Volatilization
The term volatilizing refers to the process by which certain materials, such as metal oxides, evaporate at high temperatures and are then redeposited in other areas of the kiln or on other ceramic pieces during firing. This phenomenon is common in high-temperature firings, where chemical compounds present in glazes or clay can sublimate and move as vapor within the kiln environment.
Volatilization can have both positive and negative effects on the finish of ceramic pieces. On the one hand, it can be used intentionally to create unique decorative effects, such as colored spots, irregular textures or gradients in the glaze. On the other hand, uncontrolled volatilization can cause unwanted defects, such as discolorations, irregular stains or loss of fine details in the applied decorations.
Volatilization management is crucial to maintain the quality and consistency of ceramic pieces, especially in industrial production processes where repeatability and precision are critical. This involves carefully selecting vitrifying materials, adjusting firing conditions and using appropriate ventilation or filtration systems to control the spread of vapors within the kiln.Interesting Fact
In the production of artistic ceramics, some ceramists take advantage of the volatilization of metal oxides such as copper or cobalt to create unpredictable patterns in their glazes. That is, the vapors of the oxides are allowed to interact freely with the surface of the pieces, generating visual effects that reflect spontaneity and creativity in the firing process.Helpful Tip
To minimize the undesirable effects of volatilization, it is advisable to maintain a balanced distribution of parts within the kiln and avoid concentrating highly volatile materials in specific areas. Also, consider using protective coatings or barriers to limit direct exposure of certain areas to vapors. Pre-test to understand how your vitrifying materials react under different firing conditions and adjust kiln variables accordingly to achieve the desired results.