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US 5,350,927 AGranted
Radiation emitting ceramic materials and devices containing same
AssigneeMitech Scientific Corp.
InventorsRoustam K. Rakhimov, Elena V. Kim
Life of this patent
Estimating the term…
Abstract
The disclosed invention is directed to novel ceramic compositions, and to stabilizer compositions for use with those ceramic compositions. The ceramic materials are formed of rare earth chromium oxides that include a novel combination of stabilizing compounds. Also, dryer or sterilizer devices which incorporate these ceramic compositions for generating infrared radiation for drying or sterilizing various articles.
Claims23
An apparatus for drying or sterilizing articles comprising:
- a chamber for receiving articles to be dried or sterilized;
- means for providing energy within the chamber;
- and
- a first ceramic material comprising a rare earth chromium oxide composition and a stabilizing composition comprising sufficient amounts of an alkaline earth spinel and an alkaline earth chromate which, in combination, stabilize the rare earth chromium oxide composition, wherein said ceramic material is associated with the chamber for receiving and absorbing energy from the providing means and for emitting infrared radiation of one or more selective wavelengths which radiation is directed toward the articles for drying or sterilization thereof.
1 more element
An apparatus for drying or sterilizing articles comprising:
- a chamber for receiving articles to be dried or sterilized;
- means for providing energy within the chamber;
- and
- a first ceramic material comprising a rare earth chromium oxide and a stabilizing composition comprising sufficient amounts of an alkaline earth spinel and an alkaline earth chromate which, in combination, stabilize the rare earth chromium oxide composition, and at least one of (a) an oxide of zirconium or hafnium in an amount of about 0.5 to 5 weight percent of the ceramic composition, (b) a chromate of yttrium, scandium, ytterbium, or terbium in an amount of about 0.5 to 5 weight percent of the ceramic composition, or (c) an oxide of cerium, dysprosium, lutetium, or europium in an amount of about 0.1 to 1 weight percent of the ceramic composition, said ceramic material associated with the chamber for receiving and absorbing energy from the providing means and for emitting infrared radiation of one or more selective wavelengths which radiation is directed toward the articles for drying or sterilization thereof.
1 more element
An apparatus for drying or sterilizing articles comprising:
- a chamber for receiving articles to be dried or sterilized;
- means for providing energy within the chamber;
- a first ceramic material comprising rare earth chromium oxide and a stabilizing composition comprising sufficient amounts of an alkaline earth spinel and an alkaline earth chromate which, in combination, stabilize the rare earth chromium oxide composition, the ceramic material associated with the chamber for receiving and absorbing energy from the providing means and for emitting infrared radiation of one or more selective wavelengths which radiation is directed toward the articles for drying or sterilization thereof;
- and
- a second ceramic material comprising Cr.sub.2 O.sub.3 which includes SiO.sub.2, Fe.sub.2 O.sub.3 and one or more of the following additives:
- Al.sub.2 O.sub.3, CuO, CaO or MgO, wherein said second ceramic material is associated with the chamber for receiving and absorbing infrared radiation from the first ceramic material and for emitting infrared radiation of one or more selective wavelengths, which radiation is different from that emitted by the first ceramic material and is directed toward the articles for drying or sterilization thereof.
3 more elements
An apparatus for drying or sterilizing articles comprising:
- a chamber for receiving articles to be dried or sterilized;
- means for providing energy within the chamber;
- and
- a ceramic material comprising Cr.sub.2 O.sub.3 which includes SiO.sub.2, Fe.sub.2 O.sub.3 and one or more of the following additives:
- Al.sub.2 O.sub.3, CuO, CaO or MgO, wherein said ceramic material is associated with the chamber for receiving and absorbing energy from the providing means and for emitting infrared radiation of one or more selective wavelengths which radiation is directed toward the articles for drying or sterilization thereof.
2 more elements
Dependencies are inferred from the claim text.