Lamp having an envelope with an oxidation resistant seal employing a unidirectional carbon fiber mat infiltrated with SiC
View Patent ↗There is described a lamp having a high-temperature glass envelope, at least one feedthrough assembly, and a light source disposed within the envelope; the at least one feedthrough assembly having an inner electrical lead connected to the light source, an outer electrical lead for conducting electrical energy from an outside source to the light source, and an intermediate connector electrically connecting the inner and outer electrical leads, the intermediate connector being resistant to oxidation within a temperature range up to 1200° C. and having a thermal expansion coefficient in the range of 0-2 ppm/° C.; and the intermediate connector being sealed within a seal area of the envelope.
1. A lamp, comprising:
a high-temperature glass envelope, at least one feedthrough assembly, and a light source disposed within the envelope;
the at least one feedthrough assembly having an inner electrical lead connected to the light source, an outer electrical lead for conducting electrical energy from an outside source to the light source, and an intermediate connector electrically connecting the inner and outer electrical leads, the intermediate connector comprising a uni-directional carbon fiber mat infiltrated with SiC and being resistant to oxidation within a temperature range up to 1200° C. and having a thermal expansion coefficient in the range of 0-2 ppm/° C.; and
the intermediate connector being sealed within a seal area of the envelope.
2. The lamp of claim 1 wherein the high-temperature glass is fused quartz or fused silica.
3. The lamp of claim 1 wherein the light source is a tungsten filament.
4. The lamp of claim 1 wherein the light source is an arc discharge.
5. The lamp of claim 1 wherein the light source is further contained within an inner envelope.
6. The lamp of claim 1 wherein the envelope is disposed within an outer jacket.
7. A feedthrough assembly for sealing in a high-temperature glass, the assembly comprising an inner electrical lead, an outer electrical lead and an intermediate connector that electrically connects the inner and outer electrical leads, the intermediate connector comprising a uni-directional carbon fiber mat infiltrated with SiC and being resistant to oxidation within a temperature range up to 1200° C. and having a thermal expansion coefficient in the range of 0-2 ppm/° C.