ASTM F is a standard test method for shear testing calcium phosphate adhesion strength to metallic substrates under uniaxial shear stress. Calcium phosphate and metallic coatings are used on a wide variety of metal substrates around the world, and commonly on orthopedic implants. Measuring the adhesive quality of these products is essential due to their direct impact on implant degradation and bioactivity. This newer version provides a means of testing and comparing different calcium phosphate thermal sprays to determine the high adhesion characteristics. Acquire a polymeric adhesive that is capable of bonding the coating on the test specimen with a shear strength of at least Cure the adhesive agent and prepare a minimum of five test specimens.
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ASTM D ASTM B ASTM B Designation: F — 05 Standard Test Method for Shear Testing of Calcium Phosphate Coatings and Metallic Coatings1 This standard is issued under the xed designation F ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Scope 1. It assesses the degree of adhesion of coatings to substrates, or the internal cohesion of a coating in shear, parallel to the surface plane. The values given in parentheses are for information only. This standard does not purport to address all of the safety concerns, if any, associated with its use.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Referenced Documents 2. Terminology 3. Summary of Test Method 4. Current edition approved April 1, Published April Originally approved in Last previous edition approved in as F — The adhesive may be in lm form or bulk form, but it must have a minimum bulk shear strength of Signicance and Use 5. Information developed using this test method may be useful for certain quality control and design purposes.
The specimen being evaluated must be representative of the actual end-use coating. Apparatus 6. See also Test Methods E 8. To ensure axial shear stress, it is important that the specimen axis coincide with the centerline of the heads of the testing machine and that the coating test plane be parallel to the axial load. Some coatings, such as porous ber metal coatings, may be bonded by sintering without the use of this xture. It shall be made of hardened steel having a hardness of not less than Rockwell C To minimize the possible effect of distortion of the device under load, tted and machined steel bolts may be used to hold the components together.
The interfaces between the tongue and clevises shall be smooth. Adhesive Bonding Materials 7. The FM Adhesive Film3 with a thickness of 0. Testing should be performed without the presence of the calcium phosphate coating to establish the performance of the adhesive. Your comments will receive careful consideration at a meeting of the responsible technical committee,1 which you may attend. A complete, assembled test assembly consists of two solid pieces; one with a coated surface and the other with an uncoated surface.
The uncoated surface may be roughened to aid in the bonding of the adhesive. When specimens of another cross-sectional area are used, the data must be demonstrated to be equivalent to 2. The dimensions of test specimens differing from Fig. This may be accomplished by suitably shimming the specimen within the grips. All test specimens for coating characterization shall be prepared from indicative coating lots, using production FIG.
Test Specimen 8. Specimen components must be properly aligned in order that generated stresses be purely axial, that is, parallel to the coated surface. The coating should consist of a layer which is mechanically or chemically attached and covers the surface. Lack of coating in highly stressed regions, as well as nonuniform coating appearance, shall be cause for specimen rejection.
For lap shear specimens, the thickness should be measured at the center and all four corners of the coated area to 0. Procedure 9. One suggested adhesive commonly used with calcium phosphate coatings is FM having a thickness of 0. This material has successfully been cured using the following cycle: 9. It is suggested that initially the curing cycle be optimized without the coating present.
A spatula or tongue depressor may be used as an application device. During curing, ensure that the xture maintains a mild pressure at the joint, and force bonding faces to remain parallel and maintain the axial alignment. For sintered or diffusion bonded coating systems, the test specimen congurations indicated in Figs. The details of the specimen fabrication process will necessarily be unique to each coating system. Perform appropriate inspections to ensure that the microstructure and morphology of the coating in the test specimen conguration are representative of nish production parts see 8.
Continue the test until complete separation of the components has been achieved. Record the maximum load applied. Stress Calculation Report Precision and Bias The specimens tested were of the lap shear design and were plasma-spray coatings of titanium-6aluminum4vanadium on a titanium-6aluminum-4vanadium substrate.
Thus, no statements regarding the deviation of values measured in accordance with these procedures, from accepted values, is possible. Keywords Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone , fax , or service astm.
The inuence of coatings on the resulting shear behavior of the system must be viewed as a combination of the surface roughening treatments required to apply the coating, the thermal effects of the coating process, and any other secondary treatments employed.
ASTM D ASTM B ASTM B Designation: F — 05 Standard Test Method for Shear Testing of Calcium Phosphate Coatings and Metallic Coatings1 This standard is issued under the xed designation F ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
It assesses the degree of adhesion of coatings to substrates, or the internal cohesion of a coating in shear, parallel to the surface plane. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Multi-user access to over 3, medical device standards, regulations, expert commentaries and other documents. Worldwide Standards We can source any standard from anywhere in the world.
ASTM F1044 - 05(2017)e1
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