Wetting resistant materials and articles made therewith
AssigneeGeneral Electric Company
InventorsMolly Maureen Gentleman, James Anthony Ruud, Margaret Louise Blohm, Mohan Manoharan
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Abstract
Ceramic materials with relatively high resistance to wetting by various liquids, such as water, are presented, along with articles made with these materials. The oxide materials described herein as a class typically contain one or more of ytterbia (Yb2O3) and europia (Eu2O3). The oxides may further contain other additives, such as oxides of gadolinium (Gd), samarium (Sm), dysprosium (Dy), or terbium (Tb). In certain embodiments the oxide, in addition to the ytterbia and/or europia, further comprises lanthanum (La), praseodymium (Pr), or neodymium (Nd).
Claims22
An article comprising:
- a coating disposed on a metal substrate, wherein the coating comprises an oxide, the oxide having up to about 25 atomic percent of its total cation content as tetravalent cations, with the oxide having a composition defined by the chemical formula (AxB1-x)2O3;
- wherein A comprises Yb or Eu, and B comprises Gd, Sm, Dy, or Tb;
- and
- wherein x is in the range from about 0.01 to about 0.99;
- subject to the following:
- (a) provided that, where A consists essentially of Yb, B consists essentially of Gd;
- and
- (b) provided that, where A consists essentially of Eu and B comprises Sm, Dy, or Tb, x is in the range from about 0.5 to about 0.99.
An article comprising:
- a coating disposed on a substrate, wherein the coating comprises an oxide, the oxide having up to about 25 atomic percent of its total cation content as tetravalent cations, with the oxide having a composition defined by the chemical formula (AxB1-x)2O3;
- wherein A comprises Yb and Eu, and B comprises Gd, Sm, Dy, or Tb;
- and
- wherein x is in the range from about 0.01 to about 0.99.
Dependencies are inferred from the claim text.