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Adhesion failure behavior of sputtered calcium phosphate thin film coatings evaluated using microscratch testing
J A Toque1, M K Herliansyah, M Hamdi
1Department of Mechanical Engineering, University of the Philippines, Diliman, Quezon City, Philippines. jatoque@gmail.com
Journal of the Mechanical Behavior of Biomedical Materials
|March 30, 2010
Summary
Calcium phosphate (CaP) coatings are vital biomaterials, but their mechanical properties require thorough understanding. This study investigated CaP coating adhesion strength and failure mechanisms using microscratch testing.
Area of Science:
- Biomaterials Science
- Materials Engineering
- Surface Science
Background:
- Calcium phosphate (CaP) coatings are crucial for implant applications due to their bioactivity.
- However, their limited mechanical properties hinder widespread use.
- Understanding CaP coating mechanical behavior under stress is essential for improving implant longevity.
Purpose of the Study:
- To investigate the adhesion strength and failure mechanisms of CaP thin films.
- To analyze the influence of processing parameters on CaP coating mechanical properties.
- To evaluate the effect of scratch testing parameters on adhesion failure modes.
Main Methods:
- Radio frequency-magnetron sputtering (RF-MS) was used to deposit CaP thin films on 316L stainless steel.
- Microscratch testing was employed to assess coating adhesion and failure.
- Load-displacement data and optical microscopy were used to analyze scratch behavior.
Main Results:
- CaP coating adhesion strength varied based on factors like thickness, heat treatment, and deposition parameters.
- Scratch testing parameters, including loading rate and scratch speed, influenced adhesion failure mechanisms.
- Multiple failure modes, such as cracking, buckling, and delamination, were observed.
Conclusions:
- Coating process and scratch testing parameters significantly impact CaP coating adhesion and failure.
- Microscratch testing provides valuable insights into CaP coating mechanical integrity.
- Further research can optimize CaP coatings for enhanced performance in biomedical implants.
