| 摘要 |
PCT No. PCT/GB95/01521 Sec. 371 Date Jan. 6, 1997 Sec. 102(e) Date Jan. 6, 1997 PCT Filed Jun. 28, 1995 PCT Pub. No. WO96/01956 PCT Pub. Date Jan. 25, 1996A back-up bearing arrangement (25) for a magnetic bearing (12, 13) includes a stationary dry running bearing material (30) and a rotable collar (26) which runs in abutment where with upon failure of the magnetic bearing. To avoid adhesive wear due to localised welding or melting of bearing material at surface asperities because of the inability of collar material (chosen to withstand centrifugal stresses at high rotation rates) to remove it adequately, the contact-making face of the collar is plated with a layer of copper on which is deposited a thin layer of titanium nitride. |
