Magnolia Mud Research
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Status Replies posted by Magnolia Mud Research
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Off for awhile now. So I am going to read a book written long ago by one of the foremost slip chemist.
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what book by what chemist?
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Starting to read thru the gerstley borate substitute items on the forum. Has anyone tried Tom Buck's dry mix substitute? Or do you think its less problematic to just go with Gillespie Borate?
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Laguna purchased the entire pile of GB at the mine and has enough to last a looong time.
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Morning all. This is probably a basic question to many of you , but my Chemistry knowledge is not great and I would appreciate some help. Is it possible to change an earthenware clear gloss glaze (firing to 1100 centigrade) to a higher firing stoneware glaze (firing to 1200 centigrade) without knowing the formula of the original glaze. I am sure this question is answered in Digital Fire or somewhere on this forum, but I am feeling a bit lazy to search through- got too much playing in the studio to do!
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I have used thin coatings of commercial earthenware clear glazes on bisque ware fired to cone 10(reduction) without problems. The earthenware glazes matures (fully melted) at about the same temperature as bisque firing; this means that the ware surface is quite porous when the glaze melt forms and the melted glaze soaks into the surface pores. The effect is generally a thin transparent covering with some gloss. The surface is visually smooth while the clay surface fine markings are still tactilely available. Keep the application thin until you have data on maximum allowable thickness for your work and firing situation.
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Finished COE graphs, alumina to CEC comparison charts. Okay, so I lead a boring life! It is what we Nerds do.
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Ooo Kaaay.
Still, such a correlation would be nice. Measure CEC and get a COE as a bonus.
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Finished COE graphs, alumina to CEC comparison charts. Okay, so I lead a boring life! It is what we Nerds do.
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COE is a useful material property after firing; the material is significantly changed (aka chemical reactions have taken place) from the water/solids mixture where CEC is measured. An empirical correlation based on a large and wide ranging data set would be interesting and perhaps useful.
What leads you to expect there is a causal relationship between Coefficient Of Expansion and Cation Exchange Capacity?
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I am reading a book on clay body formulation from 1959: and the information is relatively the same as in 2017. Why does this bother me?
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A little neph sy and kaolin at cone 5 would be work just fine too.
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