Method for eliminating carbon contamination of platinum-containing components for a glass making apparatus

In the formation of sheet material from molten glass, molten glass is formed in a melting furnace and transported through a precious metal delivery system to the forming apparatus. Disclosed herein is a method to mitigate carbon contamination of individual components of the precious metal delivery system prior to and/or during their use. The method involves coating portions of the precious metal with an oxygen generating material prior to assembly of the component, and may comprise one or more heat treating steps of the component in an oxygen-containing atmosphere.

METHOD FOR ELIMINATING CARBON CONTAMINATION OF PLATINUM-CONTAINING COMPONENTS FOR A GLASS MAKING APPARATUS

In the formation of sheet material from molten glass, molten glass is formed in a melting furnace and transported through a precious metal delivery system to the forming apparatus. Disclosed herein is a method to mitigate carbon contamination of individual components of the precious metal delivery system prior to and/or during their use. The method involves positioning an oxygen generating material within portions of a precious metal component, and may comprise one or more heat treating steps of the component in an oxygen-containing atmosphere. 1. A method of removing carbon contamination from an interior volume of a platinum-containing component comprising:providing a platinum containing component comprising a hollow interior portion and a passage extending between an ambient atmosphere outside the platinum containing component and the hollow interior portion;positioning a gas supply tube into the hollow interior portion through the passage;flowing an oxygen-containing gas through the gas supply tube into the interior hollow portion of the platinum-containing component such that a pressure within the hollow interior portion of the platinum-containing component is greater than a pressure of the ambient atmosphere; andheating the platinum containing component to a temperature greater than about 1400° C.2. The method according to claim 1 , wherein the platinum-containing component is in contact with a molten glass material during the heating.3. The method according to claim 1 , wherein the platinum-containing component is a shaft of a glass stirring apparatus.4. The method according to claim 1 , wherein the gas supply tube does not contain platinum.5. The method according to claim 2 , wherein at least a portion of the platinum-containing component is immersed in a molten glass material.6. A method of removing carbon contamination from an interior volume of a platinum-containing component comprising:providing a platinum containing component comprising a hollow interior ...

DELAMINATION RESISTANT GLASS CONTAINERS

Embodiments of glass containers resistant to delamination and methods for forming the same are disclosed. According to one embodiment, a delamination resistant glass container may include a glass article having a body extending between an interior surface and an exterior surface. The body defines an interior volume. The body may include an interior region extending from 10 nm below the interior surface of the body into a thickness of the body. The interior region has a persistent layer homogeneity such that the body is resistant to delamination. 1. A delamination resistant glass container comprising:a glass article having a glass body extending between an interior surface and an exterior surface and defining an interior volume;an interior region extending from about 10 nm below the interior surface of the body into a thickness of the body and having a persistent layer homogeneity such that the body is resistant to delamination.2. The glass container of claim 1 , wherein the glass article is formed from a glass composition which has a 1000 poise temperature of less than or equal to about 1700° C.3. The glass container of claim 1 , wherein the glass article is formed from a glass composition which is ion-exchangeable.4. The glass container of claim 1 , wherein the interior region has a thickness Tof at least about 100 nm.5. The glass container of claim 1 , wherein the interior region has a thickness Tof at least about 200 nm.6. The glass container of claim 1 , wherein the interior region has a thickness Tof at least about 350 nm.7. The glass container of claim 1 , wherein the interior region has a thickness Tof at least about 500 nm.8. The glass container of claim 1 , wherein the glass article is formed from a glass composition that comprises less than or equal to about 1.0 mol. % of oxides of boron and less than or equal to about 1.0 mol. % of compounds containing boron.9. The glass container of claim 1 , wherein the glass article is formed from a glass composition ...

DELAMINATION RESISTANT GLASS CONTAINERS WITH HEAT-TOLERANT COATINGS

Delamination resistant glass containers with heat-tolerant coatings are disclosed. In one embodiment, a glass container may include a glass body having an interior surface, an exterior surface and a wall thickness extending from the exterior surface to the interior surface. At least the interior surface of the glass body is delamination resistant. The glass container may further include a heat-tolerant coating positioned on at least a portion of the exterior surface of the glass body. The heat-tolerant coating may be thermally stable at temperatures greater than or equal to 260° C. for 30 minutes. 1. A glass container comprising:{'sup': '2', 'a glass body having an interior surface and an exterior surface, wherein at least the interior surface of the glass body has a delamination factor of less than or equal to 10 and a threshold diffusivity of greater than about 16 μm/hr at a temperature less than or equal to 450° C.; and'}a heat-tolerant coating bonded to at least a portion of the exterior surface of the glass body, wherein the heat-tolerant coating is thermally stable at a temperature of at least 260° C. for 30 minutes.2. The glass container of claim 1 , wherein the exterior surface of the glass body with the heat-tolerant coating has a coefficient of friction of less than about 0.7.3. The glass container of claim 1 , wherein the heat-tolerant coating has a mass loss of less than about 5% of its mass when heated from a temperature of 150° C. to 350° C. at a ramp rate of about 10° C./minute.4. The glass container of claim 1 , wherein the glass body has an interior region extending between the interior surface of the glass body and the exterior surface of the glass body claim 1 , the interior region having a persistent layer homogeneity.5. The glass container of claim 4 , wherein the interior region has a thickness Tof at least about 100 nm.6. The glass container of claim 4 , wherein the interior region extends from 10 nm below the interior surface of the glass ...

Method of increasing the effectiveness of a fining agent in a glass melt

Feed materials are melted in a furnace to form a glass melt at a first temperature T1, the glass melt containing at least one fining agent. The glass melt is cooled to a second temperature T2 less than T1, and an oxygen-containing gas is bubbled through the cooled melt. The glass melt is then re-heated to a third temperature T3 equal to or greater than the first temperature T1.

Treating an optical fiber preform with carbon monoxide

The invention includes inventive methods of treating a soot preform. One method includes heating a soot preform to a temperature of less than about 1000° C. and exposing the preform to a substantially halide free reducing agent. Preferred reducing agents include carbon monoxide and sulfur dioxide. Another inventive method of treating the preform includes exposing the preform, in a furnace, to a substantially non-chlorine containing atmosphere comprising carbon monoxide. The preform is heated to a temperature of at least about 1000° C. Preferably this method is incorporated into the process for making an optical fiber. An additional method of treating the preform includes doping the preform with fluorine and exposing the fluorine doped preform to a substantially chlorine free atmosphere comprising at least carbon monoxide at a temperature of at least 1100° C., thereby reacting excess oxygen present in the furnace.

Fuel cells with enhanced via fill compositions and/or enhanced via fill geometries

A fuel cell and method for manufacturing the fuel cell are described herein. Basically, the fuel cell is formed from an electrode/electrolyte structure including an array of anode electrodes and cathode electrodes disposed on opposing sides of an electrolyte sheet, the anode and cathode electrodes being electrically connected in series, parallel, or a combination thereof by electrical conductors that traverse via holes in the electrolyte sheet. Several different embodiments of electrical conductors which have a specific composition and/or a specific geometry are described herein.

Synthetic silica material with low fluence-dependent-transmission and method of making the same

Disclosed in the application are a synthetic silica glass having low fluence-dependent transmission, particularly at about 193 nm, and a process for making the same. The glass may desirably exhibit a low level of fluorescence at 290 and 390 nm when activated at about 248 nm. The glass may desirably exhibit low level of LIWFD, [SiH*] and/or [ODC].

Synthetic silica glass optical material and method of producing it

Disclosed is a synthetic silica glass optical material having high resistance to optical damage by ultraviolet radiation in the ultraviolet wavelength range, particularly in the wavelength less than about 250 nm and particularly, exhibiting a low laser induced wavefront distortion; specifically a laser induced wavefront distortion, measured at 633nm, of between about -1.0 and 1.0 nm/cm when subjected to 10 billion pulses of a laser operating at approximately 193 nm and at a fluence of approximately 70µJ/cm2. The synthetic silica glass optical material of the present invention comprises OH concentration levels less than about 600ppm, preferably less than 200ppm, and H2 concentration levels less than about 5.0x1017 molecules/cm3, and preferably less than about 2.0x1017 molecules/cm3 . A method of producing a synthetic silica glass optical material is also claimed.

Process for drying porous glass preforms

The disclosed invention relates to the use of a specific drying agent in a process for drying glass soot preforms. The drying agent includes at least one halide and at least one reducing agent. Preferably, the reducing agent includes a compound that will react with an oxygen by-product of the reaction of the halide and water, or the reaction of the halide and an impurity in the preform. The method includes disposing the soot preform in a furnace, charging the furnace with the drying agent of halide and reducing agent and supplying heat to the furnace. Suitable drying agents for use in the process disclosed include a mixture of Cl2 and CO; a mixture of Cl2, CO and CO2; and POCl3: the latter being an example where the halide and reducing agent are embodied by a single compound.

Treating soot preforms with a reducing agent

A silica soot preform (12) is inserted into a furnace (30). The preform is then treated with heat and carbon monoxide gas (32) so as to reduce impurities that could effect the final product.

Process for drying porous glass preforms

Method of doping a silica glass optical fiber precursor with an alkali metal

A method of making an optical fiber precursor includes generating vapors from an alkali metal source comprising a compound containing both oxygen and one or more alkali metals and applying the vapors to a surface of a glass article comprising silica at a temperature that promotes diffusion of the alkali metal into the surface of the glass article. An optical fiber has a core comprising silica and an alkali metal oxide of the form X2O, where X is selected from the group consisting of K, Na, Li, Cs, and Rb, wherein a concentration of the alkali metal oxide along a length of the core is uniform.

Method of eliminating blisters in a glass making process

A method of controlling blister formation in a glass melt flowing through a system comprising one ore more refractory metal vessels by developing a blister index and determining the critical blister index value. The critical value of the blister index may be used to control the principal variables responsible for blister formation, including the water content of the melt, the concentration of reduced multivalent oxide compounds in the melt, and the hydrogen partial pressure of an atmosphere in contact with the outside surface of the refractory metal vessel. Also disclosed is a minimum partial pressure of hydrogen necessary to produce an essentially blister-free glass article in a glass essentially free of arsenic and antimony.

Method of eliminating blisters in a glass making process

A method of controlling blister formation in a glass melt flowing through a system comprising one ore more refractory metal vessels by developing a blister index and determining the critical blister index value. The critical value of the blister index may be used to control the principal variables responsible for blister formation, including the water content of the melt, the concentration of reduced multivalent oxide compounds in the melt, and the hydrogen partial pressure of an atmosphere in contact with the outside surface of the refractory metal vessel. Also disclosed is a minimum partial pressure of hydrogen necessary to produce an essentially blister-free glass article in a glass essentially free of arsenic and antimony.

Method of eliminating blisters in a glass making process

ガラス作成工程における気泡の除去方法

【課題】耐熱金属製処理システムを含む、かつ砒素またはアンチモンを実質的に含まないガラス製造工程において、気泡を含まないガラス物品を形成する方法を提供する。 【解決手段】単数または複数の耐熱金属製の槽を備えたシステムを通って流れるガラス溶融体中の気泡の形成を、気泡指数を創出しかつ気泡指数の臨界値を決定することによってコントロールする方法である。上記気泡指数の臨界値は、ガラス溶融体中の含水量、ガラス溶融体中の還元された多価の酸化物化合物の濃度、および耐熱金属製の槽の外表面に接触する雰囲気の水素の分圧を含む、気泡の形成の原因となる主要な変数あるいはそれらを組み合わせたものを制御することにより求められる気泡指数を所定の値以下に維持する工程を有する。 【選択図】なし

Method of eliminating blisters in a glass making process

A method of controlling blister formation in a glass melt flowing through a system comprising one ore more refractory metal vessels by developing a blister index and determining the critical blister index value. The critical value of the blister index may be used to control the principal variables responsible for blister formation, including the water content of the melt, the concentration of reduced multivalent oxide compounds in the melt, and the hydrogen partial pressure of an atmosphere in contact with the outside surface of the refractory metal vessel. Also disclosed is a minimum partial pressure of hydrogen necessary to produce an essentially blister-free glass article in a glass essentially free of arsenic and antimony.

Method of doping a silica glass optical fiber precursor with an alkali metal

A method of making an optical fiber precursor includes generating vapors from an alkali metal source comprising a compound containing both oxygen and one or more alkali metals and applying the vapors to a surface of a glass article comprising silica at a temperature that promotes diffusion of the alkali metal into the surface of the glass article. An optical fiber has a core comprising silica and an alkali metal oxide of the form X2O, where X is selected from the group consisting of K, Na, Li, Cs, and Rb, wherein a concentration of the alkali metal oxide along a length of the core is uniform.