temperature co-fired ceramics
Updated May 25,
here to go to our co-fired ceramics page
here to go to low-temperature co-fired ceramics (LTCC) page
New for March 2010! This
page was split off of the co-fired
High temperature co-fired ceramics
differ from their low-temperature cousins, because their firing
temperature of greater than 1500C restricts the types of metalizations
that can be co-fired. If gold or silver were co-fired at 1500C,
they would melt and run off the ceramic. Thus only "refractory"
metals are co-fired above 1000C, such as tungsten, manganese, and
molybdenum. These metals all have one thing in common: their resistivity
is high. This means than metal losses in HTCC circuits at high-frequencies
can be severe.
HTCC can easily provide hermeticity,
unlike LTCC. It was used in many module packages, including the
RF/DC feedthroughs on many, many airborne TR
modules. Unfortunately, we can't show you a picture, because
the subject is ITAR restricted.