滑动速度对磨损自补偿性能的影响

研究了５组滑动速度下钢－铜摩擦副在不同润滑介质作用下的摩擦学特性，发现摩擦副加有自补偿添加剂ＳＷ４和常规润滑剂具有不同的摩擦学特性：总的说，前者的钢、铜及副的磨损均比后者低得多；其相对耐磨性也随速度的增加而下降；而在某些速度下自补偿剂作用使钢出现负磨损；速度越低，磨损自补偿效应越显著。自补偿添加剂ＳＷ４能提高低速运行下钢－铜摩擦副（如丝杆螺母副、蜗轮蜗杆副）的磨损寿命。     

Ce-TZP-(Al2O3)陶瓷与Cr12钢的摩擦磨损行为

本文研究了Ｃｅ－ＴＺＰ－（Ａｌ２Ｏ３）陶瓷在不同载荷（１００￣５００Ｎ），不同介质环境（空气、水、醋酸、氨水）下与Ｃｒ１２钢的磨擦磨损特性。根据磨损前后摩擦副表面形貌特征下相成份变化，分析了氧化锆陶瓷的磨损机理。１０００Ｎ时，干摩擦摩擦系数与磨损率较高，此时磨损机理以磨粒磨损为主，在液体介质中摩擦系数与磨损率都较低，磨损机理以分层剥落为主；２００Ｎ以上时，陶瓷摩擦面上发生马氏体相变，磨损机理以脆性     

润滑剂对Ti（CN）陶瓷摩擦学性能的影响

在销－盘试验机上考察了干摩擦、水润滑及油润滑条件下Ｔｉ（ＣＮ）／４５＾＃钢摩擦副的磨擦磨损性能。Ｔ ｉ（ＣＮ）陶瓷的磨损主要由粘着剥东和微断裂引起。水对该摩擦副的摩擦性能无明显改善，但能明显地上陶瓷的磨损。     

在点线接触条件下钢/钢摩擦副的干摩擦高温减摩抗磨性能的研究

用多功能SRV实验机评价了钢/钢摩擦副在干摩擦条件下的的高温减摩抗磨性能,并对高温磨损机理进行了探讨.结果表明,钢/钢摩擦副的高温摩擦系数随着实验负荷的增加呈下降趋势,而随着实验时间的延长呈增长趋势.钢/钢摩擦副的线接触高温摩擦系数明显比点接触时的高温摩擦系数大,SPHC/GCr15摩擦副的高温摩擦系数明显高于GCr15/GCr15摩擦副的高温摩擦系数.钢球在点接触条件下的磨损随实验负荷的增加呈线性增长趋势,而钢柱在线接触条件下的磨损随实验负荷的增加呈线性降低趋势.在相同负荷下,SPHC/GCr15摩擦副的磨损要较GCr15/GCr15摩擦副的磨损略微大.钢/钢摩擦副在高速度下的磨损机理主要是磨粒磨损,而在较低速度下主要是磨粒磨损和粘着磨损.     

Ti（CN）－Al_2O_3复合陶瓷与金属摩擦副的摩擦学特性研究

本文对水及油润滑条件下Ｔｉ（ＣＮ）－Ａｌ２Ｏ３复合陶瓷与纯铝、纯铁及不锈钢三种金属的摩擦、磨损特性进行了研究．在两种条件下，随着载荷及速度的增加，三种摩擦副的磨损量均明显增大．但两种润滑条件下的变化趋势稍有差别，水润滑时摩擦副的磨损量比油润滑时的大．与干摩擦时的试验结果相比，水或油的存在不仅没起到减磨作用，反而使磨损加剧．能谱分析结果表明，两种润滑情况下，金属与陶瓷间均有材料的转移或扩散发生，但水润滑时摩擦副材料间相互转移的量比油润滑时更大．     

关于行星磨粉碎的氧化铝粉污染及烧结性能研究

关于行星磨粉碎的氧化铝粉污染及烧结性能研究摘自《粉体工学会志》（１９９３）３０（８）：该文论述了行星磨粉碎的氧化铝粉污染及其对烧结性能的影响ｕＳｔ。Ｎ．材质的磨矿容器及研磨介质球，由于磨损使粉体有Ｓｔ和Ｎ污染、部分磨损的出。Ｎ。和煤液ＣＨ。ＯＨ中的Ｈ...     

三种机械密封材料的摩擦磨损性能研究

研究了3种核主泵用机械密封陶瓷材料(氮化硅、氧化铝和碳化硅)在室温干摩擦条件下及水润滑条件下分别与氮化硅陶瓷球对磨的摩擦磨损性能。研究结果表明,在与氮化硅球干摩擦的3种材料中氧化铝陶瓷具有最大的摩擦系数和最小的磨损质量,氮化硅具有最小的摩擦系数。在氮化硅陶瓷自配对摩擦副摩擦磨损试验中,水润滑条件下氮化硅摩擦系数及摩擦质量损失都有很大程度的减小,且摩擦系数随转速增加而减小。综合考虑力学性能和摩擦磨损性能,选择氮化硅陶瓷作为核主泵机械密封材料更合适。     

氧化铝纤维含量对陶瓷基摩擦材料性能的影响

以工业废渣粉煤灰作为主要陶瓷组分,氧化铝纤维为增强相,采用冷压成型-热压固化两步法制备了氧化铝纤维增强陶瓷基摩擦材料,通过定速式摩擦磨损试验机研究了氧化铝纤维含量对陶瓷基摩擦材料性能的影响规律,并借助SEM观察磨损后样品的表面形貌,揭示了其摩擦磨损机理。结果表明:随着氧化铝纤维含量的增加,陶瓷基摩擦材料的孔隙率与密度不断增加,而硬度则先降低后上升然后再略降低;摩擦系数随氧化铝纤维含量的增加呈现出先降低后上升的趋势,当氧化铝纤维含量为25%时,样品的摩擦系数稳定在0.60左右;添加氧化铝纤维促进了陶瓷基摩擦材料的磨损,且随其含量增加,磨损率总体上呈增大趋势;未添加氧化铝纤维的陶瓷基摩擦材料磨损形式主要为磨粒磨损和接触疲劳磨损,而添加25%氧化铝纤维的陶瓷基摩擦材料磨损形式以磨粒磨损、粘着磨损和纤维的脆性断裂为主。     

Ti（CN）—Al2O3复合陶瓷与金属摩擦副的摩擦学特性研究

本文对水及油润滑条件下Ｔｉ（ＣＮ）－Ａｌ２Ｏ３复合陶瓷与纯名、纯铁及不锈钢三种金属的摩擦、摩损特性进行了研究。在两种条件下，随着载荷及速度的增加，三种摩擦副的磨损量明显增大，但两处润滑条件下的变化趋势稍有差别，水润滑时摩擦副的磨损量比油润滑时地大，与干摩擦时的试验结果相比，水同的存在不仅没真情以减摩作用，反面使磨损加剧，能谱分析结果两种润滑情况下，水或油的存在不仅没起到减磨作用，反面使磨损加剧，能     

UHMWPE-SiC生物摩擦学的特性及机理

为了探索超高分子量聚乙烯（UHMWPE）与碳化硅（SiC）陶瓷组合作为人工关节置换材料的可能性,利用Falex摩擦磨损实验机测定了37℃下UHMWPE与SiC陶瓷摩擦副在血浆润滑条件下的生物摩擦学性能．结果表明,UHMWPE－SiC摩擦副的摩擦系数为0.05;UHMWPE的磨损系数＜8．45×10^-10mm³／N.m．表面轮廓仪对磨损前后SiC陶瓷表面进行测试,未发现明显变化,说明SiC陶瓷磨损甚微．根据XPS分析结果;提出了生物摩擦磨损机理．     

断裂方式对氧化铝基复合陶瓷耐磨性的影响

通过磨粒磨损试验测定了氧化铝 陶瓷、氧化铝/碳化硅复合陶瓷和氧化铝/莫来石复合陶瓷的耐磨性. 利用透射电子显微镜(TEM)观察了样品的微观结构, 采用扫描电子显微镜(SEM)分析了样品的断口形貌和磨损表面的剥落情况. 研究了断裂方式对磨损表面剥落和耐磨性的影响. 结果表明: 氧化铝陶瓷的磨损主要由断裂磨损机制控制, 氧化铝/碳化硅复合陶瓷的磨损主要由塑性磨损机制控制, 氧化铝/莫来石复合陶瓷受这两种磨损机制共同作用. 相对于氧化铝陶瓷, 氧化铝/碳化硅复合陶瓷和氧化铝/莫来石复合陶瓷的耐磨性提高2～4倍, 这主 要是由于其断裂方式转变为以穿晶断裂为主, 减少了磨损面的脆性剥落.     

Cr3C2与（W,Ti）C增强氧化铝陶瓷的摩擦磨损性能

采用热压烧结技术制备了Al2O3/Cr3C2/(W,Ti)C复合陶瓷材料,对其物理力学性能、摩擦磨损性能进行测试,用扫描电镜(SEM)对其磨损表面进行观察。结果表明:Al2O3/Cr3C2/(W,Ti)C陶瓷材料具有良好的综合力学性能,在与硬质合金YG8圆环的对磨中表现出较高的减摩抗磨性能,摩擦因子与磨损率较单相Al2O3降低近50%。对其磨损机理研究认为,磨粒磨损为主要磨损机制,高的强度和韧性是其具有良好耐磨性能的主要原因。     

氧化铝陶瓷的高温磨损与自润滑机理研究

研究了Al₂0₃陶瓷从室温至12000℃在于摩擦条件下的高温摩擦磨损行为。结果表明：在600℃以后的摩擦磨损随温度上升而逐渐减小,在1200℃的摩擦系数仅为室温的60％磨损则降低了两个数量级,表现出良好的高温自润滑特征。在不同温度下,存在三种显著不同的磨损机理．从室温至600℃,主要是磨粒磨损和微断裂,磨损随温度上升而略有增加．在600～1000℃,磨损机理逐渐由脆性断裂过渡到塑性变形和再结晶,在表面形成一个厚度为5～10μm的、类似于纳米材料结构的特殊表面层．随着这种特殊表面层的形成,磨损显著下降．在1200℃,摩擦表面由塑性变形发展到软化状态,出现流体动力润滑,使摩擦磨损进一步降低．     

Synthesis and tribological behavior of metakaolinite-based geopolymer composites

Metakaolinite-based geopolymer composites containing 5%–30% (volume fraction) scalelike graphite, polytetrafluoroethylene (PTFE), and molybdenum disulfide (MoS₂), respectively, were synthesized in the presence of a compound activator composed of aqueous NaOH and sodium silicate at room temperature. The tribological behaviors of the resulting composites sliding against AISI-1045 steel were investigated on an MM-200 friction and wear tester, and the bending strength and compressive strength of the composites were determined on a universal materials tester. Moreover, the worn surfaces of the composites were analyzed by means of scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS), which was aimed to reveal the wear mechanisms of the composites. It was found that all the three kinds of the tested solid lubricants contributed to greatly decrease the friction and wear of the composites, and they were also able to remarkably reduce the fluctuation of the friction coefficient. This was attributed to the formation of a lubricating film containing higher content of the detached solid lubricant particulates and the oxidized product Fe₂O₃ of the counterpart steel wear debris. The metakaolinite-based geopolymer was dominated by severe adhesion wear, while its composites filled with the solid lubricant particulates were characteristic of mild adhesion, scuffing, and delamination.     

Synthesis of mesoporous anatase TiO2 nanotubes by a hydrothermal treatment and their use in solid-state dye-sensitized solar cells

Mesoporous anatase TiO2 nanotubes (NTs) with the diameter of about 7 12 nm and the length of several hundred nanometers were synthesized by a hydrothermal method on commercial TiO2 particles in NaOH followed by HCI washing. The samples were characterized by X-ray diffraction (XRD), transmitting electron microscopy (TEM), and Brunauer-Emmet-Teller (BET) measurements. The hydrothermal treatment temperature at 130 degrees C was shown to affect not only the extent of particle-to-sheet conversion, and thus the resulting structures of the NTs, but also the anatase-to-rutile transformation. The surface area of the NTs was 200 m2g(-1). This value was much higher in comparison to TiO2 nanoparticles of 50 m2g(-1). It was also found that the NT photoelectrodes had a pronounced impact on the performance of solar cells as compared to nanoparticle ones. This was probably due to lead to a significantly higher specific dye loading and, for certain hydrothermal treatments, resulting in a doubling of the solar cell efficiency (in our case from 2.84% to 4.03% of AM 1.5 conditions).     

Abrasive wear behavior of various reinforced AA6061 matrix composites produced with hot pressing process: A comparative study

The effects of various reinforcements (boron carbide ‐silicon carbide‐alumina) with constant volume fraction (20 %) on the abrasive wear properties of AA6061 matrix composites produced with hot pressing process were investigated. The wear tests were carried out using a pin‐on‐disk wear tester by sliding at sliding speeds of 1.2 m/s against silicon carbide paper. Applied normal loads have 5, 10 and 15 N magnitude at room temperature. The wear morphologies of the worn surfaces were analyzed using a scanning electron microscope in order to examine the wear characteristics and to investigate the wear mechanisms. The effects of reinforcement type on the wear behavior of AA6061 matrix composites were observed. Results exhibited that the optimum wear resistance obtained with the boron carbide reinforced composite parts. All reinforced samples showed better wear resistance compared to as‐received samples in all the studied conditions. Scanning electron microscope characterization showed that test specimens have complex combination of wear mechanisms on the worn surface.     

Studies on Machining Parameters While Milling Particle Reinforced Hybrid (Al6061/Al2O3/Gr) MMC

In this article, response surface methodology has been used for finding the optimal machining parameters values for cutting force, surface roughness, and tool wear while milling aluminum hybrid composites. In order to perform the experiment, various machining parameters such as feed, cutting speed, depth of cut, and weight (wt) fraction of alumina (Al₂O₃) were planned based on face-centered, central composite design. Stir casting method is used to fabricate the composites with various wt fractions (5%, 10%, and 15%) of Al₂O₃. The multiple regression analysis is used to develop mathematical models, and the models are tested using analysis of variance (ANOVA). Evaluation on the effects and interactions of the machining parameters on the cutting force, surface roughness, and tool wear was carried out using ANOVA. The developed models were used for multiple-response optimization by desirability function approach to determine the optimum machining parameters. The optimum machining parameters obtained from the experimental results showed that lower cutting force, surface roughness, and tool wear can be obtained by employing the combination of higher cutting speed, low feed, lower depth of cut, and higher wt fraction of alumina when face milling hybrid composites using polycrystalline diamond insert.     

温度对Al2O3/ZrB2/ZrO2复合材料摩擦磨损特性的影响

采用UMT-2多功能摩擦实验机,研究了温度对Al2O3/ZrB2/ZrO2复合刀具材料摩擦磨损性能的影响,并分别使用白光干涉仪和扫描电镜分析实验后磨痕的轮廓和微观形貌。结果表明,常温摩擦时,随着ZrB2/ZrO2含量的增加,AZ系列自润滑陶瓷材料与硬质合金对摩时的摩擦系数逐渐降低。高温摩擦时,随着环境温度的提高,表面摩擦温度不断上升,生成的润滑膜有助于使摩擦系数和磨损率下降。     

氧化铝陶瓷摩擦材料制备的初步研究

采用热压烧结工艺制备了氧化铝陶瓷为基体、添加固态润滑组元石墨或氮化硼的陶瓷基摩擦材料。通过摩擦磨损对比试验,借助SEM分析手段,研究了陶瓷摩擦材料性能以及摩擦磨损方式。