This site explains the changes, the excerpt is a small explanation:
The item is heated to temperatures up to 1170oC, during which time the clay undergoes
some chemical changes and the silica and feldspar undergo physical changes. The
reactions of the clay can be summarised as follows:
6Al2Si2O5(OH)4 ? 6Al2Si2O7 ? 3Al4Si3O12 ? 2Al6Si2O13
kaolinite metakaolinite silicon spinel mullite
Silica and water (from the crystal lattice) are also expelled during firing, resulting in a
further 5 - 7% volume reduction. This silica mixes with the silica already present and
melts to form a glass. It is this glass, which also includes metallic ions from the
feldspar, that makes the ceramic item non-porous and water-tight.
* The site: http://www.nzic.org.nz/ChemProcesses/inorganic/9C.pdf
Clay is generally fired in two firings: when unglazed clay is fired in a low firing, it is called bisque. In this state, the clay will still absorb water, but it will not dissolve. Next, the clay is glazed and high-fired and is called ceramic or stoneware or porcelain, depending on the type of clay used. Some clays vitrify (become glasslike) after high firing and don't need to be glazed.
This site explains the changes, the excerpt is a small explanation:
The item is heated to temperatures up to 1170oC, during which time the clay undergoes
some chemical changes and the silica and feldspar undergo physical changes. The
reactions of the clay can be summarised as follows:
6Al2Si2O5(OH)4 → 6Al2Si2O7 → 3Al4Si3O12 → 2Al6Si2O13
kaolinite metakaolinite silicon spinel mullite
Silica and water (from the crystal lattice) are also expelled during firing, resulting in a
further 5 - 7% volume reduction. This silica mixes with the silica already present and
melts to form a glass. It is this glass, which also includes metallic ions from the
feldspar, that makes the ceramic item non-porous and water-tight.
* The site: http://www.nzic.org.nz/ChemProcesses/inorganic/9C.pdf
in a kiln
Clay is fired in a kiln.
Of course not!
Firing clay is when a clay is fired in a kiln, this is to make the clay stay strong.
bisque is the name of the hardened clay called after the first firing in the kiln.
As long as the clay has not been fired in the kiln, it can be recycled.
Clay is fired in a kiln.
Of course not!
kiln
Firing clay is when a clay is fired in a kiln, this is to make the clay stay strong.
. Both: Bisque fire, glaze, Glost fire
bisque is the name of the hardened clay called after the first firing in the kiln.
It is a natural resource, fired by hand.
As long as the clay has not been fired in the kiln, it can be recycled.
You can fire clay anytime after it has been crafted.
Clay is either put into a mold and then fired, or thrown on a wheel by a potter and then fired, or hand sculpted and then fired.
Glaze.
they usually made of clay or mud clay then they fired it and used it for whatever