CCS and Power Systems

Advanced Energy Systems - Hydrogen Turbines


High Temperature Unique Low Thermal Conductivity Thermal Barrier Coating (TBC) Architectures


Performer: UES Inc.

Project No: SC0004356


Accomplishments


Phase I

  • Successfully fabricated monolayered and multilayered EBPVD TBCs of selected materials namely GZO and doped YSZ. Monolayered Std. YSZ coating was also fabricated for comparison purposes.
  • Demonstrated crystalline nature with columnar structure and faceted surface morphology of the as-fabricated mono-layered and multilayered TBCs.
  • Demonstrated lower thermal conduc-tivity of the as-fabricated monolayered GZO and doped YSZ TBCs compared to Std. YSZ TBC. It was also demonstrated that the thermal conductivity of GZO can be further lowered by multilayered design. Increase in thermal conductivity after 20 hours of test of the TBCs fabricated from the selected materials
  • was found to be lower compared to the Std. YSZ.
  • Demonstrated that the intrinsically higher erosion rate (lower erosion resistance) of GZO can be lowered considerably by the multilayered coating architecture.

Phase II

  • Microstructural analysis of thermal conductivity samples revealed better high temperature sintering characteristics of selected TBC materials and multilayered coating architectures compared to Std. YSZ.
  • Trend in the erosion rate of the high temperature annealed TBCs was found to be similar to as-deposited TBCs. Even for annealed samples, multilayered TBC architecture was able to considerably reduce the erosion rate of GZO.
  • Further reduction in thermal conductivity of multilayered EBPVD TBC was achieved by microstructural manipulation.
  • Modified multilayered coating design exhibited considerable sintering resistance up to 500 hours at higher temperature (>1300 °C).
  • Composite and monolayered TBCs of selected doped materials were fabricated by cost effective APS technique.
  • Erosion rates of composite APS TBCs scaled with the composition. Composite TBCs exhibited lower erosion rate than the monolayered coating of highly doped APS TBC.
  • Composite TBCs of selected materials were also fabricated by EBPVD technique and are currently being evaluated.

Project Details