摘要:

AbstractLow molecular weight chlorotrifluoroethylene (CTFE) oligomers have been the base fluid for an extensive DoD research and development programme for nonflammable hydraulic fluids, compatible elastomeric seals, components, and systems. To gain a more fundamental understanding of the effect of the specific isomers and other components of commercial CTFE fluids on the important fluid properties, model compounds were synthesised and their physical and chemical properties were determined. Thermal stability, in the presence of typical hardware system metals, is one of the more important properties and is discussed in relation to molecular structure. Two Microscale evaluation techniques were devised and validated. Optimum thermal stability is observed when the chlorines in the molecules are positioned as far apart as possible. In general, it was found that the compounds with larger amounts of chlorine were less stable and the positioning of the chlorine in the molecule had a lesser, but measurable effect.

ISSN:0265-6582    

DOI:10.1002/jsl.3000110302

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractOwing to the great interest in the medical field in the tribological couple UHMWPE–Ti6Al4V, its wear behaviour was studied and compared to that displayed by the more typical couples of UHMWPE–AISI 316 and UHMWPE–Vitallium.The Ti6Al4V alloy was given three different surface treatments: (a) a conventional lapping procedure; (b) a special lapping procedure; (c) nitrogen ion‐implantation at 873°K. The last two samples induced, on a UHMWPE countetace, a wear rate lower than a factor of 10 compared to diamond lapped specimens; their behaviour was also better than the couples UHMWPE–AISI and UHMWPE–Vitallium.Wear improvement was attributed to the reduction of polymer transfer and adhesion on the metal counterface, due to the reduction of adhesive affinity between UHMWPE and the metal following surface treatment of the metal. The results are interpreted on the grounds of TEM and

ISSN:0265-6582    

DOI:10.1002/jsl.3000110303

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractOwing to growing environmental concerns, vegetable oils are finding their way into lubricants for industrial and transportation applications. Vegetable oils can of Ser significant environmental advantages with respect to resource renewability and biodegradability, as well as offering satisfactory performance in a variety of applications. Synthetic ester‐based fluids may also offer these advantages, however their cost can be prohibitively high. Formulating with vegetable oil does, however, present unique challenges. These are, most notably, the oxidative and hydrolytic instability and low temperature problems associated with the triglyceride. However, through advanced plant breeding techniques, vegetable oils are becoming available which exhibit excellent thermal and oxidative stability and other improved performance properties. The cost of these oils is much lower than synthetic esters, thereby making them attractive ‘environmental’ base f

ISSN:0265-6582    

DOI:10.1002/jsl.3000110304

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractThe load‐carrying capacity, wear, and friction properties of four S‐(1 H‐Benzotriazol‐1‐yl)methyl N,N‐dialkyldithiocarbamates added to a synthetic lubricant (diester) were evaluated using a four‐ball test machine and an Optimal SRV tester. The results indicate that these compounds added to the diester possess good load‐carrying capacities and antiwear properties. The rubbed surfaces were investigated using X‐ray photoelectron spectroscopy (XPS) analysis and the antiwear mecha

ISSN:0265-6582    

DOI:10.1002/jsl.3000110305

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000110306

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000110307

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000110308

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000110309

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000110301

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY