Degradation in fracture strength of Si3N4-based ceramics by corrosion in molten alkali salts

Autor:	Tsugio Sato, Yoshimasa Koike, Masahiko Shimada, Tadashi Endo
Rok vydání:	1989
Předmět:	Materials science Mechanical Engineering Metallurgy Condensed Matter Physics Alkali metal Corrosion Shrinking core model Flexural strength Mechanics of Materials visual_art visual_art.visual_art_medium Degradation (geology) General Materials Science Ceramic
Zdroj:	Journal of the Society of Materials Science, Japan. 38:39-43
ISSN:	1880-7488 0514-5163
DOI:	10.2472/jsms.38.39
Popis:	Si3N4-based ceramics such as hot isostatically pressed Si3N4, hot pressed Si3N4, and hot pressed sialons containing 0, 30, 60 and 100% of α phase were corroded by K2SO4 and K2CO3 melts at 1150-1300°C and 925-1150°C, respectively. The surface reaction-controlled shrinking core model adequately described the relationship between the weight loss of the specimen and the time for the corrosion reactions in both K2SO4 and K2CO3 melts. The corrosion rate in K2CO3 melts decreased with increasing the content of Al and Y ions in the specimens. The fracture strength of the specimens corroded by K2SO4 and K2CO3 melts degraded to 2/3-2/5 of the original values before lossing 2% of its weight, and then became almost constant up to 30% of weight loss.
Databáze:	OpenAIRE
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