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US 12,054,427 B2Granted
Environmental barrier coating
AssigneeRtx Corporation
InventorsRichard Wesley Jackson, James T. Beals, Xia Tang, David A. Litton, Elisa M. Zaleski, Brian T. Hazel
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Abstract
An environmental barrier coating includes a barrier layer which includes a matrix, diffusive particles, and gettering particles; and a calcium-magnesia alumina-silicate (CMAS)-resistant component. The CMAS-resistant component includes hafnium silicate and a rare earth hafnate. An article and a method of fabricating an article are also disclosed.
Claims12
An environmental barrier coating, comprising:
- a barrier layer, the barrier layer including a matrix, diffusive particles, and gettering particles;
- and
- a calcium-magnesia alumina-silicate (CMAS)-resistant component, wherein the CMAS-resistant component includes between about 25 and about 45 single cation mole percent hafnium silicate, between about 55 and about 75 single cation mole percent rare-earth hafnate, and up to about 5 single cation mole percent hafnium oxide, wherein the rare earth hafnate is La-hafnate, Nd-hafnate or Pr-hafnate.
An article, comprising:
- a substrate;
- and
- a coating disposed on the substrate, the coating including
- a barrier layer, the barrier layer including a matrix, diffusive particles, and gettering particles, and
- a CMAS-resistant component, the CMAS-resistant component including between about 25 and about 45 single cation mole percent hafnium silicate, between about 55 and about 75 single cation mole percent rare-earth hafnate, and up to about 5 single cation mole percent hafnium oxide, wherein the rare earth hafnate is La-hafnate, Nd-hafnate or Pr-hafnate.
2 more elements
A method of fabricating an article, comprising:
- applying a barrier layer on a substrate, the barrier layer including a matrix, diffusive particles, gettering particles, and a CMAS-resistant component, the CMAS-resistant component the CMAS-resistant component including between about 25 and about 45 single cation mole percent hafnium silicate, between about 55 and about 75 single cation mole percent rare-earth hafnate, and up to about 5 single cation mole percent hafnium oxide, wherein the rare earth hafnate is La-hafnate, Nd-hafnate or Pr-hafnate.
Dependencies are inferred from the claim text.