Short Summary
An Innovative
Approach to Stabilize the Thermal Conductivity of Air Plasma-Sprayed Thermal
Barrier Coatings
Rodney W. Trice
00-22
EISG Project Title: An Innovative Approach to Stabilize the Thermal Conductivity of Air Plasma-Sprayed Thermal Barrier Coatings
EISG Grant Number: 00-22
PIER Area: Environmentally Preferred Advanced Generation
Principal Investigator: Rodney Trice
Contact Information: (765) 494-6405 rtrice@ecn.purdue.edu
Organization: Purdue University
Grant Amount: $75,000
Grant Term: 18 months
Project Description:
The purpose of this project is to research the feasibility of increasing overall efficiency of land-based turbines via an innovative materials solution employing micro-structurally designed thermal barrier coatings. An air plasma sprayed method will be used to complete this work.
Proposed Outcomes:
· Produce a thermal barrier coating capable of maintaining a thermal conductivity of 1.2 W/m
K over 500 hrs at 14000C
· Produce colloidal suspensions of 1 mm diameter stabilized zirconia and dopants that can be
plasma sprayed without agglomeration
· Optimize the plasma-spray parameters for each stabilized zirconia/dopant to satisfy the following criteria: (a) a high degree of atomic mixing occurs, (b) 1 mm deposition rates are observed, and (c) coatings contain less than 15% porosity
· Reduce the amount of sintering that occurs in the coatings by reducing grain growth by 100%
Anticipated Benefits:
· Increase of combustion temperature by 50°C
· An increase in efficiency of 3-4%
· Increased reliability of the coating