ASTM C1624-05(2015)
通过定量单点划痕试验测定陶瓷涂层的粘附强度和机械失效模式的标准试验方法

Standard Test Method for Adhesion Strength and Mechanical Failure Modes of Ceramic Coatings by Quantitative Single Point Scratch Testing

被代替

标准号

ASTM C1624-05(2015)

发布

2005年

发布单位

美国材料与试验协会

替代标准

ASTM C1624-22

当前最新

ASTM C1624-22

 

 

引用标准

ASME B46.1 ASTM B659 ASTM E1316 ASTM E18 ASTM E1932 ASTM E4 ASTM E750 IEEE/ASTM SI 10

适用范围

5.1 This test is intended to assess the mechanical integrity, failure modes, and practical adhesion strength of a specific hard ceramic coating on a given metal or ceramic substrate. The test method does not measure the fundamental “adhesion strength” of the bond between the coating and the substrate. Rather, the test method gives a quantitative engineering measurement of the practical (extrinsic) adhesion strength and damage resistance of the coating-substrate system as a function of applied normal force. The adhesion strength and damage modes depend on the complex interaction of the coating/substrate properties (hardness, fracture strength, modulus of elasticity, damage mechanisms, microstructure, flaw population, surface roughness, and so forth) and the test parameters (stylus properties and geometry, loading rate, displacement rate, and so forth).

5.2 The quantitative coating adhesion scratch test is a simple, practical, and rapid test. However, reliable and reproducible test results require careful control of the test system configuration and testing parameters, detailed analysis of the coating damage features, and appropriate characterization of the properties and morphology of the coating and the substrate of the test specimens.

5.3 The coating adhesion test has direct application across the full range of coating development, engineering, and production efforts. Measurements of the damage mechanisms in a coating as a function of applied normal forces are useful to understand material-process-property relations; quantify and qualify the mechanical response of coating-substrate systems; assess coating durability; measure production quality; and support failure analysis.

5.4 This test method is applicable to a wide range of hard ceramic coating compositions—carbides, nitrides, oxides, diamond, and diamond like carbon—applied by physical vapor deposition, chemical vapor deposition, and direct oxidation methods to metal and ceramic substrates.

Note 2: Under narrow circumstances, the test may be used for ceramic coatings on polymer substrates with due consideration of the differences in elastic modulus, ductility, and strength between the two types of materials. Commonly, the low comparative modulus of the polymer substrate means that the ceramic coating will generally tend to fail in bending (through-thickness adhesive failure) before cohesive failure in the coating itself.

5.5 Ceramic coatings can be crystalline or amorphous, but commonly have high relative density with limited porosity (<58201;%). Porous coatings can be tested, but the effects of porosity on the damage mechanisms in the coating must be carefully considered.

5.6 The test method, as defined with the 200 μm radius Rockwell diamond stylus, is commonly used for ceramic coating thicknesses in the range of 0.10 to 30 μm. Thinner coatings may require a smaller diameter stylus and lower normal forces for reliable results. Thicker coatings may require larger diameter stylus and higher normal forces. Any variations in stylus size and geometry and designated normal force ranges shall be reported.

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