Corrosion Behavior of Titanate Ceramics in Short-Term MCC-1 Tests: The Effects of Surface Finish

Bakel, A.J. ; Basco, J.K. ; Nole, M.K. ; Chamberlain, D.B.

Lawrence Livermore National Laboratory

关键词: Corrosion;    Rutile;    Perovskite;    99 General And Miscellaneous//Mathematics, Computing, And Information Science;    36 Materials Science;   

DOI  :  10.2172/793683
RP-ID  :  UCRL-ID-139845
RP-ID  :  W-7405-Eng-48
RP-ID  :  793683

美国|英语

来源: UNT Digital Library

【 摘 要 】

Two series of MCC-1 tests were designed and conducted to describe the effects of surface finish on the corrosion behavior of titanate ceramics. These effects are important for the comparison of short-term test results from different laboratories. Test samples were prepared with 240- and 600-grit finishes. Tests, conducted for 1, 3, 7, and 14 days at 90 C, were carried out in Teflon{reg_sign} vessels. Two different ceramics were used in this study: a Hf-Ce-Ce ceramic containing pyrochlore, perovskite, rutile and a small amount of a silicate phase, and a Hf-Ce-U ceramic containing pyrochlore and rutile. This study shows no detectable difference in the results of tests with ceramics finished to 240-grit and 600-grit; therefore, tests conducted at these two surface finishes can be directly compared. Due to its broader use, we recommend that short-term tests be conducted with monoliths finished to 600-grit. Comparison of data from blank tests in Teflon{reg_sign} and stainless steel vessels shows that the background associated with Teflon{reg_sign} vessels is lower. Therefore, we recommend that short-term tests be conducted in Teflon{reg_sign} vessels.