Heraeus Quartz America LLC

Other

Heraeus Quarzglas Gmbh & Co Kg

Matthew J Donelon

Gerrit Scheich

Ashur J Atanos

Nadine Tscholitsch

Mary R Reidmeyer

Frank Nuernberg

Andreas Goetzendorfer

Bernhard Franz

Ursula Klett

Arturo Sanchez

Kwang Chul Kim

Arno Pitzen

A diffuser material of synthetically produced, pore-containing quartz glass and a method for the manufacture of a molded body consisting fully or in part thereof. The diffuser material has a chemical purity of at least 99.9% SiO, a cristobalite content of not more than 1%, and a density in the range of 2.0 to 2.18 g/cm. Starting therefrom, to indicate a diffuser material which is improved with respect to diffuse reflectivity with Lambertian behavior over a wide wavelength range, high material homogeneity and UV radiation resistance, the quartz glass has a hydroxyl group content in the range of at least 200 wt. ppm and at least 80% of the pores have a maximum pore dimension of less than 20 &#x3bc;m.

Diffuser material of synthetically produced quartz glass and method for the manufacture of a molded body consisting fully or in part thereof

Processes for fusing opaque fused quartz to clear fused quartz to form ultraviolet light transmission windows comprise surrounding a clear fused quartz ingot with an opaque fused quartz sleeve or opaque fused quartz particles, then heating the clear and opaque fused quartz together in a furnace, past the transition temperature of the opaque fused quartz, in order to join the two types of quartz together around the perimeter of the clear fused quartz ingot, but without substantial mixing beyond the interface.

Process for joining opaque fused quartz to clear fused quartz

A method of forming an opaque quartz glass component is provided. The method includes (a) providing a starting preform made of quartz glass; (b) heating at least a portion of the starting preform to a predetermined temperature at which the quartz glass of the starting preform has a viscosity in a range of 10E2 to 10E12 poise; and (c) deforming at least a portion of the heated preform at the predetermined temperature to change a shape and/or dimension(s) of the heated perform in order to form the opaque quartz glass component. The starting preform and the heated preform have respective densities of at least 2.15 g/cmand at least 2.10 g/cm. The starting perform and the opaque quartz glass component have respective direct spectral transmissions of approximately 0.1-1% and 0.2-3% in the wavelength range of &#x3bb;=190 nm to &#x3bb;=4990 nm at a wall thickness of 3 mm and a diffuse reflectance of at least 60% in a wavelength range of &#x3bb;=190 nm to &#x3bb;=2500 nm.

Method for forming opaque quartz glass components

A method of forming fused quartz glass is provided. The method includes the steps of: (a) providing a starting body made of fused quartz glass; (b) positioning the fused quartz glass starting body on a base plate; (c) inserting a first insert device into an interior cavity of the starting body to form an assembled structure; (d) heating the assembled structure to a predetermined temperature at which the fused quartz glass has a viscosity in a range of 10to 10poise; and (e) deforming the fused quartz glass of the starting body at the predetermined temperature or in the viscosity range of 10to 10poise around the first insert device to change a shape of the starting body. A method for making a large fused quartz glass vessel and a forming assembly for forming fused quartz glass are also provided.

System and method for forming fused quartz glass

An automotive lambda oxygen sensor is formed by electroless plating of a thin, catalytically active, conductive electrode uniformly on the outer surface of a zirconia thimble. The process includes forming a pristine zirconia solid electrolyte thimble and drilling out a cylindrical cavity in it. A porous outer surface suitable for producing crystallization sites is formed by dipping the unfired thimble in a zirconia slurry containing spray-dried microspheres and firing the coated thimble to densify the thimble and the microspheres and to produce cavities on the surface of the thimble. An inner platinum electrode is formed by conventional conductive ink painting on the axial cavity of the sensor, and the sensor is again fired. The surface is activated by immersion in an acetone chloroplatinic acid bath to form multiple crystallization points, heat treated, then plated in an electroless platinum bath to a desired thickness. After plating, the sensor is heat treated and a conventional spinel glaze coat is flame sprayed over the sensor. The process produces sensors which consistently provide rapid response times and stable operation.

Chemical plating method, electrolytic cell and automotive oxygen sensor using it

Growing community of inventors

Austin, TX, United States of America

Matthew J Donelon