This is an example of cofired 92% alumina after singulation.
Alumina
or multi crystalline Al2O3 comes in 3 common forms for dicing.
99.6% alumina is the purest form and the hardest. It is normally
used for thin film microwave circuits operating at high frequencies
because it can be polished to a 1 microinch or better surface
finish. This lets the circuit designer obtain precise values for
thin film resistors such as tantalum nitride (TaN) or nichrome
(NiCr). 99.6% alumina is also useful for capacitor fabrication
because of its dielectric constant ( 9.9).
96% alumina has a higher filler content and consequently is somewhat
easier to cut with a diamond saw. It is normally used for thick
film fired circuits because the thick film pastes do not adhere
as well to purer alumina. The surface is frequently lapped for
circuit applications, but can be polished if required.
92% alumina has even more filler and is useful for packaging applications
where multiple layers of ceramic and conductive layers are built
up. While softer than the previous types of alumina, it can present
challenges for accurate dicing because of the thicker layers and
pattern distortion during firing.
Precision Surface Technology patterns and dices 99.6% alumina
for thin film circuits as well as for capacitor applications.
We singulate and machine 96% alumina into a variety of shapes
and sizes. PST manually aligns each cut on heat distorted 92%
alumina to assure high yields of ceramic packages.
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