CoCrMo合金在三种环境中的扭转复合微动磨损特性研究
发布时间：2019-05-28 01:26
【摘要】：工业中实际的微动工况十分复杂,集两种或两种以上微动基本模式复合的复杂运动也经常出现,扭转(扭动+转动)复合微动是扭动微动和转动微动两种模式的耦合,是在交变载荷作用下接触副发生微幅扭转的相对运动。扭转复合微动磨损大大缩短了零部件的服役寿命,并且直接影响了安全生产,同时也带来了巨大的经济损失。扭转复合微动在人工关节植入、口腔修复种植、骨折内固定器件等情况下广泛存在,可目前少有人对扭转复合微动磨损进行研究。 本文选取CoCrMo合金球头与CoCrMo平面试样作为试验对磨副,在法向载荷Fn=25N,扭转复合角主要在a=10°和a=40°,角位移幅值主要在0=0.25°、0.5°、1°和2°的试验参数下,用25%血清溶液和人工关节液分别模拟其工作环境并同时对比其干态下的微动行为进行了扭转复合微动磨损特性研究。在详细分析微动接触条件下动力学的基础上,结合扫描电子显微镜(SEM)、光学显微镜(OM)、电子能谱(EDX)和表面轮廓仪对磨斑进行微观分析,探讨了CoCrMo合金扭转复合微动微动的运行行为和磨损机制,得出了以下结论： 1、CoCrMo合金球/平面配副在血清溶液、干态和人工关节液三种环境中的摩擦力-角位移幅值曲线都存在三种基本类型：直线型、椭圆型和平行四边形型。 2、建立了CoCrMo合金以扭转复合角和角位移幅值为变量的扭转复合微动运行工况图,并发现血清溶液和人工关节液中两种环境中的微动比干态下更易滑动。 3、CoCrMo合金扭转复合微动的摩擦系数和摩擦耗散能强烈依赖于扭转复合角、角位移幅值和循环周次。 4、研究表明扭转复合角a、角位移幅值0和循环次数Cycle强烈影响血清溶液和人工关节液中CoCrMo合金扭转复合微动的磨损行为：血清中--(1)部分滑移区：磨斑呈现中心黏着边缘微滑的环状,接触中心几乎没有损伤,磨斑的形貌呈现非对称性,此时的磨损机制主要为磨粒磨损和极其轻微的氧化磨损。(2)混合区：磨斑中心黏着状态减弱,损伤加剧,随着循环的进行,接触界面间的相对运动有由部分滑移状态转变为完全滑移状态的趋势,此时的磨损机制仍主要为氧化磨损和磨粒磨损。(3)滑移区：整个接触区域发生了剧烈的塑性变形,损伤严重并伴随大量的磨屑生成,而扭转复合角对磨屑的分布情况有非常重要的影响,且随着扭转复合角的增加,磨斑所表现出的损伤形貌出现转动微动的特征,此时的磨损机制主要为氧化磨损、磨粒磨损和一定量的剥层。人工关节液中--(1)部分滑移区：磨斑呈现中心黏着边缘微滑的环状磨损,接触中心由于黏着几乎没有损伤,磨斑周围可看到少量磨屑,而此时的磨损机制主要为磨粒磨损和极其轻微的氧化磨损。(2)混合区：磨斑中心损伤剧烈,并且随着循环的进行,接触界面间的相对运动有由部分滑移状态转变为完全滑移状态的趋势,此时的磨损机制仍主要为氧化磨损、磨粒磨损以及剥层。(3)滑移区：整个接触区域发生了剧烈的塑性变形,损伤严重并伴随大量的磨屑生成,磨屑颗粒致使接触面可以看到犁削作用的痕迹,而扭转复合角对磨屑的分布情况有非常重要的影响,且随着扭转复合角的增加,磨斑所表现出的损伤形貌出现转动微动的特征,此时的磨损机制同混合区相同。
[Abstract]:The actual micro-motion condition in the industry is very complex, and the complex motion of the combination of two or more kinds of micro-motion basic modes is also common, and the twisting (twisting + rotation) composite micro-motion is the coupling of the two modes of twisting and micro-motion, Is the relative movement of the contact pair under the action of alternating load. The torsional composite fretting greatly shortens the service life of the parts and directly influences the safety production, and also brings great economic loss. The torsion composite micro-motion is widely existed in the case of artificial joint implantation, oral repair planting, internal fixation device, and so on. In this paper, the ball of CoCrMo alloy and the plane of CoCrMo are selected as the pair of test pairs. In the normal load Fn = 25N, the torsion compound angle is mainly at a = 10 掳 and a = 40 掳, and the angular displacement amplitude is mainly at the test parameters of 0 = 0.25 掳, 0.5 掳,1 掳 and 2 掳. At the same time, the fretting behavior of the composite fretting wear was investigated by using 25% serum solution and artificial joint fluid to simulate the working environment and the micromotion in the dry state. In this paper, on the basis of detailed analysis of the dynamics of fretting contact conditions, the microanalysis of the grinding spot by scanning electron microscope (SEM), optical microscope (OM), electron energy spectrum (EDX) and surface profile meter is carried out, and the operation behavior and wear of the CoCrMo alloy torsional composite micro-motion are discussed. The following knot is obtained. The three basic types of friction-angular displacement amplitude curve in the three environments of serum solution, dry state and artificial joint liquid are three basic types: linear, elliptic and parallel four. Edge shape.2. CoCrMo alloy is established to reverse the composite micro-motion operation condition of the composite angle and the angular displacement amplitude as the variable, and the micro-movement ratio in both the serum solution and the artificial joint liquid is found to be dry. the friction coefficient and the friction dissipation of the torsional composite micro-motion of the CoCrMo alloy strongly depend on the twist compound angle, the angular displacement, The results show that the torsional compound angle a, the angular displacement amplitude of 0 and the number of cycles Cycle strongly influence the wear behavior of the CoCrMo alloy in the serum solution and the artificial joint liquid. The ring-shaped, contact center of the micro-sliding of the adhesive edge has little damage, and the appearance of the grinding spot is non-symmetrical, and the wear mechanism at this time is mainly the abrasive wear of the abrasive grains. (2) mixing zone: the adhesion state of the center of the grinding spot is weakened, the damage is increased, and the relative movement between the contact interfaces is changed from the partial slip state to the completely slip state as the circulation progresses, and the wear mechanism is still mainly Oxidation wear and abrasive wear. (3) Sliding zone: The whole contact area has severe plastic deformation, the damage is serious and is accompanied by a large amount of wear, and the twist compound angle has a very important influence on the distribution of the abrasive dust, and with the With the increase of the twist compound angle, the damage appearance of the wear spot is characterized by the rotation and micro-motion. At this time, the wear mechanism is mainly the oxidation wear, the abrasive grain, Wear and a certain amount of stripping.--(1) Partial slip zone in the joint fluid--(1) Partial slip zone: the wear spot presents an annular wear at the center of the adhesion edge of the center, the contact center can see a small amount of wear due to the adhesion, and the wear mechanism at this time is mainly abrasive wear and wear. very slight oxidative wear. (2) The mixing zone: the center of the grinding spot is severely damaged, and as the circulation progresses, the relative movement between the contact interfaces has a tendency to transition from a partial slip state to a fully slip state, at which time the wear mechanism is still mainly oxidized and worn and the abrasion of the abrasive grains and the peeling of the layer. (3) the sliding area: the whole contact area is subjected to severe plastic deformation, the damage is serious and is accompanied by a large amount of abrasion, the abrasive particles cause the contact surface to see the trace of the action of the plough, and the distribution of the twist compound angle to the grinding chip It has a very important influence, and with the increase of the twist compound angle, the damage appearance of the wear spot has the characteristic of rotating and micro-motion, at this time the grinding
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH117
[Abstract]:The actual micro-motion condition in the industry is very complex, and the complex motion of the combination of two or more kinds of micro-motion basic modes is also common, and the twisting (twisting + rotation) composite micro-motion is the coupling of the two modes of twisting and micro-motion, Is the relative movement of the contact pair under the action of alternating load. The torsional composite fretting greatly shortens the service life of the parts and directly influences the safety production, and also brings great economic loss. The torsion composite micro-motion is widely existed in the case of artificial joint implantation, oral repair planting, internal fixation device, and so on. In this paper, the ball of CoCrMo alloy and the plane of CoCrMo are selected as the pair of test pairs. In the normal load Fn = 25N, the torsion compound angle is mainly at a = 10 掳 and a = 40 掳, and the angular displacement amplitude is mainly at the test parameters of 0 = 0.25 掳, 0.5 掳,1 掳 and 2 掳. At the same time, the fretting behavior of the composite fretting wear was investigated by using 25% serum solution and artificial joint fluid to simulate the working environment and the micromotion in the dry state. In this paper, on the basis of detailed analysis of the dynamics of fretting contact conditions, the microanalysis of the grinding spot by scanning electron microscope (SEM), optical microscope (OM), electron energy spectrum (EDX) and surface profile meter is carried out, and the operation behavior and wear of the CoCrMo alloy torsional composite micro-motion are discussed. The following knot is obtained. The three basic types of friction-angular displacement amplitude curve in the three environments of serum solution, dry state and artificial joint liquid are three basic types: linear, elliptic and parallel four. Edge shape.2. CoCrMo alloy is established to reverse the composite micro-motion operation condition of the composite angle and the angular displacement amplitude as the variable, and the micro-movement ratio in both the serum solution and the artificial joint liquid is found to be dry. the friction coefficient and the friction dissipation of the torsional composite micro-motion of the CoCrMo alloy strongly depend on the twist compound angle, the angular displacement, The results show that the torsional compound angle a, the angular displacement amplitude of 0 and the number of cycles Cycle strongly influence the wear behavior of the CoCrMo alloy in the serum solution and the artificial joint liquid. The ring-shaped, contact center of the micro-sliding of the adhesive edge has little damage, and the appearance of the grinding spot is non-symmetrical, and the wear mechanism at this time is mainly the abrasive wear of the abrasive grains. (2) mixing zone: the adhesion state of the center of the grinding spot is weakened, the damage is increased, and the relative movement between the contact interfaces is changed from the partial slip state to the completely slip state as the circulation progresses, and the wear mechanism is still mainly Oxidation wear and abrasive wear. (3) Sliding zone: The whole contact area has severe plastic deformation, the damage is serious and is accompanied by a large amount of wear, and the twist compound angle has a very important influence on the distribution of the abrasive dust, and with the With the increase of the twist compound angle, the damage appearance of the wear spot is characterized by the rotation and micro-motion. At this time, the wear mechanism is mainly the oxidation wear, the abrasive grain, Wear and a certain amount of stripping.--(1) Partial slip zone in the joint fluid--(1) Partial slip zone: the wear spot presents an annular wear at the center of the adhesion edge of the center, the contact center can see a small amount of wear due to the adhesion, and the wear mechanism at this time is mainly abrasive wear and wear. very slight oxidative wear. (2) The mixing zone: the center of the grinding spot is severely damaged, and as the circulation progresses, the relative movement between the contact interfaces has a tendency to transition from a partial slip state to a fully slip state, at which time the wear mechanism is still mainly oxidized and worn and the abrasion of the abrasive grains and the peeling of the layer. (3) the sliding area: the whole contact area is subjected to severe plastic deformation, the damage is serious and is accompanied by a large amount of abrasion, the abrasive particles cause the contact surface to see the trace of the action of the plough, and the distribution of the twist compound angle to the grinding chip It has a very important influence, and with the increase of the twist compound angle, the damage appearance of the wear spot has the characteristic of rotating and micro-motion, at this time the grinding
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH117
【参考文献】
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