This standard is issued under the fixed designation C; the number 1 This test method is under the jurisdiction of ASTM Committee B08 on Metallic. ASTM C determines the bonding strength of thermal spray coatings. ASTM Standard C, “Standard Test Method for Adhesion or Cohesive Strength of Flame-Sprayed Coatings,” is widely used in industry and research for .

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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. Another cylinder with the same diameter is glued on top of this.

Further development may establish that thin layers of certain types of especially dense coatings may be tested satisfactorily. Description Literature Contact Us The ASTM C test method is used to determine the adhesion or cohesion strength of a thermal spray by subjecting it to tension perpendicular to the surface.

ASTM C633 Thermal Spray Coatings Adhesion Test Equipment and Solutions

To spray-coat a cylinder end is not necessarily a good representation of spraying another surface; If a coating adhesion on a particular substrate is to be investigated special test cylinders of the same material need to be made; The test procedure is slow and cumbersome; Not everybody has access to a tensile testing machine, and they can be very expensive to purchase The Solution The PAT adhesion tester has addressed all these problems.

Bonding strength of thermal spray determines the adhesive strength between the coating and substrate. We use cookies to improve your browsing experience. Why does the test cylinder have to be one inch diameter?

Also, in use, a coating may be stressed in a more complex manner than is practical for a standard test. The substrate with coating is then glued to another cylinder of equal diameter. If failure occurs within the coating, the result is referred to as the cohesion strength. The entire ASTM C specification should be reviewed prior to performing the test to ensure correct substrate surface preparation, application of coatings and test speeds.


The limitation is imposed because an adhesive bonding agent is used in the test. These parameters were originally set because of the limitations of tensile testing machines. ASTM C determines the bonding strength of thermal spray coatings.

Email addresses must contain the symbol. 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. In some cases, a coating is formed of different spray materials, such as an oxide layer sprayed onto a sprayed metal-bonding layer. The challenges of testing to this standard are: Assuming a fracture value of 20 MPa psi the stress increase during testing with conventional tensile testers is more than MPapsi per second!

It is useful for comparing adhesion or cohesion strengths of coatings of similar types of thermal spray materials. Alternatively, new adhesive bonding agents that would allow reduction of the minimum thickness limitation may become available.

Data rate used to capture the maximum peak Fixtures in accordance with the standard Instron Solution: By means c363 our testing expertise and modular product design, we will help find the testing solution that is right for you. Check this box to receive pertinent commercial email from Instron focusing on products, upcoming events, and more! ASTM C testing standard is often specified as a default standard.

Contact Us Request an Accessory Catalog. Discover simpler and smarter testing with features such as pre-loaded test methods, QuickTest adtm seconds, enhanced data exporting: They were big machines with a measurably moving traverse to measure elongation.

With PAT there is a choice. Higher temperature testing is restricted by the need for a suitable adhesive bonding agent.

ASTM C Adhesion or Cohesion Strength of Thermal Spray Coatings – Instron

Next Checking to see if you are a returning visitor…. We are confident that we have what you are looking for. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.


The maximum force is then normalized over the cross-sectional area to give adhesion or cohesion strength of the thermal spray. Cohesion strength of thermal spray is a measurement of tensile strength of the adhesive coating.

ASTM C is used for comparing adhesion or cohesion strengths of coatings of similar types of thermal spray materials.

Maximum pull stress is recorded. Users of previous versions of software such as Bluehill 2 and Bluehill 3 can easily upgrade to the newest version of Bluehill.

ASTM C633 Bond Strength Fixture Thermal Spray | GC633-179

In addition to this, we find it extremely useful to incorporate an axial slack coupling into the design of the loading fixture as it greatly improves setup time. This is determined with a peel test.

How bad is it? The results of the test should not be used to make absolute calculations relating to how much stress a part can withstand during use due to the shape differences between the part and the ASTM C test fixture. ASTM C is mainly a quality control test but may be used to qualify thermal spray equipment. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator.

Bluehill Universal Brochure Bluehill Universal Software is built from the ground-up for touch interaction and an intuitive user experience. The adhesive bonding agent should not be the “weakest link”, but should be at least as strong as the minimum required adhesion or cohesion strength of the coating. What about the tensile increase rate?

If failure is entirely at the coating-substrate interface, then the result is referred to as the adhesion strength. The stress increase should be the same regardless of coating thickness! In order to measure the bond strength, the thermal spray coating is applied to the substrate which is in the shape of a cylinder.