Zinc Feldspar glazes
Exploration of glazes composed of a feldspar and Zinc Oxide. Bentonite is
added to produce good application
The first glaze, zn-Li has as its feldspar Petalite, so has too much Lithium,
and dunts badly.
Next on the agenda will be replacing some or all of the Petalite with other
feldspars. It will be interesting to see
inside of bowl:
Outside of bowl:
An enlarged image of the cross section of the glaze on the bowl, showing the
microcrystalline structure of the glaze,
150 deg F an hour to 250 deg F
400 deg F an hour to 1800 deg F
300 deg F an hour to 2050 deg F
120 deg F an hour to 2310 deg F with a hold of 20 minutes at 2310 deg F
300 deg F an hour to 1750 deg F then a half hour hold at 1750 deg F
300 deg F an hour to 1700 deg F then a Three hour hold at 1700 deg F
25 deg F an hour to 1650 deg F then a one hour hold at 1650 deg F
This glaze has 1.5% Nickel Oxide added
K2O 0.0005
Al2O3 0.40
SiO2 3.14
molecular percent Silica 69.2%
properties of the glaze slops. Nickel Oxide
is added for color.
The color however is stupendous.
the color when a viable glaze is
achieved.
zn-Li
which extends the entire depth
of the glaze layer.
bowl is ~3 inches in diameter
oxidation firing to cone 10 in an electric kiln
Firing profiles
Up Fire profile
Down Fire Profile
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze compositions
Empirical Formula glaze zn-Li :
Na2O 0.0049
Li2O 0.3758
CaO 0.0011
MgO 0.0067
ZnO 0.6110
Remarks
zn-li dunted as a result of high lithium.