Joining Ceramics Technology
Aluminum oxide 1” disc bonded to stainless steel.
Aluminum Nitride 2” disc bonded to aluminum oxide tube.
1/8” sapphire tube bonded to sapphire disc.
Aluminum nitride 13” plate bonded to aluminum nitride pedestal (full area bond, no voids).
Joining of advanced ceramics, to themselves and to other materials, is a fundamental necessity in many applications. Traditional methods of joining ceramics have significant limitations, specifically when requirements for elevated temperature, hermetic, oxidation/corrosion resistant joints are needed. CRC has developed a new methodology for bonding advanced ceramics to themselves and other materials. This patented new methodology provides revolutionary improvements in cost, cycle time, energy usage, and hermeticity in elevated temperature and/or oxidizing/corrosive environments.
CRC’s joining technology utilizes aluminum in a high temperature brazing process to join various ceramics and metals. The resulting bond is serviceable up to 600◦C with excellent oxidation/corrosion resistance. Additionally, materials with significantly different thermal expansion coefficients can also be joined, i.e. alumina and aluminum nitride. CRC has demonstrated successful joining of numerous different materials such as alumina, zirconia, beryllia, doped alumina, aluminum nitride, sapphire, molybdenum, and others. Ceramics which exhibit diffusion with aluminum at joining temperatures (800 – 1200◦C) do not join effectively, i.e. silicon nitride and silicon carbide. CRC has not yet developed a model for predicting applicability of the joining process on new materials, and at this time effective joining potential is determined empirically. Additionally, CRC has developed a bonding solution for higher temperatures (up to 1400◦C) which can be further discussed under NDA.
CRC is currently developing partnerships to apply this new joining technology outside of their core market of semiconductor equipment. Target applications will include requirements to join ceramics to themselves or other materials with requirements for vacuum integrity, oxidation or corrosion resistance, and/or high operating temperatures.
Beryllia 2” disc bonded to beryllia tubing (sectioned).
Quartz 2” disc bonded to quartz tubing.
Aluminum oxide 2” disc bonded to zirconia tube.