General Electric Company

Sylvia M DeCarr

Bernard Patrick Bewlay

Timothy John Sommerer

James Scott Vartuli

James Anthony Brewer

Anteneh Kebbede

Sylvain S Coulombe

Luana Emiliana Iorio

Frederic Joseph Klug

Joan McKiever

John Patrick Pollinger

Kimberly Ann Polishchuk

Stephanie Lynn Knoeller

Luana E Lorio

Luana E Iorlo

A slurry composition includes, by volume, a ceramic composition in an amount of from about 60 to about 75 percent and a binder in an amount of from about 25 to about 40 percent, plus a platinum group metal catalyst and a dopant. The ceramic composition includes, by volume of the ceramic composition, fine fused silica particles having a particle size dof from about 4 &#x3bc;m to about 7 &#x3bc;m, in an amount of from about 7 to about 40 percent; coarse fused silica particles having a dof from about 25 &#x3bc;m to about 33 &#x3bc;m, in an amount of from about 29 to about 60 percent; inert filler particles having a dof from about 5 &#x3bc;m to about 25 &#x3bc;m, in an amount of from about 8 to about 40 percent; and fumed silica particles, in an amount of up to about 15 percent.

Ceramic slurry compositions and methods of use thereof

A hermetically sealed lamp having at least one seal-material-free bond. The seal material-free bond may be a material diffusion bond, a mechanically deformed bond such as a cold weld or crimp, a focused heat bond such as a laser bond, or any other such bond. For example, the hermetically sealed lamp may have one or more endcaps diffusion bonded to an arc envelope, such as a ceramic tube or bulb. The hermetically sealed lamp also may have one or more tubular structures, such as dosing tubes, which are mechanically closed via cold welding or crimping. Localized heating, such as the heat provided by an intense laser, also may be used to enhance any of the foregoing bonds.

Hermetical lamp sealing techniques and lamp having uniquely sealed components

A system and method for hermetically sealing a lamp. Certain embodiments of the lamp have an arc envelope having an open end and, also, an end structure diffusion bonded to the arc envelope at the open end. The end structure also has a dosing passageway extending into the arc envelope. In other embodiments, a lighting device is provided with an end structure adapted to close an open end of an arc envelope, and a dosing tube diffusion bonded to the end structure. Another embodiment of the lighting device has an arc envelope and an end structure diffusion bonded to an open end of the arc envelope.

A hermetically sealed lamp having at least one end-to-end seal. The end-to-end seal may be a material diffusion bond, a seal-material bond, or any other suitable bond. For example, the hermetically sealed lamp may have one or more endcaps butt-sealed to an arc envelope, such as a ceramic tube or bulb. The hermetically sealed lamp also may have one or more tubular structures, such as dosing tubes, which are butt-sealed to the endcap and/or arc envelope. Localized heating, such as the heat provided by an intense laser, also may be used to enhance any of the foregoing bonds.

Hermetical end-to-end sealing techniques and lamp having uniquely sealed components

HID lamp having material free dosing tube seal

A method of removing substantially all of the volatile component in a green, volatile-containing ceramic article is disclosed. The method comprises freezing the ceramic article; and then subjecting the frozen article to a vacuum for a sufficient time to freeze-dry the article. Frequently, the article is heated while being freeze-dried. Use of this method efficiently reduces the propensity for any warpage of the article. The article is often formed from a ceramic slurry in a gel-casting process. A method for fabricating a ceramic core used in investment casting is also described.

Method for removing volatile components from a ceramic article, and related processes

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Schenectady, NY, United States of America

Sylvia M DeCarr