Ceramic airfoil with cooling air turn

An airfoil comprising:

• a ceramic airfoil defining a leading edge, a trailing edge, a pressure side, a suction side, a first radial end, and a second radial end radially inward from the first radial end, the ceramic airfoil defined between a first platform and a second platform at the first and second radial ends, respectively, the ceramic airfoil having an internal cavity and a rib dividing the internal cavity into a first radial passage and a second radial passage, the first radial passage being open at both the first radial end and the second radial end, and the second radial passage being open at least at the second radial end;
• a flow diverter disposed at the second radial end, the flow diverter being configured to receive cooling air flow from the first radial passage and to divert at least a portion of the cooling air flow into the second radial passage;
• and
• an endplate radially outward from the first platform, the endplate including a nozzle, the nozzle configured to receive the cooling air flow and communicate a source of cooling air flow to the first radial passage.

A method of assembling an airfoil, the method comprising:

• providing a ceramic airfoil that defines a leading edge, a trailing edge, a pressure side, a suction side, a first radial end, and a second radial end radially inward from the first radial end, the ceramic airfoil defined between a first platform and a second platform at the first and second radial ends, respectively, the ceramic airfoil having an internal cavity and a rib that divides the internal cavity into a first radial passage and a second radial passage, the first radial passage is open at both the first radial end and the second radial end, and the second radial passage is open at least at the second radial end;
• attaching a flow diverter at the second radial end, the flow diverter being configured to receive cooling air flow from the first radial passage and to divert at least a portion of the cooling air flow into the second radial passage;
• and
• providing an endplate radially outward from the first platform, the endplate including a nozzle, the nozzle configured to receive the cooling air flow and communicate a source of cooling air flow to the first radial passage.