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Corrosion of Silicon Nitride Ceramics by Nitric Acid

Published online by Cambridge University Press:  25 February 2011

Kunihiko Kanbara ,
N. Uchida ,
K. Uematsu ,
T. Kurita ,
K. Yoshimoto  and
Y. Suzuki
Kunihiko Kanbara
Affiliation:
Nagaoka University of Technology, Nagaoka, Niigata, Japan
N. Uchida
Affiliation:
Nagaoka University of Technology, Nagaoka, Niigata, Japan
K. Uematsu
Affiliation:
Nagaoka University of Technology, Nagaoka, Niigata, Japan
T. Kurita
Affiliation:
Power Reactor and Nuclear Fuel Development Co., Tokai-mura, Ibaraki, Japan
K. Yoshimoto
Affiliation:
Power Reactor and Nuclear Fuel Development Co., Tokai-mura, Ibaraki, Japan
Y. Suzuki
Affiliation:
Nagaoka University of Technology, Nagaoka, Niigata, Japan
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Abstract

Corrosion of silicon nitride was studied in boiling nitric acid to examine its feasibility as a drying pan material in the reprocessing of nuclear fuel. Unlike stainless steel (a conventional drying pan material), the weight loss and strength degradation were negligible in the concentration of nitric acid. The corrosion increased with decreasing concentration of nitric acid. At the concentration of 1-6N, the maximum losses of weight and strength were 0.8% and over 40%, respectively, in 200 h. Ionic species dissolved in nitric acid were determined by ICP analysis and were found to be accurately correlated to the weight loss and thickness of the corrosion layer determined by micrography. In the corrosion layer, grain boundary glassy phase was selectively dissolved. Strength loss was correlated to the weight loss and was ascribed to the reduced load bearing area due to corrosion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 287: Symposium K – Silicon Nitride Ceramics–Scientific and Technological Advances , 1992 , 533
Copyright
Copyright © Materials Research Society 1993

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References

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