JP3211408B2 - Filter material - Google Patents
Filter materialInfo
- Publication number
- JP3211408B2 JP3211408B2 JP27113792A JP27113792A JP3211408B2 JP 3211408 B2 JP3211408 B2 JP 3211408B2 JP 27113792 A JP27113792 A JP 27113792A JP 27113792 A JP27113792 A JP 27113792A JP 3211408 B2 JP3211408 B2 JP 3211408B2
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- Prior art keywords
- dimensional
- weight
- filter material
- skeleton
- porous metal
- Prior art date
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Description
【０００１】[0001]
【産業上の利用分野】この発明は、自動車用の排ガスフ
ィルタとして利用するのに好適なフィルタ材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter material suitable for use as an exhaust gas filter for automobiles.
【０００２】[0002]
【従来の技術と課題】ディーゼルエンジン車から排出さ
れる微粒子（すす等の固体成分）は社会問題となってお
り、自動車メーカはフィルタシステムの開発に力をそそ
いでいるが、ハニカム状コーデイエライトセラミックス
を用いたフィルタでは、捕集性能は優れているが捕集し
た微粒子を除去する際の再生燃焼時にヒートスポットが
できやすく、溶損や、熱応力によるひび割れが発生しや
すい欠点がある。このため、複雑なコントロールシステ
ムが必要とされている。2. Description of the Related Art Fine particles (solid components such as soot) emitted from diesel engine vehicles have become a social problem, and automobile manufacturers are focusing on the development of filter systems. Filters using ceramics have excellent collection performance, but have the disadvantage that heat spots are easily formed during regeneration and combustion when removing the collected fine particles, and erosion and cracking due to thermal stress tend to occur. For this reason, a complicated control system is required.
【０００３】ディーゼルエンジン車は、燃費が安く、ガ
ソリン車よりも市場性があるが、排ガス処理の費用が嵩
むとせっかくの利点が生かされない。このため、捕集性
能に優れ、しかも熱に強くて特別な保護対策を必要とし
ないフィルタ材が望まれている。[0003] Diesel engine vehicles are cheaper in fuel efficiency and more marketable than gasoline vehicles, but if the cost of exhaust gas treatment increases, the advantages of the exhaust system cannot be used. Therefore, there is a demand for a filter material which is excellent in trapping performance, is resistant to heat, and does not require special protective measures.
【０００４】この発明は、かかる要求に応えたフィルタ
材を提供しようとするものである。An object of the present invention is to provide a filter material meeting such a demand.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決するた
め、この発明は、耐熱性の有る材料、好ましくはＮｉ−
Ｃｒ−Ａｌ系の材料で作られた三次元網状金属多孔体の
三次元骨格表面に、アルミナ繊維状結晶を具備させたも
のをフィルタ材として使用するようにしたのである。In order to solve the above-mentioned problems, the present invention provides a heat-resistant material, preferably Ni-
A filter having a three-dimensional skeleton surface of a three-dimensional network porous metal body made of a Cr-Al-based material and having alumina fibrous crystals is used as a filter material.
【０００６】なお、三次元骨格表面のアルミナ繊維状結
晶は、三次元網状金属多孔体がＮｉ−Ｃｒ−Ａｌ系のも
のである場合には、この多孔体を大気中、或いは酸化性
ガス雰囲気中、８００〜１０００℃で高温酸化させて容
易に生成することができる。The alumina fibrous crystal on the surface of the three-dimensional skeleton may be formed in the air or in an oxidizing gas atmosphere when the three-dimensional mesh metal porous body is of a Ni—Cr—Al type. , At a high temperature of 800 to 1000 ° C.
【０００７】Ｎｉ−Ｃｒ−Ａｌ系の三次元網状金属多孔
体は、例えば、Ｎｉの三次元網状金属多孔体に、Ｃｒ、
Ａｌを拡散浸透して合金化することにより得られる。こ
の多孔体は、組成がＣｒ：１５〜４０重量％、Ａｌ：１
〜８重量％、残部：Ｎｉ及び不可避成分となるように拡
散浸透処理条件（粉末組成、粉末量、温度、時間）を選
定する。また、この組成中に、更に、イットリウム、ネ
オジウム等の希土類元素の１種もしくは２種以上を０．
０５〜０．５重量％含有させると、耐熱性の面でより優
れたものになる。[0007] Ni-Cr-Al-based three-dimensional network porous metal is, for example, a three-dimensional Ni metal porous body added with Cr,
It is obtained by diffusing and infiltrating Al to form an alloy. This porous body has a composition of Cr: 15 to 40% by weight, Al: 1
８8% by weight, balance: Nitrogen and infiltration treatment conditions (powder composition, powder amount, temperature, time) are selected so as to be unavoidable components. Further, in this composition, one or more rare earth elements such as yttrium and neodymium are added to the composition.
When the content is from 0.5 to 0.5% by weight, the composition becomes more excellent in heat resistance.
【０００８】[0008]
【作用】三次元骨格表面のアルミナ繊維状結晶は、耐熱
性を有するため、１０００℃以上の高温にも耐える。そ
して、三次元骨格表面のアルミナ繊維状結晶により、三
次元骨格表面の平滑性が改善され、排気ガス中の固体ま
たは液体成分が三次元骨格表面に強力に捕集される。ま
た、ＡｌをＣｒとともに合金化した三次元網状金属多孔
体は、Ａｌが硫黄や硫酸成分に強い安定酸化物を形成す
るため、自動車の排ガスに対する耐食性も良好である。The alumina fibrous crystal on the surface of the three-dimensional skeleton has heat resistance and can withstand a high temperature of 1000 ° C. or more. Then, the smoothness of the three-dimensional skeleton surface is improved by the alumina fibrous crystals on the three-dimensional skeleton surface, and solid or liquid components in the exhaust gas are strongly collected on the three-dimensional skeleton surface. In addition, the three-dimensional mesh metal porous body in which Al is alloyed with Cr has a good corrosion resistance to exhaust gas from automobiles because Al forms a stable oxide that is strong against sulfur and sulfuric acid components.
【０００９】以下に、Ｎｉ−Ｃｒ−Ａｌ系の三次元網状
金属多孔体について成分の含有量等を限定した理由を記
す。The reasons for limiting the content of components and the like in the Ni-Cr-Al-based three-dimensional reticulated metal porous body are described below.
【００１０】Ｃｒは、耐熱性、耐酸化性を確保する基本
元素である。本発明にあっては、アルミナ（Ａｌ
2 Ｏ3 ）皮膜が耐酸化性確保の主体となるが、Ｃｒが欠
乏するとこの皮膜の密着性や保護性が低下して耐酸化性
の維持に問題が出る。一方、Ｃｒが過剰になると靱性が
低下し、従ってこれ等の問題を共になくし得る範囲とし
てＣｒ含有量を１５〜４０重量％に規定した。[0010] Cr is a basic element for ensuring heat resistance and oxidation resistance. In the present invention, alumina (Al
The 2 O 3 ) film is the main component for securing the oxidation resistance. However, when Cr is deficient, the adhesion and protection of the film are reduced, and there is a problem in maintaining the oxidation resistance. On the other hand, when the Cr content is excessive, the toughness is reduced. Therefore, the content of Cr is set to 15 to 40% by weight as a range that can eliminate both of these problems.
【００１１】また、耐熱性を維持するためには、Ａｌも
１重量％は含有している必要がある。このＡｌは、１重
量％未満では耐熱性の改善効果が薄い。また、加工性の
点で８重量％以上含有するのは好ましくなく、従って、
その含有量は１〜８重量％とし、加工性の要求度合を考
えてその中から適当な値を選ぶ。Further, in order to maintain heat resistance, it is necessary that Al also contains 1% by weight. If this Al is less than 1% by weight, the effect of improving heat resistance is small. In addition, it is not preferable to contain 8% by weight or more from the viewpoint of processability.
The content is set to 1 to 8% by weight, and an appropriate value is selected from the values in consideration of the required degree of workability.
【００１２】アルミナ繊維状結晶のアスペクト比（太さ
に対する長さの比）をより大きくしたい場合には、骨格
表面から深さ０．５μｍまでのＡｌ濃度を５重量％以上
にすればよい。When it is desired to increase the aspect ratio (the ratio of the length to the thickness) of the alumina fibrous crystal, the Al concentration from the surface of the skeleton to a depth of 0.5 μm should be 5% by weight or more.
【００１３】Ｎｉ−Ｃｒ−Ａｌ系の三次元網状金属多孔
体は、純Ｎｉの三次元網状金属多孔体にクロマイジング
処理と称される拡散浸透処理を施してＮｉ−Ｃｒ系三次
元網状金属多孔体となし、次いで、これをパイプ状に成
型した後、カロライジング処理する２段合金化処理や、
純Ｎｉの三次元網状金属多孔体を先ず初めにパイプ状に
成型し、その後、Ｃｒ、Ａｌを同時に拡散浸透する１段
合金化処理等によって作ることができる。処理の条件次
第では骨格表面付近のＡｌ合金量を多くし、表面の耐熱
性をより一層向上させることもできる。しかし、この場
合も全体の合金組成に占めるＡｌの割合は１重量％から
最大８重量％が限度であり、これ以上の添加では、成形
体の表面と言えども振動衝撃により欠ける等、靱性につ
いての保証ができない。The Ni-Cr-Al-based three-dimensional reticulated metal porous body is obtained by subjecting a pure Ni three-dimensional reticulated metal porous body to a diffusion and infiltration treatment called a chromizing treatment to obtain a Ni-Cr-based three-dimensional reticulated metal porous body. A two-stage alloying process of calorizing after forming this into a pipe, and then molding it into a pipe shape,
A three-dimensional net porous metal body made of pure Ni can be first formed into a pipe shape, and then formed by a one-stage alloying process in which Cr and Al are simultaneously diffused and infiltrated. Depending on the processing conditions, the amount of Al alloy near the skeleton surface can be increased, and the heat resistance of the surface can be further improved. However, also in this case, the proportion of Al in the entire alloy composition is limited from 1% by weight to a maximum of 8% by weight. I cannot guarantee it.
【００１４】アルミナ繊維状結晶は、骨格内にＡｌを拡
散させておいて熱処理するとできる。Ａｌはカロライン
ジング処理中の拡散時間を制御することにより、骨格の
表面から内側にかけて任意の深さで拡散浸透させること
ができるので、骨格表面は結晶が繊維状に成長し易い高
Ａｌ濃度を保ち、その一方で骨格内部は耐熱性を保持す
るのに必要なＡｌ量（１重量％）になるように拡散させ
ておくのが望ましい。The alumina fibrous crystal can be heat-treated with Al diffused in the skeleton. Al can be diffused and penetrated at an arbitrary depth from the surface of the skeleton to the inside by controlling the diffusion time during the carolining process, so the skeleton surface maintains a high Al concentration at which crystals grow easily into fibrous form. On the other hand, it is desirable that the inside of the skeleton is diffused so as to have an Al amount (1% by weight) necessary for maintaining heat resistance.
【００１５】このＮｉ−Ｃｒ−Ａｌ系の三次元網状金属
多孔体に、先に述べたイットリウム、ネオジウム等の希
土類元素を含有させると耐熱性は更に高まる。この希土
類元素の添加は、クロマイジング、カロライジング、或
いは１段合金化の際、拡散浸透材中に、添加しようとす
る元素の粉末を混合しておけばよいが、０．５重量％以
上の添加は後工程における繊維状結晶の生成の妨げにな
るし、また、０．０５重量％以下では耐熱性の向上効果
が現れない。When the Ni-Cr-Al-based three-dimensional mesh-like porous metal body contains a rare earth element such as yttrium and neodymium as described above, the heat resistance is further enhanced. The addition of the rare earth element may be performed by mixing the powder of the element to be added into the diffusion infiltration material during chromizing, calorizing, or one-step alloying. The addition hinders the formation of fibrous crystals in the subsequent step, and the effect of improving heat resistance does not appear at 0.05% by weight or less.
【００１６】アルミナ繊維状結晶を生成するときの温度
も、８００〜１０００℃の範囲でないとアスペクト比の
大きな繊維状結晶が得られない。アスペクト比の大きな
ものを得るための特に好ましい温度は８５０〜９５０℃
であり、８５０℃では１０時間以上、９５０℃では２時
間以上あれば十分である。１０００℃以上では凹凸の小
さい平坦に近い酸化皮膜になり易く、生成した酸化皮膜
の比表面積が小さ過ぎて捕集の役目をするには適さな
い。また、８００℃未満では原子拡散の遅延により酸化
の進行が遅れ、所望のウイスカーに成長させるのに長時
間の加熱が必要になる。If the temperature at which the alumina fibrous crystal is formed is not in the range of 800 to 1000 ° C., a fibrous crystal having a large aspect ratio cannot be obtained. A particularly preferable temperature for obtaining a large aspect ratio is 850 to 950 ° C.
At 850 ° C., 10 hours or more, and at 950 ° C., 2 hours or more are sufficient. At 1000 ° C. or higher, the oxide film tends to become a nearly flat oxide film with small unevenness, and the specific surface area of the formed oxide film is too small to be suitable for collecting. On the other hand, if the temperature is lower than 800 ° C., the progress of oxidation is delayed due to the delay of atomic diffusion, and a long time of heating is required to grow a desired whisker.
【００１７】[0017]
【実施例】以下に、この発明の具体例を示す。The following is a specific example of the present invention.
【００１８】（実験例１）Ｎｉ目付け量１１００ｇ／ｍ
2 のＮｉ製三次元網状金属多孔体を拡散浸透法で合金化
処理してＮｉ−Ｃｒ（２５重量％）−Ａｌ（６重量％）
の三次元網状金属多孔体となし、次に、これを大気中８
７５℃で５時間加熱して骨格表面にアルミナ繊維状結晶
のできたフィルタ材（発明品１）を得た。(Experimental example 1) Ni basis weight 1100 g / m
(2 ) Ni-Cr (25 wt%)-Al (6 wt%)
A three-dimensional reticulated metal porous body,
By heating at 75 ° C. for 5 hours, a filter material (invention 1) having alumina fibrous crystals on the skeleton surface was obtained.
【００１９】また、比較のため、発明品１と同じ方法で
合金化した同一組成の三次元網状金属多孔体を大気中１
０００℃で３時間加熱したもの（比較品１）も作った。
これ等の骨格表面の走査型電子顕微鏡写真を熱処理前の
骨格表面状況写真（図１）と併せて図２、図３に示す。
図２から判るように、発明品１の骨格表面には、約３μ
ｍ長さのアルミナの繊維状結晶が密に生成しているが、
比較品１の骨格表面には図３に示すように繊維状結晶は
見られず、粒状結晶ができている。For comparison, a three-dimensional reticulated metal porous body of the same composition alloyed by the same method as the invention 1 was used in air 1
A product heated at 000 ° C. for 3 hours (Comparative product 1) was also prepared.
Scanning electron micrographs of these skeleton surfaces are shown in FIGS. 2 and 3 along with photographs of the skeleton surface before heat treatment (FIG. 1).
As can be seen from FIG. 2, about 3 μm
Although m-length alumina fibrous crystals are densely formed,
As shown in FIG. 3, no fibrous crystals were found on the skeleton surface of Comparative Product 1, and granular crystals were formed.
【００２０】次に、これ等の試料について、排気ガス中
の固体（特に、ディーゼルエンジン車から排出されるす
す等）及び液体成分の捕集能力を試験して調べたとこ
ろ、発明品１の能力が比較品１のそれよりもはるかに優
れていた。Next, these samples were tested for their ability to collect solids (especially soot and the like discharged from diesel engine vehicles) and liquid components in the exhaust gas. Was much better than that of Comparative Product 1.
【００２１】（実験例２）Ｎｉ目付け量１１００ｇ／ｍ
2 のＮｉ製三次元網状金属多孔体を拡散浸透法で合金化
処理して表１の組成となし、次いで、この金属多孔体を
大気中にて同表の熱処理条件で加熱し、発明品２〜９の
フィルタ材を得た。(Experimental Example 2) Ni basis weight 1100 g / m
2 was alloyed by a diffusion infiltration method to obtain the composition shown in Table 1. Then, this metal porous body was heated in the air under the heat treatment conditions shown in Table 1 to obtain the invention 2 ~ 9 filter materials were obtained.
【００２２】比較のため、発明品２〜９に用いたものと
同一組成の三次元網状金属多孔体を８００℃以下或いは
１０００℃以上の温度で加熱した比較品２〜９も作成し
た。For comparison, comparative products 2 to 9 were prepared by heating a three-dimensional reticulated metal porous body having the same composition as those used in invention products 2 to 9 at a temperature of 800 ° C. or lower or 1000 ° C. or higher.
【００２３】また、Ｙ或いはＮｄの添加量を０．５重量
％以上にして熱処理条件は発明品と同じにした別の比較
品も作った。Further, another comparative product was prepared in which the addition amount of Y or Nd was 0.5% by weight or more and the heat treatment conditions were the same as those of the invention product.
【００２４】[0024]
【表１】 発明品２〜９には、いずれも発明品１に見られた繊維状
結晶が骨格表面に生成されているが、比較品２〜９には
このような結晶は無く、平滑な結晶しか見られなかっ
た。[Table 1] In the invention products 2 to 9, all of the fibrous crystals found in the invention product 1 are formed on the skeleton surface, but in the comparison products 2 to 9 there are no such crystals, and only smooth crystals are seen. Did not.
【００２５】また、Ｙ、Ｎｄの含有量を０．５重量％以
上にしたものは、熱処理条件が本発明品と同じであるに
も拘らず、繊維長の短い結晶になっており、Ｙ、Ｎｄの
過剰添加は結晶の成長をかえって阻害することが判っ
た。[0025] Further, in the case where the content of Y and Nd is 0.5% by weight or more, the crystal is short in fiber length, despite the heat treatment conditions being the same as those of the product of the present invention. It has been found that excessive addition of Nd rather inhibits crystal growth.
【００２６】次に、発明品２〜９を用いて、１０００
℃、３０分加熱−冷却のサイクルを５００回加えたが、
特に問題となる欠損や外観の変化はなかった。この実験
は、排ガス中の固体（すす等）、液体成分を捕集したフ
ィルタを定期的に燃焼クリーニング等で再生することを
モデル化したものであって、耐熱性について問題の無い
性能を持たし得ることが証明された。Next, using invention products 2 to 9, 1000
℃, 30 minutes heating-cooling cycle was added 500 times,
There were no particularly problematic defects or changes in appearance. This experiment models a filter that collects solids (soot, etc.) and liquid components in the exhaust gas, and periodically regenerates the filter by combustion cleaning, etc., and has performance with no problem in terms of heat resistance. Proven to get.
【００２７】また、固体成分の捕集性能を調べるため
に、発明品１〜９と、比較品１〜９を用いて実際に２８
００ｃｃディーゼルエンジン車の排ガス中の「すす」を
捕集した結果、比較品に比べて本発明の方が短時間で所
定の捕集率に達した。Further, in order to examine the trapping performance of solid components, the invention products 1 to 9 and the comparison products 1 to 9 were actually used to measure the solid components.
As a result of collecting "soot" in the exhaust gas of the 00cc diesel engine vehicle, the present invention reached the predetermined collection rate in a shorter time than the comparative product.
【００２８】また、これ等の試料を用いて同一構造のフ
ィルタを作り、２６００ｒｐｍ、３／４負荷の状態で発
生した「すす」の捕集を試みた結果、５時間捕集での捕
集量は、比較品を１とした場合、対応する発明品の量は
２〜５倍に達し、捕集能力にも優れていることが確認さ
れた。Using these samples, a filter having the same structure was prepared, and the soot generated at a load of 2600 rpm and a load of 3/4 was tried. As a result, the amount collected in 5 hours was collected. When the comparative product was set to 1, the amount of the corresponding invention product reached 2 to 5 times, and it was confirmed that the product had an excellent trapping ability.
【００２９】[0029]
【発明の効果】以上述べたように、この発明のフィルタ
材は、熱に強いＮｉ−Ｃｒ−Ａｒ系合金等で作られた三
次元網状金属多孔体の三次元骨格表面にアルミナ繊維状
結晶を生成したものであるから、排ガス中の固体、液体
成分の捕集性能が優れるだけでなく、高温下での加熱冷
却の繰り返しによる温度変化にも十分に耐え、燃焼クリ
ーニング等による再生をコストをかけずに容易に実施で
きるようになる。As described above, according to the filter material of the present invention, alumina fibrous crystals are formed on the surface of a three-dimensional skeleton of a three-dimensional network porous metal body made of a heat-resistant Ni-Cr-Ar alloy or the like. Because it is produced, it not only excels in solid and liquid component collection performance in exhaust gas, but also withstands temperature changes due to repeated heating and cooling at high temperatures, and costs for regeneration by combustion cleaning etc. Can be easily implemented.
【図１】Ｎｉ−Ｃｒ（２５重量％）−Ａｌ（６重量％）
系の三次元網状金属多孔体の骨格表面状況を示す走査型
電子顕微鏡写真。FIG. 1—Ni—Cr (25% by weight) —Al (6% by weight)
Scanning electron micrograph showing the state of the skeleton surface of a three-dimensional reticulated porous metal body.
【図２】図１の三次元網状金属多孔体を用いて作られた
この発明のフィルタ材の骨格表面の走査型電子顕微鏡写
真。FIG. 2 is a scanning electron micrograph of a skeleton surface of the filter material of the present invention made using the three-dimensional porous metal body of FIG.
【図３】図１の三次元網状金属多孔体を用いて作られた
比較フィルタ材の骨格表面の走査型電子顕微鏡写真。FIG. 3 is a scanning electron micrograph of a skeleton surface of a comparative filter material made using the three-dimensional network porous metal body of FIG. 1;
フロントページの続き (72)発明者 坂 俊祐 伊丹市昆陽北一丁目１番１号 住友電気 工業株式会社伊丹製作所内 (56)参考文献 特開 平４−124419（ＪＰ，Ａ) 特開 平５−312017（ＪＰ，Ａ) 特開 平１−159014（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B01D 39/00 - 39/20 Continuation of the front page (72) Inventor Shunsuke Saka 1-1-1, Kunyokita, Itami-shi Itami Works, Sumitomo Electric Industries, Ltd. (56) References JP-A-4-124419 (JP, A) JP-A-5- 312017 (JP, A) JP-A-1-159014 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B01D 39/00-39/20
Claims (5)
孔体の三次元骨格表面に、アルミナ繊維状結晶を有して
いるフィルタ材。1. A filter material having alumina fibrous crystals on the surface of a three-dimensional skeleton of a Ni-Cr-Al-based three-dimensional network porous metal body.
格表面から深さ０．５μｍまでのＡｌ濃度が５重量％以
上であるものを用いた請求項１記載のフィルタ材。2. The filter material according to claim 1, wherein the three-dimensional porous metal body has an Al concentration of 5% by weight or more from the surface of the three-dimensional skeleton to a depth of 0.5 μm.
５〜４０重量％、Ａｌ：１〜８重量％、残部：Ｎｉ及び
不可避成分から成るものを用いた請求項１記載のフィル
タ材。3. A three-dimensional mesh-like porous metal material, comprising: Cr: 1
The filter material according to claim 1, wherein 5 to 40% by weight, Al: 1 to 8% by weight, balance: Ni and inevitable components are used.
記載の多孔体に更にイットリウム、ネオジウム等の希土
類元素の１種もしくは２種以上を０．０５〜０．５重量
％含有させたものを用いた請求項１記載のフィルタ材。4. A three-dimensional reticulated porous metal body.
2. The filter material according to claim 1, wherein said porous material further contains 0.05 to 0.5% by weight of one or more rare earth elements such as yttrium and neodymium.
８００〜１０００℃に加熱して前記アルミナ繊維状結晶
を生じさせてある請求項２乃至４のいずれかに記載のフ
ィルタ材。5. The method according to claim 5, wherein the three-dimensional mesh-like porous metal body is
The filter material according to any one of claims 2 to 4, wherein the alumina fibrous crystal is generated by heating to 800 to 1000C.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27113792A JP3211408B2 (en) | 1992-09-14 | 1992-09-14 | Filter material |
| EP93919657A EP0626188A4 (en) | 1992-09-14 | 1993-09-13 | Exhaust gas cleaning filter medium and method of manufacturing the same. |
| PCT/JP1993/001308 WO1994006538A1 (en) | 1992-09-14 | 1993-09-13 | Exhaust gas cleaning filter medium and method of manufacturing the same |
| US08/390,995 US5830415A (en) | 1992-09-14 | 1995-02-21 | Filter member for purifying exhaust gas and method for manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27113792A JP3211408B2 (en) | 1992-09-14 | 1992-09-14 | Filter material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06190221A JPH06190221A (en) | 1994-07-12 |
| JP3211408B2 true JP3211408B2 (en) | 2001-09-25 |
Family
ID=17495835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27113792A Expired - Lifetime JP3211408B2 (en) | 1992-09-14 | 1992-09-14 | Filter material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3211408B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006130463A (en) * | 2004-11-09 | 2006-05-25 | Nissan Motor Co Ltd | Purification filter, production method for the same, and exhaust gas purification apparatus |
| CN106865925B (en) * | 2017-02-28 | 2023-05-09 | 成都易态科技有限公司 | Dewatering device with spiral filtering surface |
-
1992
- 1992-09-14 JP JP27113792A patent/JP3211408B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06190221A (en) | 1994-07-12 |
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