The Composition of Surface Layers Formed in a Lubricated Cam/Tappet ContactSource: Journal of Tribology:;1991:;volume( 113 ):;issue: 001::page 38Author:P. A. Willermet
,
J. M. Pieprzak
,
D. P. Dailey
,
R. O. Carter
,
N. E. Lindsay
,
L. P. Haack
,
J. E. deVries
DOI: 10.1115/1.2920601Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The frictional behavior of two oils was measured in a cam/tappet friction apparatus using a direct acting bucket tappet geometry. One oil contained a soluble molybdenum friction modifier. The tappet was equipped with a removable friction disk, which allowed the frictional surface to be easily removed for surface characterization using surface profilometry, reflection infrared and XPS spectroscopies. The films consisted of varying amounts of inorganic phosphates, sulfates and sulfides with zinc, magnesium, and possibly molybdenum as cations. MoS2 , expected because additives containing molybdenum and sulfur were present, was not detected. The detection limit was less than 0.1 atom percent Mo. The film formed by the friction modified oil was thinner, smoother and contained small amounts of molybdenum. While the smooth surface finish could reduce friction by improving microelastohydrodynamic lubrication, friction reduction could not be tied to any of the chemical structures detected in these experiments.
keyword(s): Friction , Lubrication , Atoms , Reflection , Finishes , Disks , Geometry , Magnesium , molybdenum , Petroleum , Sulfur AND Surface characterization ,
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contributor author | P. A. Willermet | |
contributor author | J. M. Pieprzak | |
contributor author | D. P. Dailey | |
contributor author | R. O. Carter | |
contributor author | N. E. Lindsay | |
contributor author | L. P. Haack | |
contributor author | J. E. deVries | |
date accessioned | 2017-05-08T23:36:49Z | |
date available | 2017-05-08T23:36:49Z | |
date copyright | January, 1991 | |
date issued | 1991 | |
identifier issn | 0742-4787 | |
identifier other | JOTRE9-28487#38_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/109300 | |
description abstract | The frictional behavior of two oils was measured in a cam/tappet friction apparatus using a direct acting bucket tappet geometry. One oil contained a soluble molybdenum friction modifier. The tappet was equipped with a removable friction disk, which allowed the frictional surface to be easily removed for surface characterization using surface profilometry, reflection infrared and XPS spectroscopies. The films consisted of varying amounts of inorganic phosphates, sulfates and sulfides with zinc, magnesium, and possibly molybdenum as cations. MoS2 , expected because additives containing molybdenum and sulfur were present, was not detected. The detection limit was less than 0.1 atom percent Mo. The film formed by the friction modified oil was thinner, smoother and contained small amounts of molybdenum. While the smooth surface finish could reduce friction by improving microelastohydrodynamic lubrication, friction reduction could not be tied to any of the chemical structures detected in these experiments. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | The Composition of Surface Layers Formed in a Lubricated Cam/Tappet Contact | |
type | Journal Paper | |
journal volume | 113 | |
journal issue | 1 | |
journal title | Journal of Tribology | |
identifier doi | 10.1115/1.2920601 | |
journal fristpage | 38 | |
journal lastpage | 47 | |
identifier eissn | 1528-8897 | |
keywords | Friction | |
keywords | Lubrication | |
keywords | Atoms | |
keywords | Reflection | |
keywords | Finishes | |
keywords | Disks | |
keywords | Geometry | |
keywords | Magnesium | |
keywords | molybdenum | |
keywords | Petroleum | |
keywords | Sulfur AND Surface characterization | |
tree | Journal of Tribology:;1991:;volume( 113 ):;issue: 001 | |
contenttype | Fulltext |