Catalytic converter having a metallic monolith mounted by a heat-insulating mat of refractory ceramic fibers
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United States of America Patent
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Oct 5, 1993
Grant Date -
N/A
app pub date -
May 21, 1992
filing date -
May 21, 1992
priority date (Note) -
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Abstract
A catalytic converter has a metallic monolith that is mounted in a canister by a heat-insulating mat of melt-formed refractory ceramic fibers that have been annealed to provide a Resiliency Value of at least 10 kPa. A mat having such Resiliency Value does not take a compression set that would allow the monolith to become loose. The ceramic fibers preferably are melt-formed from a mixture of about equal parts by weight of Al.sub.2 O.sub.3 and SiO.sub.2. After being annealed, the ceramic fibers can have a fine-grained crystalline structure, but significant energy savings can be realized by reducing the annealing temperatures and times such that the fibers have an amorphous structure while still attaining excellent Resiliency Values.
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