Ceramic heater and a process for producing the same
US4652727A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1985 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | Oct 25, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49085
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The ceramic heater of the present invention is used as a regenerating heater for a carbon particulate collecting filter. The ceramic heater comprises a heat-generating body composed of a sintered body which comprises an electroconductive ceramic, such as titanium nitride, and an insulating material, such as silicon nitride. An electroconductive layer is formed on a selected portion of the surface of the heat-generating body. The ratio of the electroconductive ceramic ingredient of the electroconductive layer is greater than the ratio of the electroconductive ceramic ingredient of the heat-generating body. The electroconductive layer of the ceramic heater is formed by partially heat-decomposing silicon nitride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.