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[March 2002]
Encapsulation of Small High Temperature Ceramic Components
Ceramacast 645N is a new high temperature ceramic casting material developed by Aremco Products Inc (Valley Cottage, NY, USA), for use to encapsulate and insulate high temperature flow meters and pressure and temperature sensors.It is a fused silica based ceramic compound which is said to be ideal for encapsulating small ceramic and metal housings used in a variety of high temperature devices up to 1650°C. Key attributes include excellent bonding to ceramics and metals, ultra low thermal conductivity, high dielectric strength of 300V per mil, high compressive strength of 7,000psi and exceptional chemical resistance, claims Aremco.
It is described as a simple to use compound, provided in a powder form which is mixed in a ratio of 100 parts powder to 15 parts water. The mixture sets at room temperature in less than eight hours, the fully cures at 93°C and 120°C for two to fours, respectively. The shrinkage rate when fired to 535°C is less than 0.3%.
Ceramacast 645N is described as an environmentally friendly product which contains no volatile organic compounds. It can be applied easily by syringe, squeeze bottle or automatic dispensing equipment.
ENDS