摘要:

Polyolefin fluids covering a wide viscosity range have been produced in quantities sufficient for direct comparison with petroleum oils and with existing synthetic-lubricants. Preliminary studies, conducted to choose the best synthesis route, revealed that hydrogenated oligomers of octene-1 offered the optimum balance of high viscosity index, low pour point and excellent stability. Further work with alpha-olefin blends, aimed at the most economical approach, now shows that essentially equivalent results can be obtained with the proper blend of C6to C10olefins. Such fluids when produced in large volumes could compete economically with present synthetics. Tests on two candidate products—an automatic transmission fluid for high-temperature service and a jet engine lubricant—demonstrate product capabilities under conditions which cannot be satisfied with conventional petroleum oils.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972116

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

A new class of stable aromatic fluids structurally related to the polyphenyl ethers are described. Designated as aromatic C-ethers, they are characterized by resistance to degradation by oxidation, heat, ionizing radiation, and hydrolysis. They are oxidatively stable in the temperature range of 500–600 F and have thermal decomposition temperatures above 700 F. Acceptable damage levels are observed at radiation dosage rates up to 107rads at 375 F. The C-ethers offer considerable promise as high-temperature lubricants with outstanding gear load-carrying capacities. The fluids are compatible with many elastomers and most engineering materials and are essentially nontoxic.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972117

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

A new class of high-temperature fluids, designated PR-143, which are capable of use in the range of −50 to −700 F, is discussed. These fluorinated materials do not sludge or tar on high-temperature exposure, even in the presence of air. The fluids are being tested in hydraulic systems, as gas turbine engine oils and as base fluids for high-temperature greases (designated PR-240). Properties and test results related to these applications are given.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972118

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

A new family of lubricants, hybrids between silicones and hydrocarbons, is introduced and characterized. The physical properties of representative members of the series are presented and their exceptional lubricating ability is shown. A possible mechanism for such lubricity is postulated.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972119

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

Chlorophenyl substituted silicones have better lubricating properties than lightly phenylated methyl silicones with similar physical properties. The best load-carrying and anti-wear properties are obtained with fluorosilicones at some loss in low-temperature properties. This paper describes a new class of silicone copolymers containing both trifluoropropyl and halophenyl substitution which can cover a temperature span of −100 F to 650 F. Data are included showing that this combination improves both low and heavy load anti-wear properties for steel. Physical, friction and wear, and stability data are given describing these properties as a function of the type, and amount of halogen on the phenyl as well as with varying ratios of trifluoropropyl to halophenyl substitution. Differences in lubricating performances and mechanisms for various halogenated groups are discussed to explain the improvements noted for the combination of halophenyl with trifluoropropyl groups. Final formulation of a potential wide temperature range hydraulic fluid is described.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972120

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

This paper reports on the research to develop a fire-resistant hydraulic fluid for aerospace vehicles. Model compounds containing halogen, phosphorus, and nitrogen in five chemical classes are characterized and compared to currently used materials with emphasis on rheological properties and fire resistance as measured by autogenous ignition, 1300 F molten metal test, flash and fire points. The chemical classes covered were: (1) partially fluorinated aliphatics (hydrocarbons, silicates, esters, amines), (2) halogenated ω,ω′-bis(aryldimethyl-silyl)alkanes, (3) fluoroaromatic ethers, (4) halogenated ω,ω′-diphenylalkanes, and (5) phosphorus esters.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972121

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

Five fluids (a dimethyl silicone, a silicate ester, a branched chain chloro-fluorocarbon, a cyclic fluorinated ether and a fluorinated polyether) were evaluated for use as the fluid in a single pass, gas actuated hydraulic system capable of operation from −150 to 275 F. Important physical and chemical properties, including thermal stability, lubricity, viscosity, pour, low-temperature characteristics and flash point, were determined. Specific heat, thermal conductivity and density values were compiled from manufacturer's data. The fluorinated polyether was chosen as the most suitable fluid for the low-temperature system.

ISSN:0569-8197    

DOI:10.1080/05698196608972122

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

Several layered solids, which are effective solid lubricants, have a strong affinity for methylene groups. This leads to preferential adsorption on the solids of those paraffinic molecules that can form the maximum number of contacts with the surface and with each other. Thus the strength of adsorption of mineral oils increases with their average molecular weight.

ISSN:0569-8197    

DOI:10.1080/05698196608972123

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

The work to be described in this paper, is a study of chemical reaction between iron surfaces and various representative extreme pressure (EP) agents, such as chlorine type, sulfur type, Zn-dithiophosphate type, and the mixture of sulfur and chlorine type EP agents, by using the hot wire method. It has been observed that the corrosion rate of iron follows the parabolic law or the cubic law. The parabolic law can be explained by the diffusion mechanism of corrosion. In order to explain the cubic law, the corrosion retarding action of a barrier film has been assumed. From the X-ray analysis of reaction products, the complexity of corrosion process has been revealed. Zinc-diisobutyldithiophosphate has shown the characteristic behavior in the corrosion process, showing retardation against the corrosion. With a binary additives system, the joint reaction of sulfur and chlorine compounds on iron could not be satisfactorily supported in the scope of this study. Some interesting considerations are given for the correlation between chemical reactivity and load carrying capacity of oils containing EP agents.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972124

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor

摘要:

Dynamic friction and static immersion tests in which oil temperature was varied and dynamic friction tests in which load was varied have been run on steel balls with oil blends containing seven commercial additives. Analyses of the ball surfaces by X-ray fluorescence have shown that significant surface coating formation is initiated at calculated surface temperatures of from 250 to 350 F for most of the additives studied. Although the surface coating “thickness” generally increased with temperature, the rate of increase was generally different for the static and dynamic tests. Both surface temperature and mechanical shearing appear to influence the reactions responsible for the surface coatings. Used oil analyses showed that base oil oxidation, additive decomposition, and, in some cases, sludge formation became detectible at temperatures corresponding to the start of significant surface coating formation. The results suggest that in situ polymerization may be an important phenomenon occurring on rubbing surfaces.Presented as an American Society of Lubrication Engineers paper at the Lubrication Conference held in San Francisco, Calif., October 18–20, 1965.

ISSN:0569-8197    

DOI:10.1080/05698196608972125

出版商:Taylor & Francis Group    

年代:1966

数据来源: Taylor