Low Thermal Expansion Glass Ceramics

Ule has a very low coefficient of thermal expansion and contains as components silica and less than 10 titanium dioxide.

Low thermal expansion glass ceramics.

Today glass ceramic products such as transparent mirror blanks and stove tops and cookware are manufactured and in daily use. The most effective nuclei in the las glass ceramic system are tio 2 zro 2 p 2 o 5 tao 5. Zerodur is a glass ceramic composite material and has both an amorphous vitreous component and a crystalline component. With an almost zero thermal expansion coefficient it is ideal for high temperature appliances.

This material was developed by ohara based on our knowledge of high homogeneity melting and precise crystallization. Clearceram z is a glass ceramic with an ultra low thermal expansion coefficient. Thus glass ceramics with thermal coefficients of expansion of less than 0 3 x 10 6 k 1 can be obtained. Zerodur is a registered trademark of schott glass technologies.

Ule has been made by corning since the 1960s but is still very important to current applications. Covalent materials such as diamond silicon carbide and silicon nitride have strong bonds between atoms resulting in low coefficients of thermal expansion. Excellent cte homogeneity throughout the total volume. These products include trade names of zerodor hercuvit and pyroceram.

Ultra low expansion glass is a registered trademark of corning incorporated. The coefficients of thermal expansion depend on the bond strength between the atoms that make up the materials. It is produced under tightly controlled conditions and offers outstanding thermal mechanical and chemical properties. Clearceram z is a glass cer amic with an ultra low thermal expansion coefficient which was developed by ohara based on our knowledge of high homogeneity melting and precise crystallization.

Zerodur the extremely low expansion glass ceramic has various extraordinary properties including. Extremely low coefficient of thermal expansion cte coefficient of thermal expansion for a wide range of entire blanl volume temperatures. Because fine ceramics possess low coefficients of thermal expansion their distortion values with respect to changes in temperature are low. It is a glass ceramic with an extremely low thermal expansion coefficient 0 02 x 10 6 k at 0 50 c.

Due to the low thermal expansion las glass ceramic systems are known for their thermal shock resistance. Such high resistance to thermal expansion makes it very resistant to high temperature thermal shock. Even for the mass production of high quality cooktop panels ceran oven windows and other household appliances a high reproducibility of the properties is achieved.