JPH06190221A - Filter medium - Google Patents
Filter mediumInfo
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- JPH06190221A JPH06190221A JP27113792A JP27113792A JPH06190221A JP H06190221 A JPH06190221 A JP H06190221A JP 27113792 A JP27113792 A JP 27113792A JP 27113792 A JP27113792 A JP 27113792A JP H06190221 A JPH06190221 A JP H06190221A
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Abstract
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 trying to develop filter systems. A filter using ceramics has excellent trapping performance, but has a drawback that heat spots are likely to be formed during regeneration and combustion when removing the trapped fine particles, and melting loss and cracking due to thermal stress are likely to occur. For this reason, complex control systems are needed.
【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。Diesel engine vehicles have low fuel consumption and are more marketable than gasoline vehicles, but if the cost of exhaust gas treatment is high, the advantages cannot be fully utilized. For this reason, there is a demand for a filter material that has excellent collection 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。The present invention is intended to provide a filter material that meets 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 problems, the present invention provides a heat-resistant material, preferably Ni-
The three-dimensional skeleton surface of the three-dimensional reticulated metal porous body made of a Cr-Al-based material was provided with alumina fibrous crystals to be 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 has a three-dimensional reticulated metal porous body in the atmosphere or in an oxidizing gas atmosphere when the three-dimensional reticulated metal porous body is of Ni-Cr-Al type. It can be easily produced by high temperature oxidation at 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。The Ni-Cr-Al-based three-dimensional reticulated metal porous body is, for example, a Ni three-dimensional reticulated metal porous body with Cr,
It is obtained by diffusing and permeating Al to form an alloy. This porous body has a composition of Cr: 15 to 40% by weight and Al: 1
.About.8 wt%, balance: Ni and diffusion infiltration treatment conditions (powder composition, powder amount, temperature, time) so as to be inevitable components. Further, in this composition, one or more rare earth elements such as yttrium and neodymium may be further added to the composition of 0.
When it is contained in an amount of 05 to 0.5% by weight, it 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 therefore can withstand a high temperature of 1000 ° C. or higher. The alumina fibrous crystals on the surface of the three-dimensional skeleton improve the smoothness of the surface of the three-dimensional skeleton, and the solid or liquid component in the exhaust gas is strongly collected on the surface of the three-dimensional skeleton. In addition, the three-dimensional reticulated metal porous body in which Al is alloyed with Cr forms a stable oxide having a strong resistance to sulfur and sulfuric acid components, and therefore has good corrosion resistance to exhaust gas from automobiles.
【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 the components in the Ni-Cr-Al-based three-dimensional network metal porous body will be 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。Cr is a basic element that ensures heat resistance and oxidation resistance. In the present invention, alumina (Al
The 2 O 3 ) film mainly serves to secure the oxidation resistance, but when Cr is deficient, the adhesion and protection of the film are deteriorated and there is a problem in maintaining the oxidation resistance. On the other hand, when Cr is excessive, the toughness is lowered, so that the Cr content is defined as 15 to 40% by weight as a range in which these problems can be eliminated together.
【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 to contain Al in an amount of 1% by weight. If Al is less than 1% by weight, the effect of improving heat resistance is small. Further, it is not preferable to contain 8% by weight or more in terms of processability, and therefore,
The content thereof is set to 1 to 8% by weight, and an appropriate value is selected from them in consideration of the workability requirement.
【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 (ratio of length to thickness) of the alumina fibrous crystal, the Al concentration from the skeleton surface 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 permeation treatment called a chromizing treatment. After forming it into a body, then molding it into a pipe shape, and then performing a two-stage alloying treatment of calorizing treatment,
The three-dimensional net-like metal porous body of pure Ni can be first formed into a pipe shape, and then can be produced by a one-step alloying treatment in which Cr and Al are simultaneously diffused and permeated. Depending on the treatment conditions, the amount of Al alloy near the skeleton surface can be increased to further improve the heat resistance of the surface. However, also in this case, the proportion of Al in the entire alloy composition is limited to 1% by weight to a maximum of 8% by weight, and with the addition of more than this, even if the surface of the molded body is chipped due to vibration impact, toughness I cannot guarantee.
【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 permeated at an arbitrary depth from the surface to the inside of the skeleton by controlling the diffusion time during the caroline treatment, so that the skeleton surface maintains a high Al concentration in which crystals easily grow into fibrous shapes. On the other hand, it is desirable to diffuse the inside of the skeleton so that the amount of Al (1% by weight) required to maintain heat resistance is obtained.
【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。If the rare earth element such as yttrium or neodymium described above is contained in the Ni-Cr-Al-based three-dimensional network metal porous body, the heat resistance is further enhanced. The rare earth element may be added by mixing the powder of the element to be added into the diffusion penetrant during chromizing, calorizing, or one-step alloying. Addition hinders the formation of fibrous crystals in the subsequent step, and if it is 0.05% by weight or less, the effect of improving heat resistance does not appear.
【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 alumina fibrous crystals are formed is not in the range of 800 to 1000 ° C., fibrous crystals having a large aspect ratio cannot be obtained. Particularly preferable temperature for obtaining a material having a large aspect ratio is 850 to 950 ° C.
That is, 10 hours or more at 850 ° C. and 2 hours or more at 950 ° C. are sufficient. At 1000 ° C. or higher, a nearly flat oxide film with small irregularities is likely to be formed, and the specific surface area of the produced oxide film is too small, which is not suitable for the role of collection. 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 long-time 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 are specific examples 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
Ni-Cr (25% by weight) -Al (6% by weight) was alloyed with the Ni three-dimensional reticulated metal porous body of No. 2 by the diffusion and infiltration method.
3D reticulated metal porous body of
By heating at 75 ° C. for 5 hours, a filter material (invention product 1) having alumina fiber-like 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 invented product 1 was used in air 1
A product (comparative product 1) heated at 000 ° C. for 3 hours was also prepared.
Scanning electron micrographs of these skeleton surfaces are shown in FIGS. 2 and 3 together with a skeleton surface condition photograph (FIG. 1) before heat treatment.
As can be seen from FIG. 2, about 3 μm is present on the skeleton surface of the invention product 1.
Although fibrous crystals of m-length alumina are densely formed,
As shown in FIG. 3, fibrous crystals were not found on the skeleton surface of Comparative product 1, but 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 and examined for their ability to collect solids (particularly soot 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 of the Ni-made three-dimensional network metal porous body without the composition of Table 1 was treated alloyed cementation method, then, the porous metal body is heated in heat treatment conditions of the same table in the atmosphere, the invention product 2 .About.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 that used in the 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。Another comparative product was also prepared in which the amount of Y or Nd added 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 each of the invention products 2 to 9, the fibrous crystals found in the invention product 1 were formed on the skeleton surface, but in the comparative products 2 to 9, there was no such crystal, and only smooth crystals were found. There wasn't.
【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。Further, the Y and Nd contents of 0.5% by weight or more are crystals having a short fiber length, although the heat treatment conditions are the same as those of the product of the present invention. It was found that excessive addition of Nd rather hinders 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 the invention products 2 to 9, 1000
℃, 30 minutes heating-cooling cycle was added 500 times,
There were no particular defects or changes in appearance. This experiment is a model of periodically regenerating a filter that collects solids (soot, etc.) and liquid components in the exhaust gas by combustion cleaning, etc., and has no problem with heat resistance. Proved 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 collection performance of the solid component, the invention products 1 to 9 and the comparative products 1 to 9 were actually used.
As a result of collecting "soot" in the exhaust gas of a 00cc diesel engine vehicle, the present invention reached a 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。Further, a filter having the same structure was prepared using these samples, and an attempt was made to collect "soot" generated at a load of 2600 rpm and 3/4. It was confirmed that when the comparative product was 1, the amount of the corresponding invention product reached 2 to 5 times, and the collection ability was excellent.
【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, the filter material of the present invention has alumina fibrous crystals on the surface of the three-dimensional skeleton of the three-dimensional network metal porous body made of a heat resistant Ni-Cr-Ar type alloy or the like. Since it is produced, it not only excels in the ability to collect solid and liquid components in exhaust gas, but also withstands temperature changes due to repeated heating and cooling at high temperatures, and regenerates by combustion cleaning etc. at a high cost. It can be easily implemented without the need.
【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 wt%)-Al (6 wt%)
Scanning electron micrograph showing the skeleton surface condition of the three-dimensional reticulated metal porous body of the system.
【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。2 is a scanning electron micrograph of the skeleton surface of the filter material of the present invention made using the three-dimensional reticulated metal porous 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 reticulated metal porous body of FIG.
───────────────────────────────────────────────────── 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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shunsuke Saka, 1-1 1-1 Kunyokita, Itami City Sumitomo Electric Industries Itami Works Co., Ltd.
Claims (4)
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 three-dimensional reticulated metal porous body.
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。2. A three-dimensional reticulated metal porous body comprising Cr: 1
The filter material according to claim 1, which comprises 5 to 40% by weight, Al: 1 to 8% by weight, the balance: Ni and an unavoidable component.
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。3. A three-dimensional reticulated metal porous body as claimed in claim 2.
The filter material according to claim 1, wherein the porous body described above 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又は３記載のフィルタ材。4. The three-dimensional reticulated metal porous body in the atmosphere,
The filter material according to claim 2 or 3, wherein the alumina fibrous crystals are produced by heating at 800 to 1000 ° C.
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 true JPH06190221A (en) | 1994-07-12 |
| JP3211408B2 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) |
Cited By (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 |
| CN106865925A (en) * | 2017-02-28 | 2017-06-20 | 成都易态科技有限公司 | Dehydration device with spiral filtration face |
-
1992
- 1992-09-14 JP JP27113792A patent/JP3211408B2/en not_active Expired - Lifetime
Cited By (3)
| 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 |
| CN106865925A (en) * | 2017-02-28 | 2017-06-20 | 成都易态科技有限公司 | Dehydration device with spiral filtration face |
| CN106865925B (en) * | 2017-02-28 | 2023-05-09 | 成都易态科技有限公司 | Dewatering device with spiral filtering surface |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3211408B2 (en) | 2001-09-25 |
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