Honeycomb unit for purifying exhaust gas and method for manufacturing honeycomb unit
A honeycomb and honeycomb body technology, which is applied in chemical instruments and methods, catalyst activation/preparation, exhaust devices, etc., can solve the problems of reducing the durability of honeycomb units, and achieve the effect of inhibiting premature damage and inhibiting catalyst shedding.
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no. 1 approach
[0042] Hereinafter, a first embodiment according to the present invention will be described with reference to the drawings. figure 1 It is the figure which looked at the honeycomb unit in this embodiment from the axial direction. refer to figure 1 , the honeycomb unit 1 includes a honeycomb body 10 and an outer cylinder 20 . The outer cylinder 20 is formed in a cylindrical shape, and is disposed at a position surrounding the radially outer surface of the honeycomb body 10 . A heat-resistant alloy can be used for the honeycomb unit 1 . As the heat-resistant alloy, a heat-resistant alloy containing 15 to 25% by mass of Cr and 2 to 8% by mass of Al can be used. For example, Fe-20Cr-5Al alloy, Fe-18Cr-3Al alloy, Fe-20Cr-8Al alloy, etc. can be used. The honeycomb unit 1 can be arranged, for example, in an exhaust gas path of a vehicle. Vehicles include two-wheelers, four-wheelers and off-road vehicles.
[0043] The honeycomb body 10 is formed by winding corrugated foils 30 an...
Embodiment 17
[0099] In Examples 17 to 20 and Comparative Example 7, compared with Example 10, only the width of the edge region from both edge portions of the honeycomb body in the axial direction is different. In Comparative Example 7, since the width of the edge region exceeds 15 mm in the axial direction from both edge portions of the honeycomb body, the evaluation of durability was “×”. On the other hand, in Examples 17 to 20, the edge region width was 15 mm or less in the axial direction from both edge portions of the honeycomb body. Therefore, in Examples 19 and 20, the evaluations of durability and purification performance were "◯". In addition, in Example 18, durability and purification performance were improved, and the evaluation of durability and purification performance was "⊚". This is considered to be because the flat foil-corrugated foil junction overlaps with a part of the through-hole across the edge region and the hole formation region sandwiched by the edge region, so t...
Embodiment 27
[0102] Compared with Example 10, Example 27 is only different in thickness of the flat foil and corrugated foil. In Example 27, as in Example 10, the evaluations of durability and purification performance were "◯".
[0103] Compared with Example 10, Examples 28-32 differ only in the thickness of the brazing material arrange|positioned. In Examples 31 and 32, since the thickness of the brazing material was 0.1 mm or less, the durability was further improved, and the durability evaluation was "⊚". In Examples 28 to 30, since the thickness of the brazing filler metal was set to 0.01 mm or more and 0.5 mm or less, the durability and purification performance were further improved, and the evaluation of durability was "◎◎" and the evaluation of purification performance was "◎ ".
[0104] Compared with Example 10, Examples 33 and 34 differ only in the number of cells per square inch in the honeycomb body. In Examples 33 and 34, as in Example 10, the evaluations of durability and p...
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