Adhesion failure behavior of sputtered calcium phosphate thin film coatings evaluated using microscratch testing

Toque, Jay Arre and Herliansyah, Muhammad Kusumawan and Abd Shukor, Mohd Hamdi and Ide-Ektessabi, A. and Sopyan, Iis (2010) Adhesion failure behavior of sputtered calcium phosphate thin film coatings evaluated using microscratch testing. Journal of the Mechanical Behavior of Biomedical Materials, 3. pp. 324-330. ISSN 1751-6161

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Abstract

It is generally accepted that calcium phosphate (CaP) is one of the most important biomaterials in implant coating applications mainly because of its excellent bioactivity. However, its relatively poor mechanical properties limits its application. This entails that a better understanding of the mechanical properties of a CaP coating is a must especially its behavior and the mechanisms involved when subjected to stresses which eventually lead to failure. The mechanical properties of the coating may be evaluated in terms of its adhesion strength. In this study, a radio frequency­magnetron (RF­MS) sputtering technique was used to deposit CaP thin films on 316L stainless steel (SS). The coatings were subjected to series of microscratch tests, taking careful note of its behavior as the load is applied. The adhesion behavior of the coatings showed varying responses. It was revealed that several coating process­related factors such as thickness, post­heat treatment and deposition parameters, to name a few, affect its scratching behavior. Scratch testing­related factors (i.e. loading rate, scratch speed, scratch load, etc.) were also shown to influence the mechanisms involved in the coating adhesion failure. Evaluation of the load displacement graph combined with optical inspection of the scratch confirmed that several modes of failure occurred during the scratching process. These include trackside cracking, tensile cracking, radial cracking, buckling, delamination and combinations of one or more modes.

Item Type:	Article (Journal)
Additional Information:	4809/4614
Uncontrolled Keywords:	CaP coating, radio frequency­magnetron (RF­MS)
Subjects:	T Technology > T Technology (General)
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	PROF. DR. IIS SOPYAN
Date Deposited:	28 Sep 2011 12:18
Last Modified:	28 Sep 2011 12:18
URI:	http://irep.iium.edu.my/id/eprint/4614

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