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Intro. to CLAY!

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by

Me Cl

on 7 December 2015

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Transcript of Intro. to CLAY!

Introduction to CLAY!
The Basics
The Inspiration
The Challenge
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
Wedging Clay
There are 2 basic methods for wedging clay: slamming and kneading.
Why do we wedge clay?
3 reasons:
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
Clay Techniques
Pinch Pots
Coils
Slab
Wheel
Glazing
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 Clay
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.
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