Title:
BEARING WITH AMORPHOUS BORON CARBIDE COATING
Document Type and Number:
WIPO Patent Application WO2001094657
Kind Code:
A3
Abstract:
The raceways (18, 20) and/or rolling elements (15) of an anti-friction bearing (10) are coated with an amorphous boron-carbide coating having a dense microstructure. The coating has a thickness of about 0.1mm to about 5mm and is applied at low substrate temperatures and high adatom mobilities. Prior to applying the boron-carbide coating, an interfacial layer is applied to the bearing surface to help the boron-carbide coating to adhere to the surface. The interfacial layer is a metal layer that is deposited on the bearing surface, or a layer of boron and carbon atoms which are diffused into the bearing surface. If a metal interfacial layer is used, then, there is a gradual transition between the interfacial layer of pure metal and the boron-carbide coating. When the bearing assembly is coated in this manner, the bearing assembly will have a longer lifetime, have a cooler operation and higher rotational speeds, have an increased power density, and exhibit greater debris resistance than uncoated bearing assemblies.
Inventors:
DOLL GARY L
Application Number:
PCT/US2001/017185
Publication Date:
July 04, 2002
Filing Date:
May 24, 2001
Export Citation:
Assignee:
TIMKEN CO (US)
International Classes:
C23C14/02; C23C14/06; C23C16/02; C23C16/30; C23C16/32; F16C33/30; F16C33/32; F16C33/62; (IPC1-7): C23C14/02; C23C16/02; C23C14/06; C23C16/32; F16C19/00
Foreign References:
| EP1123989A2 | 2001-08-16 | |||
| US5593234A | 1997-01-14 | |||
| US5718516A | 1998-02-17 | |||
| EP1002964A1 | 2000-05-24 | |||
| US3726572A | 1973-04-10 |
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 12 31 October 1998 (1998-10-31)
Download PDF: