Rothmans, Benson & Hedges, Inc.

Amr International Corp.

Other

Alcan International Limited

James L Woodhead

Stanislav M Snaidr

Paul Groves

A process for making a catalytic rare earth metal oxide-coated microporous particulate material that has the rare earth metal oxide coated on outer surfaces of the microporous particulate material. The process comprises the steps of: i) combining an amount of a colloidal dispersion of rare earth metal oxide hydrate with a compatible microporous particulate material to form a slurry, the microporous particulate material having an average pore size less than the particle size of the colloidal dispersion, to position thereby, the colloidal dispersion on the outer surfaces of the microporous particulate material; and ii) heat treating the slurry to fix the rare earth metal oxide to the outer surfaces of the microporous particulate material.

Process for making metal oxide-coated microporous materials

A zirconium metal oxide fiber comprises zirconium oxide and a metal oxide. The fiber is made by adding a metal oxide in a suitable form to a colloidal dispersion of an amorphous zirconium polymer. The mixed colloidal dispersion is subsequently made into a fiber. The fiber may be used as a substitute for glass fiber in the manufacture of paper and paper-like materials. The fiber's thickness is substantially uniform and has a length usually in excess of one micron.

Zirconium/metal oxide fibers

The invention concerns sol-gel techniques for making PZT-type ceramics having a perovskite-type structure and ferrite ceramics having a spinel-type structure. Colloidal hydrated oxide sols are mixed with metal salt solutions in the required concentration and the mixed sols dehydrated to form homogeneous gels which are fired at 250.degree. C.-650.degree. C., pressed and sintered at 900.degree.-1300.degree. C. The resulting ceramics include PZT4, PZT5 and lithium ferrites. These have excellent homogeneity, small grain size, high density and improved electrical properties, particularly low dielectric loss, compared with known ceramics of similar composition.

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Banbury, United Kingdom

James L Woodhead