摘要:

AbstractIn order for silahydrocarbons to qualify, for use in a broad range of applications (automotive, aerospace, and industrial), the formulated fluid must have good oxidative stability and lubricity.This paper compares the response of a silahydrocarbon, a synthetic hydrocarbon, and a mineral oil to various antiwear and antioxidant additives. A merit rating system is described: it provides a relative ranking of the different formulated fluids according to performance.

ISSN:0265-6582    

DOI:10.1002/jsl.3000100302

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY

摘要:

AbstractFriction and wear characteristics of a type of polyetheretherketone (PEEK)‐ based composite were evaluated under two different loading pressures and sliding speeds (P = 1.0 MPa, V = 1.0 m/s and P=2.0 Mpa, V=3.3 m/s). The material was in contact with steel surfaces of two different roughnesses (Ra=0.15 μm and Ra=0.33 μm). Interface temperature, coefficient offriction, depth wear rate, and specific wear rate of the polymer composite changed considerably with the PV value and the counterface roughness. The interface temperature increased with increasing PV value, whereas the friction coefficient decreased. The depth wear rate at the higher PV value was much higher than that at lower PV. In addition, the rougher counterface resulted in a higher friction coefficient, depth wear rate, and specific wear rate, when the PV value was fixed. The effect of counterface roughness on the specific wear rate at the higher PV value was smaller than that at the lower PV. Further variations in friction and wear with testing conditions are discussed along with the corresponding microscopic observations of the worn polymer surfaces and the polymer transferred counterfa

ISSN:0265-6582    

DOI:10.1002/jsl.3000100303

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY

摘要:

AbstractThe rheological properties of two lithium, two lithium complex, and two sodium greases, all with the most common NLGI grade two, have been investigated. The greases are based on a mineral and a synthetic oil. The apparatus used was a cone‐and‐plate rheometer and an impacting‐ball apparatus.The impacting‐ball apparatus used a steel ball, which impacted a lubricated sintered carbide plate, to measure the shear stress‐pressure coefficient, γ, of the lubricant. At pressures found in elastohydrodynamic contacts this coefficient determined the limiting shear stress. The γ‐value thus affects the coefficient of friction and consequently, lower γ‐value means less friction.The results from the impacting‐ball apparatus showed that the γ‐value was lower for the greases with a synthetic base oil and that the lithium greases gave a lower γ‐value than the corresponding base oils.Results from the cone‐and‐plate rheometer showed the characteristic shear thinning behaviour of the greases and the influence of shear history and temperature. The results from the cone‐and‐plate rheometer have also been fitted to a

ISSN:0265-6582    

DOI:10.1002/jsl.3000100304

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY

摘要:

AbstractResearch has been undertaken to identify new synthetic basestocks, to be used alone or with polyalphaolefins, for the formulation of high‐quality engine oils.Basestock selection was limited to products not normally used in the synthesis of ester‐type basestocks. A non‐conventional product was identified: a carbonic ester of synthetic alcohols. A complete engine oil has been formulated using this basestock and submitted to a full test programme. The results are rep

ISSN:0265-6582    

DOI:10.1002/jsl.3000100305

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000100306

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000100307

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000100308

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000100301

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY