Patents by Inventor Paz C. Martinez

Paz C. Martinez has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for the production of beta-sialon based ceramic powders
    Patent number: 5110773
    Abstract: A method to obtain .beta.'-sialon-based ceramic powders through carbo-thermal reduction in a nitrogen atmosphere at 1300.degree.-1500.degree. C. of pre-mullitic material with high specific surface and reactivity, the material having a crystalline phase with a formula of 3Al.sub.2 O.sub.3 2SiO.sub.2 and a proportion of displaced amorphous silica. The overall proportion Al.sub.2 O.sub.3 /SiO.sub.2 range from 0.5 to 1.5 giving specific surfaces that are always higher than 50 m.sup.2 /g.This product obtained has a major phase of .beta.'-sialon with a formula of Si.sub.6-z Al.sub.z N.sub.8-z O.sub.z (where z=2.7-4.0) and small proportions or traces of other phases such as .alpha.-Al.sub.2 O.sub.3, .beta.-N.sub.4 Si.sub.3 and polytypes.
    Type: Grant
    Filed: November 22, 1989
    Date of Patent: May 5, 1992
    Assignee: Union Explosivos Rio Tinto, S.A.
    Inventors: Jose S. M. Corral, Salvador De Aza, Francisco M. Poyato, Francisco J. Valle Fuentes, Isabel O. Miranda, Rafael M. Caseres, Paz C. Martinez