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Method for quantitative detection of indentation fracture toughness of coating material

A quantitative detection method and fracture toughness technology, applied in the direction of analyzing materials, testing the hardness of materials, and testing the strength of materials by applying stable tension/pressure. question

Inactive Publication Date: 2019-03-01
CASIC DEFENSE TECH RES & TEST CENT
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  • Description
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  • Application Information

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Problems solved by technology

For thinner and better bonding coating or film materials, it can be used to analyze and test the thickness and characteristic size of the coating is very limited. There are many problems and deficiencies in the evaluation of combined strength, which has become inapplicable; in addition, for the high-temperature test method for simulating the combined thermal-mechanical failure process, although the modified bending method can inhibit the brittle coating from spalling, buckling and other dissipation Deformation behavior, but the insufficient high temperature bearing capacity of the adhesive layer used to make the sample limits the increase of the experimental temperature

Method used

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  • Method for quantitative detection of indentation fracture toughness of coating material
  • Method for quantitative detection of indentation fracture toughness of coating material
  • Method for quantitative detection of indentation fracture toughness of coating material

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Embodiment Construction

[0054] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0055] Such as Figure 1 to Figure 4 As shown, a quantitative detection method for indentation fracture toughness of a coating material includes the following steps: 1), using an indenter to apply a pressure P to the coating surface to generate indentations and cracks; 2), determining the indentation of the coating surface Modulus E, indentation hardness H, and crack characteristic length c; 3) Substitute indentation modulus E, indentation hardness H, crack characteristic length c, and pressure P into The indentation fracture toughness K of the material is obtained c .

[0056] Depend on and Simultaneously, where λ r (φ) is a dimensionless quantity independent of the pressure head, ε=λ r (φ)(cotα) 2 / 3 .

[00...

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Abstract

The invention discloses a method for quantitative detection of indentation fracture toughness of a coating material. The method includes steps: 1) adopting a pressing head for applying pressure intensity P to the coating surface to form indentation and cracks; 2) determining a coating surface indentation modulus E, indentation hardness H and crack characteristic length c; 3) substituting the indentation modulus E, indentation hardness H, crack characteristic length c and the pressure intensity P into a formula as shown in the specification to obtain material indentation fracture toughness Kc.A method for quantitative assessment of indentation fracture toughness of the coating material can be created according to indentation cracking characteristics to provide basic data support for coating mechanical property design and environmental adaptability assessment.

Description

technical field [0001] The invention belongs to the technical field of material mechanical performance testing and evaluation, and specifically relates to a quantitative detection method for indentation fracture toughness of coating materials. Background technique [0002] In modern power equipment and electronic products, in order to meet specific environmental protection and functional requirements, such as heat protection, electrical conductivity, insulation, anti-corrosion, stealth, etc., multi-layer coatings are coated on the surface of key components by bonding, deposition, spraying, etc. or film materials, these coating / substrate material systems may be subjected to high temperature, vibration, temperature cycle and other environmental-load combined damage during use for a long time, and there may be differences in the mechanical properties and thermophysical properties of the coating and the substrate material. If there is a large difference, it is easy to generate a...

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Application Information

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IPC IPC(8): G01N3/08G01N3/42
CPCG01N3/08G01N3/42G01N2203/0019G01N2203/0067G01N2203/008
Inventor 赵朋飞
Owner CASIC DEFENSE TECH RES & TEST CENT
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