Author(s): David W. Johnson | Matthew Bachus | John E. Hils
Journal: Lubricants
ISSN 2075-4442
Volume: 1;
Issue: 2;
Start page: 48;
Date: 2013;
Original page
Keywords: 440C Stainless Steel | phosphate ester | surface deposition | synthetic lubricant | decomposition
ABSTRACT
One way to improve fuel efficiency in today’s jet aircraft engines is to create an environment for higher operating temperatures and speeds. New and improved lubricants and bearing materials must be developed to remain stable in these elevated operating temperatures. Three lubricants, with varying amounts of tricresyl phosphate added as an anti-wear/extreme pressure additive were tested on two different stainless steels at varying temperatures ranging from 300 °C to 350 °C in vacuum. Significant decomposition of the lubricant base-stocks and the phosphate ester additive did occur in most of the trials resulting in the formation of carboxylic acids and phenols. In these cases a film containing phosphorus was deposited onto the stainless steel substrate.
Journal: Lubricants
ISSN 2075-4442
Volume: 1;
Issue: 2;
Start page: 48;
Date: 2013;
Original page
Keywords: 440C Stainless Steel | phosphate ester | surface deposition | synthetic lubricant | decomposition
ABSTRACT
One way to improve fuel efficiency in today’s jet aircraft engines is to create an environment for higher operating temperatures and speeds. New and improved lubricants and bearing materials must be developed to remain stable in these elevated operating temperatures. Three lubricants, with varying amounts of tricresyl phosphate added as an anti-wear/extreme pressure additive were tested on two different stainless steels at varying temperatures ranging from 300 °C to 350 °C in vacuum. Significant decomposition of the lubricant base-stocks and the phosphate ester additive did occur in most of the trials resulting in the formation of carboxylic acids and phenols. In these cases a film containing phosphorus was deposited onto the stainless steel substrate.
