What is zerodur glass

What is zerodur glass

Zerodur glass is a glass ceramic material developed by Schott GmbH in Germany, which has excellent properties and a wide range of applications. Let's take a look at what zerodur glass is.

In the field of materials science, the expansion or contraction of matter in cold or hot environments is called the coefficient of thermal expansion, abbreviated as CTE. Especially for astronomers, the low thermal expansion coefficient of optical mirror substrates is a very important characteristic. A low thermal expansion coefficient glass material was urgently needed for this, and Schott developed zerodur glass, which is a nearly zero expansion glass ceramic material with an average value of 0 ± 0.007 × 10-6K-1 ° in the temperature range of 0-50 ° C. Other characteristics such as high three-dimensional uniformity, few inclusions, bubbles, and internal stripes, hardness similar to borosilicate glass, good affinity for coatings, low helium permeability, no pores, excellent chemical stability, and fracture toughness of about 0.9 MPa · m 1/2 make it an ideal choice in the field of optics.

Next, let's talk about the physical properties. The optical mirror substrate of astronomical telescopes also has high requirements for physical properties, so the physical properties of Schott zerodur glass are extremely excellent, such as dispersion: (nF − nC)=0.00967, density: 2.53 g/cm3 (25 ° C), Young's modulus: 9.1 × 1010 Pa, Poisson's ratio: 0.24, specific heat capacity at 25 ° C: 0.196 cal/(g · K)=0.82 J/(g · K), thermal expansion coefficient (20 ° C to 300 ° C): 0.05 ± 0.10 × 10 − 6/Kelvin, thermal conductivity: 1.46W/(m · K) at 20 ° C, maximum usage The temperature is 600 ℃ and the impact resistance behavior is almost the same as other glasses.

Based on its characteristics and physical properties, it has a wide range of applications. For example, the main mirrors M1, M2, M3, and M4 of the European Southern Observatory's Extremely Large Telescope use zero degree glass, as well as ring laser gyroscopes for auxiliary aircraft and submarines, and micro lithography technology and integrated circuit printing can be used for precise positioning of wafers and other applications,

Jundro Ceramic's zerodur glass has excellent performance and stability, making it an ideal choice for various high-precision equipment. Through our customized processing services, we ensure the products meet your specific application needs