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China Sapphire Window Suppliers
Single crystal sapphire is a high purity, optically clear form of aluminum oxide (Al2O3) that can be used in many harsh environments. In applications where sapphire needs to be bonded to metal, epoxy or other gluing methods can be used, but brazing is usually a much better option. Unlike gluing, brazing creates a hermetic, high-temperature seal – ideal for harsh or vacuum applications. Due to its purity, bare sapphire will not attach to braze or solder alloys on its own, so an intermediary metal, usually molybdenum/manganese (Mo/Mn), is needed. Our Mo/Mn matrix is specifically made for brazing sapphire and will create a bond that can withstand extreme temperatures (-40°C to 800°C) and provide a hermetic seal down to 10-9 torr.l/sec. Precision metallizes and electroplates sapphire windows to prepare them for hermetic brazing into a metal housing. The thick film metallization is applied using various methods including brush, spray, screen printing or our dual station robot. In order to preserve the optical properties of the Window, we typically only metalize and braze the outer diameter of the part.