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US 12,753,468 B2Granted
Coating composition comprising chromium and aluminum and coatings formed using the same
AssigneeOerlikon Metco (US) Inc.
InventorsJames Nathaniel Vecchio, Justin Lee Cheney, Naixie Zhou
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Abstract
This disclosure generally relates to coating compositions comprising chromium and aluminum and coatings formed using the same, and more particularly to bond coat compositions and coatings for use in various gas turbine applications. In one aspect, a material composition comprises M, Cr, and Al, wherein M is one or more of Ni, Co, and Fe. The material composition is configured to form a BCC ordered phase and a disordered metallic phase of either a BCC or FCC crystal structure.
Claims20
A feedstock material, comprising:
- a composition that comprises, in weight percent (wt. %):
- nickel:
- 18-31;
- cobalt:
- 18-31;
- iron:
- 18-31;
- chromium:
- 16-27;
- and
- aluminum:
- 2-13;
- and
- a microstructure that comprises a B2 ordered phase and a disordered metallic phase,
- wherein the disordered metallic phase comprises a BCC crystal structure or an FCC crystal structure,
- wherein, under equilibrium conditions, a formation temperature of the B2 ordered phase is greater than a formation temperature of the disordered metallic phase by between 0 K and 150 K, and
- wherein at least 85% of grains in the microstructure have a size of 100 nm or smaller.
14 more elements
A coating comprising:
- a composition that comprises, in weight percent (wt. %):
- nickel:
- 18-31;
- cobalt:
- 18-31;
- iron:
- 18-31;
- chromium:
- 16-27;
- and
- aluminum:
- 2-13;
- and
- a microstructure that comprises a B2 ordered phase and a disordered metallic phase, wherein:
- the disordered metallic phase comprises a BCC crystal structure or an FCC crystal structure,
- under equilibrium conditions, a formation temperature of the B2 ordered phase is greater than a formation temperature of the disordered metallic phase by less than 150 K, and
- at least 85% of grains in the microstructure have a size of 100 nm or smaller when the coating is formed by cooling from a liquid state at a rate between 5° C./sec and 20° C./sec.
14 more elements
A bond coat material comprising:
- M, Cr, and Al, wherein M is one or more of Ni, Co, and Fe;
- and
- a microstructure that comprises a B2 ordered phase and a disordered metallic phase,
- wherein the disordered metallic phase comprises a BCC or FCC crystal structure,
- wherein, under equilibrium conditions, a formation temperature of the B2 ordered phase is greater than a formation temperature of the disordered metallic phase by between 0 K and 150 K, and
- wherein at least 85% of grains in the microstructure are 100 nm in size or smaller when solidified from a liquid state at a rate between 5° C./second and 20° C./second.
3 more elements
Dependencies are inferred from the claim text.