巴氏合金ZSnSb8Cu4的摩擦磨损行为

以巴氏合金ZSnSb8Cu4与45#钢为摩擦副,研究巴氏合金ZSnSb8Cu4在不同实验参数下的摩擦磨损行为。采用X射线衍射仪(XRD)、扫描电镜(SEM)和X射线能谱仪(EDS)对实验样品进行表征,分析其摩擦磨损机制。结果表明:巴氏合金试样在正常温度(130℃)下具有较低且稳定的摩擦因数和磨损率;当试样温度超过130℃时,巴氏合金表面的相成分发生明显变化,磨损率也急剧增大,磨损由以磨粒磨损为主的轻微磨损转变为以熔融磨损为主的严重磨损。     

不同润状态下炭纤维对锡青铜摩擦磨损性能的影响

短碳纤维增强锡青铜（碳／锡青铜）复合材料分别在干摩擦和有油滑状态下与钢进行了滑动对磨试验，研究了试验条件及碳纤维含量等因素对复合材料摩擦磨损性能的影响。试验结果表明，碳纤维对锡青铜摩擦磨损性能的影响行为与润滑状态有关，干摩擦时碳纤维的加入可以明显提高锡青铜的摩擦磨损性能，而有油润滑时碳纤维对锡青铜的摩擦磨损性能不仅没有改善，还会带来损害。     

铅黄铅与锡青铜钎焊工艺的改进

主要介绍了铅黄铜与锡青铜两种材料制造的压力传感器件的自动钎焊工艺。对自动钎焊的工艺参数提出了较为系统的数据，对提高焊接接头质量，降低钎焊消耗，提高生产效率等问题进行了探讨，取得了对生产有指导意义的结论。     

高强度耐磨铝青铜材料的滚压性能研究

在自行研制的气动滚压装置上,应用响应曲面法中的Box-Bahnken试验设计对高强度耐磨铝青铜材料的滚压性能进行了研究,分别建立了表面粗糙度、显微硬度与滚压参数(滚压力、滚压速度和滚压次数)的数学模型,分析了各参数对表面粗糙度和显微硬度的影响。试验结果表明该滚压装置能使铝青铜工件的表面质量由加工前的Ra2·02μm、HV201达到Ra≤0·12μm、HV330以上。最后根据试验结果对滚压参数进行了优化。     

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。     

锡青铜超疏水表面纳秒激光制备及润湿性转变机理研究

以锡青铜为基底,研究采用纳秒紫外激光代替飞秒激光制备金属超疏水表面的方法。通过改变激光加工参数制备了不同表面微观结构,并采用扫描电子显微镜和接触角测量仪对所制备的微观结构和润湿性进行了表征,通过X射线光电子能谱(XPS)分析了所制备的样片表面化学元素含量及其随时间的演变,对润湿性转变的机理进行了解释。研究结果表明,采用纳秒紫外激光可以在锡青铜基底制备类似飞秒激光加工得到的金属超疏水表面;激光加工后的样片润湿性随时间变化,转变机理是激光加工过程中生成的CuO在磷元素的催化脱氧作用下生成了本征疏水的Cu2O;在紫外激光能量密度为5.61 J/cm2下,激光扫描速度100 mm/s时,所制备的表面具有微纳复合结构的表面接触角超过150°,滚动角小于10°。     

钛合金铣削刀具磨损对表面完整性影响研究

为了掌握钛合金TC4铣削过程中刀具磨损对表面完整性的影响规律,通过对不同刀具后刀面磨损量下铣削钛合金工件的表面完整性测试,得出了刀具磨损对表面完整性的影响规律,并对其影响机理进行了分析.结果表明,在刀具处于初期磨损和正常磨损阶段,刀具的挤光效应引起的压应力占主导地位,而在刀具剧烈磨损阶段,加工过程中的热塑性变形引起的拉应力占主导地位;随着刀具后刀面磨损量的增加,刀具正常磨损阶段粗糙度值缓慢增加,剧烈磨损阶段粗糙度值迅速增加;随着刀具后刀面磨损量的增加,已加工表面的显微硬度值和表面层的硬化深度都随之增大.     

铅黄铜与锡青铜钎焊工艺的改进

主要介绍了铅黄铜与锡青铜两种材料制造的压力传感器件的自动钎焊工艺。对自动钎焊的工艺参数提出了较为系统的数据，对提高焊接接头质量，降低钎焊消耗，提高生产效率等问题进行了探讨，取得了对生产有指导意义的结论。     

铜/铬青铜摩擦副磨损表面形貌与电弧的相互作用关系

为探究载流摩擦磨损过程中摩擦副磨损表面形貌与电弧的相互作用关系,在HST-100高速载流摩擦磨损试验机上以铜/铬青铜为摩擦副进行载流摩擦磨损试验。用三维形貌仪测量磨损表面粗糙度,并通过扫描电子显微镜分析试验后销试样表面形貌。结果表明:起始表面粗糙度在磨损初期对电弧能量、摩擦因数有影响,在磨损中后期其影响并不显著;表面粗糙度与燃弧率有一定的正相关性,表面粗糙度较大时,燃弧率与电弧能量较大,表面粗糙度降低,燃弧率与电弧能量也随之降低;质量磨损率呈现"U"形变化,摩擦因数则先降低后升高;磨损初期,磨损机制主要是黏着磨损,没有明显的电弧侵蚀作用,磨损中后期,电弧侵蚀越发严重,出现电弧烧蚀坑,并造成熔融堆积。     

钢铜摩擦副摩擦磨损特性的试验研究

本文试验分析了ＺＱＡ１９－４和ＺＱＺｎ６－６－３两种铜合金材料在不同的表面粗糙度下对摩擦系数和出口区油温的影响，以及改变载荷和相对滑动速度时，摩擦系数的变化状况。结果表明；铜合金成分不同时具有不同的硬度。     

Prediction of Steady-State Wear Coefficients in Adhesive Wear

With an integrated adhesive wear model, Yang's second wear coefficient equation was previously found suitable for modeling the standard wear coefficients for both the transient wear and the steady-state wear of MMC-A, MMC-B, and MMC-C, which are aluminium-based matrix composites containing 10%, 15%, and 20% alumina particles, respectively. In this study, Yang's third wear coefficient equation was used to predict the standard wear coefficient and the net steady-state wear coefficient, respectively, for MMC-D, an aluminium alloy matrix composite containing 20% spherical alumina particles, and an aluminium alloy A6061-T6. As compared with the wear data obtained previously, the average deviations were found to be about 23% and 15%, respectively, for the predicted standard wear coefficients and about 20% and 65% for the predicted net steady-state wear coefficients for the two materials respectively. The high deviation of about 65% obtained for the aluminium alloy was due to the very low wear rate obtained during wear testing with a long sliding distance, with the presence of powdery debris.     

An Integrated Transient and Steady-State Adhesive Wear Model

The integrated adhesive wear model tokes into account both the transient wear and the steady-state wear in wear testing. The transient wear volume is described by an exponential equation while the steady-state wear by a revised Archard's equation. In this study, the integrated wear model was used to analyze experimental wear data obtained previously for an A6061-T6 alloy and MMC-D, an aluminium alloy matrix composite containing 20% spherical alumina particles. Two loads of 7.5 kgf and 10.0 kgf, and a speed of 4.58ms^?1 were used in conducting the experiments. Both the standard wear coefficient and the net steady-state wear coefficient values for both types of materials were determined. On the average, the average standard steady-state wear coefficient, as compared with the net steady-state wear coefficient, was about 52% higher for MMC-D and 246% higher for A6061-T6. A higher load was found to have the effect of increasing the wear coefficient values.     

Topographic Investigation of the Wear Resistance of PTFE Seals in Sliding Contact with Ceramic Materials

This paper is concerned with the wear of PTFE seals used in connection with reciprocating ceramic-coated rods. An analysis of the relationship between the surface topography of ceramics and wear of PTFE seals was undertaken, formulating three hypotheses which have been investigated experimentally using a seal test rig and a system for three-dimensional surface roughness analysis. It was observed that no running-in of the rod surface lakes place and, consequently, the tribological situation never stabilizes. It was shown that seal wear rate is dependent on the number of asperities penetrating the lubricant film thickness, the wear rate being correlated to a functional parameter (S_{pk_0}) which was especially developed to describe the peak height above the mean plane. Furthermore, it was illustrated how the structure of ceramics allows the lubricant to flow unhindered between isolated asperities in contrast to the traditionally polished structure of steel which restricts the lubricant flow.     

有效改善凸轮硬度和耐磨性的措施

介绍了几种能有效改善凸轮型面硬度和耐磨性的方法。凸轮磨损种类繁多,因根据具体情况选用适合的凸轮基材,并进行合理有效的热处理。合金涂层在不改变凸轮基材的情况下,能够有效提高凸轮的硬度和耐磨性。     

Tribological Characteristics of Sustainable Fiber-Reinforced Thermoplastic Composites under Wet Adhesive Wear

The friction and specific wear rate of sustainable kenaf fiber–reinforced polyurethane composites were investigated against stainless steel counterface and under wet contact conditions. The new composites were evaluated at different applied loads (50–80 N), sliding distances (up to 2.7 km), and fiber mat orientations. Scanning electron microscopy (SEM) was used to observe the damage features on the worn surfaces. The results revealed that sustainable kenaf fibers assisted in enhancing the wear and frictional performance of the polyurethane thermoplastic composite by about 59 and 90%, respectively. Operating parameters and mat orientation controlled the wear and the frictional behavior of the composite. Better wear performance was exhibited at high loads and when the fiber mats were oriented perpendicularly to the sliding direction. Observations of the worn surfaces revealed different features of damage such as microcracks, fiber tearing, fiber detachment, and delamination. However, there was no trace of fiber pull-out in any of the tested conditions.     

Experimental Study on the Effect of Microstructure on Dry Sliding Wear Behavior of Titanium Alloy Using Taguchi Experimental Design

The present article depicts the influence of independent control factors such as microstructural variation, normal load, sliding velocity, and test duration on the dry sliding wear behavior of titanium alloy at room temperature using a statistical approach. Different heat treatments were carried out in a controlled manner to produce various microstructural features (i.e., lamellar, bimodal, and equiaxed) in this alloy. A lamellar microstructure is found to be harder than bimodal microstructure followed by an equiaxed microstructure in this alloy. Dry sliding wear tests were carried out using a multiple tribotester following a well-planned experimental schedule based on Taguchi's orthogonal arrays. The dry sliding wear behavior of this alloy consisting of various microstructural features is related to their hardness values. The results indicated that a lamellar microstructure has the lowest sliding wear resistance followed by bimodal and equiaxed microstructures. Using signal-to-noise ratios and analysis of variance (ANOVA), an optimal combination of control factors that minimize the dry sliding wear in this alloy were determined. Among all four control factors, normal load is the most significant control factor influencing the dry sliding wear behavior of the investigated titanium alloy, followed by microstructural variation, sliding velocity, and test duration. Normal load has a greater static influence of 39.53%, microstructural variation has an influence of 31.55%, sliding velocity has an influence of 21.6%, and test duration has an influence of 5.7% on the dry sliding wear of this alloy. Two wear mechanisms were identified: oxidative wear occurs at the lowest sliding velocity and delamination wear occurs at the highest sliding velocity. Optical microscopy, scanning electron microscopy, and Rockwell hardness measurements were used to characterize the microstructures in order to correlate the results obtained.     

Ni-P-Cr2O3化学复合镀层耐磨性的研究

研究了热处理对Ni-P-Cr2O3化学复合镀层组织结构、硬度及耐磨性的影响，并与Ni-P镀层作了对比。结果表明，镀层的摩损规律与硬度变化规律不同，采用正确的热处理工艺，可使镀层的硬度及耐磨性显著改善。     

绿色加工中刀具磨损对表面粗糙度影响的研究

在切削镍基高温合金材料过程中,由于不稳定因素造成已加工表面粗糙度很难控制,尤其是刀具磨损直接影响着表面粗糙度。通过对冷风油雾、冷风和常温油雾等不同冷却切削条件下刀具磨损和工件表面粗糙度微观形貌的实验,研究了高速切削镍基高温合金材料时,在不同冷却切削条件下刀具磨损对工件表面粗糙度的影响,揭示了用冷风高速切削提高表面加工质量的规律。     

A New Roughness Parameter Including Hardness and Contact Frequency Effects on Lubricated Rolling/Sliding Wear

Surface roughness, roughness arrangement, film thickness, material hardness, and run-in process have significant effects on the lubricated rolling/sliding wear of mechanical components such as gears and bearings. In conventional analysis, a film thickness parameter is calculated by a geometric approach to study the wear resistance of a contact system without considering the effects of material hardness and run-in process. Although the conventional parameter is simple, it does not correlate with some experimental observations. In this work, a new roughness parameter is developed for the prediction of lubricated rolling/sliding wear. Surface roughness will be adjusted by its hardness and contact frequency. The calculation results are consistent with four groups of experimental data. It is proved that the conventional models can be derived as a special case of the new model when two contact surfaces have the same properties. The new model can be used in the optimal design and manufacturing of mechanical interfaces to reduce lubricated rolling/sliding wear.