ASTM C633 PDF

More B The test should not be considered to provide an intrinsic value for direct use in making calculations, such as to determine if a coating will withstand specific environmental stresses. Because of residual stresses in thermal spray coatings, actual strength depends upon the shape of the particular coated part. Also, in use, a coating may be stressed in a more complex manner than is practical for a standard test. Scope 1.

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More B The test should not be considered to provide an intrinsic value for direct use in making calculations, such as to determine if a coating will withstand specific environmental stresses. Because of residual stresses in thermal spray coatings, actual strength depends upon the shape of the particular coated part.

Also, in use, a coating may be stressed in a more complex manner than is practical for a standard test. Scope 1. The test consists of coating one face of a substrate fixture, bonding this coating to the face of a loading fixture, and subjecting this assembly of coating and fixtures to a tensile load normal to the plane of the coating. It is adapted particularly for testing coatings applied by thermal spray, which is defined to include the combustion flame, plasma arc, two-wire arc, high-velocity oxygen fuel, and detonation processes for spraying feedstock, which may be in the form of, wire, rod, or powder.

In some cases, a coating is formed of different spray materials, such as an oxide layer sprayed onto a sprayed metal-bonding layer. The substrate generally is a metal, but may be a ceramic, such as an oxide or graphite. Higher temperature testing is restricted by the need for a suitable adhesive bonding agent.

For certain fundamental investigations, it is suggested that very low cryogenic temperature be used. The limitation is imposed because an adhesive bonding agent is used in the test. Those bonding agents established so far for this method tend to penetrate thermal spray coatings and may invalidate results unless the coatings are thick enough to prevent penetration through the coating. Further development may establish that thin layers of certain types of especially dense coatings may be tested satisfactorily.

Alternatively, new adhesive bonding agents that would allow reduction of the minimum thickness limitation may become available. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. It is the responsibility of the user of this standard to establish appropriate safety and health limitations prior to use.

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ASTM C633 PDF

The test is performed by applying a thermal spray coating to one face of a substrate fixture, bonding this coating to the face of a loading fixture, then applying a tensile force normal to the plane of the coating. Thermal spray coating materials include ceramics and metals. In some case a coating is formed of different spray materials. The substrate is generally a metal but may be a ceramic.

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ASTM C633 Thermal Spray Coatings Adhesion Test Equipment and Solutions

Nekasa This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Assuming a fracture value of 20 MPa psi the stress increase during testing with conventional tensile testers is more than MPapsi per second! The substrate fixture that spray coating is applied to is most commonly a cylinder made of the same metal that would be used as the substrate of the coating in its actual use. For certain fundamental investigations, it is suggested that very low cryogenic temperature be used. It is important to review ASTM C in order to fully understand the test setup, procedure, and results requirements. E 4 Practices for Force Veri? The coating thickness shall not vary across the surface by more than 0.

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ASTM C633 Thermal Spray Adhesion Testing

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