Nepheline and carnegieite ceramics from A-type zeolites by microwave heating

Tatsuo Ohgushi, Kazushi Ishimaru, Sridhar Komarneni

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The thermal disintegration processes of A-type zeolites and the properties of the materials that were formed after microwave heating (at 2.45 GHz) were studied. The thermal disintegration of 4A-type zeolite proceeded as follows: disintegration at approximately 880 °C, followed by transformations to high-carnegieite 1 at approximately 920 °C, nepheline (in nepheline(4A) form) at approximately 990 °C, and high-carnegieite 2 at approximately 1254 °C (further heating led to melting at approximately 1526 °C). High-carnegieite 1, nepheline(4A), and high-carnegieite 2 efficiently absorbed microwaves. Cooling of the molten material yielded low-carnegieite that contained some impurities. The change of 3A-type zeolite proceeded as follows: disintegration at approximately 910 °C and transformation to nepheline (in nepheline(3A) form) at approximately 1006 °C. In 3A-type zeolite, in contrast to 4A-type zeolite, carnegieite did not form before the crystallization of nepheline(3A). Nepheline of high purity and carnegieite with some impurities were synthesized easily by heating 3A- and 4A-type zeolites, respectively, using microwaves. These results suggest that the microwave heating of zeolites can be used to prepare some ceramic materials.

Original languageEnglish (US)
Pages (from-to)321-327
Number of pages7
JournalJournal of the American Ceramic Society
Volume84
Issue number2
DOIs
StatePublished - 2001

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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