Raychem Limited

Amy S Chu

Ryan W Dupon

Karin M Kinsman

Linas Mazeika

Martha L McCrum

Pawel Czubarow

Anthony C Evans

Christian Weber

A method of forming an article having a cermet layer on a porcelain substrate, via the steps of (a) providing a substrate made a porcelain comprising one or more crystalline oxide phases dispersed in a glassy matrix, the glassy matrix containing 0.25 to 45.0 weight % of a reducible metal oxide having a reduction potential of between -1.0 and +3.5 E.degree./V; and (b) heating the substrate in a reducing atmosphere to form on at least one surface of the substrate a layer of cermet comprising elemental metal which is a reduction product of the reducible metal oxide. The article may be used as a substrate for magnetic recording disks.

Magnetic disk comprising a substrate with a cermet layer on a porcelain

A method for making a high strength porcelain for use as an insulator or a structural ceramic, comprising: A) forming a mixture comprising alumina, clay and a fluxing material; B) forming the mixture into a shaped article; and C) firing the shaped article.

High strength porcelain and method therefor

A porcelain having 9 to 55% by weight of SiO.sub.2, 36 to 87% by weight of Al.sub.2 O.sub.3, 0 to 2.0% by weight of Fe.sub.2 O.sub.3, 0 to 1.0% by weight of TiO.sub.2, 0 to 0.5% by weight of CaO, 0 to 0.5% by weight of MgO, 1.0 to 4.0% by weight of K.sub.2 O and Na.sub.2 O combined, and 0.25 to 25.0% by weight of bismuth oxide is disclosed. The porcelain has unexpectedly high unglazed bending strength and may be used for dielectric and structural applications.

Growing community of inventors

Oakland, CA, United States of America

Amy S Chu