JPH0729861B2 - Fiber-ceramic porous body and exhaust gas filter using the same - Google Patents
Fiber-ceramic porous body and exhaust gas filter using the sameInfo
- Publication number
- JPH0729861B2 JPH0729861B2 JP21404288A JP21404288A JPH0729861B2 JP H0729861 B2 JPH0729861 B2 JP H0729861B2 JP 21404288 A JP21404288 A JP 21404288A JP 21404288 A JP21404288 A JP 21404288A JP H0729861 B2 JPH0729861 B2 JP H0729861B2
- Authority
- JP
- Japan
- Prior art keywords
- filter
- fiber
- porous body
- exhaust gas
- ceramic porous
- 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.)
- Expired - Lifetime
Links
- 239000000919 ceramic Substances 0.000 title claims description 23
- 239000000835 fiber Substances 0.000 claims description 49
- 229910000323 aluminium silicate Inorganic materials 0.000 claims description 21
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 21
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims description 18
- 239000002994 raw material Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 11
- 238000005245 sintering Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 11
- 230000008646 thermal stress Effects 0.000 description 9
- 239000004927 clay Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 230000008929 regeneration Effects 0.000 description 6
- 238000011069 regeneration method Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 239000000567 combustion gas Substances 0.000 description 4
- 239000012784 inorganic fiber Substances 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- HEHRHMRHPUNLIR-UHFFFAOYSA-N aluminum;hydroxy-[hydroxy(oxo)silyl]oxy-oxosilane;lithium Chemical compound [Li].[Al].O[Si](=O)O[Si](O)=O.O[Si](=O)O[Si](O)=O HEHRHMRHPUNLIR-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052670 petalite Inorganic materials 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2068—Other inorganic materials, e.g. ceramics
- B01D39/2082—Other inorganic materials, e.g. ceramics the material being filamentary or fibrous
- B01D39/2086—Other inorganic materials, e.g. ceramics the material being filamentary or fibrous sintered or bonded by inorganic agents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Filtering Materials (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は排ガスを浄化するフィルタ、特にディーゼル排
ガス中に含まれるパーティキュレート（スス）を除去
し、フィルタの再生を繰り返し安全に行い得るディーゼ
ル排ガスフィルタ用の繊維セラミックス多孔体とそれを
用いた排ガスフィルタに関する。Description: FIELD OF THE INVENTION The present invention relates to a filter for purifying exhaust gas, particularly for a diesel exhaust gas filter that can safely remove particulates (soot) contained in diesel exhaust gas and regenerate the filter repeatedly and safely. The present invention relates to a porous fiber-ceramic material and an exhaust gas filter using the same.
従来の技術 ディーゼルエンジンの排ガスフィルタとして、無機質繊
維であるアルミノシリケート繊維をセラミック原料粉末
で焼結させた繊維セラミックをハニカム形状のフィルタ
として用いるものが特公昭62−56771号公報で知られて
いる。この従来技術は、無機質繊維としてアルミノシリ
ケート繊維、セラミック原料粉末として木節粘土、ペタ
ライト粉末から抄紙法によって得られるシートをハニカ
ムフィルタ形状に成型して焼成することで無機質繊維と
セラミック原料粉末を焼結し、複合化しているものであ
る。2. Description of the Related Art As an exhaust gas filter for a diesel engine, a filter using a fiber ceramic obtained by sintering aluminosilicate fiber, which is an inorganic fiber, with a ceramic raw material powder as a honeycomb filter is known from Japanese Patent Publication No. 62-56771. In this conventional technology, a sheet obtained by a papermaking method from aluminosilicate fiber as the inorganic fiber, Kibushi clay as the ceramic raw material powder, and petalite powder is molded into a honeycomb filter shape and fired to sinter the inorganic fiber and the ceramic raw material powder. However, it is a complex one.
発明が解決しようとする課題 ディーゼルエンジンに含まれるパーティキュレートを一
定量濾過したフィルタは、フィルタ上でパーティキュレ
ートを焼却して再生（リジェネレーション）される。こ
のリジェネレーションには最近、バーナの燃焼ガスを用
いてフィルタ上のパーティキュレートを加熱し、焼却す
る方法が検討されている。この燃焼ガスでフィルタを加
熱した場合、フィルタの横断面内の、燃焼ガスが十分に
流れる部分はほぼ均一な温度を示すが、ガスの流れが少
ない部分、特に外周部分で急激に低くなる温度勾配が生
じる。また、フィルタを保持するクッション材が熱を奪
うためこの温度勾配をさらに大きなものとしている。そ
の結果、フィルタの最外周に大きな熱応力が発生してク
ラックを生じ、フィルタを破壊する場合があった。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention A filter obtained by filtering a certain amount of particulates contained in a diesel engine is incinerated and regenerated (regenerated) on the filter. For this regeneration, a method of heating and burning the particulates on the filter by using the combustion gas of the burner has recently been studied. When the filter is heated with this combustion gas, the temperature in the cross-section of the filter where the combustion gas flows sufficiently shows a substantially uniform temperature, but the temperature gradient that sharply decreases in the part where the gas flow is low, especially in the outer peripheral part. Occurs. In addition, since the cushion material that holds the filter absorbs heat, this temperature gradient is further increased. As a result, a large thermal stress is generated on the outermost periphery of the filter to cause a crack, which may destroy the filter.
即ち、リジェネレーション時にフィルタの外周付近に発
生する温度勾配によって発生する熱応力が、外周壁で最
大となり、外周壁の強度を上まわるためクラックを生じ
ているのである。That is, the thermal stress generated by the temperature gradient generated in the vicinity of the outer periphery of the filter at the time of regeneration becomes maximum on the outer peripheral wall and exceeds the strength of the outer peripheral wall, so that cracks occur.
アルミノシリケート繊維は、初期のアモルファス状態を
保っているときには100kg/mm2を超える引っ張り強度を
有しているが、1000℃以上の加熱によってムライト結晶
を晶出するにともなって強度は低下する。このアルミノ
シリケート繊維と、セラミック原料粉末を焼結させて得
られる繊維セラミックも同様の挙動を示す。この強度の
低下によって、フィルタはリジェネレーション時の熱応
力に耐えられずにクラックを発生していた。The aluminosilicate fiber has a tensile strength of more than 100 kg / mm 2 in the initial amorphous state, but its strength decreases as mullite crystals are crystallized by heating at 1000 ° C or higher. The aluminosilicate fiber and the fiber ceramic obtained by sintering the ceramic raw material powder also exhibit similar behavior. Due to this decrease in strength, the filter could not withstand the thermal stress during regeneration and cracked.
本発明はこの問題点を、加熱によって強度の変化しない
セラミック繊維を複合させることで、材料の強度向上を
図って解決することを目的とする。An object of the present invention is to solve this problem by improving the strength of the material by combining ceramic fibers whose strength does not change by heating.
課題を解決するための手段 本発明は、焼成によって強度の変化しにくいセラミック
繊維としてカリウムチタネート繊維を用い、アルミノシ
リケート繊維とセラミック原料粉末を互いに焼結させる
とともにカリウムチタネート繊維を複合化して繊維セラ
ミック多孔体としたものである。Means for Solving the Problems The present invention uses potassium titanate fiber as a ceramic fiber whose strength is not easily changed by firing, and aluminosilicate fiber and ceramic raw material powder are sintered together and potassium titanate fiber is compounded to form a fiber ceramic porous material. It is a body.
作用 本発明はアルミノシリケート繊維に加えて加熱後も強度
の変化しないカリウムチタネート繊維を用いて無機質繊
維の複合化を図ったので、多孔性を保ちつつ強度を向上
させることができる。これを用いることによって、例え
ば排ガスフィルタにおいては、リジェネレーション時に
フィルタ内に発生する温度勾配で生じる熱応力に十分耐
え、クラックの発生を防止することができる。Effect In the present invention, since the inorganic fiber is compounded by using the potassium titanate fiber whose strength does not change even after heating in addition to the aluminosilicate fiber, it is possible to improve the strength while maintaining the porosity. By using this, for example, in an exhaust gas filter, it is possible to sufficiently withstand the thermal stress generated by the temperature gradient generated in the filter during regeneration and prevent the generation of cracks.
実施例 以下に本発明の実施例を図面を参照して説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
実施例１ 平均繊維径が約３μｍで、0.1〜10mmの長さにチョップ
したアルミノシリケート繊維と、繊維径約1.5μｍで長
さ10〜50μmmのカリウム６−チタネート繊維を用いた。
このアルミノシリケート繊維14重量部、カリウムチタネ
ート繊維２重量部を水1000重量部に、十分に分散させて
懸濁させた。Example 1 Aluminosilicate fibers having an average fiber diameter of about 3 μm and chopped to a length of 0.1 to 10 mm and potassium 6-titanate fibers having a fiber diameter of about 1.5 μm and a length of 10 to 50 μm were used.
14 parts by weight of this aluminosilicate fiber and 2 parts by weight of potassium titanate fiber were sufficiently dispersed and suspended in 1000 parts by weight of water.
一方、セラミック原料粉末としてセリサイト粘土10重量
部を水50重量部に懸濁させた。この繊維懸濁液とペタラ
イト粘土懸濁液を攪拌しつつ混合した。次に有機質結合
剤として酢酸ビニルーアクリル共重合エマルジョン溶液
を１重量部加えて十分に攪拌混合させたのち、塩化アル
ミニウム溶液を添加して水酸化ナトリウム溶液で中和し
て水酸化アルミニウムコロイドを生成させた。このコロ
イドでアルミノシリケート繊維、カリウムチタネート繊
維、粘土、有機質結合剤を互いに凝集させた。次に、高
分子凝集剤を添加して凝集を完結させた。こうして得ら
れた凝集懸濁液を水で3000重量部に希釈したのち、通常
の抄紙機で抄造してシートを作成した。On the other hand, as a ceramic raw material powder, 10 parts by weight of sericite clay was suspended in 50 parts by weight of water. The fiber suspension and the petalite clay suspension were mixed with stirring. Next, 1 part by weight of a vinyl acetate-acrylic copolymer emulsion solution as an organic binder was added and mixed thoroughly with stirring, and then an aluminum chloride solution was added and neutralized with a sodium hydroxide solution to form an aluminum hydroxide colloid. Let With this colloid aluminosilicate fibers, potassium titanate fibers, clay and organic binders were coagulated together. Next, a polymer flocculant was added to complete the flocculation. The flocculated suspension thus obtained was diluted with water to 3000 parts by weight, and then made into a sheet by a conventional paper machine.
このシートを所定の形状に成形して、電気炉中1250℃で
焼成してフィルタ材料が得られる。This sheet is formed into a predetermined shape and fired at 1250 ° C. in an electric furnace to obtain a filter material.
また、別に準備した鋳込み成形型に、上記の凝集懸濁液
を注入して得られる成形品を同様に1250℃で焼成する方
法でも、任意のフィルタ材料が得られる。Further, an arbitrary filter material can be obtained also by a method of injecting the above coagulated suspension into a separately prepared casting mold and firing the molded product similarly at 1250 ° C.
このフィルタ材料の引っ張り強度は、アルミノシリケー
ト繊維のみを用いた場合の約９倍を有していた。また、
気孔率は約３％低下したが、空気の通過抵抗にはほとん
ど影響が見られなかった。The tensile strength of this filter material was about 9 times that when only aluminosilicate fibers were used. Also,
The porosity was reduced by about 3%, but the air passage resistance was hardly affected.
実施例２ 実施例１で得られたシートを二分し、一方を歯車形状の
二本のロールをもつコルゲートマシンを用い、コルゲー
ト状に成形するとともに、粉砕したアルミノシリケート
繊維と、カリウムチタネート繊維と、セリサイト粘土を
ポリビニルアルコールでペースト状にしたプラグ原料を
コルゲートの一端に注入しつつ、粉砕したアルミノシリ
ケート繊維と、カリウムチタネート繊維と、セリサイト
粘土を澱粉糊とポリビニルアルコールで混練して得られ
る接着剤をコルゲート頂部に塗布して他方の平板状シー
トを貼付ける。ここで得られた段ボール形状の成形体の
コルゲート頂部に上記接着剤を塗布するとともに、上記
プラグ原料をもう一方の端部に注入して円筒状に巻き上
げてハニカム形状の成形体を得た。この成形体はハニカ
ムセルの一端がプラグ原料で封止され他端で開放し、隣
接するセルでは他端が同じくプラグ原料で封止された構
造を持つ。これを電気炉中1250℃に昇温して２時間加熱
焼成すると有機物は焼失し、アルミノシリケート繊維、
セリサイト粘土は互いに焼結してセラミック化し、カリ
ウムチタネート繊維が複合化された繊維セラミックハニ
カム構造のフィルタが得られた。Example 2 The sheet obtained in Example 1 was divided into two parts, one of which was formed into a corrugated shape using a corrugating machine having two gear-shaped rolls, and crushed aluminosilicate fibers and potassium titanate fibers, Adhesion obtained by kneading ground aluminosilicate fiber, potassium titanate fiber, and sericite clay with starch paste and polyvinyl alcohol while injecting a plug material made of paste of sericite clay into polyvinyl alcohol into one end of a corrugate Apply the agent to the top of the corrugate and apply the other flat sheet. The adhesive was applied to the corrugated top of the corrugated board-shaped molded body obtained here, and the plug raw material was injected into the other end and rolled up into a cylindrical shape to obtain a honeycomb-shaped molded body. This molded body has a structure in which one end of a honeycomb cell is sealed with a plug raw material and the other end is opened, and adjacent cells are similarly sealed with a plug raw material at the other end. When this is heated to 1250 ° C in an electric furnace and heated and baked for 2 hours, organic matter is burned off, and aluminosilicate fiber,
The sericite clay was sintered together into a ceramic, and a filter having a fiber-ceramic honeycomb structure in which potassium titanate fibers were composited was obtained.
本実施例で得られたフィルタ１を第１図に示す。２は出
口側がプラグ３で封止されたセルで、４は入口側がプラ
グ３で封止され出口側に開口したセルである。The filter 1 obtained in this example is shown in FIG. 2 is a cell whose outlet side is sealed with a plug 3, and 4 is a cell whose inlet side is sealed with a plug 3 and is open to the outlet side.
得られたフィルタ１をディーゼルエンジンの排気系に第
２図に示すような構成で配設した。エンジン側の排気管
５に三方バルブ６を設け、バルブ６の出口を一方はフィ
ルタ１に、他方はフィルタ１を迂回してフィルタ１後方
の排気管７に接続されたバイパス８に連通させている。
また、フィルタ１は外周を断熱性に優れたクッション材
９で覆ってケース10に収納されている。ケース10のフィ
ルタ１前方には燃焼室11を有するバーナ12が取り付けら
れている。まず、排気管５がフィルタ１に連通するよう
にバルブ６をセットしディーゼルエンジンを運転してフ
ィルタ１にパーティキュレートを一定量堆積させた。次
にバルブ６を切り替えて排ガスをバイパス８に流し、バ
ーナ12に点火して得られる高温度のガスを過剰の空気と
ともに燃焼ガスとしてフィルタ１に送ってフィルタ１を
加熱してパーティキュレートを酸化焼却した。この時の
フィルタ１内部の温度分布を測定した結果を第３図に示
す。この図で明らかなように、フィルタ外周で温度が急
激に低下し、温度勾配が著しく大きいことが判かる。こ
の著しい温度勾配のためにフィルタ内部には熱応力が発
生し、フィルタ外周で最大となって外周部にクラックを
発生する場合があった。The obtained filter 1 was arranged in the exhaust system of a diesel engine with the structure shown in FIG. A three-way valve 6 is provided in the exhaust pipe 5 on the engine side, and the outlet of the valve 6 is connected to the filter 1 on one side and the bypass 8 connected to the exhaust pipe 7 behind the filter 1 by bypassing the filter 1 on the other side. .
The filter 1 is housed in a case 10 with its outer periphery covered with a cushioning material 9 having excellent heat insulating properties. A burner 12 having a combustion chamber 11 is attached to the front of the filter 1 of the case 10. First, the valve 6 was set so that the exhaust pipe 5 communicated with the filter 1 and the diesel engine was operated to deposit a certain amount of particulates on the filter 1. Next, the valve 6 is switched to flow the exhaust gas to the bypass 8 and the high temperature gas obtained by igniting the burner 12 is sent to the filter 1 as combustion gas together with excess air to heat the filter 1 to oxidize and incinerate the particulates. did. The result of measuring the temperature distribution inside the filter 1 at this time is shown in FIG. As is clear from this figure, it can be seen that the temperature sharply decreases at the outer periphery of the filter and the temperature gradient is extremely large. Due to this remarkable temperature gradient, thermal stress is generated inside the filter, and it may become maximum at the outer periphery of the filter, causing cracks at the outer periphery.
しかるに、本発明のカリウムチタネート繊維を複合した
フィルタを用いた場合、リジェネレーションの繰り返
し、また、第３図に示したより大きな温度勾配を実験と
して加えてもクラックはまったく観察されなかった。こ
れは、カリウムチタネート繊維を複合したことによって
本フィルタ材料の引っ張り強度が、外周にかかる熱応力
に十分に耐え得るものとなったためである。即ち、加熱
により強度の低下することのないカリウムチタネート繊
維はアルミノシリケート繊維とセラミック原料粉末の焼
結箇所に取り込まれたり、あるいは焼結箇所間を接合し
てアルミノシリケート繊維同志の結合を補強する形で複
合化されているためである。However, when the filter of the present invention containing potassium titanate fiber was used, no cracks were observed even after repeated regeneration and addition of a larger temperature gradient shown in FIG. 3 as an experiment. This is because the tensile strength of the present filter material can sufficiently withstand the thermal stress applied to the outer circumference by combining the potassium titanate fibers. That is, the potassium titanate fiber, whose strength does not decrease by heating, is taken in at the sintering location of the aluminosilicate fiber and the ceramic raw material powder, or is joined between the sintering locations to reinforce the bond between the aluminosilicate fibers. It is because it is compounded in.
一方、従来のアルミノシリケート繊維のみからなるフィ
ルタにもクラックを発生しないものがあることから、ア
ルミノシリケート繊維からなる材料の強度と発生する熱
応力がほぼ等しい状態にあることがわかる。従って、カ
リウムチタネート繊維を複合した本発明の材料を用いて
構成したフィルタは、引っ張り強度が９倍になっている
ことから、クラックを生じさせる熱応力に対して９倍の
安全率を有していることがわかる。On the other hand, since some conventional filters made only of aluminosilicate fibers do not generate cracks, it is understood that the strength of the material made of aluminosilicate fibers and the generated thermal stress are almost equal. Therefore, the filter constructed by using the material of the present invention in which potassium titanate fibers are composited has a tensile strength of 9 times, and therefore has a safety factor of 9 times against the thermal stress that causes cracks. You can see that
さらに、カリウムチタネート繊維を複合化したフィルタ
は、堆積したパーティキュレートの酸化開始温度が従来
のアルミノシリケート繊維のみの場合に比べて約15℃低
い温度であった。これは、複合化したカリウムチタネー
ト繊維のカリウムがパーティキュレートを構成するスス
や炭化水素の酸化触媒として作用しているためとみられ
る。従って、バーナによる加熱ガスの温度を低く設定す
ることが可能で、これにより、フィルタの内部に発生す
る温度勾配も小さくでき、よりクラックの発生しにくい
フィルタが得られる。Furthermore, in the filter in which the potassium titanate fiber was composited, the oxidation start temperature of the deposited particulates was about 15 ° C lower than that in the case of the conventional aluminosilicate fiber alone. This is considered to be because the potassium of the composite potassium titanate fiber acts as an oxidation catalyst for soot and hydrocarbons forming the particulates. Therefore, it is possible to set the temperature of the heating gas by the burner to a low value, which can reduce the temperature gradient generated inside the filter, and to obtain a filter in which cracks are less likely to occur.
発明の効果 本発明によれば、アルミノシリケート繊維と、セラミッ
ク原料粉末を焼結結合させるとともにカリウムチタネー
ト繊維を複合化することで、高強度とすることができ、
排ガスフィルタとして用いたときに発生する温度勾配に
よる熱応力に抗することができ、その結果、クラックに
よるフィルタの破壊を未然に防ぐ効果を有する。EFFECTS OF THE INVENTION According to the present invention, aluminosilicate fiber and ceramic raw material powder are sintered and bonded together with potassium titanate fiber to form a composite material, which can have high strength,
It is possible to withstand the thermal stress due to the temperature gradient generated when it is used as an exhaust gas filter, and as a result, it is possible to prevent the filter from being destroyed by cracks.
さらに、カリウムによる、パーティキュレートの酸化触
媒としての効果も期待できる。Furthermore, the effect of potassium as an oxidation catalyst of particulates can be expected.
第１図は本発明のフィルタ材料を用いて構成した排ガス
フィルタの一実施例を示す斜視図、第２図は第１図の排
ガスフィルタをディーゼルエンジンの排ガス系に設置し
た装置の概略構成図、第３図は第２図に示した装置でリ
ジェネレーションを行ったときのフィルタ内部の温度分
布を示した図である。 １……フィルタ、2,4……セル。FIG. 1 is a perspective view showing an embodiment of an exhaust gas filter constructed using the filter material of the present invention, and FIG. 2 is a schematic configuration diagram of an apparatus in which the exhaust gas filter of FIG. 1 is installed in an exhaust gas system of a diesel engine, FIG. 3 is a diagram showing a temperature distribution inside the filter when regeneration is performed by the apparatus shown in FIG. 1 ... filter, 2,4 ... cell.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭60−226450（ＪＰ，Ａ) 特開 昭58−223420（ＪＰ，Ａ) 特開 平２−180772（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-60-226450 (JP, A) JP-A-58-223420 (JP, A) JP-A-2-180772 (JP, A)
Claims (3)
料粉末を互いに焼結させて構成される繊維セラミック多
孔体にカリウムチタネート繊維を複合化した繊維セラミ
ック多孔体。1. A fibrous ceramic porous body in which potassium titanate fibers are combined with a fibrous ceramic porous body formed by sintering aluminosilicate fibers and ceramic raw material powder together.
料粉末を互いに焼結させて構成される繊維セラミック多
孔体にカリウムチタネート繊維を複合化した繊維セラミ
ック多孔体からなり、ハニカム形状であって、セル端部
を交互に閉塞してなる排ガスフィルタ。2. A fibrous ceramic porous body obtained by compositing potassium titanate fibers into a fibrous ceramic porous body formed by sintering aluminosilicate fiber and ceramic raw material powder together, and having a honeycomb shape and cell end portions. An exhaust gas filter that is alternately closed.
ネート繊維を複合化した繊維セラミック多孔体で構成し
た特許請求の範囲第２項記載の排ガスフィルタ。3. The exhaust gas filter according to claim 2, wherein at least the outer periphery of the filter is made of a fiber ceramic porous body in which potassium titanate fibers are composited.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21404288A JPH0729861B2 (en) | 1988-08-29 | 1988-08-29 | Fiber-ceramic porous body and exhaust gas filter using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21404288A JPH0729861B2 (en) | 1988-08-29 | 1988-08-29 | Fiber-ceramic porous body and exhaust gas filter using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0264073A JPH0264073A (en) | 1990-03-05 |
| JPH0729861B2 true JPH0729861B2 (en) | 1995-04-05 |
Family
ID=16649313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21404288A Expired - Lifetime JPH0729861B2 (en) | 1988-08-29 | 1988-08-29 | Fiber-ceramic porous body and exhaust gas filter using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0729861B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3139905B2 (en) * | 1993-12-29 | 2001-03-05 | ニチアス株式会社 | Oil holding cylinder for oil application roller |
| US5876640A (en) * | 1995-07-04 | 1999-03-02 | Nichias Corporation | Process for producing a coating fluid holding member |
-
1988
- 1988-08-29 JP JP21404288A patent/JPH0729861B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0264073A (en) | 1990-03-05 |
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