JP4024318B2 - High durability metal carrier for exhaust gas purification - Google Patents
High durability metal carrier for exhaust gas purification Download PDFInfo
- Publication number
- JP4024318B2 JP4024318B2 JP02323295A JP2323295A JP4024318B2 JP 4024318 B2 JP4024318 B2 JP 4024318B2 JP 02323295 A JP02323295 A JP 02323295A JP 2323295 A JP2323295 A JP 2323295A JP 4024318 B2 JP4024318 B2 JP 4024318B2
- Authority
- JP
- Japan
- Prior art keywords
- metal
- honeycomb body
- exhaust gas
- metal carrier
- foil
- 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
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- 239000002184 metal Substances 0.000 title claims description 35
- 229910052751 metal Inorganic materials 0.000 title claims description 35
- 238000000746 purification Methods 0.000 title claims description 5
- 239000011888 foil Substances 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052715 tantalum Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 description 4
- 230000035882 stress Effects 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000873 masking effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000005219 brazing Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Catalysts (AREA)
- Exhaust Gas After Treatment (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は内燃機関などのエンジンから排出される排気ガスを浄化するために、その排ガス系に設置するところの、高耐久性を有する触媒用メタル担体に関するものである。
【０００２】
【従来の技術】
自動車あるいは２輪車のエンジン排気ガスを浄化するために設置する触媒担体は、近時、メタル製担体が用いられるようになってきている。
メタル担体は耐熱性金属よりなる平箔と、これを波状に加工した波箔とを重ね合わせ、渦巻状に巻回積層してなるハニカム体を、耐熱性金属よりなる外筒に挿入して構成され、そして、平箔と波箔、及びハニカム体と外筒とは主としてロウ材で接合されている。かかるハニカム体にはＰｔ等の触媒金属が担持され、これが排気ガスと接触しガス成分を浄化する。
【０００３】
自動車あるいは２輪車の排ガス系に設置されたメタル担体は、運転中の振動に耐えるために、ハニカム体を構成する平箔と波箔、及びハニカム体と外筒を適宜接合しなければならない。また、ハニカム体は高温の排気ガスに直接接触し、さらに触媒反応による発熱のために高温になるが、外筒は外気に露されて放熱されるため、外筒及び外筒近傍のハニカム体は比較的に低温となる。すなわち、メタル担体の中央部は温度が高く、従って半径方向の内−外部に温度差に基づく熱応力が発生し、肉厚が厚い外筒とハニカム体とが一体に接合されている場合には、強度的に弱い外筒近傍のハニカム体が熱歪みにより損傷を起こすことがある。
【０００４】
この様な損傷の発生を防ぐために、実開平２−２５０２８号公報にはコア部の環状部材の内周部及びこの近傍に位置する部分において、平板（箔）重ね巻きをすることが開示され、また、特開平５−２００３０９号公報には、ハニカム担体の前端部に所定の長さにわたって撥水性マスキング剤を塗布したのち、該担体をコーティング液に浸漬し、触媒を含浸させてなり、ハニカム体前端部から所定の長さにわたって触媒が露出していない部分を構成した触媒メタル担体で、繰り返し作用する熱応力を減らし、亀裂の発生を防ぐことを開示している。
【０００５】
しかし、前者の平箔を２枚重ね巻きする場合には平箔間の接合を確実に行うのは難しいという問題があり、後者の撥水性マスキング処理を行うことは、通常の製造工程に対して工程が付加され、コスト負担が大きくなると共にマスキング剤の剥離等実用面での問題が残る。
【０００６】
ハニカム体の損傷は、外筒に拘束されたハニカム体に作用する熱歪みに基づくものであり、例えば図２に示すように、可撓性のある波箔２より平箔１にかかる圧縮応力により分断３という形で亀裂が発生する。
【０００７】
【発明が解決しようとする課題】
本発明はこの様な従来の問題を解消しようとするものであって、ハニカム体を箔強度の異なる素材で、通常の製造工程を適用して製造し、平箔の圧縮応力に対して十分な強度を有し、損傷の発生しない高耐久性の排気ガス浄化用メタル担体を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記目的を達成するために本発明は、
（１）板厚が同じであり、かつ連続する金属製平箔と金属製波箔とを交互に巻回積層して形成されるハニカム体を、金属製の外筒に挿入し、適宜接合されて構成されるメタル担体において、ハニカム体を構成する前記平箔の６００℃における高温引張強度σ1と前記波箔の６００℃における高温引張強度σ2とがσ1＞σ2となるように構成したことを特徴とする排気ガス浄化用高耐久性メタル担体であり、また、
（２）ハニカム体を構成する金属箔素材元素に、Ｍｏ，Ｔａ，Ｗ，Ｖ，Ｎｂの少なくとも１種を含むことを特徴とする前記（１）記載の排気ガス浄化用高耐久性メタル担体である。
【０００９】
【作用】
以下本発明を詳細に説明する。
ハニカム体を構成する波箔は金属製平箔を一定のピッチを有する波に加工したものであり、この波板と平板を重ね合わせて巻回しハニカム体に形成する。この際、波箔山部（谷部）の頂部は平箔の面に接触する。ハニカム体を外筒に挿入して構成するメタル担体を排気ガス系に配置し使用する時に、ハニカム体がテレスコープ状に飛び出さないように波箔と平箔の接触部は接合しなければならず、通常はロウ接合が行われる。
【００１０】
本発明はこの様なハニカム体の構成において、熱応力の影響を大きく受け、破断しやすい平箔の引張強度を大きくする。すなわち、図１に示すようにハニカム体における平箔１の高温引張強度σ1 と波箔２の高温引張強度σ2 との関係においてσ1 ＞σ2 となるように構成することにより、図３に示すような平箔の破断を防止する。
【００１１】
ここで高温引張強度とは、メタル担体が高温の排気ガスにさらされた時の引張強度であって、通常６００℃近辺における強度を基準にする。
この様な高温強度を付与するには、素材に固溶強化型の元素Ｍｏ，Ｔａ，Ｗ等を加えたり、析出強化型の元素Ｖ，Ｎｂ等を加えることで各種強度の箔が得られる。
【００１３】
【実施例】
表１に示す厚さと６００℃での高温引張強度を持つ平箔と波箔を用い、波箔は波高さ１．２５mm、波ピッチ２．５mmとし、これを平箔と重ねて巻回して直径１００．３mmのハニカム体を制作した。このハニカム体を板厚１．５mm、内径１００mmの金属製外筒に圧入し、図３に示すような直径１００．３mm、長さ１０３mmのメタル担体とした。
【００１４】
表１に示す各メタル担体の耐久性の評価として２０００ccのエンジンを用い、試験メタル担体を、その入り口でガス温度８５０℃×１０分間加熱し、その後常温間で冷却するサイクルを１０００サイクル実施した。
結果を表１に併記した。
【００１５】
【表１】
【発明の効果】
以上のように本発明は、ハニカム体を箔強度の異なる素材で、通常の製造工程を適用して製造し、平箔の圧縮応力に対して十分な強度を有し、損傷の発生しない耐久性の高いメタル担体を簡単に、かつ低コストで提供できる。
【図面の簡単な説明】
【図１】本発明のハニカム体の一部断面を示す説明図である。
【図２】従来のハニカム体の一部を示す説明図である。
【図３】メタル担体の斜視面を示す。
【符号の説明】
１：平箔
２：波箔
３：破断部（亀裂）
４：ハニカム体
５：外筒
６：メタル担体[0001]
[Industrial application fields]
The present invention relates to a highly durable metal support for a catalyst which is installed in an exhaust gas system in order to purify exhaust gas discharged from an engine such as an internal combustion engine.
[0002]
[Prior art]
Recently, metal carriers have been used as catalyst carriers installed to purify engine exhaust gas of automobiles or two-wheeled vehicles.
The metal carrier consists of a flat foil made of a heat-resistant metal and a corrugated foil foil processed into a corrugated shape, and a honeycomb body formed by spirally winding and stacking is inserted into an outer tube made of a heat-resistant metal. The flat foil and the corrugated foil, and the honeycomb body and the outer cylinder are joined mainly by brazing material. Such a honeycomb body carries a catalytic metal such as Pt, which contacts the exhaust gas and purifies the gas component.
[0003]
In order to withstand vibration during operation, a metal carrier installed in an exhaust gas system of an automobile or a two-wheeled vehicle must appropriately join a flat foil and a wave foil constituting the honeycomb body, and a honeycomb body and an outer cylinder. In addition, the honeycomb body is in direct contact with the high-temperature exhaust gas and further becomes high temperature due to heat generated by the catalytic reaction, but since the outer cylinder is exposed to the outside air and dissipated, the outer cylinder and the honeycomb body in the vicinity of the outer cylinder are Relatively low temperature. That is, when the temperature of the central portion of the metal carrier is high and thermal stress based on the temperature difference is generated between the inner and outer sides in the radial direction, and the thick outer cylinder and the honeycomb body are joined together. The honeycomb body near the outer cylinder, which is weak in strength, may be damaged by thermal distortion.
[0004]
In order to prevent the occurrence of such damage, Japanese Utility Model Laid-Open No. 2-25028 discloses that a flat plate (foil) is wound on the inner peripheral portion of the annular member of the core portion and a portion located in the vicinity thereof, Japanese Patent Laid-Open No. 5-200309 discloses a honeycomb body in which a water repellent masking agent is applied to a front end portion of a honeycomb carrier over a predetermined length, and then the carrier is immersed in a coating solution and impregnated with a catalyst. It discloses that a catalytic metal carrier that forms a portion where a catalyst is not exposed over a predetermined length from the front end portion reduces thermal stress that repeatedly acts and prevents the occurrence of cracks.
[0005]
However, there is a problem that it is difficult to surely join the flat foils when the former flat foils are rolled up two times. A process is added, the cost burden increases, and problems such as peeling of the masking agent remain in practical use.
[0006]
The damage to the honeycomb body is based on the thermal strain acting on the honeycomb body constrained by the outer cylinder. For example, as shown in FIG. 2, the honeycomb body is damaged by the compressive stress applied to the flat foil 1 from the flexible
[0007]
[Problems to be solved by the invention]
The present invention has been made to attempt to solve such conventional problems, the honeycomb body with different materials of Hakukyo degree, prepared by applying the normal production process, sufficient for compressive stress of the flat foil An object of the present invention is to provide a highly durable exhaust gas purifying metal carrier that has high strength and does not cause damage.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides:
(1) A honeycomb body formed by alternately winding and laminating continuous metal flat foils and metal corrugated foils with the same plate thickness is inserted into a metal outer tube and appropriately joined. in the metal carrier configured Te, that the high-temperature tensile strength .sigma. @ 2 definitive to 600 ° C. of the corrugated sheet and high-temperature tensile strength .sigma.1 at 600 ° C. of the flat foil constituting a honeycomb body is configured such that .sigma.1> .sigma. @ 2 It is a highly durable metal carrier for exhaust gas purification characterized by
(2) to the metal foil material element constituting the honeycomb bodies, Mo, Ta, W, V , in the (1) high durability metal carrier for exhaust gas purification according to, characterized in that it comprises at least one Nb is there.
[0009]
[Action]
The present invention will be described in detail below.
The corrugated foil constituting the honeycomb body is obtained by processing a flat metal foil into a wave having a constant pitch. The corrugated sheet and the flat plate are overlapped and wound to form a honeycomb body. At this time, the top of the corrugated ridge (valley) is in contact with the surface of the flat foil. When using a metal carrier constructed by inserting the honeycomb body into the outer cylinder in the exhaust gas system, the contact part between the corrugated foil and the flat foil must be joined so that the honeycomb body does not jump out into a telescope shape. In general, the solder bonding is performed.
[0010]
In the structure of such a honeycomb body, the present invention is greatly affected by thermal stress and increases the tensile strength of a flat foil that is easily broken. That is, as shown in FIG. 3, by configuring so that σ1> σ2 in the relationship between the high temperature tensile strength σ1 of the flat foil 1 and the high temperature tensile strength σ2 of the
[0011]
Here, the high temperature tensile strength is the tensile strength when the metal carrier is exposed to high temperature exhaust gas, and is usually based on the strength around 600 ° C.
In order to provide such high temperature strength, foils of various strengths can be obtained by adding solid solution strengthening elements Mo, Ta, W, etc., or adding precipitation strengthening elements V, Nb, etc. to the material.
[0013]
【Example】
The flat foil and corrugated foil having the thickness shown in Table 1 and the high-temperature tensile strength at 600 ° C. are used. The corrugated foil has a wave height of 1.25 mm and a wave pitch of 2.5 mm. A 100.3 mm honeycomb body was produced. This honeycomb body was press-fitted into a metal outer cylinder having a plate thickness of 1.5 mm and an inner diameter of 100 mm to obtain a metal carrier having a diameter of 100.3 mm and a length of 103 mm as shown in FIG.
[0014]
As an evaluation of the durability of each metal carrier shown in Table 1, a 2000 cc engine was used, and the test metal carrier was heated at the inlet at a gas temperature of 850 ° C. for 10 minutes and then cooled at room temperature for 1000 cycles.
The results are also shown in Table 1.
[0015]
[Table 1]
【The invention's effect】
Durable present invention, as described above, the honeycomb body with different materials of Hakukyo degree, prepared by applying the normal production process, have a sufficient strength against compression stress of the flat foil, causing no damage A highly functional metal carrier can be provided easily and at low cost.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a partial cross section of a honeycomb body of the present invention.
FIG. 2 is an explanatory view showing a part of a conventional honeycomb body.
FIG. 3 shows a perspective view of a metal carrier.
[Explanation of symbols]
1: Flat foil 2: Corrugated foil 3: Broken part (crack)
4: Honeycomb body 5: Outer cylinder 6: Metal carrier
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02323295A JP4024318B2 (en) | 1995-02-10 | 1995-02-10 | High durability metal carrier for exhaust gas purification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02323295A JP4024318B2 (en) | 1995-02-10 | 1995-02-10 | High durability metal carrier for exhaust gas purification |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08215582A JPH08215582A (en) | 1996-08-27 |
| JP4024318B2 true JP4024318B2 (en) | 2007-12-19 |
Family
ID=12104881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02323295A Expired - Lifetime JP4024318B2 (en) | 1995-02-10 | 1995-02-10 | High durability metal carrier for exhaust gas purification |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4024318B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101988343B1 (en) * | 2013-03-05 | 2019-06-12 | 한온시스템 주식회사 | Blower unit for vehicle |
-
1995
- 1995-02-10 JP JP02323295A patent/JP4024318B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08215582A (en) | 1996-08-27 |
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