Adhesion Strength and Mechanical Failure ASTM C1624

Adhesion Strength and Mechanical Failure ASTM C1624

The test method in ASTM C1624 assesses the practical adhesion strength, failure modes, and mechanical integrity of a given ceramic specimen on metal and ceramic substrates at ambient temperatures.

    Scope:

    The test procedure in ASTM C1624 gives quantitative measurement of extrinsic adhesion strength and damage resistance of the coating-substrate changing as a function of the applied force. This test method is applicable to a large range of hard ceramic coating compositions like – nitrides, carbides, oxides and diamond like carbon structure on either ceramic or metallic surface.

    Test Procedure:

    The test method in ASTM C1624 uses a diamond stylus of predefined geometry, for drawing on the flat surface of a coated test specimen at a uniform speed. A predefined constant, or periodically increasing normal force is applied at a defined distance. The force level which produces a defined type of damage in the coating is defined as a critical scratch load. The test described in ASTM C1624 also elaborates on usage of tangential force and acoustic emission signals. This acts as a secondary test data to differentiate coating damage levels.

     Specimen size:

    The test method in ASTM C1624 cannot use polymer coatings, ductile metal coatings which are very thin (<0.1 μm), or very thick (>30 μm). So it is perfect for ceramic coating in between thickness.

    Data:

    The value of thickness in ASTM C1624 is defined in terms of diamond stylus bearing 200 μm radius. These values range between 0.1 – 30 μm. The testing specimens often have planar geometry, while having cylindrical structure is also not uncommon. Also thinner coatings might require smaller diameter styluses and less normal forces.

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