Fig 15 Thermal Conductivity Of The Cerac And Zircoa Material As A Function Of Porosity

difficult time correlating the various methods of measuring porosity.

After optimizing the plasma spray parameters for the particular powders, 4-point bend specimens were produced with various thickness coatings to enable us to determine both the compressive and tensile strength of the coatings based upon the processing and resulting porosity levels. Figure 16 shows the 4-point bend fixture which has silicon carbide load rollers for high temperature testing. A composite specimen consisting of the substrate, bond coating, and ceramic was tested to obtain the compressive strength of the coating. Free standing specimens of ceramic were produced by spraying onto

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