DuraBeryllium windows are composed of high purity beryllium and a thin layer of DuraCoat®.
DuraCoat is a low-Z material that when applied to beryllium creates a hermetic, corrosion resistant window that is used for ultra-high vacuum applications (leak tight is better than 3x10-10 mbar L/sec of helium). DuraBeryllium is resistant to atmospheric moisture, many chemicals, and light abrasion. DuraBeryllium windows can be cleaned using most solvents and is not a health hazard. Moxtek® is capable of attaching and coating beryllium windows as thin as 8 μm.
Features
Benefits
DuraCoat
Corrosion resistance, hermetic seal
DuraCoat Plus
Maximum corrosion resistance
Thin DuraBeryllium
High transmission of low energy x-rays
Uniform Thickness
Constant transmission across entire window
Epoxy adhesive (optional)
Reduced cost
Metal diffusion bond (optional)
High temperature exposure
High purity
Minimal spectral contamination
Temperature Performance Brazed DuraBeryllium windows can withstand temperatures up to 400°C in vacuum or 350°C in air. Adhesive bonded Beryllium and DuraBeryllium windows can be exposed to temperatures above 100 °C at a Differential Pressure of 1 atm on some mount designs.
Transmission Performance DuraCoat is a proprietary refractory coating material, consisting of elements lighter than sodium.
Mounting Two types of bonding are used for mounting Beryllium windows:
DuraBeryllium windows are bonded using vacuum compatible adhesive as shown above. DuraBeryllium windows are sealed into a frame of either stainless steel or nickel-base alloys.
