Publications
Process evaluation of DuPont™ GreenTape™ 9K7 LTCC
GreenTape™ 9K7 low temperature cofired ceramic (LTCC) is a low loss glass ceramic dielectric tape for high frequency applications. The low loss is mainly achieved via glass-derived and glass-reacted crystallizations that occur during the sintering stage. Tins paper reports on the impact of one critical process parameter, the ramp rate from the binder burnout to the sintering temperature (530 - 850°C), which affects the shrinkage behavior, dielectric properties and strip line (SL) resonator characteristics of 9K7. At slow ramp rates crystallization occurs before densification, increasing glass viscosity, and thus inhibiting 9k7 from reaching full density. The sintering of 9k7 can be optimized using ramp rates that allow densification prior to crystallization. © Copyright Honeywell Federal Manufacturing & Technologies LLC, 2011.