Hard coating toughening structure and toughness evaluation method

A hard coating and coating technology, applied in the direction of coating, metal material coating technology, strength characteristics, etc., to achieve the effects of wide application range, convenient and easy design, and intuitive and reliable test results

Pending Publication Date: 2022-07-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above toughness evaluation methods all have different degrees of defects.

Method used

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  • Hard coating toughening structure and toughness evaluation method
  • Hard coating toughening structure and toughness evaluation method
  • Hard coating toughening structure and toughness evaluation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In order to illustrate the design and toughening method of the multi-layer hexagonal structure of the hard coating, the ultra-thick CrN coating was prepared by applying the magnetic filtered cathodic vacuum arc deposition system (FCVA) on the steel substrate as an example. .

[0035] According to the characteristics of the CrN coating process, the deposition process is described as follows:

[0036] (1) After grinding and polishing, the surface roughness of the substrate reaches 0.07±0.03μm. Put the processed substrate into an ultrasonic container filled with acetone solution for ultrasonic cleaning for 30 min, and then add ethanol for ultrasonic cleaning for 20 min. Blow dry after cleaning.

[0037] (2) Put the hexagonal structure baffle drive mechanism into the vacuum chamber of the FCVA system, such as image 3 shown. Mount the matrix on the sample stage of the FCVA system.

[0038] (3) After vacuuming, the degree of vacuum is 2.5×10 -3MPa, start Cr deposition,...

Embodiment 2

[0049] This example presents a specific implementation method of toughness assessment.

[0050] Taking the ultra-thick CrN coating prepared in Example 1 as an example, the description is as follows:

[0051] (1) The end faces A and B of the sample substrate 19 are polished to mirror surfaces and then butted together, and the surface roughness of the end faces A and B is less than 0.07 μm. into fixture 21, as in Figure 7 shown. Put the sample bottom plate 26 into the back of the substrate, and tighten the substrate fixing bolts 24 to ensure that the surface of the substrate where the coating is deposited is flat. The mounting holes of the fixture 22 are fixed on the sample stage where the coating is deposited.

[0052] (2) Deposit a CrN coating on the substrate to obtain Image 6 Coated substrate test sample 20 is shown.

[0053] (3) Loading the sample 20 Figure 9 Testing was performed on the coating toughness testing apparatus shown. First put the sample on the sample...

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Abstract

The invention provides a physical vapor deposition hard coating multilayer hexagonal structure design toughening and toughness evaluation method. The design of the multilayer hexagonal structure of the hard coating for toughening specifically refers to alternate deposition of a soft layer and a hard layer. In the soft layer deposition process, the regular hexagon through holes are designed in the baffles, soft layers evenly distributed in the one-third area of the base body are deposited, and the other parts are shielded by the baffles. The coating toughening design of one modulation period is completed through alternate deposition of the soft layers and the hard layers for three times, and modulation of multiple periods can be achieved according to requirements. And in one modulation period, the regular hexagonal soft layer area is not overlapped in the same area of the substrate when the soft layer is deposited each time. According to coating toughness evaluation, the coatings are deposited on the two base bodies at the same time, the end faces of the two base bodies are completely in butt joint, and it is guaranteed that the butt joint faces are smooth and have the good fitting degree. After a coating is deposited on the sample on the special clamp, the fracture moment and surface appearance of the coating are tested on a toughness testing device. And the toughness is evaluated by analyzing the fracture moment, the loading force-displacement curve and the fracture morphology.

Description

technical field [0001] The invention relates to the field of physical vapor deposition technology surface modification, in particular to a structural design process for increasing the toughness of a hard coating and a method for evaluating the toughness of the coating. Background technique [0002] At present, hard coatings prepared by physical vapor deposition technology are widely used in cutting tools, molds, medical equipment, automobiles and other fields. In practical applications, it is found that hard coatings generally have problems such as high hardness, high brittleness, and high internal stress. These problems reduce the adhesion of the coating to the substrate, and it is easy for the coating to peel off. Especially in application scenarios that require large flat deposition coatings and require larger thicknesses. Application scenarios such as large molds, etc. In response to this problem, it is necessary to increase the toughness of the coating under the cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/04C23C14/06C23C14/14C23C14/32G01N3/02G01N3/04
CPCC23C14/042C23C14/325C23C14/0641C23C14/0021C23C14/14G01N3/02G01N3/04
Inventor 刘吉良
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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