| US 7,501,090 B2 | ||
| Method for protecting metal surfaces utilizing erosion resistant oxide cermets | ||
| Narasimha-Rao Venkata Bangaru, Annandale, N.J. (US); ChangMin Chun, Belle Mead, N.J. (US); Hyun-Woo Jin, Phillipsburg, N.J. (US); Jayoung Koo, Bridgewater, N.J. (US); John Roger Peterson, Ashburn, Va. (US); Robert Lee Antram, Warrenton, Va. (US); and Christopher John Fowler, Springfield, Va. (US) | ||
| Assigned to Exxonmobil Research and Engineering Company, Annandale, N.J. (US) | ||
| Filed on Dec. 20, 2006, as Appl. No. 11/642,407. | ||
| Application 11/642407 is a division of application No. 10/829821, filed on Apr. 22, 2004, granted, now 7,153,338. | ||
| Claims priority of provisional application 60/471792, filed on May 20, 2003. | ||
| Prior Publication US 2008/0245183 A1, Oct. 09, 2008 | ||
| Int. Cl. B22F 7/04 (2006.01); B05D 7/22 (2006.01) | ||
| U.S. Cl. 419—5 [427/230] | 14 Claims |
| 1. A method for protecting a metal surface subject to erosion at temperatures up to 1150° C., the method comprising providing
the metal surface with a cermet composition represented by the formula (PQ)(RS) comprising: a ceramic phase (PQ) and a binder
phase (RS) wherein,
P is a metal selected from the group consisting of Al, Si, Mg, Ca, Y, Fe, Mn, Group IV, Group V, Group VI elements, and mixtures
thereof,
Q is oxide,
R is a base metal selected from the group consisting of Fe, Ni Co, Mn and mixtures thereof,
S consists essentially of at least one element selected from the group consisting of Cr, Al and
Si and at least one reactive wetting element selected from the group consisting of Ti, Zr, Hf, Ta, Sc, Y, La, and Ce, and
wherein the ceramic phase (PQ) ranges from of about 30 to 95 vol % based on the volume of the cermet and is dispersed in the
binder phase (RS) in a closely packed arrangement wherein about 54 vol % of the ceramic phase (PQ) is between about 707 microns
and about 7097 microns in diameter and about 46% of the ceramic phase (PQ) is between about 20 microns and about 707 microns
in diameter.
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