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BEFORE HEAT

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AFTER HEAT

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Understanding Pottery Chapter 8 Glaze Chemistry Part 1

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Creating a recipe for a specific temperature

Could you please lead me to the information on Glazy.org to use the UMF for the purpose of creating a recipe for a specific temperature. At this stage I just want the principles to then explore glaze qualities as I progress. I am want to adjust glazes from cone 10 to cone 8. Thank you, Kevin

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A 1250°C más 30 minutos de remojo, sobre gres tostado, en horno eléctrico

Parece que algo no salió bien, no se ve turquesa y no hay cristales. No sé si faltó o sobró temperatura

1 day ago

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Recently added posts, recipes, materials, comments and reviews

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https://edu.rsc.org/feature/the-chemistry-of-pottery/2020245.article

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Silica, the short name for silicon dioxide (SiO2) is by far the most common glass former. Boron and phosphorus are also glass formers, but are usually mixed with silica. Silica molecules join together to form strong, giant networks. Each oxygen atom is shared by two silicon atoms and as the molecules combine, they chemically form covalent bonds in a tetrahedron with a silicon atom at the center and oxygen atoms at the corners. This structure requires extremely high temperatures to melt -3110 F/1710 C- and therefore a flux is required to drop the melting point to a reasonable measure.

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Alumina, titanium oxide, and zirconium oxide are common stabilizers. Alumina has a structure that is close-packed and almost hexagonal, a which acts as a good stabilizer.

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* They are the compounds responsible for forming the crystal lattice. * They are therefore firm elements. Being amphoteric (dual compound) it acts in one way or another depending on which compound is present. Either a metal or non-metal. *In more common words they are compounds that adapt to the situation and yield to the presence of others, but have character.

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As its name says, they are compunds responsible for providing the glass to the glaze.

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The most common fluxes are sodium, potassium, calcium, and barium, all alkali metals. Sodium oxide, when mixed with water, becomes sodium hydroxide (NaOH). When sodium oxide reacts with silica, it breaks up the silica network, making it easier to melt it down, acting as a flux.

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*Lower or raise the melting point
* Generate molecular kinetic motion in the presence of heat, thus increasing Entropy. Entropy is desorder, chaos. This is one of the basic Termodinamic concepts that amaze me because is the measure of desorder. We live in a world that is dinamic and the molecular movements makes desorder, nothing is perfect. Excellent teach of nature!!!
*They need another compound to organize the molecules.

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THE QUESTION IS: WHICH ARE THE COMPOUNDS THAT FORM THE PRECIOUS LIQUID THAT PROVIDE CARACTER TO OUR CERAMICS?

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THE QUESTION IS: WHICH ARE THE COMPOUNDS THAT FORM THE PRECIOUS LIQUID THAT PROVIDE CARACTER TO OUR CERAMICS?

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At the begginings of my interaction with ceramics, I found myself throwing and improve my technique. I have to recognize that mean while I was throwing, I was also imagine in my head how my pieces will look with different glazes. Then I realized I had no knowledge of this processes of glazes production and of that specific topic, so I decided to learn about this. This  was almost three years ago, every step to learn was autonomous process, thanks YouTube and Jhon Britt (https://www.youtube.com/c/johnbrittpottery) for all the information, but I was missing someone that can solve some specific questions I had about the chemestry of the compunds. Finally this year I found my Neo, the chosen one hahaha. His name is Ovelio. He is from Venezuela and cames to Colombia to live in Medellin, as we all know, the economical situation of Venezuela is really hard, so he migrate to Medellin since his wife is from there. Ovelio, such a nice man, used to worked with "Materiales cerámicos Matcer CA and Colorificio Pordecar" in Venezuela, he have a lot of experience and knowledge, the best part is that he is open to share this knowledge and I´m like a little sponge full of curosity and willing to absorb all the possible information. At the moment I´m working with him and this has been the best month of my glaze ceramic life indeed. One thing for sure is that Ove has  explained to me the interactions of chemical compounds, what gives them their shape and character. With this information, now, I´m able to understand the material in order to formulate my own glazes and also to get closer to the understanding of the matter. I want to share this with whoever wants to read me and know me as well. Here is the first steps of my investigative process in case there is someone looking for answers to those same doubts I used to had.