Low sulfur outgassing free machining stainless steel disk drive components
US6181509A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1999 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Apr 23, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B25/043
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Embodiments include a disk drive having a drive motor assembly including at least one component selected from the group consisting of a rotatable hub, disk spacer, disk clamp, backiron, lower bearing bushing, and lower mounting flange. At least one of the components comprises a low sulfur outgassing free machining stainless steel material. The low sulfur outgassing free machining stainless steel material may include a free machining stainless steel that outgases sulfur at a rate insufficient to cause visually observable sulfide corrosion when tested by placing a copper strip into contact with the free machining stainless steel in an environment having a temperature of 50.degree. C. and 90% relative humidity for a 7 day test period and then observing the copper strip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.