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ceramics

QuestionAnswer
Clay is the result of weathering of feldspar-rich rocks (like granite)
Al₂O₃-2SiO₂-2H₂O Formula for kaolinite, basic clay material
Raw clay Natural
Clay body blended recipe of clays/additives.
Platelets Flat particles affecting plasticity, shrinkage, drying strength, water absorption, texture
Particle alignment Wedging/throwing/compressing aligns particles -> more strength, less cracking
High fire High (cone 5-10): stoneware/porcelain, stronger.
low fire Low (cone 06-04): porous, bright glazes.
clay stages Plastic; Leather-hard; Bone dry.
Reasons to bisque fire: 1) Strengthen clay; 2) Burn out organics/water; 3) Make porous for glaze.
Primary Clay Primary = pure, less plastic.
Vitreous: Dense, glass-like, non-porous
Which clays are vitreous? Porcelain, high-fire stoneware.
Hole to prevent explosions: Vent hole.
What is glaze? A glass coating melted onto clay
Why glaze? Seal; decorate; strengthen
Three glaze components: Silica; Alumina; Flux
Glaze Functions: Silica = glass; Alumina = structure; Flux = melting.
Glaze application methods: Dipping, pouring, brushing, spraying.
Glaze thickness: Credit-card thickness / 2-3 coats,
Viscosity: Thickness/flow of a liquid.
Kiln evolution: Pit -> bonfire - updraft -> downdraft -> electric,
Kiln: High-temperature furnace.
Firing temperatures: Bisque Cone 04 ≈1940°F Glaze Cone 5-6 ≈ 2167-2232 °F
Atmosphere: Oxygen level affects glaze/clay results; electric = oxidation
Pyrometric cone: Measures heat-work, bends at specific maturity.
Bisque firing is done to: Harden clay; Burn out organics/water; Make porous for glaze
Secondary clays: Secondary = impure, more plastic
Created by: user-2011797
 

 



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