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US 7,666,344 B2Granted
Thermal shock resistant ceramic composites
AssigneeStanton Advanced Ceramics, Inc.
InventorsKarl-Heinz Schofalvi, Gerald C. Dodds
Life of this patent
Estimating the term…
Abstract
The disclosed invention relates to ceramic matrix composites with ceramic fiber reinforcements.
Claims17
A process for making a ceramic composite, comprising:
- (A) wetting a preform comprising reinforcement fibers with a sol to form a wetted preform, the reinforcement fibers comprising alumina, zirconia or magnesium silicate, the sol comprising alumina or zirconia and a rare earth oxide in a mixture of water and mineral acid, heating the wetted preform to a first temperature and digesting part of the reinforcement fibers in the sol;
- and
- (B) heating the preform from step (A) to a second temperature to react the alumina or zirconia and the rare earth oxide from the sol with the reinforced fibers, the second temperature being higher than the first temperature and sufficient to permit the formation of microcracking in the reinforcement fibers.
A process for making a ceramic composite comprising:
- (A) wetting a preform comprising reinforcement fibers with a sol to form a wetted preform, the reinforcement fibers comprising alumina, the sol comprising alumina and a rare earth oxide in a mixture of water and a mineral acid and being essentially free of silicates, heating the wetted preform to a first temperature, and digesting part of the reinforcement fibers in the sol;
- and
- (B) heating the preform from step (A) to a second temperature to react the alumina and the rare earth oxide with the reinforcement fibers, the second temperature being higher than the first temperature and sufficient to permit the formation of microcracking in the reinforcement fibers.
A process for making a ceramic composite, comprising:
- (A) wetting a preform comprising reinforcement fibers with a sol to form a wetted preform, the reinforcement fibers comprising alumina, zirconia or magnesium silicate, the sol comprising alumina or zirconia and optionally a rare earth oxide, heating the wetted preform to a first temperature and digesting part of the reinforcement fibers in the sol;
- and
- (B) heating the preform from step (A) to a second temperature to react the alumina or zirconia and optionally the rare earth oxide from the sol with the reinforced fibers, the second temperature being higher than the first temperature and sufficient to permit the formation of microcracking in the reinforcement fibers;
- wherein the sol is an alumina sol or a zirconia sol and further comprises yttrium aluminum garnet and hafnium nitride.
1 more element
A process for making a ceramic composite, comprising:
- (A) wetting a preform comprising reinforcement fibers with a sol to form a wetted preform, the reinforcement fibers comprising alumina, zirconia or magnesium silicate, the sol comprising alumina or zirconia and optionally a rare earth oxide, heating the wetted preform to a first temperature and digesting part of the reinforcement fibers in the sol;
- and
- (B) heating the preform from step (A) to a second temperature to react the alumina or zirconia and optionally the rare earth oxide from the sol with the reinforced fibers, the second temperature being higher than the first temperature and sufficient to permit the formation of microcracking in the reinforcement fibers;
- wherein the reinforcement fibers comprise alumina, and the sol comprises zirconia sol, Atrium aluminum garnet and hafnium nitride powder.
1 more element
A process for making a ceramic composite, comprising:
- (A) wetting a preform comprising reinforcement fibers with a sol to form a wetted preform, the reinforcement fibers comprising alumina, zirconia or magnesium silicate, the sol comprising alumina or zirconia and optionally a rare earth oxide, heating the wetted preform to a first temperature and digesting part of the reinforcement fibers in the sol;
- and
- (B) heating the preform from step (A) to a second temperature to react the alumina or zirconia and optionally the rare earth oxide from the sol with the reinforced fibers, the second temperature being higher than the first temperature and sufficient to permit the formation of microcracking in the reinforcement fibers;
- wherein the reinforcement fibers comprise zirconia, and the sol comprises zirconia sol, Atrium aluminum garnet and hafnium nitride powder.
1 more element
Dependencies are inferred from the claim text.