Stacked laminate CMC turbine vane
First Claim
1. A ceramic matrix composite laminate comprising:
- a laminate having an airfoil-shaped outer peripheral surface, the laminate having an in-plane direction and a through thickness direction, the through thickness direction being substantially normal to the in-plane direction, the laminate being made of an anisotropic ceramic matrix composite (CMC) material, wherein the in-plane tensile strength of the laminate is substantially greater than the through thickness tensile strength of the laminate.
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Accused Products
Abstract
Embodiments of the invention relate to a robust turbine vane made of stacked airfoil-shaped CMC laminates. Each laminate has an in-plane direction and a through thickness direction substantially normal to the in-plane direction. The laminates have anisotropic strength characteristics in which the in-plane tensile strength is substantially greater than the through thickness tensile strength. Thus, the laminates can provide strength in the direction of high thermal gradients and, thus, withstand the associated high thermal stresses. The laminates are relatively weak in through thickness (interlaminar) tension, but, in operation, relatively low through thickness tensile stresses can be expected. The laminates can be strong in through thickness compression; accordingly, the laminate stack can be held in through thickness compression by one or more fasteners. The CMC material can permit the inclusion of additional features such as cooling passages, ribs, spars, and thermal coatings, without compromising the strength characteristics of the material.
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Citations
20 Claims
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1. A ceramic matrix composite laminate comprising:
a laminate having an airfoil-shaped outer peripheral surface, the laminate having an in-plane direction and a through thickness direction, the through thickness direction being substantially normal to the in-plane direction, the laminate being made of an anisotropic ceramic matrix composite (CMC) material, wherein the in-plane tensile strength of the laminate is substantially greater than the through thickness tensile strength of the laminate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A turbine vane assembly comprising:
a plurality of airfoil-shaped laminates radially stacked so as to define a turbine vane, the vane having an outer peripheral surface and a planar direction and a radial direction, the radial direction being substantially normal to the planar direction, wherein each laminate is made of an anisotropic ceramic matrix composite (CMC) material such that the planar tensile strength of the vane is substantially greater than the radial tensile strength of the vane. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification