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Honeycomb filter
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A filter and honeycomb technology, applied in the field of honeycomb filters, can solve problems such as clogging, and achieve the effect of suppressing cracks on the end face
Active Publication Date: 2017-10-03
NGK INSULATORS LTD
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[0004] In addition, since the DPF will eventually become clogged if the captured PM is not removed, it is necessary to remove the captured PM and regenerate it.
Method used
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Embodiment 1
[0078] As the material of the honeycomb unit, a mixture obtained by mixing SiC powder and metal Si powder at a mass ratio of 80:20 was used. Then, starch and foamed resin were added to the mixture as a pore-forming material, and methylcellulose, hydroxypropylmethylcellulose, a surfactant, and water were added, and plastic clay was prepared by kneading.
[0079] Next, the prepared kneaded clay is extruded, dried, fired, and then oxidized to obtain a prismatic honeycomb unit. In addition, a protective layer is formed on the surface of this prismatic honeycomb unit. Thereafter, predetermined cells of the obtained prismatic honeycomb unit were filled with the slurry for plugging, and dried to obtain a plugged prismatic honeycomb unit.
[0080] It should be noted that the slurry for sealing holes is made of the same material as the clay. The plugging portions are arranged such that one end surface and the other end surface form a checkerboard pattern that complements each other. I...
Embodiment 2～11、 comparative example 1～10
[0099] Except having changed conditions as shown in Table 1, it carried out similarly to Example 1, and obtained the honeycomb filter. Regarding the obtained honeycomb filter, evaluations of "high temperature detection", "end surface crack boundary", "presence or absence of fibrosis of the honeycomb structure part", and "comprehensive judgment" were performed. The results are shown in Table 1.
[0100] In Comparative Example 1 and Comparative Example 4, protective layers were arranged on both the honeycomb structure part and the plugged part by a conventionally known method. Specifically, after extruding the clay, the plugging slurry is filled in the predetermined cells of the dried formed honeycomb body, and then fired, and then oxidized, so that the honeycomb structure and the sealing Protective layers are placed on both sides of the hole.
[0101] In addition, in Example 5, in order to form a thin film also in the plugged portion, the slurry for plugging was filled in the...
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Abstract
The invention discloses a honeycomb filter which includes a honeycomb structure body having porous partition walls (1) defining a plurality of cells (2) which become through channels for fluid, plugging portions (8) disposed in open ends of the cells (2), and a protective layer (30) disposed to cover at least the surface of the honeycomb structure body, each of the honeycomb structure body and the plugging portion (8) has a structure constituted of aggregates made of siliconcarbide and a bonding material which bonds the aggregates to one another, the protective layer (30) is a layer in which silicon is present as much as 40 mass percent or more and oxygen is present as much as 40 mass percent or more and a thickness is 0.5 [mu]m or more, and an outer end face of both end faces of the plugging portion (8) has an exposed region (33) in which the protective layer (30) is not disposed.
Description
technical field [0001] The invention relates to a honeycomb filter. More specifically, it relates to a honeycomb filter capable of detecting a high temperature inside and suppressing the generation of end surface cracks. Background technique [0002] Honeycomb filters made of ceramic honeycomb filters are used in automobiles to collect dust and other particulate matter contained in exhaust gas from automobiles and incinerationexhaust gas generated during waste incineration. In particular, a diesel particulate filter (hereinafter also referred to as "DPF") is used in order to efficiently remove particulate matter such as soot (hereinafter also referred to as "PM") discharged from an internal combustion engine. [0003] As such a diesel particulate filter, there is known a honeycomb filter composed of a joined body in which outer walls of a plurality of honeycomb units are joined with a joint material (for example, refer to Patent Document 1). [0004] Furthermore, since th...
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