Metal substrate with insulative coating thereon and method of making the same
US5512324A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1994 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Nov 14, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J35/56
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention includes a metal substrate having an insulative coating thereon, wherein the insulative coating is prepared from a composition including .gamma.-alumina (gamma alumina) with a wide particle size distribution that includes at least 10 percent of the particles having by weight being larger than 20 micrometers, 5 to 10 percent by weight pseudo-boehmite, and a catalyst. The composition is sprayed onto the metal substrate at a distance from about 12 to about 15 inches using a round orifice spray nozzle operated at a pressure ranging from about 15 to about 25 psi. A polyvinyl alcohol overcoat is applied to the insulative coating to prevent flaking and chipping when coated metal substrate are stacked on each other. The insulative coating is particularly useful on folded foils used to construct metal monoliths for electrically heating catalytic converters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.