摘要:

AbstractHigh‐temperature polymers are generally preferred for those tribology applications where cost is secondary and performance is the primary consideration. Since frictional heat dissipation limits the usefulness of polymers because of their poor thermal conductivity, high‐temperature polymers are preferred in applications which have harsh operating conditions. In this paper, a high‐temperature polymer, polyethersulphone (PES), was selected for some adhesive wear studies, along with two PES composites containing 18% glass‐fibre (GF) reinforcement and two solid lubricants, i.e., PTFE and MoS2(2% each). Adhesive wear studies of these materials on two pin‐on‐disc machines indicated that neat PES was not a good tribo‐material. However, incorporation of GF and solid lubricants enhanced the wear performance by an order of two. PTFE was found to behave better than MoS2. However, after long sliding duration both the lubricants performed almost equally well. The topography of the surface of the pins and the disc was studied using SEM to investigate the we

ISSN:0265-6582    

DOI:10.1002/jsl.3000170202

出版商:John Wiley&Sons, Ltd    

年代:2000

数据来源: WILEY

摘要:

AbstractFour research areas at the NASA Glenn Research Center in the United States, involving the tribology of space mechanisms, are highlighted. These areas include: soluble boundary lubrication additives for perfluoropolyether liquid lubricants, a Pennzane® dewetting phenomenon, the effect of non‐ozone depleting chemical bearing cleaning processes on bearing lifetimes, and the development of a new class of liquid lubricants based on silahydrocarbo

ISSN:0265-6582    

DOI:10.1002/jsl.3000170203

出版商:John Wiley&Sons, Ltd    

年代:2000

数据来源: WILEY

摘要:

AbstractCryo‐treatment, a bulk modification technique, is fast emerging as a way with which to improve the wear resistance of metals. This technique has also shown the ability to enhance significantly the abrasive wear performance of some polymers and their short glass‐fibre reinforced composites. In this work, short carbon‐fibre reinforced composites of some heat resistant polymers, such as polyetherimide, polyethersulphone, polyamide 6,6, polyetheretherketone, and polytetrafluoroethylene, were selected to explore the potential of cryo‐treatment. The selected materials were cryogenically treated by cooling them to the temperature of liquid nitrogen. The abrasive wear tests were carried out at ambient temperature in single pass conditions at various loads, on a pin‐on‐disc machine, using silicon carbide paper as a counterface. The investigations revealed that this technique has definite potential to increase the wear performance of carbon‐fibre reinforced composites. An increase in hardness due to cryo‐treatment was thought to be responsible for an observed improvement in wear performance. However, the extent of improvement in the wear performance was not matched by an increase in the hardness value. Scanning electron microscopy proved useful in examining the morphological changes in the composites due to

ISSN:0265-6582    

DOI:10.1002/jsl.3000170204

出版商:John Wiley&Sons, Ltd    

年代:2000

数据来源: WILEY

摘要:

AbstractThe requirement for environmentally adapted lubricants has begun to play an increasingly important role in many industrial applications, particularly in the last two decades. The present‐day requirements for biodegradable and eco‐friendly lubricants imply that lubricants have properties that can minimise, if not eliminate, negative environmental impact, such as contamination of soil and water, caused by lost lubrication, leakage and accidents. The dominant factors that have a direct impact on the environment and which characterise the lubricant and its chemical composition, are toxicity, bio‐accumulation and biodegradability. Biodegradability is perhaps the most important factor which determines the fate of lubricant in the environment.Various commercial, governmental, and regulatory initiatives exist that protect the interests of the consumer. Life cycle analysis can help in assessing the total environmental impact of lubricants. This paper reviews the essential requirements of environmentally adapted lubricants, i.e., chemical composition, eco‐toxicity, biodegradability, bio‐accumulation, and eco‐labelling schemes, and life cyc

ISSN:0265-6582    

DOI:10.1002/jsl.3000170205

出版商:John Wiley&Sons, Ltd    

年代:2000

数据来源: WILEY

摘要:

AbstractLow friction coefficients, i.e., below 0.10, in mineral oil based lubricants have been traditionally obtained using glycerol mono oleate, molybdenum dithiocarbamate or molybdenum dithiophosphate. In aqueous systems this is more difficult to achieve, and wear protection is also problematic due to the polar nature of the substrate. There is substantial interest in low toxicity/ecotoxicity additives, especially in metalworking fluid applications, where disposal of the finished fluid can be expensive. In this paper, a novel ashless (metal‐free) friction modifier with antiwear properties, specifically designed for aqueous systems, is reviewed. This additive does not contain phosphorus, sulphur, or halogens. Some preliminary results in water based lubricants, for example, polyalkylene glycols, for metal forming applications are presente

ISSN:0265-6582    

DOI:10.1002/jsl.3000170206

出版商:John Wiley&Sons, Ltd    

年代:2000

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000170207

出版商:John Wiley&Sons, Ltd    

年代:2000

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000170208

出版商:John Wiley&Sons, Ltd    

年代:2000

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000170209

出版商:John Wiley&Sons, Ltd    

年代:2000

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000170201

出版商:John Wiley&Sons, Ltd    

年代:2000

数据来源: WILEY