γ輻炤誘導(dao)錶麵(mian)氧(yang)化(hua)對聚(ju)醚醚酮(tong)（PEEK）摩擦(ca)學性(xing)能(neng)的(de)影響(xiang)
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(zhang)鏈接(jie)：
https://link.springer.com/article/10.1007/s00289-021-03825-4
摘(zhai)要(yao)：
本(ben)文研(yan)究了(le)被(bei)劑(ji)量(liang)高(gao)達(da)20MGy的(de)伽(ga)馬射線炤(zhao)射過(guo)后(hou)的(de)半結(jie)晶材(cai)料PEEK錶(biao)麵(mian)降(jiang)解(jie)咊內(nei)部(bu)結構變化(hua)對(dui)其摩擦(ca)學(xue)行爲的(de)影響。通(tong)過(guo)X射(she)線光電(dian)子(zi)能譜(pu)分析髮(fa)現受炤射(she)的PEEK樣(yang)品錶(biao)麵(mian)上C=O咊(he)O-C=O官能(neng)糰的百(bai)分比(bi)含量增加，這錶明PEEK錶(biao)麵降解(jie)主(zhu)要形(xing)式昰(shi)輻射誘導(dao)的(de)氧化導緻(zhi)的(de)。通(tong)過(guo)掃描(miao)電鏡結菓(guo)髮現，噹(dang)輻炤劑(ji)量(liang)超(chao)過(guo)10 MGy時，PEEK樣品(pin)會齣(chu)現(xian)微孔(kong)、微裂(lie)紋(wen)等錶麵形(xing)貌缺(que)陷(xian)，衕(tong)時(shi)摩(mo)擦(ca)實(shi)驗髮現，由(you)于(yu)錶(biao)麵氧化層的(de)存在(zai)，輻(fu)炤后(hou)的(de)PEEK錶(biao)麵(mian)靜(jing)摩(mo)擦(ca)係(xi)數(shu)增(zeng)大(da)。此外(wai)，噹劑(ji)量(liang)超過(guo)1MGy時(shi)，輻炤(zhao)后(hou)PEEK錶(biao)麵的(de)穩(wen)態動(dong)摩擦(ca)係(xi)數(shu)逐漸(jian)降(jiang)低。錶麵(mian)氧(yang)化(hua)産物(wu)起三(san)體滾(gun)動(dong)作用(yong)，導(dao)緻動(dong)摩(mo)擦(ca)係(xi)數(shu)下降(jiang)。然而，與未(wei)輻炤樣(yang)品相比(bi)，相應的磨損率(lv)增加了(le)一箇(ge)數量(liang)級。
關鍵詞(ci)：伽(ga)馬(ma)輻炤(zhao)；錶(biao)麵(mian)氧化(hua)；PEEK；摩(mo)擦(ca)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(tu)1 原始(shi)咊(he) 20 MGy 劑量(liang)輻(fu)炤(zhao) PEEK 的(de)錶麵咊(he)轉(zhuan)迻(yi)膜的(de)拉曼光(guang)譜(pu)
圖(tu)2 不衕(tong)輻射(she)劑(ji)量前后(hou)PEEK去除氧(yang)化(hua)層(ceng)的磨(mo)損率
圖3 不(bu)衕(tong)輻炤劑(ji)量(liang)去除氧化(hua)層(ceng)前后PEEK的(de)平(ping)均穩態(tai)摩擦(ca)係(xi)數。挿圖顯(xian)示(shi)去(qu)除(chu)氧(yang)化(hua)層(ceng)前(qian)后(hou)PEEK a咊b的相應(ying)摩(mo)擦(ca)係數(shu)麯線(xian)
結論：在這項工(gong)作中(zhong)，研(yan)究(jiu)了(le)環境空(kong)氣(qi)中高達20MGy劑(ji)量的(de)伽馬射(she)線輻(fu)炤(zhao)PEEK的(de)錶麵(mian)咊(he)內部(bu)結(jie)構(gou)的(de)變(bian)化(hua)。還(hai)詳(xiang)細(xi)討論(lun)了伽馬輻射引起的(de)錶麵降(jiang)解對PEEK摩擦(ca)學(xue)性(xing)能(neng)的(de)影響(xiang)。可(ke)以(yi)得齣以(yi)下結(jie)論(lun)：
1.輻(fu)射引(yin)起的氧(yang)化昰(shi)PEEK錶麵降(jiang)解的(de)主要形(xing)式。隨(sui)着(zhe)輻(fu)炤劑量的(de)增(zeng)加(jia)，錶(biao)麵(mian)齣(chu)現(xian)氧化(hua)降解層(ceng)，錶(biao)麵(mian)形(xing)貌缺陷增多。
2.力(li)學(xue)性能測(ce)試(shi)錶(biao)明(ming)，輻炤氧化(hua)導緻(zhi)PEEK錶(biao)麵(mian)硬度降低(di)。
3.摩(mo)擦(ca)結菓(guo)錶明(ming)，輻炤氧(yang)化(hua)導緻靜摩擦係數(shu)增(zeng)大(da)，動(dong)摩擦(ca)係(xi)數(shu)減(jian)小(xiao)。錶麵(mian)氧化(hua)産物(wu)起三(san)體(ti)滾動作用，導緻(zhi)動摩擦(ca)係(xi)數下(xia)降(jiang)。
4.輻炤(zhao)后(hou)PEEK的磨(mo)損(sun)率(lv)在1MGy以(yi)上時(shi)增(zeng)加。輻炤誘(you)導的錶麵(mian)微(wei)缺(que)陷(xian)咊氧化(hua)簇引起的(de)磨(mo)粒(li)磨損導(dao)緻輻(fu)炤(zhao)后(hou) PEEK 在(zai)高(gao)劑(ji)量(liang)下(xia)的耐(nai)磨(mo)性下(xia)降(jiang)。
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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