Ceramic body comprising silicon carbide and method of forming same
AssigneeSaint-Gobain Ceramics & Plastics, Inc.
InventorsNikolas J. Ninos, Diana R. Tierney
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Abstract
A method of forming a ceramic body including forming a mixture made of at least a first powder material (PM1) including carbon having a first average particle size (PS1), a second powder material (PM2) including carbon and different than the first powder material, the second powder material having a second average particle size (PS2) less than the first average particle size (PS1), and an aluminum content (AC2) greater than the aluminum content (AC1) of the first powder material, and further including forming a green body from the mixture, and sintering the green body and forming a ceramic body having a first type of grain having an average grain size of not greater than about 8 times the first average particle size (PS1).
Claims19
A ceramic component, comprising:
- a silicon carbide body including:
- a first type of grain having a first average grain size, and
- a second type of grain having a second average grain size and an elongated structure,
- wherein:
- the silicon carbide body of the ceramic component includes an aluminum content of not greater than about 800 ppm, and at least about 100 ppm;
- and
- the second average grain size is at least 1.1 times greater than the first average grain size.
A ceramic component, comprising:
- a silicon carbide body including:
- a first type of grain having a first average grain size (GS1), and
- a second type of grain having a second average grain size (GS2) and an elongated structure,
- wherein:
- the second type of grain within the ceramic component includes aluminum, wherein the aluminum is at an aluminum content of not greater than 3000 ppm;
- the silicon carbide body includes an aluminum content of not greater than about 800 ppm and at least about 100 ppm;
- a relative grain size difference between the first type of grain and the second type of grain is based on a following equation
- (
- GS
-
-
- 2
- -
- GS
-
-
- 1
- )
- GS
-
-
- 2
- ×
- 100
-
- %
- ;
- and
- the relative grain size difference is at least 10%.
A ceramic component, comprising:
- a silicon carbide body including:
- a first type of grain having a first average grain size, and
- a second type of grain having a second average grain size and an elongated structure,
- wherein:
- the silicon carbide body of the ceramic component includes an aluminum content in a range of 100 ppm to 800 ppm;
- the second type of grain has an average aspect ratio of at least 2, wherein the aspect ratio is a measure of length to width, and length is longer than the width.
Dependencies are inferred from the claim text.