Transcript CERAMICS - Pearl Quick

CERAMICS
CLAY SLAB
platter
CLAY
 Mud; moist, sticky dirt.
 In ceramics, clay is finegrained,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
plate.
Clay Slab
 You will be given a ball of clay and
and a plate template.
 Use your palms to flatten clay into
a 1 inch thick circular clay slab.
Clay Slab
 Keeping the slab circular, use a
rolling pin to even the surface.
Clay Platter
 When the slab is large enough, lay
the plate template upside-down on
the clay slab. Keeping the clay on
the plate, flip the plate so it is right
side up.
Clay Platter
 Use finger tips to gently mold and
smooth the clay into the shape of the
plate.
 Use a tool to cut access clay from
around edge and smooth.
 A small clay “snake”
may be added to the
outside edge
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. The
clay can be taken from the template
at this stage.
Bone Dry
 When finished, your greenware
plate needs to be thoroughly
dry before it can be fired.
 This stage of drying is called
bone dry.
Greenware - Bisque
Unfired clay
Is called
Green ware
 Fired clay is
called
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 plate 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.