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Kiln Science

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by

I. Nygaard

on 3 April 2014

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Transcript of Kiln Science

Kiln Science
Bisque Firing
Glaze Firing
Gloss Glaze
is shiny
Underglaze is matte
(not shiny)
Can be made shiny by putting a clear gloss glaze over the top…

Liquid Texture Glaze
Kiln Science!
What did we learn?
Our Electric Kiln
Physical Change
No new substance is produced

IT IS STILL CLAY!

May involve a change in state
(Think solid, liquid, gas; not Minnesota or Wisconsin)

When it is wet , clay is plastic
As it dries, it becomes a solid

It can usually be reversed

Just add water

Chemical Change
To make a permanent change
we need the heat of the kiln to make a chemical change.

New substances are made
Difficult to reverse if at all

May change color
Give off an odor or smell
Create gas


What happens in the kiln?

What is a kiln?

What does it do?
Bisque Fired: Hard as rock
What is a Kiln?
It is like an oven
The clay is “baked” in the kiln
Kiln “firing” changes the clay!

After Glaze Firing
Is the first firing that clay will go through

Makes the clay insoluble
(It won’t dissolve in water)

Makes the clay porous
(It will absorb some water)

Prepares the clay to accept glaze





There are
2
times you use a kiln!
Kiln firing causes both
physical and chemical changes
Heat causes expansion
Minerals and elements in the clay change
The structure of Silica molecules rearrange
Carbon burns
Gases are released
At 900°F, water (H2O) molecules begin to break free leaving tiny holes* behind
*Remember the tiny holes
At 1100°F the remaining clay particles fuse together forming a glass-like solid.


Firing Process
Vitrification!
High Heat + Clay =
burning gases and melting solids

Melted solids+ cool temperatures =
insoluble clay

insoluble clay = water will not dissolve it

Vitrification!
They are pores that absorb the water in the glaze so the glaze sticks to the pot!

**Remember the
tiny holes?

Before Bisque Firing

Just dry clay
Is it a physical change or a chemical change at this point in the clay life?
After Glaze Firing
Glaze: a liquid mixture of minerals and elements that have glass-like properties.

Glazes:
There are 3 glazes we will be using
Admission ticket:
Answer our Essential Question, How does heat change clay?
The glaze firing is the second time we fire our clay, this time with glaze that we have painted on it.
What would happen if we added water to it right now?
Physical change?
or
Chemical change?


Can it be “UN-DONE” ???

Is it like dough or like a rock?






Physical Change in Clay!!!
Chemical Changes in Clay
What changes do you notice about your clay today?
Ms. Nygaard
Full transcript