Uchicago Argonne, LLC

Other

U.S. Department of Energy

Oyelayo O Ajayi

George R Fenske

Ali Erdemir

Osman Eryilmaz

Izhak Etsion

Kursat Kazmanli

Mustafa K Urgen

Lavern D Wedeven

Maria De La Cinta Lorenzo-Martin

Jeffrey G Hershberger

William F Black

Mark J Stimler

Maria De La Lorenzo-Martin

Aaron J Goodell

A method of mechanically processing a metallic material component is provided whereby alloying, carburizing, nitriding and boriding can be performed using a friction stir processing tool. This method for mechanically processing metallic material surfaces is cost effective, efficient and does not require specialized equipment.

Mechanical processing of metallic component surfaces

An article of method of manufacture of a low friction tribological film on a substrate. The article includes a substrate of a steel or ceramic which has been tribologically processed with a lubricant containing selected additives and the additives, temperature, load and time of processing can be selectively controlled to bias formation of a film on the substrate where the film is an amorphous structure exhibiting highly advantageous low friction properties.

Tribological synthesis method for producing low-friction surface film coating

Methods and compositions relating to the preparation of structurally and compositionally modulated composite surfaces that can potentially reduce friction and increase resistance to wear and scuffing in rolling, rotating and sliding bearing applications. Preparation of nano-to-micro size pores, holes, or dimples on a given solid surface and filling them with soft or hard coatings at desired thickness to achieve such properties.

Modulated composite surfaces

An improved process for the creation or formation of nanocrystalline layers on substrates' surfaces is provided. The process involves 'prescuffing' the surface of a substrate such as a metal by allowing friction to occur on the surface by a load-bearing entity making rubbing contact and moving along and on the substrate's surface. The 'prescuffing' action is terminated when the coefficient of friction between the surface and the noise is rising significantly. Often, the significant rise in the coefficient of friction is signaled by a change in pitch of the scuffing action sound emanating from the buffeted surface. The &#x201c;prescuffing&#x201d; gives rise to a harder and smoother surface which withstands better any inadequate lubrication that may take place when the &#x201c;prescuffed&#x201d; surface is contacted by other surfaces.

Method for producing functionally graded nanocrystalline layer on metal surface

Conventional liquid lubrication requires a compromise between high temperature properties for good lubrication and low temperature properties for pumpability. The major thrust of this invention is the preservation of the long life and reliable mechanism of elastohydrodynamic lubrication in the pursuit of elevated temperature lubrication. The mechanism of EHD lubrication is the primary source of lubrication for rolling element bearings, gears and other non-conforming contacting surfaces which must carry high loads over small areas of contact. The invention supplies the lubricant as a vapor which upon condensation provides an efficient replenishment of the inlet region to the elastohydrodynamic contact. The surfaces are encouraged to operate at elevated temperatures without cooling for reasons of efficiency. Broad temperature range EHD lubrication with perfluoroalkylpolyether fluids provide full EHD lubrication up to 500.degree. C. The enhanced temperature range, small fluid quantity and the supply of lubricant in a vapor environment eliminates the need for complex lubrication and cooling hardware. The vapor lubrication scheme when applied to a rolling element bearing provides lubrication to 500.degree. C. The invention provides high speed operation to 0.9 MDn (30,000 rpm with a 30 mm bore bearing) with the use of a driving air to overcome the internal windage generated by the high speed components.

Method and device for broad temperature range vapor lubrication

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Oswego, IL, United States of America

Oyelayo O Ajayi