JP2019163760A5 - - Google Patents

Description

Here, FIG. 2 is a plan view of the fluid heating component 1 as viewed from above. Further, the conductive film layer 4 overlaid on the outer peripheral surface 3 does not necessarily have to be applied over the entire outer peripheral surface 3 of the honeycomb structure 2, and is ring-shaped (at least a part of the outer peripheral surface 3). It suffices as long as it exhibits an annular shape and is electrically connected (details will be described later).

When the honeycomb structure 40 is used as a catalyst carrier for automobiles or an exhaust gas purification filter, a predetermined ceramic may be used as a main component and the porosity may be 30 to 60%. If the porosity is less than 30%, the catalyst cannot be supported efficiently and the function as a filter is deteriorated, which is not preferable. Further, if it is the porosity of more than 60%, the strength is not sufficient, unfavorably the durability is lowered.

2. Integrally constructed fluid heating component composite body 30a by combining a plurality of flow bodies heating element of the present invention configured as a fluid heating element complexes above, it is possible to form a 30b. Here, FIG. 7 is an exploded perspective view showing a state before construction of the fluid heating component composite 30a, FIG. 8 is a perspective view showing a schematic configuration after construction of the fluid heating component composite 30a, and FIG. 9 is a perspective view showing a schematic configuration after construction. FIG. 10 is an exploded perspective view showing a state before construction of the fluid heating component composite 30b having another example configuration, and FIG. 10 is a perspective view showing a schematic configuration after construction of the fluid heating component composite 30b of FIG.

(1) Honeycomb structure A honeycomb structure containing SiC as a main component was manufactured. First, a molding raw material obtained by kneading SiC powder, a binder, water, an organic solvent, etc. adjusted to a predetermined particle size and blending amount is extruded into a desired shape and dried to obtain a honeycomb molded product, and then appropriately. After processing, Si impregnation firing was performed at a high temperature to obtain a honeycomb structure. Here, as the honeycomb structure, a honeycomb structure having a honeycomb diameter of 43 mm and a honeycomb length in the axial direction of 23 mm was used. Here, by changing the impregnation ratio of the Si impregnation firing, the porosity of the honeycomb structure was adjusted to 10% or less in Example 1. Similarly, in Examples 2 to 6 and Comparative Examples 1 and 2, the porosity of the honeycomb structure was adjusted to 5% or less, and in Example 12, the porosity of the honeycomb structure was 10% or more. .. For Examples 7 to 12 , fired ones were prepared under the same conditions as the honeycomb structures of Examples 1 to 6, and the outer peripheral wall was ground so that the honeycomb diameter was 40 mm. A honeycomb structure with a thinner outer wall was prepared. The outer peripheral wall thickness was measured at a total of 16 points using a measuring microscope, and the average value was taken as the outer peripheral wall thickness. That is, except for Example 12, the honeycomb structure (columnar member) that is the base of the fluid heating component is dense.

In the flow body heating components of Examples 1 to 6, for the metal type and method for forming a conductive film layer formed on the outer peripheral surface of the honeycomb structure, it is not observed particularly great significance, the present invention It was confirmed that good results were obtained within the specified range. Further, it was confirmed that good results are obtained in the flow body heating elements of thin Example 7-12 of the outer peripheral wall, as compared with Example 1-6, heated without causing cracks even in a larger heating rate Was confirmed to be possible.

On the other hand, no Fluid heating element a conductive coating layer (Comparative Example 1), and, at the cut face of the honeycomb structure perpendicular to the flow direction of the fluid, the cutting face of the honeycomb structure in a state of electrically connected all flow body heating elements have not be set in the circumferential (Comparative example 2) are both slow heating rate, elapsed time is 100s or is required (Comparative examples to reach 300 ° C. from the start of heating by induction heating test It was shown that 1) or 115 s passed and finally reached 100 ° C. (Comparative Example 2), and rapid heating and temperature rise were not possible. Therefore, it was confirmed that it is difficult to adopt it in a heating system for improving fuel efficiency.

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