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Heat insulating member for end cone portion of exhaust gas conversion apparatus

A waste gas purification device and heat insulation material technology, which is applied in the direction of exhaust device, noise reduction device, scaffolding connection, etc., can solve the problems of poor heat resistance of heat insulation materials, operational problems such as assembly, and durability problems, and achieve resistance to peeling High strength, high heat insulation, and excellent assembly workability

Active Publication Date: 2008-08-13
IBIDEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in terms of high thermal conductivity, the heat insulating materials disclosed in these documents have a problem of poor heat resistance at high temperatures of 850°C or higher.
In addition, these heat insulating materials also have problems in terms of durability against heat exposure due to exhaust gas, wind erosion when assembled to the end cone, and further, it is difficult for these heat insulating materials to be well-fitted to the structure of the end cone when molded, and There are also problems with operability such as assembly

Method used

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  • Heat insulating member for end cone portion of exhaust gas conversion apparatus
  • Heat insulating member for end cone portion of exhaust gas conversion apparatus
  • Heat insulating member for end cone portion of exhaust gas conversion apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (mat: production of laminated sheet)

[0039] In an aqueous alkaline aluminum chloride solution with an aluminum content of 70g / l and Al / Cl=1.8 (atomic ratio), add silica sol to make the composition of the alumina fiber Al 2 o 3 : SiO 2 =72±2:28±2, the precursor of the alumina fiber as the ceramic fiber was obtained. Next, an organic polymer such as polyvinyl alcohol is added to the precursor of the alumina fiber, and the concentrated spinning solution is adjusted, and the continuous sheet of the alumina fiber is produced by the blowing method using the spinning solution, and spun The average fiber length is 60 mm by adjusting the air outlet diameter for spraying. A laminated sheet of alumina fibers is produced by lamination.

[0040] The thus-produced alumina fiber laminated sheet was subjected to needle punching so that the distance between the needle punches was 2 mm, and the needle punch orientation angle A was 0.7. Next, the continuous lamination sheet was hea...

Embodiment 2

[0052] (mat: production of laminated sheet)

[0053] In an aqueous alkaline aluminum chloride solution with an aluminum content of 70g / l and Al / Cl=1.8 (atomic ratio), add silica sol to make the composition of the alumina fiber Al 2 o 3 : SiO 2 =72±2:28±2, the precursor of the alumina fiber as the ceramic fiber was obtained. Next, an organic polymer such as polyvinyl alcohol is added to the precursor of the alumina fiber, a concentrated spinning solution is adjusted, and the spinning solution is used for spinning by the blowing method.

[0054] At this time, the air outlet diameter during blowing was adjusted so that the average fiber length of the alumina fibers was 12 mm, and alumina fibers with an average fiber length of 12 mm were obtained. Lamination is then performed to produce a continuous sheet of alumina fibers to produce a continuous sheet of alumina fibers.

[0055] The thus-produced alumina fiber laminate was needle-punched so that the distance between the needl...

reference example 1

[0067] As in Example 1, wherein, in an aqueous alkaline aluminum chloride solution with an aluminum content of 70 g / l and Al / Cl=1.8 (atomic ratio), silica sol is added so that the composition of the alumina fiber is Al 2 o 3 : SiO 2 =80±2: 20±2 Except that, it carried out similarly to Example 1, and obtained the mat of the alumina fiber.

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Abstract

A heat insulating member for an end cone portion of an exhaust gas conversion apparatus is formed by laminating sheets each made of alumina-silica based ceramic fibers to form a matte and subjecting the matte to needling in a lamination direction of the sheets, in which a composition of the ceramic fiber used in the matte is alumina:silica = 60-80:40-20.

Description

technical field [0001] The present invention relates to a heat insulating material for an end cone portion of an exhaust gas purification device, and more particularly to a heat insulating material used to be assembled in an end cone which is a catalytic converter main body that guides exhaust gas from an exhaust pipe into the exhaust gas purification device The part or the part that discharges the exhaust gas from the exhaust pipe. Background technique [0002] As an end cone e formed by an outer cone 1 and an inner cone 2 (cf. figure 1 ) part of the heat insulation material, the heat insulation material 3 that has been used in the past (refer to figure 2 ) is to be made of alumina (Al 2 o 3 )-Silicon oxide (SiO 2 ) in a composition ratio of 50:50 by laminating sheets of alumina-silica based ceramic fibers. For example, heat insulating materials disclosed in Patent Document 1, Patent Document 2, and the like. However, in terms of high thermal conductivity, the heat i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/28B01D53/34F01N13/14D04H1/4209D04H1/498F01N3/26
CPCF01N3/2853F01N2310/02Y10T442/667Y10T442/684Y10T442/687E04G1/18E04G1/32E04G7/06E04G27/00
Inventor 吉见光哲土本康仁
Owner IBIDEN CO LTD
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