Titanium

cone 10 oxidation

Firing profile

Up Fire profile

150 deg F an hour to 250 deg F

400 deg F an hour to 2050 deg F

120 deg F an hour to 2250 deg F

60 deg F an hour to 2310 deg F with a hold of 20 minutes at 2310 deg F

Down Fire Profile

A half hour hold at 1750 deg F

A three hour hold at 1700 deg F

slow downfire at 25 deg F an hour in the interval 1700 deg F to 1650 deg F

A one hour hold at 1650 deg F

Clay body is a grolleg porcelain from Tacoma Clay Art Center.

I show two glazes, a saturated iron glaze, and that glaze modified by the addition of 3 % by weight of Titanium Dioxide.

The added rutile decreased the viscosity of the base glaze, so that it flowed over a large part of the kiln shelf near and under the pot.

Titanium Dioxide is a glass former so is found in the third column with Silica in the Seger or Empirical Formula.

glaze composition

Emperical Formula satIron_ZJ_1PPP

K2O        0.02
Na2O        0.31
Li2O        0.25
CaO        0.40
MgO        0.02

Al2O3        .49
Fe2O3        .21

SiO2        3.1
P2O5        .13

molecular percent Silica 63 %

The bowls are ~ 3 inches in diameter.

The glaze is shown on the inside and outside, resp left and right.

Glaze mashiko_ZJ_1PPP

Glaze mashiko_ZJ_1PPP with an addition of 3 % by weight of TiO2