Research of microstructure and properties on titanium implant with TiO2 layer by plasma treatment

• Main Authors: Yu-Hao Chan, 詹育豪
• Other Authors: Ching-Sang Cheng
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/32617083997459253493

碩士 === 龍華科技大學 === 機械系碩士班 === 94 === Titanium-based alloys such as CP-Ti and Ti-6Al-4V are currently widely used in biomaterial fields due to low density, high toughness, low thermal conductivity, favorable mechanical properties, and excellent biocompatibility. The properties of titanium dioxide (TiO2) layer which is spontaneously covered by a surface oxide of 1.5–10 nm thickness in air at room temperature can reveal the good biocompatibility of titanium implants. Several reports show the importance of the implant oxide surface properties for a successful osseointegration. Recently, the applications of surface modification by plasma have been wildly used in biomaterials which are believed to improve the mechanical properties and enhance the biocompatibility. In this study, the radical frequency plasma glow discharge method with oxygen is utilized to modify the surface of Ti-6Al-4V. The physical properties of the specimens are also evaluated by electrochemical measurements and material analyses. The result indicates that the amount of oxygen has been increased obviously by plasma treatment. As increasing the power, reaction time, temperature, the amount of oxygen increases. The properties of the titanium implants are changed by increasing the thickness of oxide layer. Once the thickness of Rutile-TiO2 layer reach around 400 nm, it has excellent blood compatibility and hydrophile. It can improve the adherence between titanium implant and cells or proteins. High power plasma can enhance effectively the hardness of the titanium alloy which can reduce the probability of metal ion releasing and increase the wear resistance and the lifespan of implants.