Strain tolerant aggregate material
AssigneeSiemens Power Generation, Inc.
InventorChristian X. Campbell
Life of this patent
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Abstract
A material (100) formed of a sintered aggregation of ceria particles (106), mullite particles (108) and an alumina matrix material (110). Differential thermal expansion of the ceria and mullite particles generates thermal stress sufficient to create micro-cracking of the ceria particles. The ratio of ceria to mullite may be selected to achieve a desired coefficient of thermal expansion for matching the thermal growth of a mating CMC material (102). The micro cracks provide the material with a desired degree of strain tolerance useful in high temperature applications such as a solid core gas turbine vane (20).
Claims29
A material comprising:
- an aggregation of first particles comprising a network of microcracks and second particles within a binding matrix comprising a ceramic material;
- wherein the first particles and the second particles are selected to have sufficiently different coefficients of thermal expansion so that thermal stresses generated there between during heating of the material result in micro cracking within at least the first particles, wherein the first particles comprise ceria and the second particles comprise mullite.
A composite material comprising:
- a ceramic matrix composite material;
- an aggregate material comprising first particles comprising a network of microcracks and second particles within a binding matrix comprising a ceramic material bonded to a first surface of the ceramic matrix composite material;
- wherein the first particles and the second particles are selected to have sufficiently different coefficients of thermal expansion so that thermal stresses generated there between during heating of the aggregate material result in a degree of micro cracking within at least one of the group consisting of the first particles and the second particles sufficient to achieve a desired degree of strain tolerance in the aggregate material, wherein the first particles comprise and the second particles comprise mullite.
A material comprising a sintered aggregation of ceria particles and mullite particles within a binding matrix comprising a ceramic material, wherein the ceria particles comprise a network of microcracks.
Dependencies are inferred from the claim text.