Glaze Teach Study Units

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Glaze Basics

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Introduction
What is a glaze?
What is glass?
Silica's melting point.
Using fluxes.
Stabilising the glaze.
Theoretical glaze.
Making a glaze.
What is an oxide?
Chemicals in a glaze.
Oxide classifications.
Raw material examples.
Heating raw materials.

What are fritts?
A stoneware glaze.

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The Glass Triangle

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Introduction
Schematic model.
Making clear glass.
Imbalanced constituents.
Excessive flux.
Excessive amphoteric.
Excessive acid.
Temperature influence.
Focus on Raw Materials

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Introduction
What is a glaze recipe?
Know your materials.
Manipulating recipes.
Changing the maturing temperature.
How to change temperature.
Increasing flux.
Lowering amphoteric & acid.
Determining qualities.
Using a line blend.
Using a triaxial blend
Changes for texture.
The Unity Formula

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Introduction
What is a unity formua?
Who was Seger?
Unity formula format.
Molecular ratios.
Unifying a formula.
Glaze / clay unity.
Fractions of molecules?
Advantages of unity formulae.
Are glazes the same?
Usefulness of unity formulae.
Recipe to formula calculations.
Raw materia data.
Determining unity.
Formua to recipe calculations.
Interpreting Unity Formulae

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Introduction
How to interpret unity.
Other factors.
Information needed.
Limit formulae.
Value of limit formulae.
Uses for limit formulae.
The Al:Si ratio.
Significance of the Al:Si ratio.
Coefficients of expansion.
Interpreting coefficients of expansion.
Using coefficients of expansion.
Oxide Qualities

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Introduction
Sodium Oxide - Na2O
Potassium Oxide - K2O
Potassium + Sodium Oxides - KNO
Calcium Oxide - CaO
Magnesium Oxide - MgO
Barium Oxide - BaO
Zinc Oxide - ZnO
Lead Oxide - PbO
Lithium Oxide - Li2O
Strontium Oxide - SrO
Aluminium Oxide - Al2O3
Phosphorus Pentoxide - P2O5
Boron - B2O3
Silica - SiO2
Titanium Dioxide - TiO2
Zirconium Dioxide - ZrO2
Tin Oxide - SnO2
Using Unity Formulae

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Introduction
What are unity formulae?
Using limit formulae.
Determining maturing temperature.
What is the alumina:silica ratio?
Changing maturing temperature.
Altering fluxes for temperature change.
Using B2O3 to lower temperature.
Controlling texture and opacity.
Clear glaze indicators.
Indicators of opacity and texture.
Achieving texture change.
Using blends for texture change.
What is the coefficient of expansion?
Calculating the coefficient of expansion.
What is glaze fit?
Clay / glaze coefficient
Importance of glaze fit.
Using the coefficient of expansion.
Controlling crazing.
Changing raw materials.
 
   
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