A cyclic furnace study was conducted on thermal barrier systems to evaluate the effects of yttrium, chromium, and aluminum in nickel-base alloy bond coatings and the effect of bond coating thickness on yttria-stabilized zirconia thermal barrier coating life. Without yttrium in the bond coatings, the zirconia coatings failed very rapidly. Increasing chromium and aluminum in the Ni-Cr-Al-Y bond coatings increased total coating life. This effect was not as great as that due to yttrium. Increased bond coat thickness was also found to increase life.
NASA Technical Reports Server (NTRS) Collection.
Document ID: 19800013977. Accession ID: 80N22464. NASA-TM-81485. E-423. Intern. Conf. on Metallurgical Coatings; 21-25 Apr. 1980; San Diego, CA; United States.