Sintered microcrystalline ceramic material
AssigneeTreibacher Chemische Werke Aktiengesellschaft
InventorsHerwig Winkler, Peter Janz, Georg Gottschamel
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Abstract
Sintered microcrystalline ceramic material based on .alpha.-Al.sub.2 O.sub.3 with an addition of 0.01 to 2.0 weight percent of a cerium compound, consisting of a microcrystalline matrix and 0.1 to 30 volume percent whisker-like needles, whereby said cerium compound is mainly present in the needles. The whisker-like needles give this material a special tenacity combined with good abrasive results.
Claims12
Sintered microcrystalline ceramic material based on .alpha.-Al.sub.2 O.sub.3 with an addition of 0.01 to 2.0 weight percent of a cerium compound, consisting of a microcrystalline matrix and 0.1 to 30 volume percent whisker-like needles,
- said needles having a cerium content of up to 20 weight percent,
- whereby said cerium compound is mainly present in the needles.
Sintered microcrystalline ceramic material based on .alpha.-Al.sub.2 O.sub.3 with an addition of 0.01 to 0.5 weight percent of a cerium compound, consisting of a microcrystalline matrix and 1 to 25 volume percent whisker-like needles,
- said needles having a cerium content of up to 20 weight percent,
- whereby said cerium compound is mainly present in the needles.
Sintered microcrystalline ceramic material based on .alpha.-Al.sub.2 O.sub.3 with an addition of 0.01 to 0.5 weight percent of a cerium compound, consisting of a microcrystalline matrix and 1 to 15 volume percent whisker-like needles,
- said needles having a cerium content of up to 20 weight percent,
- whereby said cerium compound is mainly present in the needles.
Sintered microcrystalline ceramic material based on .alpha.-Al.sub.2 O.sub.3 with an addition of 0.01 to 2.0 weight percent of a compound of an element selected from the group consisting of Ce, La, Nd and Pr consisting of a microcrystalline matrix and 0.1 to 30 volume percent whisker-like needles,
- said needles having an element content of up to 20 weight percent,
- whereby said compound is mainly present in the needles.
Dependencies are inferred from the claim text.