Thermally stable, high temperature, samarium cobalt molding compound
US6737451B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2001 |
| Grant date | May 18, 2004 |
| Priority date | — |
| Expiry date | Mar 4, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/061
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A magnetic compound is formed comprising: (1) 25% to 50% by volume of polyphenylene sulfide (PPS); (2) 50% to 70% by volume of coated samarium cobalt (the coating comprising 1 to 30% Kaolin by weight of the coating and 70 to 99% potassium silicate by volume of the coating); and (3) 0% to 5% by volume of an internal lubricant. The PPS polymer component of the compound renders the compound amenable to be injection molded to precise tolerances and also has a low coefficient of linear thermal expansion. The samarium cobalt constituent of the compound provides thermal stability. The potassium silicate/kaolin coating separates the PPS from the samarium cobalt, thus preventing degradation (i.e, PPS viscosity reduction) during manufacture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.