Catalytic converter having a metallic monolith mounted by a heat-insulating mat of refractory ceramic fibers
AssigneeMinnesota Mining and Manufacturing Company
InventorRoger L. Langer
Life of this patent
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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.
Claims13
A catalytic converter comprising a monolith mounted in a canister by a heat-insulating mat which primarily comprises substantially amorphous melt-formed refractory ceramic fibers that have been annealed under conditons sufficient to provide a Resiliency Value of at least 10 kPa.
A device comprising a housing containing an inner metallic member that is insulated from the housing by a mat heat-insulating of ceramic fibers, which metallic member becomes hot in use and expands to compress the mat between the metallic member and the housing, said device being characterized by the feature that:
- the mat primarily comprises substantiallyu aorphous melt-formed refractory ceramic fibers that have been annealed under conditions sufficient to provide a Resiliency Value of at least 10 kPa.
A catalytic converter comprising a metallic momolith mounted in a canister by a heat-insulating mat which primarily comprises substantially amorphous melt-formed refractory ceramic fibers that have been annealed under conditions sufficient to provide a Resiliency Value of at least 10 kPa.
Dependencies are inferred from the claim text.