Performance and application of SCHOTT glass-ceramic Zerodur K20
Schott AG is an international high-tech group headquartered in Germany, founded in 1884 with a long history and strong technical strength. The group mainly produces and sells specialty glass, glass-ceramic and other materials, which are widely used in various fields, such as lighting, display, home appliances, pharmaceuticals, etc.
Zerodur K20 glass-ceramic:
ZERODUR is a material with excellent thermal properties and precision in high-tech applications. Often, these applications also have to withstand certain mechanical loads, such as permanent use of telescopic mirror mounts or for short periods of time during rocket launches.
The key factor to be evaluated to quantify the zerodur fracture load is the surface quality, especially the occurrence of microcracks. In general, loads with tensile stresses below 10 MPa do not require a special fracture analysis of ZERODUR.
SCHOTT's extensive data on grinding zerodur specimens for fracture events shows that they can withstand long-term (decades) mechanical loads of 30 to 100 MPa. This is much higher than expected. On the basis of the Weibull distribution with three parameters, we would be happy to discuss the service life of the ZERODUR under your personal long-term mechanical load.
Advantages:1Extremely low thermal expansion.
When exposed to high temperatures, the crystallites of its duplex microsystem shrink as the surrounding glass matrix expands. This results in an overall expansion of almost zero and an accuracy of up to 0 7 ppb k at ambient temperature.
2.Poor condition.
In addition to being resistant to large temperature differences, ZERODUR is also suitable for applications with mechanical loads of up to 100 MPa. With our years of breaking load expertise and data collection, we can ** service life under different breaking stresses.
3.Uniform and repeatable.
One of the great advantages of ZERODUR is its excellent 3D uniformity, which is very low not only in terms of low CTE, but also in terms of inclusions, streaks and internal stresses. SCHOTT offers these objects in sizes up to 425 m。
4.Custom shapes.
Zerodur is available in a variety of highly customizable shapes. Advanced grinding and polishing produce sub-nanometer roughness, making it a substrate for high-tech coatings. In addition, weight can be reduced by up to 80% while maintaining mechanical stability.
Some parameters: heat capacity cp [j (g ·k)] at 20 °C 0,90
The modulus of elasticity E [GPA] at 20 °C is averaged at 84,7
Poisson number 0,25
Density g cm3]2,53
Knoop hardness hk 01/20 （iso9385）620
Part of the models: Schott AG fiber optic light source KL 2500 LED
SCHOTT AG fiber optic light source KL 1600 LED
SCHOTT AG fiber optic light source KL 1500 HAL
SCHOTT AG fiber optic light source KL 300 LED
Performance and application of SCHOTT glass-ceramic Zerodur K20