烷基硫代磷酸稀土盐的制备及摩擦学特性研究

以异丙醇或异辛醇、五硫化二磷、稀土氯化物为原料 ,合成了四种油溶性二烷基二硫代磷酸稀土盐 .以红外光谱和化学分析确定了所合成稀土盐的结构和化学组成 .在四球实验机上研究了几种稀土盐抗磨添加剂在不同加入量的情况下的最大无卡咬负荷及在不同负荷下抗磨损能力 ,并与二烷基二硫代磷酸锌的性能进行了比较 .结果表明 :本研究制备的油溶性二异丙基二硫代磷酸镧LaDDP - 3、二异丙基二硫代磷酸钕Nd DDP - 3和二异辛基二硫代磷酸镧LaDDP - 8、二异辛基二硫代磷酸钕NdDDP - 8具有比二烷基二硫代磷酸锌(ZnDDP)好的抗磨性能和减摩性能 .EDXA分析表明在实验条件下 ,稀土元素摩擦扩渗进入了材料的表面 ,这可能是此类稀土盐具有优秀的抗磨性能的主要原因     

PTFE填充PI基复合材料摩擦学性能

以聚四氟乙烯(PTFE)为填料,聚酰亚胺(PI)为基体,通过机械冷压法制备了聚酰亚胺/聚四氟乙烯(PI/PTFE)自润滑复合材料。研究了PTFE在复合材料中质量分数对该材料和金属试件对磨时摩擦学性能的影响。结果表明:在一定质量范围内PTFE的加入对于提高复合材料耐磨性具有积极的促进作用。当PTFE质量分数为30%时,PI/PTFE复合材料磨损率最低。和纯PI相比,填充PTFE的复合材料耐磨性提高3个数量级。对试件磨损形貌的分析表明:在对偶面形成转移膜的连续性直接影响PI/PTFE复合材料的摩擦磨损行为。对应最佳摩擦学性能时形成的自润滑转移膜更加连续、光滑和完整。     

Structure and tribological property of B2-based approximants

The present paper is concerned with a special group of approximants with B2 superstructures. In the first part, recent work on structural features of the B2 superstructure approximants is summarized. Experimental results obtained in Al-Cu-Mn and Al-Cu systems are presented, where a series of B2-based approximants are observed. These phases all have similar valence electron concentrations, in full support of thee/a-constant definition of approximants. Special emphasis is laid on the chemical twinning modes of the B2 basic structure in relation to the Al-Cu approximants. It is revealed that the B2 twinning mode responsible for the formation of local pentagonal atomic arrangements is of 180°/[111] type. This is also the origin of 5-fold twinning of the B2 phase on quasicrystal surfaces. Crystallographic features of phases B2, τ2, τ3,γ, and other newly discovered phases are also discussed. In all these phases, local pentagonal configurations are revealed. In the second part, dry tribological properties of some AlCuFe samples containing the B2-type phases are presented. The results indicated that the B2 phase having their valence ratio near that of the quasicrystal possesses low friction coefficient under various loads, comparable with the annealed quasicrystalline ingot. Such a result indicates that the B2-type phase withe/a near that of quasicrystal is indeed an approximant, which is in full support of the valence electron criterion for approximants.     

不同加载条件对聚甲醛复合材料的摩擦学性能影响

用摩擦磨损试验对转矩流变仪-模压成型方法制备的Ekonol/POM和Ekonol/G/MoS2/POM复合材料在不同加载条件下的摩擦学性能进行了研究.结果表明:在标准加载条件下,POM及其复合材料的摩擦系数和磨损量都是随着Ekonol含量的增加而呈现先下降后上升的趋势;在特殊加载条件下,随着载荷的增加,POM及其复合材料的摩擦系数呈先增大后减小趋势,而材料的磨损量则随着载荷的增加而增大,经测定得出的ZOGM20的极限PV值比POM提高14.5%.     

创建和发展自然灾害摩擦学

回顾了自然灾害摩擦学孕育的历史背景,阐明其定义、研究对象、社会功能和主要任务。介绍这一新领域研究的主要进展,并提出今后的研究方向。     

Tribology science, technology and education in Armenia

State of the art in the field of tribology in Armenia is discussed. The main problem in research, education and technology transfer to industry are considered.     

REMo-1型稀土特种润滑膏的研制

针对汽车发动机汽门杆与阀座之间的润滑条件要求,在重点解决了基础油脂与二硫化钼、石墨、稀土化合物以及分散剂等固体润滑剂之间的协同效应,石墨对金属底材的电化学腐蚀等技术难题的基础上,研制出了一种含稀土的特种润滑膏。性能测试结果表明,该特种润滑膏具有良好的耐磨性和润滑性,而且还具有良好的耐腐蚀性,其主要性能指标优于国外的同类产品MolyPaste。该特种润滑膏的性能达到了技术协议要求,可以用于汽车发动机汽门杆与阀座之间的润滑,并可用在其它类似的军工和民用上,具有重要的推广应用前景。     

Strategies for revealing deformation and wear mechanisms of polymer composites by combining scanning electron microscopy,energy dispersive x-ray spectroscopy and cross-section techniques—Exemplified by glass fiber reinforced poly-phenylene-sulphide

Polymers and polymer composites are frequently used in tribological applications. However, their use is often limited by excessive wear or plastic deformation, therefore research and development aiming to improve the materials is ongoing. Tribological evaluations of polymer composites often study the friction coefficient and wear rate for different types, sizes and amounts of fillers. But rarely are any mechanisms presented. Although polymer materials differ from metals, the techniques typically used for metal components, for example, scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS), can be adapted to polymer materials, to achieve more informative SEM micrographs and EDS analyses. The aim of this article is to present useful analysis strategies, from sample preparation and selection of viewing angles, to selection of instrument settings and detector types. The strategies are exemplified by analysis of poly-phenylene-sulphide filled with glass fiber, evaluated against steel in a reciprocating ball-on-flat test set-up. This article takes its starting point with the worn surfaces, and subsequently analyze them using SEM and EDS. A selection of cross section preparation techniques, analysis parameters and microscopy settings are presented and discussed. By combining these techniques and settings, the observation of a strongly modified surface layer, as well as sub-surface plastic deformation and imbedded wear particles, is facilitated.     

空间齿轮传动副用材料离子注入改性工艺研究

对空间机械的齿轮传动副用材料进行Ti+N离子注入表面改性研究,考察不同注入能量和剂量条件下的改性材料的硬度和真空摩擦磨损性能,获得表面改性效果优异的离子注入工艺参数。结果表明,在注入能量为Ti+/45keV+N+/65 keV,注入剂量为7×1017cm-2的工艺参数条件下,改性材料的真空摩擦学性能相对最好,表面改性效果最佳。