等离子喷涂Ni/MoS2涂层干滑动摩擦磨损

对等离子喷涂的四种不同MoS2含量的Ni/MOS2涂层的干滑动摩擦磨损性能和机制进行了试验和探讨。结果表明，MoS2的质量分数为30％时磨损率最小；磨损机制主要为磨粒磨损；较大载荷下、MoS2较多时导致其磨损率急剧增大的原因，与润滑膜破坏引起的疲劳磨损和粘着磨损有关。     

高频淬火对FeNiMoCuCr粉末烧结钢干摩擦磨损性能的影响

采用销盘式磨损试验机研究了FeNiMoCuCr系粉末烧结钢经表面高频淬火后,在干摩擦磨损条件下的磨损性能,并借助于扫描电镜观察和分析了磨损形貌,探讨其摩擦磨损机制。结果表明,试验材料的磨损率在磨损开始阶段,随摩擦滑移距离的增加而增加,而后逐渐趋于稳定;高频淬火处理后的FeNiMoCuCr粉末烧结钢的耐磨性高于烧结未淬火的磨损率,扫描电镜显示干摩擦磨损形貌为微观犁沟和塑性变形,粘着磨损和氧化磨损是主要的磨损机制。     

干摩擦及原油润滑条件下丁腈橡胶-钢摩擦副的磨损机理研究

采用MPV-600型微机控磨粒磨损实验机观察干摩擦及原油润滑条件下不同转速对丁腈橡胶磨损行为的影响,并分析了其作用机理。结果表明:干摩擦条件下丁腈橡胶的摩擦系数随转速的增加先减少再增加,主要磨损机理为粘着磨损;原油润滑条件下丁腈橡胶的摩擦系数是随转速的增加先增加后减少而后又增加,主要磨损机理为湿磨粒磨损;同时原油介质的腐蚀性及溶胀作用对橡胶摩擦磨损规律具有直接影响。试验结果对合理选择工作参数以提高橡胶-金属摩擦副的整体寿命具有实际意义。     

The Dry Sliding Wear Behavior of HVOF-Sprayed WC: Metal Composite Coatings

WC-based cermet coatings containing various metallic binders such as Ni, Co, and Cr are known for their superior tribological properties, particularly abrasion resistance and enhanced surface hardness. Consequently, these systems are considered as replacements for traditional hard chrome coatings in critical aircraft components such as landing gear. The purpose of this investigation was to conduct a comparative study on the dry sliding wear behavior of three WC-based cermet coatings (WC-12Ni, WC-20Cr₂C₃-7Ni, and WC-10Co-4Cr), when deposited on carbon steel substrates. Ball on disk wear tests were performed on the coatings using a CSEM Tribometer (pin-on-disk) with a 6-mm ruby ball at 20 N applied load, 0.2 m/s sliding velocity, and sliding distances up to 2000 m. Analysis of both the coating wear track and worn ruby ball was performed using optical microscopy and an Alphastep-250 profilometer. The results of the study revealed both wear of the ruby ball and coated disks allowed for a comparison of both the ball wear and coating wear for the systems considered. Generally, the use of Co and Cr as a binder significantly improved the sliding wear resistance of the coating compared to Ni and/or Cr₂C₃.     

热喷涂工艺对涂层摩擦磨损性能的影响

采用超音速火焰喷涂和爆炸喷涂法在金属表面制备了WC-Co单层涂层和NiCrAl／WC-Co梯度涂层，对涂层的室温干摩擦磨损性能进行了测定和分析。结果表明，超音速火焰喷涂WC-Co单层涂层具有最好的综合磨损性能。梯度涂层较好的结合力对摩擦磨损性能的影响只有在轻载时表现明显。涂层中原有的孔隙和摩擦过程中形成的孔洞可以在一定程度上减轻磨损，而不同条件下形成的磨屑对涂层的摩擦性能亦有较大影响。     

速度和载荷对TC11合金干滑动磨损行为的影响

采用销-盘式高速磨损试验机对TC11合金在0.5~4 m·s~(-1)下进行干滑动摩擦磨损实验,研究了TC11合金的磨损行为,并探讨了磨损机制。结果表明:在0.5~4 m·s~(-1)之间,4 m·s~(-1)时TC11合金磨损失重最低,其次为0.75 m·s~(-1)时的,而2.68 m·s~(-1)时磨损失重最大。不同速度下磨损量均随载荷的增加而增加,其中以2.68 m·s~(-1)时增加最为剧烈。TC11钛合金的磨损为黏着磨损、磨粒磨损和氧化磨损的综合作用结果。0.75和2.68 m·s~(-1)时以黏着磨损和磨粒磨损为主要磨损机制,4 m·s~(-1)时转变为氧化轻微磨损为主。不同工况下磨损过程中均形成摩擦层,4m·s~(-1)时不同载荷下摩擦层中出现数量较多的氧化物TiO、TiO_2,此时摩擦层硬度较高,具有显著地减磨作用。     

Microstructure,Mechanical Properties,and Unlubricated Sliding Wear Behavior of Air-Cooled MnSiCrB Cast Steels

Two medium carbon low-alloy MnSiCrB cast steels containing different Si contents (0.5 and 1.5 wt.%) were designed, and the effects of Si contents on the microstructure, mechanical properties, and unlubricated sliding wear behavior of the cast steels after air-cooling from 850 °C and subsequent tempering at 220 °C was studied. The results show that the microstructure of the cast steel containing 0.5 wt.% Si consists of granular bainite and lower bainite/martensite multi-phase. In the cast steel containing 1.5 wt.% Si, granular bainite was not observed. The microstructure consists of carbide-free bainite/martensite multi-phase. Excellent hardenability can be obtained at both low and high Si levels. The cast steel containing 0.5 wt.% Si exhibits excellent combination of strength, ductility, and impact toughness superior to the cast steel containing 1.5 wt.% Si. Also, the wear-resistance of the former steel is better than that of the latter in the unlubricated sliding wear condition. The air-cooled MnSiCrB cast steel containing low Si levels, with excellent mechanical properties and wear-resistance, is a potential high-performance and low-cost wear-resistant cast steel for unlubricated sliding wear condition.     

Microstructure and Dry Sliding Wear Behavior of Mg-Y-Zn Alloy Modified by Laser Surface Melting

Mg-11Y-2.5Zn alloy was surface-melted using a 6.0 kW continuous wave CO₂ laser as a heat-generating source. X-ray diffractometer, laser optical microscopy, and Vickers hardness indentation were used to characterize the microstructure and hardness of the Mg-11Y-2.5Zn alloy. The results show that the microstructure in the laser-melted zone can be greatly refined and hardness is slightly improved. Dry sliding tests were performed on the as cast and laser surface-melted Mg-11Y-2.5Zn alloys using a pin-on-disk configuration. Coefficients of friction and wear rates were measured within a load range of 20-320 N at a sliding velocity of 0.785 m/s. Laser surface-melted Mg-11Y-2.5Zn alloy exhibited good wear resistance when compared with the as cast one under given applied load conditions, which has been explained by refining of the microstructure in the melted zone. Morphologies of worn surface on the as cast and laser surface-melted Mg-11Y-2.5Zn alloys were examined using scanning electron microscopy. Four wear mechanisms, namely abrasion, delamination, thermal softening, and melting, have operated.     

TC11合金/GCr15钢摩擦副的干滑动磨损行为

在高温磨损试验机上进行TC11合金与GCr15钢在25和600℃的干滑动磨损实验。研究摩擦副(钛合金与对摩钢)的磨损行为,并探讨磨损机制。结果表明:在25℃时,TC11合金具有极高的磨损率并随着载荷快速增加,而GCr15钢的磨损率则随载荷提高略有增加,且处于较低值。在高温600℃时,TC11合金和GCr15钢均表现为随着载荷增加,磨损率变化较小的趋势,且处于极低的值。研究发现高温下摩擦氧化物的形成导致了TC11合金和GCr15钢极低的磨损率。可以认为,在高温下TC11合金与GCr15钢是一种理想的摩擦副。     

Ti-6Al-4V合金在真空中的干滑动磨损行为

在真空(10^-^5Pa)条件下对Ti-6Al-4V合金进行了系统的磨损性能测试，研究了载荷和滑动速度对Ti-6Al-4V合金磨损率的影响．对Ti-6Al-4V合金的磨损表面进行了显微组织分析．实验结果表明，Ti-6Al-4V合金的磨损率随载荷和滑动速度的升高而增加．磨损表面具有层状结构的舌状形貌特征，分析表明这是Ti-6Al-4V合金表面通过接触点处材料的被推挤和碾压过程形成了特殊的变形堆砌层的结果．显微组织分析显示，这种变形堆砌层具有50—100nm尺寸的细小显微组织结构和50mm以上的厚度．     

铸铁的干滑动摩擦磨损

系统地研究了铸铁材料进行了干滑摩擦条件下的摩擦学特性。讨论了钢铁摩擦副的摩擦学规律;铸铁的石墨形态、合金元素及其体组织对于滑动摩擦学特性的影响。研究结果表明：墨铸铁是制作制动部件的合适选材。     

Sintered Cu Alloyed Stainless Steels and Their Corrosion Behavior

Copper is an effective element to activate the sintering process of stainless steels and to enhance corrosion resistance of the sintered specimens. Ways of introducing Cu into stainless steel powders lead to different consequence in the microstructure and corrosion behavior of sintered Cu alloyed stainless steel. In the present work, two methods, mixing Cu with stainless steel powder and coating stainless steel powder with Cu by electroless plating, were introduced in order to investigate their influence on the sintered specimens. It was found that the sintered specimens from Cu-coated stainless steel powders (1-5 wt.%Cu) produce less porous surfaces with isolated pores than the specimens from mixed powders and the former have obviously high density and relatively even Cu distribution. Potentiodynamic polarization measurements indicate that Cu-electroless plating of 1-5 wt.%Cu improves the corrosion resistance of sintered stainless steel due to the lowering of passivation current density.     

铸造Cu包覆石墨/Al复合材料干滑动磨损性能研究

以ZL108铝合金为基体,添加Cu包覆石墨及稀土(Ce),采用机械搅拌制备了Cu包覆石墨/Al复合材料。考察了不同Cu包覆石墨含量的Cu包覆石墨/Al复合材料的组织、硬度及磨损性能。结果表明,试验条件下,在2%~6%的Cu包覆石墨的范围内,石墨分布趋于均匀。制备的Al-4Cu包覆石墨/Al复合材料具有较高的硬度及较好的耐磨性。添加石墨使复合材料的磨损机制由磨粒磨损转变为剥层磨损。     

Ni含量对Cr13Ni5Si2／γ合金高温耐磨性能的影响

研究了Ni含量对镍基固溶体（γ）增韧Cr13Ni5Si2三元金属硅化物合金组织及高温耐磨性的影响。结果表明，Cr13Ni5Si2／γ合金硬度及Cr13Ni5Si2初生树枝晶体积分数均随Ni含量的增加而降低。由于Cr13Ni5Si2的高硬度与Ni基固溶体γ高强韧性配合，Cr13Ni5Si2／γ合金在600℃高温滑动磨损条件下，表现出优异的耐磨性能并随合金中Ni含量增加而迅速增加。合金高温滑动磨损过程主要受Cr13Ni5Si2初生树枝晶的破碎与脱落过程控制。     

滑动干摩擦条件下 HVOF高铝青铜涂层的摩擦磨损性能

针对高铝青铜粉体材料的涂覆应用,采用HVOF技术制备铝青铜(Cu-14Al-X)粉体材料涂层,并与304不锈钢进行滑动干摩擦试验,结合扫描电子显微镜、能谱和电子探针等手段研究涂层的摩擦磨损性能.结果表明,在滑动干摩擦条件下,HVOF高铝青铜涂层的主要磨损形式是粘着磨损及轻微的磨粒磨损.摩擦热使涂层达到了理想粘着摩擦表面的要求,因此涂层具有十分优良的减摩性能,尤其是在高载荷条件下.HVOF高铝青铜涂层的硬度(HV)为500,该硬度保证了涂层具有较低的磨损率,属于轻微磨损.     

Effect of Microstructural Variation on Dry Sliding Wear Behavior of Ti-6Al-4V Alloy

The present article evaluates the influence of independent control factors such as microstructural variation, normal load, sliding velocity, and test duration on dry sliding wear behavior of Ti-6Al-4V alloy at room temperature using a statistical approach. Ti-6Al-4V alloy has been heat treated in a controlled manner in order to produce different microstructural features (i.e., lamellar, bimodal, and equiaxed). Lamellar microstructure is found to be harder than bimodal microstructure followed by equiaxed microstructure in Ti-6Al-4V alloy. Dry sliding wear tests have been carried out using a multiple Tribo tester following a well planned experimental schedule based on Taguchi’s L₉ orthogonal array design. Dry sliding wear behavior of Ti-6Al-4V alloy consisting of various microstructural features is related to their hardness values. Results indicated that lamellar microstructure has the lowest sliding wear resistance followed by bimodal and equiaxed microstructure. With the help of signal-to-noise ratios, optimal combination of control factors to minimize the dry sliding wear in Ti-6Al-4V alloy has been determined. Normal load is the most significant control factor influencing the dry sliding wear behavior of investigated Ti-6Al-4V alloy followed by sliding velocity, test duration, and microstructural variation. Normal load has greater static influence of 27.02%, sliding velocity has an influence of 18.07%, test duration has an influence of 12.71%, and microstructural variation has an influence of 10.55% on weight loss of Ti-6Al-4V alloy due to wear having R ² = 0.89. Two wear mechanisms have been identified: oxidative wear occurs at the lowest sliding velocity and delamination wear occurs at the highest sliding velocity. Optical microscopy, scanning electron microscopy, energy dispersive x-ray spectroscopy, and Rockwell hardness measurements have been used to characterize the microstructures in order to correlate the results obtained.     

铁对高铝青铜合金摩擦磨损性能的影响

采用立式万能摩擦磨损试验机测定了不同Fe含量的高铝青铜在干摩擦条件下的摩擦磨损行为.结果表明:适量的Fe含量可细化铝青铜合金的组织,有效提高合金耐磨性.在低速低载的摩擦条件下,随Fe含量的增加,合金磨损量变化不大,摩擦系数较低.在中速中载摩擦条件下,磨损量先减少后增加,摩擦系数均小于低速低载条件下的摩擦系数.Fe含量为4％时,高铝青铜合金具有较好的耐磨性.     

颗粒增强铝基复合材料干摩擦磨损研究进展

综述了近年来国内外有关颗粒增强铝基复合材料干滑动摩擦磨损的研究现状,分析了各种因素对其磨损率.摩擦系数等摩擦磨损性能的影响.最后分析了颗粒增强复合材料在研究中存在的问题并对其应用前景进行了展望.     

Dry Sliding Wear Behavior of Fly Ash Cenosphere/AZ91D Mg Alloy Composites

Fly ash cenosphere/AZ91D Mg alloy (FAC/AZ91D) composites were prepared using stir casting method. The effects of the applied load, the wearing time, and the diameter and the content of fly ash cenosphere on the wear behavior of the composites were investigated under dry sliding condition. The results showed the wear resistance of FAC/AZ91D composites is generally better than that of AZ91D Mg alloy. The mass fraction and diameter of FAC have important effects on the wear resistance of the composites, and the wear resistance of the composites is excellent when the mass fraction and diameter of FAC are moderate. When the mass fraction and diameter of FAC are more than the critical values, the wear resistance of the composites lowers again. The wear resistance of the composites decreases with the increase in the applied load. The relationship between the worn mass loss and the applied load is nonlinear. When the applied load is smaller, the worn mass loss of the composites increases rapidly with the increase of the applied load. These research results show that the composites have broad application prospects under dry sliding wear condition, and they can provide guidance for the selection of the raw materials, the structure design, and the application conditions of the composites.     

放电等离子烧结铁基非晶涂层的滑动与冲蚀磨损性能

目的研究放电等离子烧结的Fe_(48)Cr_(15)Mo_(14)Y_2C_(15)B_6非晶涂层在滑动和冲刷条件下的耐磨性。方法利用放电等离子烧结(SPS)技术,制备Fe基非晶态合金涂层。通过滑动磨损实验和冲蚀磨损试验,分别评价非晶涂层的滑动磨损性能和冲蚀磨损性能,并通过X射线衍射仪和扫描电子显微镜分析非晶涂层的组织结构以及磨损形貌。结果非晶涂层在滑动摩擦条件下,随着载荷由10 N增加至20 N,磨损率由0.089×10~(-3)mm~3/m上升到0.216×10~(-3)mm~3/m,但摩擦系数由0.841减小到0.778。非晶涂层在冲蚀磨损条件下的体积磨损率随着冲蚀角度(30°~90°)的增加,先增大后减小,45°时达到极大值(15.80 mm~3/h)。磨损表面形貌表明,铁基非晶的滑动磨损机制主要是疲劳磨损和粘着磨损,冲蚀磨损机制主要表现为构成涂层的粉末颗粒的脆性剥落。结论与常用AISI 52100轴承钢相比,SPS制备的非晶涂层在滑动摩擦条件下有着显著的低磨损率和低摩擦系数,但在冲蚀磨损条件下的耐磨性能较差。