頁籤選單縮合
題 名 | 超高分子聚乙烯人工髖臼杯之表面機械性質強化=Surface Strengthening on UHMW Polyethylene Acetabular Cup |
---|---|
作 者 | 廖峻德; 陳文彬; 王明誠; | 書刊名 | 中華醫學工程學刊 |
卷 期 | 18:2 1998.06[民87.06] |
頁 次 | 頁139-145 |
分類號 | 410.1644 |
關鍵詞 | 超高分子聚乙烯; 氮離子注入; 表面強化; 磨耗; UHMW polyethylene; Ion implantation; Surface strengthening; Wear; |
語 文 | 中文(Chinese) |
中文摘要 | 改善人工髖關節產品的耐磨性質、減少磨損殘屑的產生,可以增進髖臼--球長期 的生物相容性。以磨耗力學之相對磨損性而言:改善的效果宜以髖臼 -- 球之間的相對機械性 質變化做探討。本系列研究之一部分:超高分子聚乙烯髖臼杯表面的改質,乃利用加速之氮 離子注入較低硬度、 滯塑性之聚乙烯材質。 由多項材質分析與模擬磨耗研究得知: 以 103�Bions.cm 的氮離子注入聚乙烯,可使聚乙烯表層具有較高的硬度與類彈性性質 (如同具有 墊的作用 )。 氮離子不與高分子鏈作用 (經 XPS 測試 ),並且不影響材質表面外觀與原有 聚乙烯的結構。 此處理層約 500mm,機械性質呈分佈曲線的強度變化:如以 10�Bions.cm 的 劑量計,外層硬度可增強至 8 倍。 此明顯縮小與金屬或陶瓷髖球頭在機械性質上的差異, 有利改善兩磨損表面的相對機械性質。聚乙烯強化的原因目前認為:加速離子注入高分子基 ,累積於表層,使大量斷解的分子鏈,立即形成交錯連結,而使之漸成堅固之三維網狀結構 。 |
英文摘要 | To improve long-term biocompatibility of hip prosthetic products, much effort is employed to modify their wear resistance and to reduce the generation of wear debris at contact surfaces. Viewing from the mechanics of wear-the articulating. surfaces, the role of their relative mechanical properties should be reconsidered. A part of our sequential studies: modification of UHMW polyethylene acetabular cup is performed by nitrogen ion implantation. With appropriate implantation doses, e.g. 10�B ions.cm, onto the surface, followed by surface analyses and related simulations, an obvious modification has been found: such ion-implanted layer is estimated up to 500 nm of depth; it creates a diffused layer that is elastically hardened. The nano-hardness shows a distribution curve, with the increase of ca. 8 times for the dose of 10�B ions.cm. It has significantly reduced the difference of mechanical properties with the abrasive part. The transformatio nof its mechanical resistance is correlated with the formation of cross-linked polymeric structures, which are likely 3-D networks localized at the outmost surface. |
本系統中英文摘要資訊取自各篇刊載內容。