Bio Medical Application

A biomaterial is a synthetic or natural material
used to replace part of a living system or to function in
intimate contact with living tissue. Williams defined
biomaterials as “nonviable materials used in medical
devices, intended to interact with the biological systems”.
Stainless steel is mainly used as a bio material in various
implants. The most common materials suitable for
orthopedic implants are stainless steel, cobalt and nickelalloy
enriched with chromium or molybdenum, and
titanium or titanium alloys. From these alloys stainless
steel 316L is selected for this study because it possess
austenitic phase in room temperature, sufficient corrosion
resistance, good mechanical property and
biocompatibility, acceptable strength to sustain cyclic
loading endured by the joint, high wear resistance to
minimize wear debris generation.
For improving various mechanical properties of
stainless steel ion implantation is done on the surface.
Microstructural effects due to the interaction between the
ions of the ion beam and the atoms of the target are
produced in the surface during ion implantation. This
effect is responsible for modifications in wear hardness
and corrosion resistance, ion implantation uses highly
energetic beams of ions to modify surface structure and
chemistry of materials at low temperature. Helium,
nitrogen and oxygen were implanted on stainless steel
316L, to improve its surface properties.
This paper gives an overall view of the ion
implantation process in various materials which attract
the attention of researchers and it provides light on the
improvement of various characteristics of bio materials. It
allows the comparison of various ion implanted material
and the better one can be selected for specific application.

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Thu, 14/04/2011 - 01:30