High temperature mat for a polltion control device

A technology of pollution control and pollution control components, which is applied in the field of installation materials and high-temperature gaskets, and can solve the problems of high economic cost and low fiber density

Inactive Publication Date: 2003-11-26
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fibers made by the sol-gel process are generally low in density and require additional processing to provide mats suitable for direct use in pollution control devices
In addition, the economic cost of implementing the sol-gel method can be high compared to other conventional fiber manufacturing methods

Method used

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  • High temperature mat for a polltion control device
  • High temperature mat for a polltion control device
  • High temperature mat for a polltion control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3 and C1-C6

[0062] Table 2

[0063] * Kaowool available from Thermal Ceramics TM HA

[0064] ** Saffil purchased from ICI TM 0BM

[0065] *** Fiberfrax from Unifrax TM 7000M

[0066] The data in Table 1 shows that the liner of the present invention exhibits less shrinkage and excellent RCFT test pressure retention.

[0067] table 3

[0068] The data in Table 3 show that the gaskets of the present invention resist cold abrasion better than gaskets made from amorphous annealed fibers alone. Although Example C5 had comparable abrasion resistance, it required an unsuitable lamination step prior to end use.

Embodiment 4-6

[0070] The liners of Examples 1-3 and intumescent material liners such as Interam® available from 3M Company TM The Type 100 pads were combined to produce a two layer pad with an intumescent layer and a non-intumescent layer in each layer. These two layers of gaskets are installed between the monolith and the metal casing, with the layer of non-intumescent material against the monolith and the layer of intumescent material against the casing, to make a catalytic converter. Alternatively, the intumescent layer can also be installed against the whole piece.

[0071] In Example 7, an intumescent material was combined with the ceramic-based polycrystalline fiber and the annealed fiber of Example 1. Specifically, unexpanded vermiculite was added to the fiber of Example 1, and its addition accounted for 30% by weight of the material. The density of the made pad is 0.1-0.7 g / cm 3 .

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Abstract

A high temperature mat (16) for a pollution control device (10). The high temperature mat is generally utilized in pollution control devices (10) such as catalytic converters (14) and diesel particulate filters. The mat (16) includes a mixture of polycrystalline fibers and annealed ceramic fibers. The polycrystalline fibers are generally sol-gel formed fibers that do not contain any ceramic particulate matter. The other ceramic fiber component of the present invention is an annealed ceramic fiber. The combination of the noted fibers results in a high temperature mat (16) having desirable resiliency value and good erosion resistance at high temperatures and normal mounting pressures. The high temperature mat is suitable for use as an insulating layer in an end cone of a pollution control device (10) or for wrapping a pollution control element (14) and securing the wrapped element within the pollution control device (10).

Description

[0001] The present invention relates to installation materials for pollution control devices, in particular to sheets of installation material suitable as high temperature insulation in pollution control devices, and more particularly to sheets of installation material comprising a mixture of polycrystalline fibers and annealed ceramic fibers. Background technique [0002] Pollution control devices are used in automobiles to control air pollution. Catalytic converters and diesel particulate filters are two types of pollution control devices that are widely used today. Both devices generally comprise a pollution control element, or monolithic member, contained within a metal housing with a mounting material interposed between the monolithic member and the walls of the housing. The monolithic structure, ie monolith, is made of metal or generally ceramic material. In the catalytic converter, the whole piece carries a catalyst that can promote the oxidation of carbon monoxide and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/02B01D39/14B01D39/20B01D53/86B01D53/88B01D53/94B01J33/00C04B35/80D04H1/4209D04H1/488F01N3/28F01N13/18
CPCB01D53/885D04H1/488F01N2470/06F01N3/2857B32B5/26F01N13/1888D21H13/38D04H1/4209B32B5/08F01N3/2864B01D53/94B01D53/86F01N3/28
Inventor R·L·兰格
Owner 3M INNOVATIVE PROPERTIES CO
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