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glazenerd

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About glazenerd

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    Clay Research

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    Male
  • Location
    St. Louis, Mo.
  • Interests
    Crystalline glaze chemistry. Porcelain, Stoneware, Fritware, 04 Colored Porcelain clay research & formulation.
    Ceramics Monthly Articles: Jan. 2018 Cation Exchange (plasticity), April 2018 SSA Clay Formulation, May 2018 Bloating and Coring.
    Feb. 2019 Ceramics Monthly- Clay Body Shopping Guide
    March 2019 Ceramics Monthly - Porcelain 201

    Email: optix52@aol.com

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  1. Finished chapter three, now on to testing "iron" limits. Then the effects of sulfides and carbons: and their limits.

    1. Show previous comments  2 more
    2. glazenerd

      glazenerd

      Marcia: 

      sulfur melts at low temperatures and vaporize well below bisq temps. The problem is that  sulfur anions bond with almost every other element. In our case iron: ferrous sulfide. Once that bond takes place, which occurs below bisq temps: that bond creates an impermeable barrier that the off gassing of spars and carbons cannot  penetrate. This chain reaction is the basis of bloating. The question is: at what level of sulfides?

    3. Marcia Selsor

      Marcia Selsor

      in my foil saggars. I use a lot of them. PS I found my crystalline glaze thesis written on a type writer in 1973. Want a copy? I can scan and send you via email. Pls remember it was written almost half a century ago about work done a half century prior to that. maybe I should read it first. -_-

    4. Marcia Selsor

      Marcia Selsor

      it discusses temp. for various crystal shapes, limit formulas etc.

       

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