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A test method for testing coating density

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: 2017-11-17
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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  • A test method for testing coating density
  • A test method for testing coating density
  • A test method for testing coating density

Examples

Experimental program
Comparison scheme
Effect test

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

[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 density ρ of the coating c : Get the above steps m s , ρ s Numerical values ​​are substituted into formula (8) to calculate the density ρ of the coati...

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 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 are ...

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Abstract

The invention provides a method for testing the coating density of a test material. The method adopts a conventional density testing method to measure the dry weight ms and the density ρs of the matrix layer specimen for a composite specimen composed of a matrix layer and a coating layer. And the dry weight density of the composite specimen is calculated using the derived formula to calculate the density ρc of the coating. The present invention is applicable to the test of single-coat and multi-coat materials. For multi-layer coating or gradient coating, the surface coating is ground off after each test of dry weight and density, and the dry weight and density are tested again. The measured dry weight and density were used to calculate the density of the abraded top coat. Repeat this step to test the density of the second coat. By analogy, the density of each layer can be tested. The invention solves the difficult problem of density testing of coatings, especially ceramic coatings, and has 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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Patent Type & Authority Patents(China)
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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