Method pertaining to the operation of electric furnaces, and a furnace
US5946341A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1996 |
| Grant date | Aug 31, 1999 |
| Priority date | — |
| Expiry date | Jul 5, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27D2099/0008
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An electrically heated furnace includes an inner furnace chamber provided with heating elements of stabilized zirconium dioxide, and an outer furnace chamber in which further heating elements that can work at temperatures above 1800.degree. C. in an oxygen-containing atmosphere are provided. The outer heating elements are conveniently of a molybdenum silicide type, for instance elements marketed under the designation KANTHAL Super. Those walls that define the inner furnace chamber are made of zirconium dioxide material or some other suitable material that has a low specific thermal conductivity and that is capable of withstanding the high working temperature and the occurrent temperature swings. The outer furnace chamber, which completely surrounds the inner furnace chamber, is separated from the surroundings by conventional walls insulated, e.g., with ceramic fibres and/or high-temperature durable brick.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.