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Honeycomb structure

A honeycomb structure and honeycomb technology, applied in gas treatment, separation methods, ceramic products, etc., can solve the problems of honeycomb structure damage, high thermal stress, high thermal expansion, etc., and achieve the effect of preventing shedding and inhibiting the separation of honeycomb units

Active Publication Date: 2021-06-08
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a material expected to have a high heat capacity generally has a characteristic of high thermal expansion, and therefore, high thermal stress may occur due to thermal shock caused by high-temperature exhaust gas, resulting in damage to the honeycomb structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] First, a mixed raw material obtained by mixing silicon carbide (SiC) powder and metal silicon (Si) powder was prepared as a raw material powder for preparing clay for honeycomb unit production. In addition, an appropriate amount of binder, pore-forming material and water are added to the prepared mixed raw materials to prepare plastic clay.

[0119] Next, the obtained clay was molded using an extrusion molding machine to produce 49 quadrangular columnar honeycomb molded bodies. Then, convex portions were formed on each side surface of the 22 formed honeycomb bodies, and concave portions were formed on each side surface of the formed honeycomb body for 21 formed honeycomb bodies.

[0120] Next, the obtained formed honeycomb body was subjected to high-frequency induction heating and drying, and then further dried with a hot air dryer. Next, plugging portions were arranged at the ends of the cells of the dried honeycomb unit molded body so that the openings of the cells w...

Embodiment 2～23

[0140] In Examples 2 to 23, the configuration and arrangement of the honeycomb units were as shown in Table 1 or Table 4, and the configurations of the protrusions and recesses of the honeycomb units were as shown in Table 2 or Table 5 to produce honeycomb structures. The configuration other than those shown in Table 1, Table 2, Table 3, and Table 4 was the same as that of Example 1. For the honeycomb structures of Examples 2 to 23, the same method as in Example 1 was also used to evaluate whether or not the cracks in the joint portion had propagated. The results are shown in Table 3.

[0141] Table 4

[0142]

[0143] table 5

[0144]

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Abstract

The invention provides a honeycomb structure which can effectively inhibit honeycomb unit separation caused by cracks. This honeycomb structure is provided with a honeycomb cell joined body (10) in which a plurality of prismatic honeycomb cells (4) are joined by means of a joining layer (14), and a honeycomb cell (4a) has, on one side surface thereof, a protruding portion (7) provided so as to extend in the axial direction with either a first end surface or a second end surface as a starting point. The other type of honeycomb cell (4b) has, on one side surface thereof, a recessed portion (8) provided so as to extend in the axial direction from either the first end surface or the second end surface, and the honeycomb cell joined body (10) is obtained by joining the honeycomb cells (4a) and the other type of honeycomb cell (4b) with the joining layer (14) therebetween in a state in which the protruding portion (7) of the one type of honeycomb cell (4a) is inserted into the recessed portion (8) of the other type of honeycomb cell (4b).

Description

technical field [0001] The present invention relates to a honeycomb structure. More specifically, it relates to a honeycomb structure used in a filter for trapping particulate matter contained in exhaust gas, a catalyst carrier for supporting a catalyst to purify exhaust gas, and the like. Background technique [0002] Exhaust from diesel vehicles and trucks contains particulate matter. Hereinafter, the particulate matter may be referred to as "PM". PM is the abbreviation of "Particulate Matter". This PM mainly contains carbon fine particles such as soot, and it is necessary to prevent release of the PM into the atmosphere, and strict emission restrictions are proposed. [0003] In response to this strict emission restriction, many studies have been conducted to reduce PM emissions. However, there is a limit to reducing PM emissions by improving combustion technology. Installing a filter in the exhaust system becomes an effective reduction in PM emissions. means. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28F01N3/022
CPCF01N3/2803F01N3/0222B01D46/2478B01D46/2482B01D46/2455B01D46/2476C04B2111/00793C04B35/565C04B2235/606C04B2235/6021B01D46/2466C04B38/0009C04B38/0016C04B38/0074C04B38/0645B01D53/94B01D2255/9155B01D2279/30B01D46/2462B01J35/56
Inventor 石冈知大结城一也
Owner NGK INSULATORS LTD
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