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High temperature stabilized mullite-aluminum titanate

  • US 5,290,739 A
  • Filed: 09/22/1992
  • Issued: 03/01/1994
  • Est. Priority Date: 09/22/1992
  • Status: Expired due to Term
First Claim
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1. A method of producing a high temperature stabilized mullite-aluminum-titanate article, the article consisting essentially, expressed in weight percent based on the oxides, of 1.5-20%, SiO2, 5-25% Fe2 O3, 35-75% Al2 O3, and 10-40% TiO2, said method comprising the steps of:

  • forming doped mullite by a process selected from;

    (1) doping mullite with dopant selected from titania, titania precursors, hematite, and hematite precursors to form doped mullite; and

    (2) pre-reacting mullite precursors with dopant selected from titania, titania precursors, hematite, and hematite precursors to form doped mullite precursors;

    calcining and milling the doped mullite;

    calcining and milling aluminum-titanate;

    mixing the mullite and the aluminum-titanate with a binder to form a ceramic batch;

    shaping the ceramic batch to form a green ceramic article; and

    firing the green ceramic article at a temperature and for a duration of time sufficient to form the sintered ceramic article.

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