Kiln pottery firing

Kiln firing transforms clay into durable ceramic pieces, involving temperature control, atmosphere, and specific kiln types.

About this subject

The kiln firing process is essential in ceramics, transforming clay into durable material. Different types of kilns exist, such as electric, gas, and wood-fired, each imparting unique characteristics to the pieces. Temperature varies according to clay and glaze type, reaching over 1300°C. Firing can be low-temperature (terracotta) or high-temperature (stoneware, porcelain). Controlling the kiln atmosphere (oxidizing or reducing) also influences glaze color and texture. Historically, ceramic kilns have been used for millennia, with examples in ancient China and Greek pottery. The raku technique, for instance, involves removing the glowing piece from the kiln and subjecting it to thermal shock. Additionally, wood firing requires constant attention and can yield effects like natural vitrified ash. For potters, mastering the kiln is crucial for the final outcome.

Frequently Asked Questions

What is the difference between electric and gas kilns in ceramics?

Electric kilns offer precise temperature control and an oxidizing atmosphere, ideal for low-temperature glazes. Gas kilns allow reducing atmospheres, creating more varied color and texture effects, especially in high-fire ceramics.

What is raku firing?

Raku is a Japanese fast-firing technique where the piece is removed from the kiln while glowing and placed in a container with combustible material, causing thermal shock and crackle/smoke effects.

How does kiln atmosphere affect the outcome?

Oxidizing atmosphere (excess oxygen) enhances glaze colors, while reducing atmosphere (lack of oxygen) alters color of oxides, e.g., copper turns red. Control is through air intake or use of reducers.