by adjusting the concentration of carbonaceous active gas in the reaction gas, thus preparing the diamond wearable coating by a chemical vapor deposition technique. The composite coating solves the problem of the bonding strength of the film / substrate and ensures the surface smoothness of the diamond film.

Description

technical field [0001] The invention belongs to the field of diamond coating tool manufacture, and relates to a diamond / W-C gradient structure composite coating and a method for preparing the diamond / W-C gradient structure composite coating on a hard alloy tool. Background technique [0002] At present, cutting tools, sliding bearings, drawing dies and various wear-resistant components are all made of cemented carbide. In order to prolong the service life of these tools, a superhard coating is usually prepared on the surface to increase their wear resistance. Diamond combines excellent properties such as high hardness, high wear resistance, high thermal conductivity, low coefficient of friction, low coefficient of thermal expansion and good chemical stability. After preparing a layer of diamond film with good interface bonding and low surface roughness on the surface of cemented carbide tools, not only its service life can be increased several times or even dozens of times,...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C16/27C23C14/34C23C14/16
Inventor 魏秋平余志明陈永勤尹登峰
Owner CENT SOUTH UNIV
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