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CERAMICS

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					CERAMICS
 CLAY SLAB
 Container
Bug theme
Candy theme
Flower theme
Bait theme
Pyramid theme
               CLAY
 Mud; moist, sticky dirt.
 In ceramics, clay is fine-
  grained,firm earthy material that is
  plastic when wet, brittle when dry,
  and very hard when heated.
The most common types of
    ceramic clays are:

 earthenware,
 stoneware, and
 porcelain.
          Earthenware
 Earthenware is a low-fire clay that
  is porous and not waterproof.
 It can be made waterproof by
  glazing it.
 You will use earthenware clay to
  roll out a slab and create a ceramic
  container.
          Clay Slab Plan
 First plan on newsprint.
 What will be your theme…Nature or
  man-made?
 What shape expresses your theme?
 What decoration helps express the
  theme?
 Does the container need additions…
  “feet”, handles, top, lid, pictures?
           Clay Slab Plan
 Roll out a slab of clay
 Cut the sides, then bottom & top
                Clay Slab
 REMEMBER when measuring,
             clay has thickness.
Decide how the sides will overlap and how
 thick the slabs will be before figuring the
 size of the bottom of the slab piece.
For example:
                           or
When the slabs are rolled out, and
they are cut to size, they should be
 allowed to dry to the leather-hard
     stage before assembling .
          Leather-hard
This is the first stage of drying. There
 is still moisture in the clay, but it is
 just dry enough to hold its shape
 and not “slump” This stage of
 drying is called leather-hard.
When the slabs are leather hard,
   they can be assembled by
    scoring (scratching) and
slipping the edges to be joined.

 What is scoring and slipping????
Score the clay that is to be joined
    Make
 scratches in
the pieces of
  clay to be
    joined
  together.
Roughen the
   surface.
Add clay slip to the scored pieces
     to join them together.
                    Clay slip is a fine,
                     liquid form of clay
                     used to cement
                     together parts that
                     have been formed
                     separately. Mixing
                     finely ground clay
                     with water makes
                     clay slip.
  The scratched and
 slipped edges should
   be pressed firmly
together and the joints
 blended with a finger
  tip or a small tool.
                          Square corners should be given
                            additional support on the
                            inside. Make a coil the size of
                            an earthworm, lay it carefully
                            in the inside corner and
                            smooth it into each side of the
                            corner.
          Bone Dry
 When finished, your greenware
  container needs to be thoroughly
  dry before it can be fired.
 This stage of drying is called
  bone dry.
    Greenware -      Bisque
Unfired clay is    Fired clay is
called               called
Green ware           Bisque ware
               Firing
 Clay is hardened by heating it to a
  high temperature, thus fusing the
  clay particles. Temperature in kilns
  can reach 2500 degrees.
              Glaze
 The bisque clay container is now
  ready to be glazed.
 Glaze is a coating of material
  applied to ceramics that forms a
  glass-like surface when fired a
  second time.

				
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posted:5/1/2013
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