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Improved Attachment Design for Ceramic Turbine Blades Via Hybrid Concepts

Award Information
Agency: National Aeronautics and Space Administration
Branch: N/A
Contract: NNX14CC35P
Agency Tracking Number: 144228
Amount: $122,635.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: A3.07
Solicitation Number: N/A
Timeline
Solicitation Year: 2014
Award Year: 2014
Award Start Date (Proposal Award Date): 2014-06-20
Award End Date (Contract End Date): 2014-12-19
Small Business Information
6659 Pearl Road, #201
Parma Heights, OH 44130-3821
United States
DUNS: 123834959
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: Yes
Principal Investigator
 John Gayda
 Technical Specialist
 (440) 845-7020
 johngaydajr@yahoo.com
Business Contact
 Vinod Nagpal
Title: Business Official
Phone: (440) 845-7020
Email: vnagpal@nrengineering.com
Research Institution
N/A
Abstract

This proposal presents a hybrid metal-CMC turbine blade. A SiC/SiC CMC airfoil section will be bonded to a single crystal superalloy root section in order to mitigate risks associated with an all-CMC blade inserted in a superalloy disk. This allows current blade attachment technology (SX blade with a dovetail attachment to a slotted Ni disk) to be used with a ceramic airfoil. The bond between the CMC and single crystal will be primarily mechanical in nature, and enhanced with clamping arising from thermal expansion mismatch. Two single crystal root sections will be bonded to each other using diffusion bonding and/or transient liquid phase bonding at temperatures near 2200 0F. The single crystals will form a clam shell around the CMC, with little or no gap between the metal and ceramic. Upon cooling, the metal will shrink around the CMC spar to firmly clamp it. Single crystals will resist stress relaxation at an operating temperature of 1500 0F, thus maintaining clamping loads for long lives. The use of an inter layer ("compliant layer") between the CMC and the single crystal may also be entertained. 1500 0F is a reasonable upper limit for chemical reactivity issues between the metal and ceramic.

* Information listed above is at the time of submission. *

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