Patent ID: 11970953
Assignee: RTX CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC C  F | IPC C  F

Claim 3:
4. A rotor blade for a gas turbine engine, comprising:
an airfoil;
a root;
a platform that comprises a gas path side adjacent to the airfoil and a non-gas path side adjacent to the root; and
a diffusion coating on the non-gas path side of the platform, the diffusion coating comprising a Cr-enriched γ-Ni based layer with a Cr content of 20 wt. % minimum and Al content of 4 wt. % minimum having an inter-diffusion zone at an interface between the diffusion coating and the platform, the diffusion coating further comprising a non-metallic inclusions zone adjacent to an outer surface of the diffusion coating, wherein the interdiffusion zone comprises elongated refractory element-rich particles, wherein the Cr content and the Al content are distributed through the diffusion coating such that a single diffusion coating layer contains the Cr content and the Al content, wherein the platform and the root define at least one pocket on the non-gas path side of the platform, and cooling holes, and wherein the diffusion coating is applied over the at least one pocket.