Compositions: ceramic – Ceramic compositions – Refractory
Reexamination Certificate
2007-11-13
2007-11-13
Group, Karl (Department: 1755)
Compositions: ceramic
Ceramic compositions
Refractory
C501S098200, C501S098300, C501S087000, C501S092000, C501S097100, C501S097200, C501S097300
Reexamination Certificate
active
11078615
ABSTRACT:
A sintered ceramic material comprises a crystalline phase and an intergranular phase comprising a glass phase. The material is manufactured from a starting powder being mixed with an additive comprising one or more metal from a group of Li, Na, Mg, Ca, Sr, Ba, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Th, Pa or U. The additive is in non oxide form, or in a form which transforms to a metal or nitride during a synthesis in nitrogen atmosphere and the resulting glass phase having a high nitrogen content with a N:O ratio higher than 35:65 and a glass transition temperature above 950° C.
REFERENCES:
patent: 5316856 (1994-05-01), Suzuki et al.
patent: 5316988 (1994-05-01), O'Brien et al.
patent: 2004/0067838 (2004-04-01), Mandal et al.
patent: 2005/0020432 (2005-01-01), Donald et al.
patent: 10029869 (1998-02-01), None
patent: 11-343173 (1999-12-01), None
patent: 2001019550 (2001-01-01), None
“Thermal Stability of Calcium a-slalon Ceramics” Hewett et al.,Journal of the European Ceramic Society18, 1998 pp. 417-427.
Connolly Bove Lodge and Hutz
Diamorph Ceramic AB
Group Karl
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