Amorphous non-intumescent inorganic fiber mat for low temperature exhaust gas treatment device
AssigneeUnifrax Corporation
InventorJohn D. TenEyck
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Abstract
A non-intumescent mat for providing a support structure for low temperature fragile structures in exhaust gas treatment devices, such as catalytic converters, diesel particulate traps, and like, comprising amorphous inorganic fibers. The fibers have Young's Modulus of less than about 20×106 psi and a geometric mean diameter less than about 5 μm. The mat is adapted to provide a holding force of at least 15 psi throughout an average mat temperature range from ambient temperature up to at least about 350° C. The amorphous inorganic fibers are preferably melt formed fibers comprising the fiberization product of a melt comprising alumina/silica.
Claims42
A non-intumescent mat for providing support for a fragile structure in a low temperature exhaust gas treatment device comprising up to about 1260° C. temperature resistant, amorphous, inorganic fibers, said fibers having a Young's Modulus of less than about 20×106 psi, said mat optionally including a binder, wherein the mat is adapted to provide a holding force of at least 15 psi throughout an average mat temperature range from ambient temperature up to at least about 350° C., and wherein the temperature resistant, amorphous, inorganic fibers are not post processed by heat treating to either anneal or crystallize the fiber.
An exhaust gas treatment device comprising a fragile support structure within a housing, and a support element disposed between the fragile support structure and the housing, wherein said support element comprises a non-intumescent mat comprising up to about 1260° C. temperature resistant, amorphous, inorganic fibers, said fibers having a Young's Modulus of less than about 20×106 psi, and said mat optionally including a binder, wherein the mat is adapted to provide resistance to slippage of the support element in the housing at a force of at least about 60 times the acceleration of gravity throughout an average mat temperature from ambient temperature up to at least about 350° C., and wherein the temperature resistant, amorphous, inorganic fibers are not post processed by heat treating to either anneal or crystallize the fiber.
The exhaust gas treatment device of claim wherein the mat is substantially free of binder.
Dependencies are inferred from the claim text.