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Introduction To Clay

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pottery. Phases of clay. Leather hard. When clay is 'leather-hard' most of ... pottery glaze and fired a second time. Kiln. A furnace used. for 'firing' ceramic ... – PowerPoint PPT presentation

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Title: Introduction To Clay


1
Introduction To Clay
2
Clay
  • Clay is formed by the decomposition of rock
    through the action of weathering.
  • Impurities, such as sticks and leaves are taken
    out and the clay is then packaged for our use.

3
Wedging
  • Kneading the clay with fingers and the heel of
    the hands in a rocking spiral motion, forces out
    trapped air pockets and helps to distribute
    moisture evenly throughout the clay.

4
Attaching clay
5
Scoring
  • Scoring is the best way of attaching one piece of
    clay to another.
  • If clay is not properly scored, it will fall
    apart either when drying or during the firing
    process.

6
Slip
  • Slip is liquid clay. Slip is applied to scored
    surfaces and acts as a sort of glue to attach
    one piece of clay to another.

7
Hand building
8
Coiling
  • Coiling is a hand building method in which walls
    are constructed with hand rolled, rope-like
    pieces of clay. The joints are then smoothed over
    to create a one solid piece.

9
Slab Rolling
  • Slab construction is another hand building
    technique, in which the clay is rolled out into
    flat pieces. The slabs are usually an even,
    consistent thickness and are then cut, scored,
    slipped, and joined together.

10
Wheel thrownpottery
11
Phases of clay
12
Leather hard
When clay is leather-hard most of the moisture
has left the clay and it feels cool to the
touch. Leather-hard clay is still soft enough
to be carved into.
13
Greenware
Greenware refers to clay that is dried and ready
to be fired.
If the clay is not completely dry before firing,
the moisture in the clay turns to steam and blows
its way out!
14
Bisqueware
Clay that has been fired once and is ready to be
glazed.
15
Glazeware
Clay that has been brushed with pottery glaze
and fired a second time.
16
Kiln
  • A furnace used
  • for firing ceramic
  • products.
  • In order for clay to
  • become permanent, it
  • must be fired at very
  • high temperatures in
  • a kiln.
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