Lubricating behavior of iron rhenate and its relation to matching pairs

The iron rhenate was compounded by chemical method, which may be generated during wear process of Fe-Re alloys at elevated temperature. The friction coefficient of iron rhenate has been determined by a pin-on-disc device. The results show that iron rhenate plays role of lubricating at RT-600 °C. The lubricating behavior is related to the matching pairs. The hardness of the materials of matching pairs, compatibility of iron rhenate with materials of matching pairs and surface roughness of disc affect the lubricating behavior of iron rhenate mostly. The principle of matching pairs is proposed. Project supported by the National Natural Science Foundation of China Synopsis of the first author Xiong Dangsheng. associated professor, born in 1960. Current research fields include high-temperature self-lubricating alloys and tribological properties of material.     

Effects of lubrication and humidity on the abrasiveness of a thin boron carbide coating

Studies using thin boron carbide (B₄C) coatings have previously been performed in order to investigate their potential use as finite-life run-in coatings. Such coatings have been shown to polish the mating surface in a relatively short time. The inherent ability of these coatings to polish can potentially allow them to function as finite-life run-in coatings. Employing such coatings requires a thorough understanding of the parameters which directly influence the changes that occur in the coating abrasiveness throughout the duration of the polishing process. In past studies, changes in the coating abrasiveness during dry sliding wear under ambient conditions have been investigated. However, both lubrication and humidity can strongly influence the abrasive wear process. In this study, the influences of the operating environment, namely humidity and lubrication, on the coating abrasiveness are directly investigated. The coating abrasiveness decreases at a slower rate when a lubricant is added and when the humidity decreases.     

Effects of Load Direction on Performance of Tiliting Pad Journal Bearings

At the previous works for tilting journal pad bearings （TPJBs）, most TPJBs are designed to operate with the load either directly on-pad（LOP） or directly between-pad（LBP）. However, in practice, in some cases, the load direction can change dramatically in operation. With the current requirements for the analysis of dynamic characteristics of the rotor-bearing systems, the effects of the load direction on the bearing performance must be known. So, in this paper, the effects of load direction on the static and dynamic characteristics of TPJBs are obtained with theoretical analysis based on the hydrodynamic lubrication theory, and the influence of load direction on the performance of TPJBs in different structure and operating parameters is also analysed. The results show that the load direction has considerable effects on the static and dynamic characteristics of the TPJBs, especially for the TPJBs that are operating under heavy load and high rotor speed. And for the operating condition that load direction changed rapidly, TPJBs with more pads, smaller length to diameter ratio, larger clearance ratio and smaller perload ratio can reduce the performance fluctuation with the variation of load direction.     

润滑与冷却系统数字化设计平台研究

采用数字化设计技术不仅有利于提高大型装备的设计质量,而且能够缩短研制时间和降低研制成本,因此具有十分明显的学术价值和应用价值。本文以航空发动机中的润滑与冷却工作系统为研究对象,建立了针对这一系统的数字化设计平台,并对其中的关键技术问题进行了研究和分析。本文的研究方法和成果亦为类似的其它装备系统的数字化设计工作提供了参考依据。     

ZDRH-3000智能集中润滑系统在265m2烧结机的应用

介绍了ZDRH-3000智能集中润滑系统的主妥功能及在265m。烧结机上应用的效果。     

纳米固体材料在润滑剂中的应用

介绍了固体润滑材料的结构,固体纳米颗粒的制备方法、润滑机理以及作为润滑添加剂的应用情况,认为纳米固体材料具有广阔的应用前景。     

Lubrication Studies with Alumina-on-Alumina, Steel-on-Steel, and Steel-on-Alumina Bearing Systems

In metal bearing systems, good lubricants for boundary lubrication generally show chemical interaction with the bearing surface under the conditions of temperature and pressure generated in the sliding contact. In this study, tests in a four-ball wear tester have been used to compare lubricants under similar loadings using steel-on-steel, steel-on-alumina, and alumina-on-alumina bearing systems. In general, the alumina appears to be far less reactive with lubricants than steel. Alumina-on-alumina bearing systems do show a sensitivity to lubricant chemical composition with generally higher wear values than the other two bearing systems. Steel-on-alumina bearing systems generally show better wear characteristics than the all-alumina systems which indicates the improved chemical interactions between the steel and the lubricant. This study shows that the chemical reactivity of the lubricant with the bearing surface is important in the wear process.     

机载光电稳定平台润滑

根据机载光电稳定平台结构形式及使用环境,指出油脂润滑是稳定平台最佳润滑方式.通过对比平台轴承润滑前后的阻力矩差异,并用MATLAB作为工具分析该阻力矩对稳定精度影响情况,给出光电稳定平台对润滑脂性能要求和选用原则.     

铜及铜合金表面改性研究的可行性

钢铁渗硫提高了钢铁零部体的自润滑性能，从而提高耐磨件寿命。从这一观点出发，分析铜及铜合金渗硫的可能性，改善铜及铜合金零件的耐磨性，延长部件寿命，把辉光放电渗硫这一新技术引用到铜及铜合金表面改性的研究。     

新型4 400mm瓦楞原纸机

介绍了4 400 mm瓦楞原纸机各个部分的配置和特点。