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              26

              2021-07


              論文導讀 γ輻照誘導表面氧化對聚醚醚酮(PEEK)摩擦學性能的影響
              點擊量:208 關鍵詞:聚泰新材料 發布者:
                論文摘自期刊Polymer Bulletin,創刊于1978年,由Springer Berlin Heidelberg出版公司出版??莵碜允澜绺鲊木哂袆撔滦缘母哔|量論文、研究快報、特約綜述等,內容主要覆蓋為化學-高分子科學。最新SCI影響因子為2.87,入選中科院期刊分區4區。
                γ輻照誘導表面氧化對聚醚醚酮(PEEK)摩擦學性能的影響
                Infuence of gamma irradiation?induced surface oxidation on tribological property of polyetheretherketone (PEEK)
                Liqiang Chai,Beibei Zhang,Li Qiao,Peng Wang,Lijun Weng
                DOI:10.1007/s00289-021-03825-4
                文章鏈接:
                https://link.springer.com/article/10.1007/s00289-021-03825-4
                摘要:
                本文研究了被劑量高達20MGy的伽馬射線照射過后的半結晶材料PEEK表面降解和內部結構變化對其摩擦學行為的影響。通過X射線光電子能譜分析發現受照射的PEEK樣品表面上C=O和O-C=O官能團的百分比含量增加,這表明PEEK表面降解主要形式是輻射誘導的氧化導致的。通過掃描電鏡結果發現,當輻照劑量超過10 MGy時,PEEK樣品會出現微孔、微裂紋等表面形貌缺陷,同時摩擦實驗發現,由于表面氧化層的存在,輻照后的PEEK表面靜摩擦系數增大。此外,當劑量超過1MGy時,輻照后PEEK表面的穩態動摩擦系數逐漸降低。表面氧化產物起三體滾動作用,導致動摩擦系數下降。然而,與未輻照樣品相比,相應的磨損率增加了一個數量級。
                關鍵詞:伽馬輻照;表面氧化;PEEK;摩擦磨損
                Abstract:
                In this paper, the semicrystalline PEEK was irradiated in the atmosphere by gamma rays with a dose up to 20 MGy. The influence of the surface degradation and the internal structural changes on the tribological behavior of PEEK was investigated. X-ray photoelectron spectroscopy analysis shows an increase in the percentage of C=O and O–C=O functional groups on the surface of irradiated PEEK samples. It reveals that irradiation-induced oxidation is the primary form of degradation on the PEEK surface. Scanning electron microscopy results indicate that the surface morphology defects such as micropores and microcracks appear when the irradiation dose exceeds 10 MGy. The friction experiments show that the static friction coefficient of the irradiated PEEK surface increases due to the existence of the surface oxide layer, and the appearance of a shorter run-in period attributes to the formation of uniform and stable transfer film in the initial stage of friction. In addition, when the dose is more than 1 MGy, the steady-state dynamic friction coefficient of the irradiated PEEK surface gradually decreases. The surface oxidation products play a rolling effect of three bodies, resulting in the fall of the dynamic friction coefficient. However, the corresponding wear rate increases by one order of magnitude compared to that of the unirradiated sample.
                Keywords:Gamma irradiation;Surface oxidation;PEEK;Friction and wear
              圖1 原始和 20 MGy 劑量輻照 PEEK 的表面和轉移膜的拉曼光譜
              圖2 不同輻射劑量前后PEEK去除氧化層的磨損率
              圖3 不同輻照劑量去除氧化層前后PEEK的平均穩態摩擦系數。插圖顯示去除氧化層前后PEEK a和b的相應摩擦系數曲線
                結論:
                在這項工作中,研究了環境空氣中高達20MGy劑量的伽馬射線輻照PEEK的表面和內部結構的變化。還詳細討論了伽馬輻射引起的表面降解對PEEK摩擦學性能的影響??梢缘贸鲆韵陆Y論:
                1.輻射引起的氧化是PEEK表面降解的主要形式。隨著輻照劑量的增加,表面出現氧化降解層,表面形貌缺陷增多。
                2.力學性能測試表明,輻照氧化導致PEEK表面硬度降低。
                3.摩擦結果表明,輻照氧化導致靜摩擦系數增大,動摩擦系數減小。表面氧化產物起三體滾動作用,導致動摩擦系數下降。
                4.輻照后PEEK的磨損率在1MGy以上時增加。輻照誘導的表面微缺陷和氧化簇引起的磨粒磨損導致輻照后 PEEK 在高劑量下的耐磨性下降。
                Conclusions:
                In this work, the changes of surface and internal structure of PEEK irradiated by gamma ray up to 20 MGy dose in the ambient air are studied. The infuence of gamma irradiation-induced surface degradation on tribological property of PEEK is also discussed in detail. The conclusions can be drawn as follows:
                1. Irradiation-induced oxidation is the primary form of degradation on the PEEK surface. As the irradiation dose increases, surface oxidation degradation layers appear and the surface morphology defects increase.
                2. The mechanical performance test shows that irradiation-induced oxidation results in a decrease in the surface hardness of PEEK.
                3. The friction results show that the irradiation-induced oxidation leads to an increase in the static friction coefcient and a decrease in the dynamic friction coefcient. The surface oxidation products play a rolling efect of three-body resulting in the fall of the dynamic friction coefcient.
                4. The wear rate of the irradiated PEEK increases when the dose is more than 1 MGy. Irradiation-induced surface microdefects and the abrasive wear caused by oxidized clusters result in the deterioration of wear resistance of the irradiated PEEK at high doses.
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