Please use this identifier to cite or link to this item:
Surface treatment of 316L stainless steel orthodontic miniscrew
316L stainless steel orthodontic miniscrews,surface modification,electron beam evaporation,titanium,titanium dioxide,
|Publication Year :||2011|
實驗第二部分採用物理氣相沉積法中的電子束蒸鍍技術，在316L不銹鋼板上鍍鈦或二氧化鈦，利用電子顯微鏡和原子力顯微鏡做觀察，研究結果顯示：試片表面具有明顯的奧氏體晶粒與晶界，表面粗糙度為 61±14.3 nm，薄膜順著試片的表面粗糙度做沉積，卻不一定能完全填滿晶界造成的溝槽，與基板間也非完全緊貼，當受到切割與拋光處理，有部分膜層因受力而剝落。但此技術所產生的晶粒可以小至15nm，相同蒸鍍源下，蒸鍍速率越大，晶粒大小越大，表面粗糙度也越大，而本實驗亦證實鍍膜後並未改變不銹鋼試片的表面粗糙度。
316L stainless steel orthodontic miniscrews were quite popular in clinical orthodontics, especially in Taiwan. However, the success rate was not good as titanium alloy. We try to improve it by making osseointergration happened. In other words, our research goal was to do some surface modification of 316L stainless steel without changing its properties. The study was divided into two parts:
Part I: we learned the pros and cons of physical vapor deposition（PVD）and sol-gel method from literature review. Ti or TiO2 were coated on 316L stainless steel orthodontic miniscrews either by PVD or sol-gel method, which was supported by manufactory. After analyzing these products, we chose PVD for further investigation because of minimum or no change of the substrate.
Part II：Ti or TiO2 thin films were coated on 316L stainless steel sheet by electron beam evaporation. Then, we used FE-SEM（Field Emission Scanning Electron Microscope） and atomic force microscope（AFM）for analysis. It was found that specimen had austenite grains and grain boundary. The surface roughness was 61 ± 14.3 nm. Thin films attached on the rough surface, but the grooves caused by grain boundary were not filled in completely. There were also some gap between thin film and substrate. After being cut and polished, some film peeled off. However, grains produced by this technique could be small as 15 nm. With the same evaporation source, the higher deposition rate made the grain size larger. The surface roughness was greater, too. Furthermore, we also confirmed that no change in the surface roughness after coating.
|Appears in Collections:||臨床牙醫學研究所|
Files in This Item:
|5.34 MB||Adobe PDF|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.