The hardness and the modulus of elasticity of PEs could be similarly enhanced by energy deposition of nitrogen ion implantation. With the dose of 1.4×1017 ions.cm-2, the nanohardness significantly increased 15 to 10 times and the modulus of elasticity did 7 to 5 times at the indentation depth starting from 30 to 100 nm. An important transformation from plastic to elastic behaviour was clearly observed. As a PE was ion-implanted with low dose, its outermost surface became polarizable and it was wettable with a polar liquid. The study of the joint movement also supported that the increase of wettability could spread the Ringer's solution and potentially lubricate the ball-on-cup movement; furthermore, the wear rate of the modified PE could be decreased by the formation of an elastic and hardened layer at the surface. The non-crosslinkable effect was studied by the destructive depth profile and ir-active vibration mode. The result showed that the carbonyl created at the dose higher than 1016 ions.cm-2 became rigid and stronglybonded and it was introduced to less than 10 nm of depth. The superficial N functionalities were little detected, probably they were recoiled after giving the energy to the target material or consumed by gas evolution.
|頁（從 - 到）||41-48|
|期刊||Biomedical Engineering - Applications, Basis and Communications|
|出版狀態||Published - 1994 一月 1|
All Science Journal Classification (ASJC) codes
- Biomedical Engineering