JP2003001029A - Porous ceramic honeycomb filter - Google Patents
Porous ceramic honeycomb filterInfo
- Publication number
- JP2003001029A JP2003001029A JP2001184060A JP2001184060A JP2003001029A JP 2003001029 A JP2003001029 A JP 2003001029A JP 2001184060 A JP2001184060 A JP 2001184060A JP 2001184060 A JP2001184060 A JP 2001184060A JP 2003001029 A JP2003001029 A JP 2003001029A
- Authority
- JP
- Japan
- Prior art keywords
- honeycomb filter
- porous ceramic
- ceramic honeycomb
- porosity
- cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ディーゼルエンジ
ンなどの排気ガス中に含まれる微粒子を捕集する多孔質
セラミックハニカムフィルタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous ceramic honeycomb filter which collects fine particles contained in exhaust gas of a diesel engine or the like.
【０００２】[0002]
【従来技術】地域環境や地球環境の保全面から、自動車
などのエンジンから排出される排気ガスに含まれる有害
物質の削減が求められている。特にディーゼルエンジン
などの排気ガス中に含まれる微粒子を捕集するため、多
孔質セラミックハニカムフィルタ（以下、「多孔質セラ
ミックハニカムフィルタ」を略して「ハニカムフィル
タ」という）が注目され、実用されるようになってき
た。2. Description of the Related Art From the viewpoint of protecting the local environment and the global environment, it is required to reduce harmful substances contained in exhaust gas emitted from engines such as automobiles. In particular, a porous ceramic honeycomb filter (hereinafter, abbreviated as "honeycomb filter" for short) will be attracting attention and put to practical use in order to collect fine particles contained in exhaust gas from diesel engines and the like. Has become.
【０００３】図１はハニカムフィルタ１０の斜視図であ
り、図２は、図１のハニカムフィルタ１０の模式断面図
である。図１及び図２に示すように、通常、ハニカムフ
ィルタ１０は、略円筒状で、外周壁１１ａと、この外周
壁１１ａの内周側でセル壁１１ｂにより囲まれた多数の
セル１１ｃを有する多孔質セラミックハニカム構造体
（以下、「多孔質セラミックハニカム構造体」を略して
「ハニカム構造体」という）１１でのセル１１ｃの流入
側１１ｄ、流出側１１ｅの両端面を交互に目封じ材１２
ａ、１２ｂで目封じしている。そして、ハニカムフィル
タ１０は、金属容器（図示せず）内で圧縮状態として介
挿されたセラミック繊維マットなどの把持部材の面圧で
金属容器に収納されている。FIG. 1 is a perspective view of the honeycomb filter 10, and FIG. 2 is a schematic sectional view of the honeycomb filter 10 of FIG. As shown in FIGS. 1 and 2, the honeycomb filter 10 is usually substantially cylindrical and has a porous structure having an outer peripheral wall 11a and a large number of cells 11c surrounded by cell walls 11b on the inner peripheral side of the outer peripheral wall 11a. In the porous ceramic honeycomb structure (hereinafter, "porous ceramic honeycomb structure" is abbreviated as "honeycomb structure") 11, the inflow side 11d and the outflow side 11e of the cells 11c are alternately sealed at both end faces.
It is sealed with a and 12b. Then, the honeycomb filter 10 is housed in the metal container under the surface pressure of a holding member such as a ceramic fiber mat inserted in a compressed state in the metal container (not shown).
【０００４】ハニカムフィルタ１０での排気ガス浄化
は、以下の通り行われる。図２で、排気ガスは、ハニカ
ムフィルタ１０の流入側１１ｄで開口しているセル１１
ｃから流入（１０ａで示す）し、セル壁１１ｂに形成さ
れた細孔（図示せず）から隣接セルに流れ、流出側１１
ｅから排出（１０ｂで示す）する。そして、排気ガス中
に含まれる微粒子などは、セル壁１１ｂ内で連続する細
孔から隣接セルに通過する際に濾過され、捕集される。
そして、捕集された微粒子が一定量以上になると、電気
ヒーターやバーナ等で燃焼除去されハニカムフィルタ１
０の再生が行われる。Exhaust gas purification by the honeycomb filter 10 is performed as follows. In FIG. 2, the exhaust gas is discharged through the cells 11 that are open on the inflow side 11d of the honeycomb filter 10.
Inflow (indicated by 10a) from c, flow into adjacent cells from pores (not shown) formed in the cell wall 11b, and outflow side 11
Eject from e (indicated by 10b). Then, the fine particles contained in the exhaust gas are filtered and collected when passing through the continuous pores in the cell wall 11b to the adjacent cells.
When the collected fine particles reach a certain amount or more, they are burned and removed by an electric heater, a burner or the like, and the honeycomb filter 1
Playback of 0 is performed.
【０００５】また、ハニカムフィルタ１０のセル壁１１
ｂやセル壁１１ｂに形成した細孔(図示せず)に白金属金
属触媒などの触媒を担持することにより、微粒子の燃焼
温度を下げ、捕集した微粒子を連続的に燃焼させる方法
もある。さて、ハニカムフィルタ１０には、微粒子の捕
集効率が高いことと、圧力損失が低いことが要求され
る。微粒子の捕集効率が高く、圧力損失が低ければ、微
粒子の蓄積に伴うエンジンへの背圧増加が遅くなって、
捕集を継続できる時間が長くなり、再生までのインター
バルも長くなる。しかし、一般的に捕集効率と圧力損失
は反比例の関係にあり、捕集効率を高くしようとすると
圧力損失が増大し、一方、圧力損失を低くしようとする
と捕集効率が悪化するようになる。従来、捕集効率と圧
力損失が両立できるよう、ハニカムフィルタのセル壁の
気孔率や平均細孔径を調整していたが限界があった。特
に、担持した触媒で微粒子を連続的に燃焼させる場合、
担体として活性アルミナ等の高比表面積材料をセル壁の
細孔内部にコーティングする必要があることから、高比
表面積材料がセル壁の細孔を閉塞してしまい、コーティ
ングしていないフィルタに比べ圧力損失が高くなって、
高捕集効率で低圧力損失のフィルタを得ることは困難で
あった。Further, the cell wall 11 of the honeycomb filter 10
There is also a method in which a catalyst such as a white metal metal catalyst is supported on pores (not shown) formed in b or the cell wall 11b to lower the combustion temperature of fine particles and continuously burn the collected fine particles. Now, the honeycomb filter 10 is required to have a high particulate collection efficiency and a low pressure loss. If the collection efficiency of fine particles is high and the pressure loss is low, the increase in back pressure to the engine due to the accumulation of fine particles will slow down,
The time for which collection can be continued becomes longer, and the interval before regeneration also becomes longer. However, in general, the collection efficiency and the pressure loss are in inverse proportion to each other. When the collection efficiency is increased, the pressure loss increases, while when the pressure loss is decreased, the collection efficiency deteriorates. . Conventionally, the porosity and the average pore diameter of the cell walls of the honeycomb filter have been adjusted so as to achieve both the collection efficiency and the pressure loss, but there is a limit. In particular, when fine particles are continuously burned with a supported catalyst,
Since a high specific surface area material such as activated alumina needs to be coated inside the pores of the cell wall as a carrier, the high specific surface area material clogs the pores of the cell wall, resulting in a higher pressure than an uncoated filter. The higher the loss,
It was difficult to obtain a filter with high collection efficiency and low pressure loss.
【０００６】上記問題点を解決するため、特開平７−１
６３８２３号公報には、セル壁の気孔率を４５％以上６
０％以下とすることに加えて、その表面から内部に向か
って開口および貫通する全細孔の比表面積Ｍ（ｍ2／
ｇ）と、そのフィルタ表面における表面粗さＮ（μｍ）
との関係を１０００Ｍ＋８５Ｎ≧５３０の範囲とするこ
とで、フィルタ面積とフィルタ表面から内部に連鎖して
貫通した細孔の数を増加させ、捕集時間が長く、再生回
数を少なくできるようにしたハニカムフィルタが開示さ
れている。In order to solve the above problems, Japanese Patent Laid-Open No. 7-1
No. 63823 discloses that the porosity of the cell wall is 45% or more.
In addition to not more than 0%, the specific surface area M (m 2 /
g) and the surface roughness N (μm) on the filter surface
By setting the relationship between and to be in the range of 1000M + 85N ≧ 530, the filter area and the number of pores penetrating from the filter surface to the inside are increased, and the collection time is long and the number of times of regeneration can be reduced. A filter is disclosed.
【０００７】また、特開平８−９３１号公報には、気孔
率を４０％以上５５％以下、平均細孔径を５μｍ以上５
０μｍ以下とすることに加えて、Ｖａｌｌｅｙ Ｌｅｖ
ｅｌなる値を２０％以下とすることで、ハニカムフィル
タ表面に捕集された微粒子の剥離性が良くなり、逆洗エ
アによる再生効率を良くしようとしたハニカムフィルタ
が開示されている。ここで、Ｖａｌｌｅｙ Ｌｅｖｅｌ
とは、触針式表面粗さ計によりフィルタ表面の粗さの
データを３次元解析して、ある面に対してフィルタの凸
部の体積と凹部の体積とが等しくなるような面を平均面
とし、この平均面でフィルタを切断したと仮定したと
き、平均面における細孔面積の和の全表面積に対する比
率と定義している。Further, in JP-A-8-931, the porosity is 40% or more and 55% or less, and the average pore diameter is 5 μm or more and 5% or less.
In addition to having a thickness of 0 μm or less, Valley Lev
There has been disclosed a honeycomb filter in which the value of el is 20% or less improves the releasability of fine particles collected on the surface of the honeycomb filter and improves the regeneration efficiency by backwashing air. Where, Valley Level
Is a three-dimensional analysis of the roughness data of the filter surface with a stylus surface roughness meter, and the surface where the volume of the convex portion and the volume of the concave portion of the filter are equal to a certain surface It is defined as the ratio of the sum of the pore areas on the average surface to the total surface area, assuming that the filter is cut on this average surface.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、前記特
開平７−１６３８２３号公報に開示のハニカムフィルタ
は、表面粗さが、同公報の表２に記載のとおり、実施例
で２．３〜７．４μｍ、比較例で３．１〜７．４μｍ程
度であるため、セル壁の捕集面積を大きくする効果は得
られず、実質的に微粒子の捕集効率も低いという問題が
あった。このため、圧力損失が低く、しかも微粒子の捕
集効率が高いフィルタを得ることは困難であった。However, the honeycomb filter disclosed in Japanese Patent Laid-Open No. 163823/1995 has a surface roughness of 2.3 to 7. Since it was 4 μm and about 3.1 to 7.4 μm in the comparative example, there was a problem that the effect of increasing the collecting area of the cell wall was not obtained and the efficiency of collecting fine particles was substantially low. Therefore, it is difficult to obtain a filter having a low pressure loss and a high particulate collection efficiency.
【０００９】また、前記特開平８−９３１号公報に開示
のハニカムフィルタは、気孔率が４０％以上５５％以下
であり、圧力損失が増加し易いという問題があった。ま
た、Ｖａｌｌｅｙ Ｌｅｖｅｌ なる値を２０％以下と
することで表面に捕集された微粒子の剥離性が良くなる
ものの、排気ガス中の微粒子をセル壁で捕集する効果が
少ないという問題もあった。なお、特開平８−９３１号
公報には、表面粗さの値に関して具体的な記載は見当た
らない。Further, the honeycomb filter disclosed in JP-A-8-931 has a problem that the porosity is 40% or more and 55% or less and the pressure loss tends to increase. Further, when the value of Valley Level is set to 20% or less, the fine particles collected on the surface can be easily peeled off, but there is also a problem that the effect of collecting the fine particles in the exhaust gas on the cell wall is small. Incidentally, in JP-A-8-931, there is no specific description regarding the value of the surface roughness.
【００１０】本発明は、上記課題に鑑みてなされたもの
で、セル壁の気孔率を大きくして圧力損失を低く抑える
と共に、排気ガス中の微粒子の捕集効率が高いハニカム
フィルタを得ることにある。The present invention has been made in view of the above problems, and an object of the present invention is to obtain a honeycomb filter in which the porosity of the cell walls is increased to suppress the pressure loss and the collection efficiency of fine particles in the exhaust gas is high. is there.
【００１１】[0011]
【課題を解決するための手段】本発明者らは、ハニカム
フィルタでの気孔率、平均細孔径を特定し、かつセル壁
の表面粗さ（最大高さＲｙ）を所定値以上に大きくする
ことで、上記課題が解決できるとの知見を得、本発明に
想到した。The present inventors have specified the porosity and average pore diameter in a honeycomb filter, and have made the surface roughness (maximum height Ry) of the cell wall larger than a predetermined value. Then, the inventors have obtained the knowledge that the above problems can be solved, and arrived at the present invention.
【００１２】即ち、本発明のハニカムフィルタは、外周
壁と、この外周壁の内周側でセル壁により囲まれた多数
のセルを有するハニカム構造体のセルの片端面を目封じ
して、排気ガスを前記セル壁の細孔を通過させて隣接セ
ルに流し、排気ガスに含まれる微粒子を前記セル壁で捕
集するハニカムフィルタであって、前記セル壁の気孔率
が５５〜７５％、平均細孔径が１０〜４０μｍ、表面粗
さ（最大高さＲｙ）が１０μｍ以上であることを特徴と
する。That is, in the honeycomb filter of the present invention, one end surface of a cell of a honeycomb structure having an outer peripheral wall and a large number of cells surrounded by the cell walls on the inner peripheral side of the outer peripheral wall is plugged and exhausted. A honeycomb filter in which a gas is allowed to pass through the pores of the cell wall to flow into an adjacent cell, and the fine particles contained in the exhaust gas are collected by the cell wall, wherein the porosity of the cell wall is 55 to 75%, and the average. The pore size is 10 to 40 μm, and the surface roughness (maximum height Ry) is 10 μm or more.
【００１３】ここで、セル壁の気孔率を５５〜７５％と
したのは、気孔率が５５％未満であると、圧力損失が大
きくなり、気孔率が７５％を超えると、微粒子の捕集効
率が低下し、また、強度も低下するため、微粒子捕集用
フィルタとしては適さないからである。気孔率のより好
ましい範囲は６０〜７０％である。Here, the porosity of the cell wall is set to 55 to 75% because when the porosity is less than 55%, the pressure loss increases, and when the porosity exceeds 75%, the fine particles are collected. This is because the efficiency is lowered and the strength is also lowered, so that it is not suitable as a filter for collecting fine particles. A more preferable range of porosity is 60 to 70%.
【００１４】また、セル壁の平均細孔径を１０〜４０μ
ｍとしたのは、平均細孔径が１０μｍ未満であると、圧
力損失が大きくなり、平均細孔径が４０μｍを超える
と、微細な微粒子がセル壁を透過して捕集効率が低下
し、また強度も低下するため、微粒子捕集用フィルタと
しては適さないからである。なお、気孔率及び平均細孔
径は、水銀圧入式ポロシメータを用いて測定する。The average pore diameter of the cell wall is 10 to 40 μm.
When the average pore diameter is less than 10 μm, the pressure loss becomes large, and when the average pore diameter exceeds 40 μm, fine particles permeate through the cell wall to reduce the collection efficiency and the strength. Is also not suitable as a filter for collecting particulates. The porosity and average pore diameter are measured using a mercury porosimeter.
【００１５】また、セル壁の表面粗さ（最大高さＲｙ）
を１０μｍ以上としたのは、気孔率を５５〜７５％、平
均細孔径を１０〜４０μｍと圧力損失が低く抑えられる
よう設定しているにもかかわらず、セル壁表面に形成さ
れた凸凹部により微粒子を効率よく捕集することが可能
となるからである。セル壁の表面粗さ（最大高さＲｙ）
が１０μｍ未満では、排気ガス中の微粒子をセル壁で捕
集する効果が少なく、微粒子捕集用フィルタとしては適
さない。なお、セル壁の表面粗さ（最大高さＲｙ）のよ
り好ましい範囲は、２０〜１００μｍである。The surface roughness of the cell wall (maximum height Ry)
Was set to 10 μm or more because the porosity is set to 55 to 75% and the average pore diameter is set to 10 to 40 μm so that the pressure loss can be suppressed to a low level. This is because it becomes possible to efficiently collect the fine particles. Surface roughness of cell wall (maximum height Ry)
Is less than 10 μm, the effect of collecting fine particles in the exhaust gas by the cell wall is small and it is not suitable as a filter for collecting fine particles. A more preferable range of the surface roughness (maximum height Ry) of the cell wall is 20 to 100 μm.
【００１６】そして、セル壁を構成するセラミックスの
主結晶はコージェライトであることが好ましい。セル壁
を構成するセラミックスの主結晶がコージェライトであ
ると、微粒子捕集用フィルタとして十分な耐熱性、耐熱
衝撃性、機械的強度が得られるからであるが、本発明は
これに限定されるものではなく、その他の耐熱性セラミ
ックス、例えば、ムライト、アルミナ、窒化珪素、炭化
珪素、窒化アルミ、リチウムアルミニウムシリケート、
チタン酸アルミニウム、ジルコニア、等の材料を使用す
ることができる。The main crystal of the ceramic constituting the cell wall is preferably cordierite. This is because when the main crystal of the ceramics constituting the cell wall is cordierite, sufficient heat resistance, thermal shock resistance, and mechanical strength can be obtained as a fine particle collection filter, but the present invention is not limited to this. However, other heat-resistant ceramics such as mullite, alumina, silicon nitride, silicon carbide, aluminum nitride, lithium aluminum silicate,
Materials such as aluminum titanate and zirconia can be used.
【００１７】[0017]
【発明の実施の形態】以下、発明の実施の形態を詳細に
説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below.
【００１８】図１乃至図２に示すハニカムフィルタ１０
を以下のようにして作製した。
（基本原料粉末の調整）カオリン、タルク、シリカ、水
酸化アルミ、アルミナなどの粉末を計量して、化学組成
が質量比で、ＳｉＯ2：４７〜５３％、Ａｌ2Ｏ3：３２
〜３８％、ＭｇＯ：１２〜１６％となるようにセラミッ
クス原料粉末を調整した。The honeycomb filter 10 shown in FIGS. 1 and 2.
Was prepared as follows. (Preparation of Basic Raw Material Powder) Powders of kaolin, talc, silica, aluminum hydroxide, alumina, etc. are weighed and the chemical composition is a mass ratio of SiO 2 : 47 to 53%, Al 2 O 3 : 32.
The ceramic raw material powder was adjusted so as to be ˜38% and MgO: 12 to 16%.
【００１９】（ハニカム構造体用の坏土調整）セラミッ
クス原料粉末に対し、成形助剤としてメチルセルロース
等のバインダ及び潤滑剤、造孔剤として、グラファイ
ト、小麦粉、でん粉、樹脂粉、発泡剤などの量を変えて
添加し、乾式で十分混合した。次いで、規定量の水を注
入して更に十分な混合を行い、後述する成形及び焼成
後、ハニカム構造体の各種の気孔率、平均細孔径及び表
面粗さ（最大高さＲｙ）が得られるよう坏土を作製し
た。(Preparation of Kneaded Clay for Honeycomb Structure) Amount of binder and lubricant such as methyl cellulose as a molding aid, graphite, wheat flour, starch, resin powder, foaming agent, etc. as a pore forming agent for the ceramic raw material powder Was added and mixed thoroughly by dry method. Next, a prescribed amount of water is injected to perform further sufficient mixing, and after the molding and firing described later, various porosities, average pore diameters and surface roughness (maximum height Ry) of the honeycomb structure can be obtained. A kneaded clay was prepared.
【００２０】（押出成形）次に、坏土を一般的な構造の
押出成形用金型を用いて押出成形し、セル壁で囲まれる
断面が四角形状のハニカム構造を有する成形体を作製し
た。(Extrusion Molding) Next, the kneaded material was extruded using an extrusion molding die having a general structure to produce a molded body having a honeycomb structure having a quadrangular cross section surrounded by cell walls.
【００２１】（焼成）ハニカム構造を有する成形体を、
バッチ式焼成炉を用いて焼成を行い、外周壁１１ａの外
径が１５０ｍｍ、長さが１５０ｍｍ、セル壁厚が０.４
３ｍｍ、１ｃｍ２当たりのセル数が１６個で、各種の気
孔率、平均細孔径、セル壁の表面粗さ（最大高さＲｙ）
を有するコージェライト質セラミックスからなるハニカ
ム構造焼成体を得た。(Baking) A molded body having a honeycomb structure is
Firing is performed using a batch type firing furnace, and the outer peripheral wall 11a has an outer diameter of 150 mm, a length of 150 mm, and a cell wall thickness of 0.4.
The number of cells per 3 mm, 1 cm 2 is 16, various porosities, average pore diameters, cell wall surface roughness (maximum height Ry)
A honeycomb structure fired body made of cordierite ceramics having
【００２２】（目封じ）次に、ハニカム構造を有する焼
成体の両端面にマスキングフィルムを接着剤で貼り付け
た後、市松模様となるように穿孔し、端部に市松模様の
目封じ材を導入し、目封止部を形成し、ハニカムフィル
タ１０を得た。(Sealing) Next, after attaching a masking film to both end surfaces of the fired body having a honeycomb structure with an adhesive, perforation is performed so as to form a checkered pattern, and a checkered plugging material is provided at the ends. Then, the plugged portion was formed and the honeycomb filter 10 was obtained.
【００２３】（気孔率、平均細孔径、表面粗さ（最大高
さＲｙ）の測定）得られたハニカムフィルタ１０から試
料を切り出し、セル壁の気孔率（％）、平均細孔径（μ
ｍ）、表面粗さ（最大高さＲｙ）を測定した。なお、セ
ル壁の気孔率（％）及び平均細孔径（μｍ）は、Ｍｉｃ
ｒｏｍｅｒｉｔｉｃｓ社製オートポアIII９４１０を用
い水銀圧入法で測定した。また、表面粗さ（最大高さＲ
ｙ）は、（ＪＩＳ）Ｂ ０６０１−１９９４に準して数
箇所測定した。(Measurement of Porosity, Average Pore Diameter, Surface Roughness (Maximum Height Ry)) A sample was cut out from the obtained honeycomb filter 10 and the cell wall porosity (%) and average pore diameter (μ) were measured.
m) and surface roughness (maximum height Ry) were measured. The porosity (%) and average pore diameter (μm) of the cell wall are Mic
It was measured by mercury porosimetry using Autopore III 9410 manufactured by Romanitics. Also, the surface roughness (maximum height R
y) was measured at several points according to (JIS) B 0601-1994.
【００２４】（捕集率及び圧力損失の測定）ハニカムフ
ィルタ１０に粒径０．０４２μｍのカーボン粉を３ｇ／
ｈで２時間投入した後の（ａ）捕集率（％）［（投入量
−排出量）／（投入量）］と、流入側１１ｄと流出側１
１ｅの差圧を測定した。そして差圧を（ｂ）圧力損失
（ｍｍＡｑ）とした。また実用上から、（ａ）捕集率が
９０％以上で、かつ（ｂ）圧力損失が、３６０ｍｍＡｑ
未満を優（◎）、３６０〜４００ｍｍＡｑを良（○）、
４００ｍｍＡｑを超えるものをＮＧ（×）として評価
（ｃ）した。また、捕集率が９０％未満のものはＮＧ
（×）として評価した。(Measurement of collection rate and pressure loss) 3 g / carbon powder having a particle diameter of 0.042 μm was added to the honeycomb filter 10.
(a) Collection rate (%) [(input amount-exhaust amount) / (input amount)] after inputting for 2 hours at h, inflow side 11d and outflow side 1
A differential pressure of 1e was measured. And the differential pressure was made into (b) pressure loss (mmAq). From a practical point of view, (a) the collection rate is 90% or more, and (b) the pressure loss is 360 mmAq.
Less than excellent (⊚), 360 to 400 mmAq good (∘),
Those having a value of more than 400 mmAq were evaluated (c) as NG (x). If the collection rate is less than 90%, it is NG.
It evaluated as (x).
【００２５】表１に、ハニカムフィルタ１０の気孔率、
平均細孔径及び表面粗さに対する、（ａ）捕集率、
（ｂ）圧力損失、（ｃ）評価の結果を示す。Table 1 shows the porosity of the honeycomb filter 10,
(A) collection ratio with respect to average pore diameter and surface roughness,
The results of (b) pressure loss and (c) evaluation are shown.
【００２６】[0026]
【表１】 [Table 1]
【００２７】表１から、発明例１〜１０は、気孔率が５
５〜７５％、平均細孔径が１０〜４０μｍ、表面粗さ
（最大高さＲｙ）が１０μｍ以上であるので、捕集率が
高く、かつ圧力損失の少ないハニカムフィルタ１０とな
っていることがわかる。From Table 1, invention examples 1 to 10 have a porosity of 5
Since it is 5 to 75%, the average pore diameter is 10 to 40 μm, and the surface roughness (maximum height Ry) is 10 μm or more, it can be seen that the honeycomb filter 10 has a high collection rate and a small pressure loss. .
【００２８】一方、比較例１〜５は、気孔率、平均細孔
径、表面粗さ（最大高さＲｙ）の何れかが、気孔率５５
〜７５％、平均細孔径１０〜４０μｍ、表面粗さ（最大
高さＲｙ）１０μｍ以上の範囲外であるので、捕集率及
び／又は圧力損失の評価が低くなっている。On the other hand, in Comparative Examples 1 to 5, any one of the porosity, the average pore diameter, and the surface roughness (maximum height Ry) shows the porosity of 55.
˜75%, average pore diameter 10 to 40 μm, and surface roughness (maximum height Ry) outside the range of 10 μm or more, so the evaluation of the collection rate and / or pressure loss is low.
【００２９】[0029]
【発明の効果】以上詳細に説明のとおり、本発明のハニ
カムフィルタは、気孔率を５５〜７５％、平均細孔径を
１０〜４０μｍとしていることから、低圧力損失が得ら
れ、セル壁表面の表面粗さを１０μｍ以上としているた
め、排気ガス中の微粒子を高効率で捕集することが可能
となり、捕集時間の延長が可能となる。As described in detail above, since the honeycomb filter of the present invention has a porosity of 55 to 75% and an average pore size of 10 to 40 μm, a low pressure loss is obtained and the cell wall surface Since the surface roughness is 10 μm or more, the fine particles in the exhaust gas can be collected with high efficiency, and the collection time can be extended.
【図１】ハニカム構造体の斜視図である。FIG. 1 is a perspective view of a honeycomb structure.
【図２】図１のハニカム構造体を用いた排気ガス浄化フ
ィルタ１０の一例の断面模式図である。FIG. 2 is a schematic sectional view of an example of an exhaust gas purification filter 10 using the honeycomb structure of FIG.
１０ａ：流入
１０ｂ：排出
１０：多孔質セラミックハニカムフィルタ（ハニカムフ
ィルタ）
１１：多孔質セラミックハニカム構造体（ハニカム構造
体）
１１ａ：外周壁
１１ｂ：セル壁
１１ｃ：セル
１１ｄ：流入側
１１ｅ：流出側
１２ａ，１２ｂ：目封じ材10a: inflow 10b: exhaust 10: porous ceramic honeycomb filter (honeycomb filter) 11: porous ceramic honeycomb structure (honeycomb structure) 11a: outer peripheral wall 11b: cell wall 11c: cell 11d: inflow side 11e: outflow side 12a , 12b: sealing material
Claims (3)
により囲まれた多数のセルを有するハニカム構造体のセ
ルの片端面を目封じ材で目封じして、排気ガスを前記セ
ル壁の細孔を通過させて隣接セルに流し、排気ガスに含
まれる微粒子を前記セル壁で捕集する多孔質セラミック
ハニカムフィルタであって、前記セル壁の気孔率が５５
〜７５％、平均細孔径が１０〜４０μｍ、表面粗さ（最
大高さＲｙ）が１０μｍ以上であることを特徴とする多
孔質セラミックハニカムフィルタ。1. An exhaust gas is obtained by sealing one end surface of a cell of a honeycomb structure having an outer peripheral wall and a large number of cells surrounded by cell walls on the inner peripheral side of the outer peripheral wall with a sealing material. A porous ceramic honeycomb filter which allows fine particles contained in exhaust gas to be collected by the cell walls by passing through the pores of the cell walls to adjacent cells and having a porosity of the cell walls of 55.
˜75%, average pore diameter 10 to 40 μm, and surface roughness (maximum height Ry) of 10 μm or more, a porous ceramic honeycomb filter.
ることを特徴とする請求項１記載の多孔質セラミックハ
ニカムフィルタ。2. The porous ceramic honeycomb filter according to claim 1, wherein the cell wall has a porosity of 60 to 70%.
結晶がコージェライトであることを特徴とする請求項１
又は請求項２記載の多孔質セラミックハニカムフィル
タ。3. The main crystal of ceramics constituting the cell wall is cordierite.
Alternatively, the porous ceramic honeycomb filter according to claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001184060A JP2003001029A (en) | 2001-06-18 | 2001-06-18 | Porous ceramic honeycomb filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001184060A JP2003001029A (en) | 2001-06-18 | 2001-06-18 | Porous ceramic honeycomb filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003001029A true JP2003001029A (en) | 2003-01-07 |
Family
ID=19023895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001184060A Pending JP2003001029A (en) | 2001-06-18 | 2001-06-18 | Porous ceramic honeycomb filter |
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| Country | Link |
|---|---|
| JP (1) | JP2003001029A (en) |
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|---|---|---|---|---|
| WO2004076027A1 (en) * | 2003-02-28 | 2004-09-10 | Ibiden Co., Ltd. | Ceramic honeycomb structure |
| WO2004087294A1 (en) * | 2003-03-31 | 2004-10-14 | Ngk Insulators, Ltd. | Base for honeycomb filter, method for producing same and honeycomb filter |
| EP1489274A1 (en) † | 2002-03-04 | 2004-12-22 | Ibiden Co., Ltd. | Honeycomb filter for exhaust gas decontamination and exhaust gas decontamination apparatus |
| WO2004111398A1 (en) * | 2003-06-05 | 2004-12-23 | Ibiden Co., Ltd. | Honeycomb structure body |
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| US7316722B2 (en) | 2002-09-13 | 2008-01-08 | Ibiden Co., Ltd. | Honeycomb structure |
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| US8062603B2 (en) | 2003-06-23 | 2011-11-22 | Ibiden Co., Ltd. | Honeycomb structural body |
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