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.