3100F T-EBC Stable Coatings for SiC CMCs

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-SC0018699
Agency Tracking Number: 238109
Amount: $149,980.26
Phase: Phase I
Program: SBIR
Solicitation Topic Code: 18a
Solicitation Number: DE-FOA-0001771
Timeline
Solicitation Year: 2018
Award Year: 2018
Award Start Date (Proposal Award Date): 2018-07-02
Award End Date (Contract End Date): 2019-07-01
Small Business Information
133 Defense Highway,, suite 212, Annapolis, MD, 21401-8970
DUNS: 153908801
HUBZone Owned: N
Woman Owned: Y
Socially and Economically Disadvantaged: N
Principal Investigator
 Larry Fehrenbacher
 (410) 224-3710
 larry@techassess.com
Business Contact
 Sharon Fehrenbacher
Phone: (410) 224-3710
Email: sharon@techassess.com
Research Institution
N/A
Abstract
Developing a T-EBC coating capable of providing extended performance of sic CMCs in high temperature, water vapor gas turbine engine environments at 3100oF coupled with the need to resist degradation from external sand/ salt ingestion is a daunting challenge. Of all the numerous studies by NASA, universities, private sector companies and other Federal laboratories, rare earth zirconia and hafnia compositions appear to offer the best resistance to both the water vapor laded combustion environment of turbine engines and molten sand degradation. TA&T proposes to develop and demonstrate that rare earth multi-layer based EBcs' have the potential to minimize SiOH2 reactions and volatilization with Sic substrate, restrict or delay CMAS interaction with EBC system, including liquid phase infiltration, develop self-healing capability once CMAS reactions occur and enable the bulk of the EBC coating to retain strain tolerance and toughness at 3100oF. Several variants of experimental EBC compositions will be explored using magnetron sputtering to deposit different multilayer compositions on SiC CMCs. Thin alternating multilayers have the advantages of reduced columnar growth, lower residual stress and reduced thermal conductivity compared to single layer coatings. In addition, the interfaces tend to deflect cracks. XRD, SEM and EDS characterization of the compositions, microstructures of the sputtered coatings will be used on iterative basis to arrive at the desired coating deposition parameters and coating properties. The experimental coatings will be subjected to isothermal dry air, flowing air-steam at 50% relative humidity without and with CMAS at 3100oF. Post-test analysis of delamination, cracking, phase changes, chemical interactions will be used to determine and compare the effectiveness of the graded EBC compositions to protect the Sic CMC substrates.

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

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