초록 ▼

A device for treatment of exhaust gases includes a housing, a fragile structure resiliently mounted within the housing, and a non-intumescent mounting mat disposed in a gap between the housing and the fragile structure. The mounting mat includes a plurality of inorganic fibers that have undergone a

A device for treatment of exhaust gases includes a housing, a fragile structure resiliently mounted within the housing, and a non-intumescent mounting mat disposed in a gap between the housing and the fragile structure. The mounting mat includes a plurality of inorganic fibers that have undergone a surface treatment to increase the holding force performance of the mounting mat. Also disclosed are methods of making a mounting mat for an exhaust gas treatment device and for making an exhaust gas treatment device incorporating the mounting mat.

대표청구항 ▼

1. A mounting mat comprising: heat treated inorganic fibers; anda holding pressure performance increasing surface treatment comprising an inorganic particulate on at least a portion of the exterior surfaces of at least a portion of the inorganic fibers, wherein said mounting mat has a minimum holdin

1. A mounting mat comprising: heat treated inorganic fibers; anda holding pressure performance increasing surface treatment comprising an inorganic particulate on at least a portion of the exterior surfaces of at least a portion of the inorganic fibers, wherein said mounting mat has a minimum holding pressure for holding a fragile structure within a housing of at least one of (i) at least 50 kPa after 1000 cycles of testing at a hot face temperature of 300° C., a gap bulk density of between 0.3 and 0.5 g/cm3, and a percent gap expansion of 2 percent, and (ii) at least 10 kPa after 1000 cycles of testing at a hot face temperature of 900° C., a gap bulk density of between 0.3 and 0.5 g/cm3, and a percent gap expansion of 5 percent. 2. The mounting mat of claim 1, wherein said fibers are selected from alumina, alumino-silicate fibers, alumina/magnesia/silica fibers, calcia/magnesia/silica fibers, magnesia/silica fibers, S-glass fibers, E-glass fibers, quartz fibers, and silica fibers. 3. The mounting mat of claim 2, wherein said mounting mat comprises at least one integral, substantially non-expanding layer of melt-formed, leached glass fibers containing at least 67 percent by weight silica. 4. The mounting mat of claim 3, wherein said mounting mat comprises from about 50 to 100 percent by weight of said leached glass fibers. 5. The mounting mat of claim 4, wherein said mounting mat comprises at least about 80 percent by weight of said leached glass fibers. 6. The mounting mat of claim 3, wherein the mounting mat is substantially free of binder. 7. The mounting mat of claim 3, wherein the leached glass fibers have a diameter greater than about 3.5 microns. 8. The mounting mat of claim 1, wherein said holding pressure performance-increasing surface treatment comprises a coating. 9. The mounting mat of claim 1, wherein said inorganic particulate is selected from the group consisting of dispersions of colloidal alumina, colloidal silica, colloidal zirconia, or mixtures thereof. 10. The mounting mat of claim 9, wherein said inorganic particulate comprises a friction increasing agent.