Analysis of wear metals in perfluorinated fluids
US5506677A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 1995 |
| Grant date | Apr 9, 1996 |
| Priority date | — |
| Expiry date | Feb 21, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/71
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Soluble metal complexes for use as standards in wear metal analysis of PFPAE fluids are provided. These standards are the metal complexes of 2,2-dimethyl-6,6,7,7,8,8,8,-heptafluoro-3,5-octanedione (HFOD). These complexes are soluble in PFPAE's to at least 100 ppm metal and are stable over a long period of time (months) in the presence of air. Generally, the metals of interest are Al, Na, Mg, Ca, Ba, Ni, Cu, Zn, Cd, Pb, Hg, Fe, Cr, Mn, V, Mo, Si, Ag, Na, Sn, Ti and Co. Also provided is a method for determining the concentration of at least one wear metal in a PFPAE fluid. This method is particularly suitable for determining determining the concentration of at least one wear metal in a PFPAE fluid by inductively coupled plasma-atomic emission spectroscopy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.