本文選題：DLC薄膜 + Ti6Al4V合金　； 參考：《中國礦業(yè)大學(xué)》2016年博士論文

【摘要】：隨著醫(yī)用人體植入材料的迅速發(fā)展,人工關(guān)節(jié)置換技術(shù)逐漸成為恢復(fù)患者關(guān)節(jié)功能和解除患者痛苦的重要醫(yī)療手段。迄今為止,對(duì)人工關(guān)節(jié)的研究主要集中在髖、膝關(guān)節(jié),頸椎關(guān)節(jié)的研究文獻(xiàn)和數(shù)據(jù)較少,更缺少對(duì)其生物摩擦學(xué)行為和磨損機(jī)理的系統(tǒng)研究。隨著頸椎病發(fā)病群體的日益年輕化,對(duì)人工頸椎間盤的使用壽命提出了更高的要求,因此,本文模擬人工頸椎間盤的屈/伸、側(cè)彎和軸向旋轉(zhuǎn)運(yùn)動(dòng),系統(tǒng)的研究了人工頸椎間盤材料在不同運(yùn)動(dòng)形式下的生物摩擦學(xué)行為,探索不同運(yùn)動(dòng)形式間的交互作用機(jī)理,因此其研究具有重要的理論研究意義。本文采用非平衡磁控濺射與離子注入耦合技術(shù),在Ti6Al4V合金基體表面沉積含氫類金剛石碳膜(DLC薄膜),對(duì)DLC薄膜的硬度、結(jié)構(gòu)、形貌、潤濕性等基本性能進(jìn)行表征,利用多自由度材料磨損試驗(yàn)機(jī)對(duì)DLC薄膜在多種運(yùn)動(dòng)模式下的生物摩擦性能進(jìn)行研究,并且結(jié)合有限元仿真模擬分析DLC薄膜的力學(xué)行為及磨損機(jī)理,獲得了如下主要結(jié)論:采用高溫?zé)釅撼尚头椒ㄖ苽涑叻肿恿烤垡蚁?UHMWPE)球冠,陽極型離子源結(jié)合非平衡磁控濺射復(fù)合技術(shù)與離子注入耦合的方法在Ti6Al4V合金表面沉積DLC薄膜。通過拉曼光譜和X射線光電子能譜分析薄膜特性,薄膜呈現(xiàn)出典型的類金剛石薄膜特征,DLC改性后的Ti6Al4V合金表面粗糙度從0.40μm降低到0.28μm,表面硬度提高了129%,表面接觸角為37.41°,在小牛血清溶液中具有較好的浸潤性。DLC薄膜與基體表面結(jié)合緊密,厚度均勻,達(dá)到2μm,未見明顯的裂紋。模擬人工頸椎間盤的屈/伸和側(cè)彎運(yùn)動(dòng),開展擺動(dòng)摩擦學(xué)試驗(yàn),隨著軸向載荷及擺動(dòng)角位移的增加,DLC薄膜的摩擦系數(shù)逐漸增大,UHMWPE的磨損量及磨損表面的粗糙度也隨之增加,與未改性的Ti6Al4V合金相比,DLC薄膜改性后的Ti6Al4V合金具有更好的耐磨性,接觸界面間摩擦力降低了77.6%,磨損量降低了11.2%。未改性Ti6Al4V合金的磨損機(jī)制以嚴(yán)重的磨粒磨損為主,經(jīng)DLC薄膜改性后的鈦合金的磨損形式以磨粒磨損和粘著磨損為主,大載荷、大角位移條件下,DLC薄膜局部區(qū)域發(fā)生應(yīng)力脆斷,發(fā)生脆性剝落。模擬頸椎間盤的軸向旋轉(zhuǎn)運(yùn)動(dòng),開展轉(zhuǎn)動(dòng)摩擦學(xué)試驗(yàn),隨著軸向載荷、轉(zhuǎn)動(dòng)角位移的增大,摩擦扭轉(zhuǎn)力矩、摩擦耗散能、磨損量均呈現(xiàn)出增大的趨勢(shì)。與未改性的Ti6Al4V合金相比,DLC薄膜改性后的Ti6Al4V合金具有更好的耐磨性,進(jìn)入完全滑移狀態(tài)的時(shí)間縮短,接觸界面間摩擦扭轉(zhuǎn)力矩顯著降低。未改性Ti6Al4V合金的磨損機(jī)制表現(xiàn)為嚴(yán)重的磨粒磨損,經(jīng)DLC薄膜改性后的鈦合金的磨損形式以應(yīng)力集中產(chǎn)生的脆性剝落為主。DLC薄膜增大了對(duì)磨副UHMWPE的磨損,UHMWPE的磨損機(jī)制是粘著磨損和磨粒磨損綜合作用的結(jié)果。與Ti6Al4V合金的擺-轉(zhuǎn)復(fù)合摩擦對(duì)比,擺動(dòng)摩擦系數(shù)低于復(fù)合摩擦系數(shù),轉(zhuǎn)動(dòng)摩擦扭轉(zhuǎn)力矩大于復(fù)合摩擦扭轉(zhuǎn)力矩;不同摩擦狀態(tài)下對(duì)磨副UHMWPE的磨損量呈現(xiàn)出擺動(dòng)復(fù)合轉(zhuǎn)動(dòng)的趨勢(shì);擺動(dòng)和轉(zhuǎn)動(dòng)表現(xiàn)為相互制約的關(guān)系。與DLC薄膜改性后Ti6Al4V合金的擺-轉(zhuǎn)復(fù)合摩擦對(duì)比,擺動(dòng)摩擦系數(shù)低于復(fù)合摩擦系數(shù),轉(zhuǎn)動(dòng)摩擦扭轉(zhuǎn)力矩大于復(fù)合摩擦扭轉(zhuǎn)力矩;不同摩擦狀態(tài)下對(duì)磨副UHMWPE的磨損量呈現(xiàn)出轉(zhuǎn)動(dòng)復(fù)合擺動(dòng)的趨勢(shì)。在低周、高周循環(huán)條件下,DLC薄膜的摩擦系數(shù)、扭轉(zhuǎn)力矩和對(duì)磨副UHMWPE的磨損量均明顯低于Ti6Al4V合金配副;DLC薄膜球窩中心區(qū)域的磨損機(jī)制為粘著磨損,球窩邊緣區(qū)域的磨損機(jī)制則為磨粒磨損;Ti6Al4V合金球窩的磨損機(jī)制則均為磨粒磨損。有限元仿真結(jié)果表明,在擺動(dòng)摩擦?xí)r,隨著軸向載荷、擺動(dòng)角位移的增大,摩擦剪切應(yīng)力逐漸增大,DLC薄膜球窩的變形量隨之增大,且平行于擺動(dòng)摩擦方向的變形量大于垂直于擺動(dòng)摩擦方向的變形量。DLC薄膜球窩中心區(qū)域的DLC薄膜易產(chǎn)生摩擦疲勞,最終引起DLC薄膜的破裂,局部區(qū)域發(fā)生脆性剝落。在轉(zhuǎn)動(dòng)摩擦?xí)r,DLC薄膜球窩的中心均出現(xiàn)粘著區(qū),DLC薄膜球窩的旋轉(zhuǎn)運(yùn)動(dòng)處于粘滑混合區(qū),并且隨著載荷、轉(zhuǎn)動(dòng)角位移的增大,相對(duì)滑移區(qū)域的面積增大,人工頸椎間盤接觸界面間的接觸應(yīng)力及摩擦剪切應(yīng)力逐漸增大,DLC薄膜球窩接觸邊緣的磨損愈加嚴(yán)重,導(dǎo)致材料的損失也愈加嚴(yán)重。
[Abstract]:With the rapid development of medical human implant materials, artificial joint replacement has gradually become an important medical means to restore the joint function and relieve the pain of the patients. So far, the research of artificial joints is mainly focused on the hip, knee joint and cervical joint. A systematic study of the mechanism of wear and tear. With the growing youth of the cervical spondylosis group, a higher requirement for the life of the artificial cervical disc is put forward. Therefore, this paper simulates the flexion / extension, lateral bending and axial rotation of the artificial cervical disc, and studies the biological tribological behavior of the artificial cervical disc material under different motion forms. In order to explore the interaction mechanism between different forms of motion, the research has important theoretical significance. In this paper, the hydrogen like diamond carbon film (DLC film) was deposited on the surface of Ti6Al4V alloy by non-equilibrium magnetron sputtering and ion implantation, and the basic properties of the hardness, structure, morphology and wettability of DLC thin films were carried out. A multi degree of freedom material wear test machine was used to study the biological friction properties of DLC film under a variety of motion modes, and the mechanical behavior and wear mechanism of DLC film were analyzed by finite element simulation. The following main conclusions were obtained: the high molecular weight polyethylene (UHMWPE) ball crown was prepared by high temperature hot pressing. The DLC film was deposited on the surface of Ti6Al4V alloy by the anode type ion source combined with the nonequilibrium magnetron sputtering composite technology and ion implantation. Through the Raman spectroscopy and X ray photoelectron spectroscopy, the film features a typical diamond like film. The surface roughness of the Ti6Al4V alloy after DLC modification is reduced from 0.40 to 0. The surface hardness of.28 mu m is increased by 129% and the surface contact angle is 37.41 degrees. The better infiltrative.DLC film in the calf serum solution is close to the surface of the matrix, the thickness is equal to 2 mu m, and no obvious crack is found. The motion of the flexion / extension and lateral bending of the artificial cervical intervertebral disc is simulated, and the swinging tribological test is carried out with the axial load and the swing angle. With the increase of displacement, the friction coefficient of DLC film increases gradually, the wear amount of UHMWPE and the roughness of the worn surface also increase. Compared with the unmodified Ti6Al4V alloy, the Ti6Al4V alloy after the modified DLC film has better wear resistance, the friction force between the contact interfaces is reduced by 77.6%, and the wear amount of the 11.2%. unmodified Ti6Al4V alloy is reduced. The damage mechanism is mainly abrasive wear. The wear form of titanium alloy modified by DLC film is mainly abrasive wear and adhesion wear. Under large load and large angle displacement, the stress embrittlement and brittle exfoliation occur in the local area of DLC film. The axial rotation movement of the cervical intervertebral disc is simulated, the rotational tribological test is carried out, along with the axial load. The increase of the angular displacement, the torque torque, the friction dissipation energy and the wear amount all show an increasing trend. Compared with the unmodified Ti6Al4V alloy, the Ti6Al4V alloy modified by DLC film has better wear resistance, the time to enter the state of complete slip is shortened, and the torque torque between the contact interface is significantly reduced. The unmodified Ti6Al4V The wear mechanism of the alloy is characterized by serious abrasive wear. The wear form of the titanium alloy after the modification of the DLC film is mainly brittle exfoliation produced by the stress concentration in the.DLC film, which increases the wear of the grinding pair UHMWPE. The wear mechanism of the UHMWPE is the result of the combined effect of adhesion and abrasive wear. In contrast, the coefficient of swing friction is lower than the compound friction coefficient, and the torsion moment of rotational friction is greater than that of composite friction torsional moment; the wear of the grinding pair UHMWPE exhibits a trend of swinging compound rotation under different friction states; the relationship between swing and rotation is mutually restricted. The comparison of the pendulum and rotation friction between the DLC thin film and the Ti6Al4V alloy after the modification of the thin film is made. The coefficient of wobble friction is lower than the compound friction coefficient, and the torsion moment of rotational friction is greater than that of the composite friction torque. The wear of the grinding pair UHMWPE under different friction states shows a trend of rotational and compound oscillating. Under low cycle and high cycle conditions, the friction coefficient, torsional moment and wear of the grinding pair UHMWPE are obviously lower than Ti under the condition of low cycle and high cycle cycle. The wear mechanism of the center region of the DLC film is adhesive wear, and the wear mechanism of the edge area of the spherical dimple is abrasive wear, and the wear mechanism of the Ti6Al4V alloy ball socket is abrasive wear. The finite element simulation results show that the friction shear stress gradually increases with the increase of the axial load and the swing angle displacement during the swing friction. In addition, the deformation of the DLC film spherical dimple increases, and the deformation amount parallel to the direction of swinging friction is greater than that of the central region of the.DLC film's center area, which is perpendicular to the direction of the swinging friction. The DLC film of the center area of the spherical dimple of the.DLC film is easy to produce friction fatigue, which eventually causes the rupture of the thin film and the brittle exfoliation in the local region. In the rotational friction, the middle of the DLC film ball is in the middle. The rotation movement of the DLC film ball is in the stick slip zone, and with the load, the angular displacement increases and the area of the relative slip area increases. The contact stress and the friction shear stress between the contact interface of the artificial cervical disc increase gradually, and the wear of the contact edge of the DLC film ball is becoming more and more serious, leading to the material. The loss is getting worse.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG174.4;R318.08

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2 劉侃;α-Fe_2O_3薄膜的表面修飾及其光電催化性能研究[D];天津理工大學(xué);2015年

3 李曉婷;入射光和結(jié)構(gòu)色耦合效應(yīng)對(duì)彩色Ti0_2薄膜上客體分子的光富集作用[D];上海師范大學(xué);2015年

4 劉文龍;Bi_(1-x)RE_xFe_(1-y)TM_yO_3/NiFe_2O_4（RE=Sm,Sr;TM=Cr,Mn）薄膜的制備及多鐵性研究[D];陜西科技大學(xué);2015年

5 吳曉平;基于層層自組裝法制備CNT薄膜及其壓阻傳感性能研究[D];青島理工大學(xué);2015年

6 史志天;化學(xué)氣相沉積法制備二硫化鉬薄膜及電學(xué)性能表征[D];北京有色金屬研究總院;2015年

7 溫占偉;基于CuPc的有機(jī)二極管與場(chǎng)效應(yīng)管薄膜封裝技術(shù)研究[D];蘭州大學(xué);2015年

8 何維;完全醇解型PVA包裝薄膜的耐水性研究[D];湖南工業(yè)大學(xué);2015年

9 陳德方;PET基透明柔性LaB_6薄膜的制備及其光學(xué)性能研究[D];山東大學(xué);2015年

10 朱泯西;激光轉(zhuǎn)移銅錫單IMC薄膜工藝及與銅錫薄膜界面行為[D];哈爾濱工業(yè)大學(xué);2015年

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