Welcome to China Hard Materials Parts. Thank you for visiting!
Since 1947, we have been a precision machining and polishing fabricator of parts from all technical ceramics, sapphire, glass and quartz. We machine these materials to very precise tolerances (many times measured in millionths of an inch) for dimension, flatness, wedge and roundness or cylindricity. Our customers typically have a critical application that requires extremely tight tolerances in ultra-hard materials. We also have the capability to grind and polish spherical radius parts in a variety of hard materials, both inside and outside diameters, to optical requirements.
Please feel free to navigate to other pages within our site to see more information on all of our high precision machining services, materials and capabilities. If you would like more information please click here to send a request, or visit our Frequently Asked Questions page.
Zerodur(R) is a glass ceramic with an extremely low thermal expansion coefficient.
Zerodur is a glass ceramic made by Schott Glass that is designed and formulated to exhibit essentially zero thermal expansion over a wide temperature range. This remarkable property is useful where precision parts will face wide thermal conditions in application. An ideal application is as a mirror substrate for astronomical telescopes or ring laser gyroscopes, as well as spacers for some laser assemblies.
Zerodur is an inorganic, nonporous lithium aluminum silicon oxide glass ceramic. It is transparent, but with an amber color. Precision parts are machined using a diamond grinding process and parts can then be optically polished as necessary using chemo-mechanical methods.
China Hard Materials Parts has many years’ experience fabricating precision parts from this material to exacting customer requirements. The material is readily available in slab form, but can be specified from Schott in large sizes weighing many tons. Since Zerodur is a proprietary material, where absolute material properties are critical to the application, it is best to contact the producer’s website directly to understand availability.
Production is a complicated process requiring melting, casting, annealing, and controlled volume crystallization. For smaller precision parts, China Hard Materials Parts is able to source commercial material in its best form and then fabricate it to customer requirements. We are also willing and able to fabricate from customer supplied material if preferred.
Other Glass Ceramics :
Macor(R)
Corning ULE(R)
*Click on a Property to see a comparison of up to 10 materials
