锌铝合金和铝青铜摩擦磨损特性的研究

研究了锌铝合金ＺＡ－Ｓｉ和铝青铜ＺＣｕＡｌ１０Ｆｅ３在２０号机油润滑条件下的摩擦磨损特性。结果表明：在一定的条件下，ＺＡ－Ｓｉ合金的耐磨性能和磨合性能均明显优于ＺＣｕＡｌ１０Ｆｅ３合金；二种合金的磨损机制主要是犁削，辗压和粘着，ＺＡ－Ｓｉ合金的粘着磨损具有延缓性和失效性的双重特性。     

锌铝金（ZA27）润滑时摩擦损特性研究

本研究ＺＡ２７合金在润滑下的摩擦磨损特性。提出在油润滑下ＺＡ２７合金同材质摩擦时，磨损特点是边界润滑摩擦；其与４５钠配副摩擦时，摩擦特点主要的犁削。根据损失重分析得出；ＺＡ２７合金的润滑工况下是一种良好的减摩材料。     

铸造Grp／ZA27复合材料摩擦磨损行为研究

研究了不同含量Ｇｒｐ增强ＺＡ２７复合材料在不同载荷和滑速下的摩擦磨损行为,着重探讨了不同条件下磨损机制,结果表明Ｇｒｐ的加入明显提高了ＺＡ２７合金摩擦磨损性能,并随Ｇｒｐ含量的增加而提高,且在高载荷或高滑速下更显优越性,在不同载荷或滑速下复合材料的磨损机制截然不同。     

3Al2O3.2SiO2f／Al—Si复合材料磨损机理

本文通过复合材料磨面，磨屑及亚表层的ＳＥＭ特征分析，研究了３Ａｌ２Ｏ３．２ＳｉＯ２ｆ／Ａｌ－Ｓｉ复合材料的润滑衣干滑动磨损机理。润滑状态下复合材料的耐磨性大大优于Ａｌ－Ｓｉ合金，其磨损为纤维断裂与剥落及磨粒磨损；而复合材料在干滑动条件下的耐磨性反而稍差于Ａｌ－Ｓｉ合金，其磨损为粘着磨损，磨粒磨损和层离剥落。     

WC—NiP合金密封材料的摩擦磨损特性

本文对研究开发的一种机械密封新型摩擦副材料ＷＣ－ＮｉＰ合金的摩擦磨损特性进行了研究。考察了在水润滑条件下ＷＣ－ＮｉＰ／石墨配对的摩擦性能,以及在３％ＮａＣＬ和１０％ＨＣｌ溶液中的腐蚀磨损性能。并与ＷＣ－Ｃｏ合金作了对比。结果表明：在水及３％ＮａＣｌ溶液中两种ＷＣ材料有相近的摩擦磨损特性,而在１０％ＨＣｌ溶液中ＷＣ－ＮｉＰ合金的腐蚀磨损性能则远优于ＷＣ－Ｃｏ。     

13Cr-24Mn-0.44N奥氏体不锈钢在体液中腐蚀磨损特性研究

采用改进后的摩擦磨损试验机考察了13Cr－24Mn-0．44N不锈钢在模拟体液和水介质润滑条件下的摩擦磨损性能,研究了载荷大小和磨损时间对摩擦因数和磨损量的影响,用扫描电镜观察了磨痕的表面形貌。结果表明：13Cr．24Mn-0．44N不锈钢在体液润滑条件下具有良好的抗腐蚀磨损能力,单位时间的磨损量仅为水润滑条件下的25％左右,摩擦因数下降了近30％。     

润滑油添加剂对聚合物及其复事材料磨擦磨损性能的影响

利用ＭＨＫ－５００型环－块磨损试验机研究了二烷基二硫代磷酸锌（ＺＤＤＰ）对几种聚合物及其复材料－金属摩擦副油润滑摩擦磨损性能的影响。结果表明，液体石蜡中的ＺＤＤＰ对尼龙６６（ＰＡ６６）及聚酰亚胺（ＰＩ）－ＧＣｒ１５轴承钢摩擦副的摩擦系数影响不大，但却使聚四氟乙烯（ＰＴＦＥ）及其复合材料－ＧＣｒ１５轴承钢摩擦副的摩擦系数略有限低。ＰＴＦＥ及其复合材料－ＧＣｒ１５轴承钢摩擦副表面的ＺＤＤＰ吸附膜具有一     

全油膜润滑条件下磨粒磨损特性的实验研究

本文应用最新研制的ＭＭＵ－５型流体润滑摩擦磨损试验机，对全油膜润滑条件下三体磨粒磨损的特性进行了一些实验研究。     

青铜-石墨热喷涂层在干摩擦和水润滑条件下的摩擦磨损性能

在MM-200摩擦磨损试验机上研究了青铜-石墨热喷涂层在干摩擦和水润滑条件下的摩擦磨损性能,采用扫描电镜(SEM)对磨损表面形貌进行了观测和采用X射线能谱分析(XPS)分析了涂层成分。结果表明,在水润滑条件下涂层摩擦因数和磨损率均低于干摩擦条件下;在水润滑条件下磨损机制为轻微磨粒磨损和犁削磨损,在干摩擦下主要是较为严重的粘着磨损和犁削。这是由于水润滑降低了摩擦副界面温度,提高了石墨润滑膜的韧性,改善了润滑效果,从而阻止了粘着磨损的发生,水还促进了钢偶件表面致密氧化膜的形成,从而减轻磨损。因此水润滑对涂层磨损性能有较大影响。     

不同润滑介质下钢-钢摩擦副的摩擦磨损性能

研究了钢-钢摩擦副在干摩擦、水润滑、酒精润滑和60 N油润滑等条件下的摩擦磨损行为。结果表明:润滑介质可以显著降低钢-钢摩擦副的摩擦系数,在干摩擦、水润滑、酒精润滑和60N油润滑,摩擦载荷为(50～200)g(钢球半径为2 mm)时摩擦系数的平均值分别为0.75～0.81,0.45～0.33,0.22～0.15,0.13～0.09;在高载荷下酒精润滑与油润滑磨损速率相差甚小,并且在摩擦磨损初期阶段(500 s之内)摩擦系数相差甚少;同时,酒精润滑条件下的磨损表面形貌与油润滑下的磨损表面形貌极为相似,无明显粘着现象。分析表明,酒精润滑是一种绿色润滑介质,在压延、拉伸工业中有良好的应用前景。     

锌铝合金(ZA27)润滑时摩擦磨损特性研究

本文研究ZA27合金在润滑下的摩擦磨损特性。提出在油润滑下ZA27合金同材质摩擦时,磨损特点是边界润滑摩擦;其与45钢配副摩擦时,摩擦特点主要是犁削。根据磨损失重分析得出;ZA27合金在润滑工况下是一种良好的减摩材料。     

超声振动对不同黏度润滑油摩擦学性能的影响

研究GCr15/45#钢摩擦副在4种不同黏度的润滑油润滑时,有和无超声振动下的摩擦磨损性能,采用扫描电子显微镜分析磨痕表面形貌,探讨在不同黏度润滑油作用下,超声振动对润滑油摩擦学性能的影响机制。结果表明:超声振动对不同黏度润滑油摩擦学性能的影响是不同的;超声振动可以提高低黏度润滑油润滑的减摩抗磨性能,如在6#白油润滑时施加超声振动后,摩擦副间的摩擦因数和磨损体积分别减小了13.6%和17.5%;高黏度润滑油润滑时,超声振动会加剧摩擦副的摩擦磨损,如在150BS润滑时施加超声振动后,摩擦副间的摩擦因数和磨损体积分别增加了10.4%和50%。     

几种滑动轴承合金在油润滑条件下的磨损行为的研究

采用MPX-2000型摩擦试验机对研制的ZA30台金和ZA27、ZCuSn6Zn6Pb3、ZCuA110Fe3、ZCuSn10PI四种滑动轴承合金在46^#工业齿轮油润滑条件下的耐磨性能进行了对比试验,并在扫描电子显微镜上观察了磨损表面形貌,分析了磨损机制。结果表明：ZA30耐磨性能优于ZA27、ZCuSn10P1、ZCuSn6Zn6Pb3、ZCuA110Fe3;ZA30发生的是犁削磨损,ZA27、ZCuSn10P1主要是犁削磨损及轻微粘着磨损,ZCuA110Fe3发生的是剥落磨损,ZCuSr16Zn6Pb3发生的是粘着磨损。     

炭黑及丙烯腈含量对丁腈橡胶磨损机理的影响

丁腈橡胶是一种重要的螺杆泵定子材料.以不同炭黑及丙烯腈含量的丁腈橡胶与45#钢组成的摩擦副为研究对象,采用MPV-600型环-块摩擦磨损试验机,在干摩擦和原油润滑条件下进行摩擦磨损试验,对丁腈橡胶磨损量及摩擦系数进行分析,初步探讨了其磨损机理.从试验结果可以看出,干摩擦条件下丁腈橡胶的磨损量随着载荷的增大而增大,炭黑和丙烯腈含量的增加使丁腈橡胶的耐磨性增强.原油介质下的磨损规律与干摩擦基本相同,丁腈橡胶磨损表面平整,磨损量很小,且原油介质的润滑和冷却作用使橡胶的摩擦系数降低.     

The influence of alumina particle dispersion and test parameters on dry sliding wear behaviour of zinc-based alloy

The present investigation deals with dry sliding wear characteristics of a zinc-based alloy (ZA 37) with and without Al₂O₃ particle dispersion over a range of sliding speeds and applied pressures. The matrix alloy has been examined under identical test conditions in order to examine the role played by the second phase alumina particles on wear behaviour. The observed wear behaviour of the samples has been explained in terms of specific characteristics like cracking tendency, lubricating, load bearing and deformability characteristics, and thermal stability of various microconstituents. The nature of predominance of one set of parameters (causing higher wear rate) over the other (producing a reverse effect) was thought to actually control the wear behaviour. Examinations of the characteristic of wear surfaces and subsurface regions also enabled to understand the operating wear mechanism and to substantiate the wear behaviour.At low sliding speed, significantly lower wear rate of the matrix alloy over that of the composite was noticed. This has been attributed to increased microcracking tendency of the composite than the matrix alloy. Reduced wear rate and higher seizure pressure experienced by the composite over that of the matrix alloy at the higher sliding speeds could be explained to be due to enhanced compatibility of matrix alloy with dispersoid phase and greater thermal stability of the composite in view of the presence of the dispersoid. The maximum temperature rise due to frictional heating has been observed to be low in the case of matrix alloy than composite at low speed while the trend reversed at higher speeds. In general, the wear rate and temperature increased with applied pressure and speed. Seizure pressure reduced with increasing speed while the seizure resistance (pressure) of the matrix alloy was more adversely affected by speed than that of the composite.     

Fretting wear of carburized titanium alloy against ZrO2 under serum lubrication

Fretting wear of carburized titanium alloys was investigated on the universal multifunctional tester (UMT) with the ball-on-flat fretting style under bovine serum lubrication. The tangential load and friction coefficient during the fretting process were analyzed, and the evolution of fretting log during the fretting process was investigated to understand the wear mechanism of the titanium alloy and carburized titanium alloy. Furthermore, the wear scar was examined using a SEM and three-dimension surface profiler. It was found that the friction coefficient of the titanium alloy increased faster than that of carburized titanium alloy in the first stage under serum lubrication, and then remained steady with a similar value in the second stage. The Ft-D curve indicated that there was wear mechanism transition from gross slip to mixed stick and slip. Finally, it was observed that there was a slight damage of the titanium alloy and carburized titanium alloy showed excellent performance during the fretting wear process under serum lubrication. All of the results suggested that carburized titanium alloy was a potential candidate for the stem material in artificial joints.     

新型耐磨锌合金的轴承台架试验研究

通过在ZA27合金中添加Mn或Si等合金元素,制备出两种新型耐磨锌合金。相分析结果表明,它们的组织中含有较多弥散分布的硬质相,如含锰的金属间化合物或初生硅晶粒,这些硬质相的硬度远远高于ZA27合金中硬质点相ε。通过抗压性能测试和轴承台架试验,发现与两种传统的轴承合金ZA27和磷锡青铜ZCuSn10P1相比,新型耐磨锌合金的抗压性能良好、摩擦系数较低、滑动过程平稳、表面温升较低、耐磨性较好。新型锌合金优异的摩擦磨损性能与其耐磨微观组织有密切的关系。     

Ni-Fe-W合金镀层的结构形貌及摩擦学性能研究

利用脉冲电沉积的方法制备了Ni-Fe-W合金镀层,讨论了镀液中W的含量对Ni-Fe-W合金镀层组织结构的影响,以及镀液成分对镀层硬度及厚度的影响。分析了Ni-Fe-W合金镀层在干摩擦条件下摩擦因数随载荷以及速度的变化情况,并与Ni-W合金镀层以及硬铬镀层进行了比较,探讨了干摩擦条件下Ni-Fe-W合金镀层的摩擦磨损机制。在高速轻载时,Ni-Fe-W合金镀层在摩擦过程中会生成有弥散强化作用的中间硬质相和起固体润滑作用的氧化物,使其磨损表现为轻微的磨粒磨损。     

Investigation on Wear Resistance and Fatigue Damage of Laser Cladding Coating on Wheel and Rail Materials under the Oil Lubrication Condition

The aim of this study is to investigate the wear resistance and fatigue spalling damage of wheel and rail materials with and without laser cladding coating under oil lubrication using a rolling–sliding machine. It illustrates that the laser cladding Co-based alloy coating improves the wear resistance of wheel and rail rollers. Serious spalling is dominant for untreated wheel and rail rollers. The wheel or rail roller undergoing laser cladding treatment takes on slight abrasive wear and visible ploughing. Furthermore, there are no cracks on the contact surface and subsurface. The laser cladding Co-based alloy coating exhibits outstanding resistance to wear and fatigue spalling damage due to its microstructure in the coating under oil lubrication.     

Fretting wear behaviour of hypereutectic P/M Al–Si in oil environment

The fretting wear behaviour of forged hypereutectic P/M Al–Si in contact with hardened steel and Cu–Sn–Pb bearing material is investigated. Fretting tests are performed with a view to the movement in the contact between the small end of the connecting rod and the piston pin in a car engine. Therefore, the tests are carried out under engine oil lubrication at temperatures up to 150°C. The behaviour of the Al alloy is compared to that of steel, the current connecting rod material. Some tests under non-lubricated conditions are also performed. The correlation between the friction coefficient, the wear volume and the microscopic wear mechanisms is discussed. After the running-in wear, a stable wear condition is reached for the Al–Si/steel contact.