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Testing method for testing density of coating

A testing method and coating technology, which can be used in measuring devices, specific gravity measurement, instruments, etc., can solve the problem that the coating density cannot be directly measured

Active Publication Date: 2015-02-04
CHINA TEST & CERTIFICATION INT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem that the coating density cannot be directly measured, and to provide a method for testing the density of a single-layer or multi-layer composite coating using a relative method

Method used

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  • Testing method for testing density of coating

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0082] Embodiment 1: the test of monolayer ceramic coating density

[0083] Specimen: a composite specimen of a chemical vapor deposited silicon carbide film on the surface of a graphite matrix layer.

[0084] experiment procedure:

[0085] 1) Measure and calculate the dry weight of the composite specimen and density Refer to the national standard GB / T25995-2010 to measure the dry weight of the composite specimen calculated density ρ ‾ = 2.0882 g / cm 3 ;

[0086] 2) Measure and calculate the dry weight of the substrate layer specimen and density Grind off the coating on the composite test piece to form a base layer test piece, and use the same method as step 1) to measure the dry weight m of the base layer test piece s =0.7451g, calculate the density ρ of the substrate layer specimen s =1.8539g / cm 3 ;

[0087] 3) Calculate the densi...

Embodiment 2

[0090] Embodiment 2: the test of multi-coat ceramic coating density

[0091] Test piece: carbon steel substrate thermal barrier coating test piece (the first layer of coating material is an anti-oxidation coating, the second layer of coating material is a zirconia coating, and the third layer of coating material is a nickel-chromium alloy coating) .

[0092] experiment procedure:

[0093] According to the same method as the above-mentioned single-coat density test, first test the dry weight and density of the initial test piece, grind off the set coating, and then test the dry weight of the remaining test piece (the remaining test piece is regarded as the base layer). Weight and density, put the relevant values ​​into the formula (8) to calculate the density of the worn-off coating, then wear off the second layer of coating, then test the dry weight and density of the remaining specimen and calculate the density of the worn-off layer, and then By analogy, the test results ...

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Abstract

The invention provides a testing method for testing the density of a coating. According to the method, a conventional density testing method is adopted; dry weight ms and density rhos of a base body layer test piece, and dry weight shown as the specification and density shown as the specification of a compound body test piece are respectively measured; and density rhoc of the coating is calculated by using a derived equation. The testing method is applicable to test of single-coating and multi-coating materials; when a multilayered coating or a gradient coating is tested, the surface coating is grinded after the dry weight and the density are tested for one time, and then the dry weight and the density are tested again; and the density of the grinded surface coating is calculated by the dry weights and the densities obtained by the two times of test. The step is repeated so that the density of the coating of the second layer can be tested. Through the way, the density of each layer can be tested. The difficulty of testing the density of the coatings, especially ceramic coatings is solved; and the testing method has a strong practical value.

Description

technical field [0001] The invention belongs to the technical field of mechanical property evaluation of composite materials, and relates to a method for testing the density of coatings, such as hard and brittle ceramic thermal barrier coatings, wear-resistant and corrosion-resistant insulating coatings, and the like. Background technique [0002] Ceramic coatings are more and more widely used in modern industry and defense industry, including aviation, aerospace, automobile, petrochemical and various high-temperature wear-resistant equipment. Plating a brittle ceramic coating with high hardness, high strength, corrosion resistance, wear resistance and high temperature resistance on metal or other solid materials by physical or chemical methods is of great significance for the performance improvement of modern machinery. In the chemical industry, many corrosive liquids pass through the inner wall of the pipeline coated with ceramic coating, the life and durability can be inc...

Claims

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Application Information

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IPC IPC(8): G01N9/02
Inventor 包亦望魏晨光万德田邱岩刘小根
Owner CHINA TEST & CERTIFICATION INT GRP CO LTD
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