Composite substrates and their production
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United States of America Patent
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Nov 29, 1994
Grant Date -
N/A
app pub date -
Feb 17, 1993
filing date -
Feb 19, 1992
priority date (Note) -
Expired
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Abstract
A composite substrate is provided, which comprises a cordierite-anorthite-boron base composite material and has a microstructure with anorthite included in the cordierite phase. This substrate can be used in the form of a circuit substrate, because it has high-enough mechanical strength, a coefficient of thermal expansion close to that of silicon and a decreased dielectric constant and, moreover, can be sintered at a low temperature.
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