Bearings – Rotary bearing – Antifriction bearing
Patent
1995-05-16
1997-01-14
Turner, Archene
Bearings
Rotary bearing
Antifriction bearing
384297, 384565, 384569, 384907, 384912, 384913, 428216, 428336, 428469, 428408, 428698, 428701, 428702, 428704, F16C 3332
Patent
active
055932347
ABSTRACT:
An improved bearing assembly includes a superhard polycrystalline superlattice coating disposed on one or more surfaces. The coating is formed in layers from materials selected from the group consisting of ceramics, metals, alloys, nitrides, borides, carbides and oxides of transition metals, other metals and alloys, carbon, and combinations thereof. The bearing assembly includes a first race having a first load supporting surface and a second race disposed in a spaced relation with said first race, wherein the second race has a second load supporting surface. The bearing assembly further includes a rolling element assembly disposed in communication with the first race and the second race and sized for rolling movement between the first load supporting surface of the first race and the second load supporting surface of the second race. Preferred selections for the coating material are composite coatings including two or more layers of a titanium nitride
iobium nitride period or a titanium nitride/carbon nitride period in a multiple-period arrangement. The bearing assembly having this coating is operable for enhanced durability.
REFERENCES:
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Thom, Robert et al., Rolling Contact Fatigue Tests of Reactively Sputtered Nitride Coatings of Ti, Zr, Hf, Cr, Mo, Ti-Zr and Ti-Al-V on 440C Stainless Steel Substrates, Surface and Coatings Technology, vol. 62, pp. 423-427 (1993).
Sproul, William D. et al., Reactive Unbalanced Magnetron Sputterng of the Nitrides of Ti, Zr, Hf, Cr, Mo, Ti-Al, Ti-Zr, and Ti-Al-V, Surface and Coatings Technology, vol. 61, pp. 139-143 (1993).
Chu, X. et al., Mechanical Properties and Microstructures of Polycrystalline Ceramic/Metal Superlattices: TiN/Ni and TiN/No.sub.0.9 Cr.sub.0.1, Surface and Coatings Technology, vol. 61, pp. 251-256 (1993).
Chu, X. et al. Deposition and Properties of Polycrystalline TiN/NbN Superlattice Coatings, J. Vac. Sci. Technol. A 10(4), p. 1604, Ju.l/Aug. 1992.
Copending U.S. Patent Application Ser. No. 07/973,390, Filed: Nov. 9, 1992, Title: Polycrystalline Superlattice Coated Substrate and Method/Apparatus for Making Same, Applicant: Scott A. Barnett et al.
Chu, X. et al., "Reactive unbalanced magnetron sputter deposition of polycrystalline TiN/NbN superlattice coatings," Surface and Coatings Technology, vol. 57, pp. 13-18 (1993).
Sproul, William D. et al., "Multi-Layer, Multi-Component, and Multi-Phase PVD Coatings for Enhanced Performance," Abstract number: 44, Invited Paper, to be presented at the American Vacuum Society's 40th National Symposium, Orlando, Florida, Nov. 17, 1993 and to be submitted for publication in the Journal of Vacuum Science and Technology.
Chang, T. P., "Friction and Wear of Carbon Nitride and Titanium Nitride/Niobium Nitride Superlattice Coatings," Abstracts of presentations made at the 50th STLE Annual Meeting, May 14-19, Hyatt Regency Hotel, Chicago, Illinois (1995).
NTN Corporation
Turner Archene
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