Functionally Graded Coatings for Enhanced Corrosion Resistant Steel Tubing for Ultrasupercritical Boilers

Award Information
Agency: Department of Energy
Branch: N/A
Contract: DE-FG02-08ER84953
Agency Tracking Number: 85498
Amount: $100,000.00
Phase: Phase I
Program: SBIR
Awards Year: 2008
Solicitation Year: 2008
Solicitation Topic Code: 58 a
Solicitation Number: DE-PS02-07ER07-36
Small Business Information
7960 S. Kolb Road, Tucson, AZ, 85756
DUNS: 147518286
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Roger Storm
 (520) 574-1980
Business Contact
 Raouf Loutfy
Title: Dr.
Phone: (520) 574-1980
Research Institution
DOE has a need for cost effective materials that can meet the high temperature creep and oxidation/corrosion requirements for the operation of ultrasupercritical boilers at high operating temperatures. To meet these requirements, this project will develop a new process to produce novel composite coatings on metal shapes. For the case of steel tubes for an ultrasupercritical boiler, a plasma transferred arc (PTA) torch will be used to melt a small pool in the surface of the steel tube, and chrome powder will be added to the melt pool. A localized N2 atmosphere results in the instantaneous formation of a Cr-Fe-N composite in a solid solution of Cr-Fe. The concentration of the nitride phase will be functionally graded, from very high at the surface to zero in the original substrate, which results in exceptionally strong bonding between the coating and the substrate. The concentration of the nitride phase can be controlled by the process conditions. For example, as nitride content increases, hardness increases, and corrosion resistance is enhanced. In Phase I, the process conditions, coating composition, microstructure, and thickness will be optimized for scale-up in Phase II, where components will be tested in an operating boiler. Commercial Applications and other Benefits as described by the awardee: In addition to the tubing in ultrasupercritical boilers, the new coating technology should find application in other heat exchangers where corrosion resistance is an issue. The high hardness and erosion resistance of the coatings also should find use in applications requiring erosion resistance, such as turbine engines.

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

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