Cristobalite is a form of silica (silicon dioxide) characterized by its unique crystalline structure, which makes it particularly resistant to extremely high temperatures. It forms naturally in volcanic environments and, due to its ability to withstand thermal changes, is highly valued in ceramics.
Cristobalite is mainly used to improve the thermal stability of clay bodys and glazes, helping to prevent cracking or deformation of the pieces when exposed to extreme thermal cycles. Its incorporation in clay bodys also helps reduce shrinkage during firing, making it an ideal additive for clays that tend to warp or crack as they dry or fire.
In addition to its heat-resistant properties, it also improves durability and the ability of parts to withstand demanding conditions of use, making it a key component in the production of technical and refractory ceramics.
Interesting Fact
At extremely high temperatures it can affect the strength and stability of ceramic pieces. Cristobalite has a unique crystalline structure that changes to tridymite, another silica polymorph, at temperatures above 1470°C. This change, known as the silica transformation point, can cause ceramics to expand and crack if not properly controlled.
Helpful Tip
Use cristobalite in clay bodys when working with large-scale projects or pieces that require high thermal stability. Be sure to balance their proportion to avoid thermal expansion problems.
