Corrosion behavior of silicon nitride ceramics in aqueous solutions (Part 3). Corrosion behavior in hot sulfuric acid and microstructure of corroded layer

Satoshi Iio, Akira Okada, Tetsuo Asano, Masahiro Yoshimura

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Corrosion behavior of gas pressure sintered silicon nitride ceramics was investigated in sulfuric acid solution with respect to the effect of solution temperature and to the microstructure of corroded layer. Weight loss of samples after corrosion test was severe in boiling solution as compared with in 90°C solution. Nevertheless strength degradation occurred similarly in each solution. The gradual growth of corrosion is considered to be controlled by the dissolution reaction of grain boundary phase of silicon nitride ceramics in sulfuric acid solution. The drastic strength degradation at initial stage is considered to be ascribed to the relaxation of the residual compressive stress during corrosion which was introduced on surfaces of specimens by machining.

Original languageEnglish
Pages (from-to)965-967
Number of pages3
JournalJournal of the Ceramic Society of Japan. International ed.
Volume100
Issue number7
Publication statusPublished - 1992 Jul 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Ceramics and Composites

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