Calcium phosphate and metallic porous coatings can adhere to a variety of metal substrates. Commonly they are used to encase bone implants. With a direct impact to orthopedic and dental implant degradation and bioactivity, coatings are carefully tested for quality. ASTM F1147 can act as a guide for testing these coatings to standard.
ASTM F1147
ASTM D1147 covers the level of adhesiveness of coatings to substrates, or the internal cohesion of a coating in tension normal to the surface plane. This standard subjects a specimen assembly composed of one coated and one uncoated component to a tensile test. In the case of the calcium phosphate coatings, the components to be tested must be bonded together by use of a polymeric adhesive. In the case of the metallic coatings, the components may either be bonded with the adhesive, or sintered together. The adhesive may be in film form or bulk form, but it must have a minimum bulk tensile strength of 34.5 MPa (5000 psi) or as great as the minimum required adhesion or cohesion strength of the coating, whichever is greater.
Testing Procedure
First the adhesive must be cured. The official standard lists an effective method of curing using a suggested adhesive, FM 1000. After the adhesive has been cured, apply a tensile load to each specimen until complete separation of the components has been achieved. Record the maximum load applied before complete separation.
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Designed in accordance to ASTM F1147
