Low Thermal Expansion Glass Ceramics

Most of which have low or zero thermal expansion which allows them to be exposed to rapid temperature changes or localized heating or cooling.

Low thermal expansion glass ceramics.

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. Ultra low expansion glass is a registered trademark of corning incorporated. This material is produced under tightly controlled conditions and offers outstanding thermal mechanical and chemical properties.

Ceramic glassis a transparent low expansion glass ceramic with a number of outstanding features that include high resistance to thermal shock high mechanical strength and excellent electrical characteristics. Covalent materials such as diamond silicon carbide and silicon nitride have strong bonds between atoms resulting in low coefficients of thermal expansion. With an almost zero thermal expansion coefficient it is ideal for high temperature appliances. Zerodur the extremely low expansion glass ceramic has various extraordinary properties including.

Ule has been made by corning since the 1960s but is still very important to current applications. Because fine ceramics possess low coefficients of thermal expansion their distortion values with respect to changes in temperature are low. 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. Today glass ceramic products such as transparent mirror blanks and stove tops and cookware are manufactured and in daily use.

Ule has a very low coefficient of thermal expansion and contains as components silica and less than 10 titanium dioxide. Thus glass ceramics with thermal coefficients of expansion of less than 0 3 x 10 6 k 1 can be obtained. 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.

Due to the low thermal expansion las glass ceramic systems are known for their thermal shock resistance. The coefficients of thermal expansion depend on the bond strength between the atoms that make up the materials. 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. It is a glass ceramic with an extremely low thermal expansion coefficient 0 02 x 10 6 k at 0 50 c.

These products include trade names of zerodor hercuvit and pyroceram. Extremely low coefficient of thermal expansion cte coefficient of thermal expansion for a wide range of entire blanl volume temperatures. Excellent cte homogeneity throughout the total volume.