Compositions: ceramic – Ceramic compositions – Refractory
Patent
1989-11-22
1992-05-05
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
501 97, 423327, C04B 3558
Patent
active
051107732
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.
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Caseres Rafael M.
Corral Jose S. M.
de Aza Salvador
Martinez Paz C.
Miranda Isabel O.
Group Karl
Union Explosivos Rio Tinto, S.A.
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