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Intro. to CLAY!
Transcript of Intro. to CLAY!
CLAY vs. CERAMICS
1. earth made up of minerals, plant life, and animals (all the ingredients of soil) and is used for making bricks, pottery, & tiles.
2. wet earth or ground; mud.
1. pots and other articles made from clay hardened by heat
There are 2 basic methods for wedging clay: slamming and kneading.
Why do we wedge clay?
To remove air pockets
To remove excess moisture
To ensure that clay has a uniform consistency
6 Stages of Clay
Slip - watered down clay; "pottery glue"
Wet/Plastic - what we use to build, mold, and construct
Leather Hard - halfway dry; best for carving
Bone Dry - fully dried and ready for the kiln; brittle and fragile
Bisqueware - has been fired in the kiln once
Glazeware - has been fired in the kiln twice; now has a 'shiny coat'
Kiln = "clay oven"; hardens clay into ceramics
Glazing not only makes ceramic items more decorative, it also creates a seal that makes them water tight. When fired, ceramic glaze melts to form a glass-like layer on the surface of a pot.
Firing is what transforms soft clay into hard ceramic.
Different types of firing:
Open firing - Pottery is fired in a pit or bonfire, usually at a lower temperature
Kiln firing - Pottery is fired in an enclosed structure that is capable of achieving very high temperatures and provies a greater level of control than open firing.
Bisque firing - The initial firing which changes clay into ceramic, or from greenware to bisqueware, at least 1700F.
Glaze firing - The final firing in which pottery has been painted with glaze, then fired to create a glass like finish which acts as a seal. The resulting pottery is called glazeware, at least 1850F.
Using the exposed coil method, create a ceramic vessel that serves a specific purpose.