ceramics
DESCRIPTION
Ceramics. Potters create vessels What are vessels?. Vessel : a container (as a cask, bottle, kettle, cup, or bowl) for holding something. Clay Stages. 1. Slip A slurry of clay and water, used as glue or for casting. Clay Stages. 1.Slip 2. Wet clay - PowerPoint PPT PresentationTRANSCRIPT
Ceramics
Potters create vesselsWhat are vessels?
Vessel: a container (as a cask, bottle,
kettle, cup,
or bowl)
for holding
something
Clay Stages
1. Slip
A slurry of clay and water,
used as glue
or for casting
Clay Stages• 1. Slip • 2. Wet clay
Plastic enough to wheel throw
or hand build
Clay Stages
• 1. Slip• 2. Wet clay• 3. LeatherhardSlightly dried clay
that can be joined and carved
Clay Stages• 1. Slip• 2. Wet clay• 3. Leatherhard
• 4. Greenware• Bone-dry clay
that is ready to be fired in the kiln.
Clay Stages
• 1. Slip• 2. Wet clay• 3. Leatherhard• 4. Greenware
• 5. Bisqueware
Fired clay that is ready to glaze and glaze fire.
Clay Stages• 1. Slip• 2. Wet clay• 3. Leatherhard• 4. Greenware• 5. Bisqueware
• 6. GlazewareFinished ceramic
piece, fired twice in the kiln
Wedging clay
Knead clay
with the palms
of your hands
to remove air bubbles which cause ceramics to explode
in the kiln.
Forming methods• PinchpotMake a ball in
your hands, push your thumbs in and then widen the hole with your fingers.
Forming methods
• Pinchpot
• CoilMake coil
snakes and layer them to build onto pinchpot base.
Forming methods
• Pinchpot
• Coil
• Slab
Attaching flat pieces of clay together.
Forming methods
• Pinchpot
• Coil
• Slab
• Drape Mold
Flat clay draped over a form
Forming methods
• Pinchpot• Coil• Slab• Drape Mold
• Slip CastLiquid clay
poured into a mold
Forming methods
• Pinchpot• Coil• Slab• Drape Mold• Slip Cast
• Wheel ThrownWet clay formed On a spinning
wheel
Underglazing Greenware
Brush on underglaze for
detailed designs.
It is dripless
and does not crack. After bisque firing,
It remains the color brush on clear
it appears before firing. glaze to waterproof.
Firing ceramics in the kiln
A kiln is an oven that heats clay
to a high temperature
to remove all moisture from ceramics.
This makes ceramics more durable
and stable.
Glazing Bisqueware
Brush three layers of glaze onto your bisqueware or dip it once.
When dry, wipe all glaze from the bottom so it will not stick the kiln shelf.
You may etch designs into the glaze so bisqueware shows through.
Add clear glaze as
a final waterproof coat.
Reclaiming clayReclaiming clay is the process to make hardened
clay plastic (wet clay) again.
It is not possible to reclaim fired clay.
Clay may be reclaimed indefinitely.
Just add hardened clay to the reclaim bucket.The added water will soften the clay and it can be
reused after some drying. The liquid clay in the reclaim bucket is slip.
Reclaiming clay
Joining Clay in the Leatherhard Stage
Score (make velcro)Score (on other piece too)Wet (use a little slip)Wiggle (push the pieces
together)Smooth!!! (the join should be
invisible)
Ceramics QuizDefine the following terms in your own words.
1. Greenware 6. Coil Method
2. Wedging 7. Bisqueware
3. Kiln 8. Vessel
4. Reclaiming 9. Leatherhard
5. Wet clay 10. Underglaze