Abstract
Abstract To accelerate development and demonstration of hydrogen as fuel for gas turbines, durability testing of conventional and advanced thermal barrier coatings (TBC) applied on hot section gas turbine components. Note: Hydrogen creates a harsher environment for the TBC (erosion, delamination, heat transfer or other). Eight (8) coating and repair facilities provided twelve (12) different conventional (6%–8% yttria stabilized) and advanced (rare earth element stabilized) TBC applications. Three (3) Frame 7F .03 Stage 1 Buckets (S1B) for each application were coated together with samples and tabs. After the first article inspection (FAI) review, the S1B were inspected and verified quality recorded. The S1B were installed in the Dominion Chesterfield Frame 7F .03 which utilizes a MNQC (steam injection) combustion system with operation beginning in November of 2022. [Reference [4] These buckets are planned to be removed in 2026 with semiannual borescope inspections being performed until that time. This paper describes the inspections performed on the S1B prior to installation and the phase change and thermal conductivity test performed before and after thermal exposure of these twelve (12) coatings systems test coupons. The objective of this program is to test the durability of conventional and advanced TBC on Frame 7F .03 Stage 1 Buckets (S1B) under severe circumstances (Steam injected and high heat transfer) comparable to low carbon operational conditions (hydrogen fuel) and determine which coating system can best withstand this environment while also reducing base material temperature during operation.
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