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The high temperature strength and deformation behavior of ceramic and two different metal substrates were measured in the 25°-1200°C temperature range in uniaxial and biaxial bending using rectangular bars and circular discs, respectively, prepared from the substrates. The data show that both of the metal substrates exhibit permanent deformation and lose their load carrying capability by an order of magnitude above 800°C. The ceramic substrate, on the other hand, preserves its strength and behaves elastically over the entire temperature range exhibiting neither permanent deformation nor cell distortion. These data suggest that the upper use temperature for metal substrates could be significantly lower than that for ceramic substrates to meet 50-100K vehicle mile durability

Testing was performed on Corning's Generation 3 Electrically Heated Catalyst (EHC) to determine product reliability and durability. A number of functional measurements was performed before and after all electrical, thermal/mechanical and environmental tests. EHCs were also successfully tested on vehicles for 100,000 miles. The results of all tests were favorable and indicated that the new design meets or exceeds requirements.