Low-Cost, High-Temperature Recuperators for SOFC Fabricated from Ti3AlC2 Machinable Ceramic

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG02-06ER84624
Agency Tracking Number: 80030S06-I
Amount: $99,989.00
Phase: Phase I
Program: SBIR
Awards Year: 2006
Solicitation Year: 2005
Solicitation Topic Code: 15
Solicitation Number: DE-FG01-05ER05-28
Small Business Information
Tiax, LLC
15 Acorn Park, Cambridge, MA, 02140
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Detlef Westphalen
 Dr.
 (617) 498-5821
 westphalen.d@tiaxllc.com
Business Contact
 Renee Wong
Title: Ms.
Phone: (617) 498-5655
Email: wong.renee@tiaxllc.com
Research Institution
N/A
Abstract
Achieving the low-cost and high-efficiency potential of Solid Oxide Fuel Cell (SOFC) systems requires novel approaches to recuperator materials. In these systems, large recuperators are needed to pre-heat the high-flow-rate air to approximately 700% above that dictated by reaction stoichiometry alone. The high-temperature operation requires the use of expensive, heat-resistant metal alloys ¿ which are difficult to machine and cannot be cast into near-net shape, leading to bulky heat exchanger designs. Moreover, recent studies indicate that the metal alloys might reduce the stack power density of the solid oxide fuel cell system. Ceramic materials have been proposed, but their fragility restricts the allowable temperature rise for the air stream. This project will develop and optimize a recuperator based on a new class of machinable, easily-fabricated ceramic materials with good high temperature properties. Titanium silicon carbide and titanium aluminum carbide are examples of this material class that are particularly well suited for the recuperator application. In Phase I, the feasibility of high temperature recuperators, made with the titanium aluminum carbide material, will be demonstrated for SOFC systems. Materials testing will be performed to evaluate high temperature strength, resistance to thermal gradients, and thermal shock and material compatibility. The feasibility of manufacturing and assembling compact heat exchanger configurations with titanium aluminum carbide will be evaluated by a combination of analysis and small scale experiments. Commercial Applications and Other Benefits as described by the awardee: In addition to the application to Solid Oxide Fuel Cells systems, the recuperator should find use in other high temperature applications, e.g., microturbines

* information listed above is at the time of submission.

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