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US 7,514,383 B2Granted
Materials based on sialon's
AssigneeCeramTec GmbH
InventorsBernd Bitterlich, Kilian Friederich, Ulrich Mowlai
Life of this patent
Estimating the term…
Abstract
A material based on SiAlON contain 70-97 vol. % of alpha and beta-SiAlON and an amorphous or partially crystalline grain boundary phase and 3 to 30 vol.% of a hard material. The material has an alpha-SiAlON gradient which decreases from the outside to the inside.
Claims15
A compact comprising:
- 80 to 95 vol % component A comprising alpha- and beta-SiAlON and a partially crystalline grain-boundary phase;
- and
- 5 to 20 vol.% of component B comprising a hard material which is in globular form and an average grain size of from 1 to 5 microns;
- wherein the compact is sintered and has a sintered surface and a hardness of at least 1550 HV 10 and wherein said compact has an alpha-SiAlON gradient which decreases from the sintered surface to an inside of the sintered compact;
- wherein the sintered surface has an alpha-SiAlON content of up to 100%,
- wherein said hard material is SiC, wherein the state of the hard material remains unchanged after sintering;
- wherein the content of grain-boundary phase is less than 10 vol.% and comprises phases of aluminum containing melilite or disilicate;
- wherein in the inside of the sintered compact comprises from 15 to 50 vol.% alpha-SiAlON and
- wherein the amount of beta-SiAlON ranges from 50 to 85 vol.%.
6 more elements
A compact comprising:
- 80 to 95 vol % component A comprising alpha- and beta-SiAlON and a partially crystalline grain-boundary phase;
- and
- 5 to 20 vol.% of component B comprising a hard material which is in globular form and an average grain size of less than 30 microns;
- wherein the compact is sintered and has a sintered surface and a hardness of at least 1550 HV 10 and wherein said compact has an alpha-SiAlON gradient which decreases from the sintered surface to an inside of the sintered compact;
- wherein the sintered surface has an alpha-SiAlON content of up to 100%,
- wherein said hard material is SiC, wherein the state of the hard material remains unchanged after sintering;
- wherein the content of grain-boundary phase is less than 10 vol.% and comprises phases of aluminium containing melilite or disilicate;
- wherein in the inside of the sintered compact comprises from 15 to 50 vol.% alpha-SiAlON and
- wherein the amount of beta-SiAlON ranges from 50 to 85 vol.%.
6 more elements
Dependencies are inferred from the claim text.