JPH053342B2 - - Google Patents
Info
- Publication number
- JPH053342B2 JPH053342B2 JP61153854A JP15385486A JPH053342B2 JP H053342 B2 JPH053342 B2 JP H053342B2 JP 61153854 A JP61153854 A JP 61153854A JP 15385486 A JP15385486 A JP 15385486A JP H053342 B2 JPH053342 B2 JP H053342B2
- Authority
- JP
- Japan
- Prior art keywords
- alumina
- metal catalyst
- corrugated plate
- catalyst carrier
- flat plate
- 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 35
- 229910052751 metal Inorganic materials 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 21
- 239000003054 catalyst Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 19
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 239000002243 precursor Substances 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 238000005219 brazing Methods 0.000 description 16
- 238000003466 welding Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 8
- 238000007796 conventional method Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Description
〔産業上の利用分野〕
本発明は、排気ガスの浄化を行なうメタル触媒
コンバータ等で用いられる金属触媒担体の製造方
法に関する。
〔従来の技術〕
一般に、排気ガスの浄化を行なうメタル触媒コ
ンバータ等では、例えば、特開昭56−96726号公
報に開示されるような金属触媒担体が用いられて
いる。
第２図は、この種の金属触媒担体を示すもの
で、この金属触媒担体は、アルミニウムを含むフ
エライト系ステンレスからなる基材１１の表面
に、いわゆる耐スポーリング性を向上するため、
熱処理を施すことによりアルミニウムの拡散によ
るアルミナウイスカ層１３が形成されている。こ
こで、基材１１としては、例えば、Fe−20Cr−
5Alの合金が用いられている。また、アルミナウ
イスカ層１３は、α−Al2O3からなる。
さらに、このアルミナウイスカ層１３の表面に
は、触媒担持アルミナ層１５が形成され、この触
媒担持アルミナ層１５には、金属触媒１７が含浸
されている。ここで、触媒担持アルミナ層１５
は、例えば、γ−Al2O3からなる。また、金属触
媒１７には、Pt，Rh等が用いられる。
第３図には、このような金属触媒担体の従来の
製造方法を示すもので、この金属触媒担体の製造
方法では、まず、アルミニウムを含むフエライト
系ステンレスからなる素材に、予め、アルミナウ
イスカの前駆体を形成するための予備処理が行な
われる。この予備処理は、例えば800℃の低酸素
雰囲気中で１分程度加熱することにより行なわれ
る。
これは、アルミナを生成する際、アルミナをウ
イスカ状に効率よく成長させるためには、まず、
低い酸化雰囲気で加熱して極く薄いアルミナ被膜
を形成し、その後十分な酸化雰囲気で加熱して酸
化を行なうという２段処理が、有効であるという
事実に基づくものである。
そして、前記アルミナウイスカの前駆体とは、
前記低い酸化雰囲気で加熱するという予備処理に
より形成される極く薄いアルミナ被膜を称してい
る。
ただし、この極く薄いアルミナ被膜は、常温常
圧雰囲気で生ずる表面酸化状態よりは厚い酸化被
膜であり、通常このアルミナ被膜を有する基材表
面は、鈍灰色を呈している。
この後、素材が波板成形され、第４図に示すよ
うに、波板１９と平板２１とが重ね合わせられ、
これ等が多重に巻回され、担体２３が成形され
る。この後、波板１９と平板２１とがろう付けあ
るいは溶接され、さらに、十分な酸素雰囲気で、
担体２３にアルミナウイスカの成長熱処理が施さ
れる（特開昭57−71898号公報参照）。
〔発明が解決しようとする問題点〕
しかしながら、このような従来の金属触媒担体
の製造方法では、波板１９と平板２１とのろう付
けあるいは溶接の前に、予め、波板１９の素材
に、ろう付けおよび溶接を阻害するアルミナウイ
スカの前駆体と称するアルミナ薄被膜を形成する
ため、このアルミナ薄被膜が、基材とろう材ない
しは基材同士の直接の接触をさまたげるので、波
板１９と平板２１とのろう付けあるいは溶接の強
度が低下するという問題があつた。
〔発明の目的〕
本発明は、かかる従来の問題を解決するために
なされたもので、波板と平板とのろう付けあるい
は溶接の強度を従来より大幅に向上することので
きる金属触媒担体の製造方法を提供することを目
的とする。
〔問題点を解決するための手段〕
本発明に係わる金属触媒担体の製造方法は、ア
ルミニウムを含むフエライト系ステンレスからな
る素材を波板成形し、この波板と平板とを重ね合
わせ、これ等を多重に巻回した後、前記波板と平
板とをろう付けあるいは溶接し、この後、素材表
面にアルミナウイスカの成長熱処理を施す金属触
媒担体の製造方法において、前記素材表面のアル
ミナウイスカの成長熱処理の直前工程において、
200〜400℃の大気中雰囲気で２〜20分間加熱す
る、アルミナの前駆体を形成するための予備処理
を行なうものである。
〔発明の作用〕
本発明においては、平板と波板とのろう付けあ
るいは溶接後で、素材表面のアルミナウイスカの
成長熱処理の直前工程において、前記素材表面に
アルミナの前駆体を形成するための予備処理を行
なうので、前記ろう付けあるいは溶接を阻害する
ことなく、波板と平板とのろう付けあるいは溶接
の強度を従来より大幅に向上することができる。
〔発明の実施例〕
以下、本発明方法の詳細を図面を用いて説明す
る。
第１図は、本発明の金属触媒担体の製造方法の
一例を示すもので、この金属触媒担体の製造方法
では、まず、予備処理の施されない状態の素材が
波板成形され、波板と平板とが重ね合わせられ、
これ等が多重に巻回され、担体が成形され、この
後、波板と平板とがろう付けあるいは溶接され
る。
この後、アルミニウムを含むフエライト系ステ
ンレスからなる素材に、アルミナの前駆体を形成
するための予備処理が行なわれる。この予備処理
は、200〜400℃の大気中雰囲気で２〜20分間加熱
することにより行なわれる。
この後、アルミナウイスカの成長熱処理が施さ
れる。
しかして、本発明では、平板と波板とのろう付
けあるいは溶接後で、素材表面のアルミナウイス
カの成長熱処理の直前工程において、前記素材表
面にアルミナの前駆体を形成するための予備処理
を行なうので、前記ろう付けあるいは溶接を阻害
することなく、波板と平板とのろう付けあるいは
溶接の強度を従来より大幅に向上することができ
る。
また、従来は、予備加熱のための処理の炉中加
熱と、ウイスカ成長処理のための炉中加熱とが、
分断した別工程であつたので、炉中への搬送工程
が２回あつたのに対し、本発明では、予備処理と
アルミナウイスカの成長熱処理とが連続して行な
われるため、金属触媒担体を熱処理場から他の場
所に移動することなく処理することが可能とな
り、熱処理工程が大幅に簡易化し、コストの低減
を図ることができる。
さらに、本発明では、ろう付け等の終了後にお
いて予備処理が行なわれるため、ハンドリング等
に起因する素材の異常酸化を防止することができ
る。
次表は、大気中雰囲気で予備処理を行なつた時
の、アルミナウイスカの成長熱処理におけるアル
ミナウイスカの生成状態を示すもので、○は、ア
ルミナウイスカが生成した場合を、△はアルミナ
ウイスカが不完全に生成した場合を、×は、アル
ミナウイスカが生成しない場合を示している。
[Industrial Field of Application] The present invention relates to a method for producing a metal catalyst carrier used in a metal catalytic converter or the like for purifying exhaust gas. [Prior Art] Generally, in metal catalytic converters and the like for purifying exhaust gas, a metal catalyst carrier as disclosed in, for example, Japanese Unexamined Patent Publication No. 56-96726 is used. FIG. 2 shows this type of metal catalyst carrier. This metal catalyst carrier is coated on the surface of a base material 11 made of ferritic stainless steel containing aluminum to improve so-called spalling resistance.
By performing heat treatment, an alumina whisker layer 13 is formed by diffusion of aluminum. Here, as the base material 11, for example, Fe-20Cr-
An alloy of 5Al is used. Further, the alumina whisker layer 13 is made of α-Al 2 O 3 . Furthermore, a catalyst-supported alumina layer 15 is formed on the surface of this alumina whisker layer 13, and this catalyst-supported alumina layer 15 is impregnated with a metal catalyst 17. Here, the catalyst-supported alumina layer 15
is made of, for example, γ-Al 2 O 3 . Further, for the metal catalyst 17, Pt, Rh, etc. are used. Figure 3 shows a conventional manufacturing method for such a metal catalyst carrier. In this method, a precursor of alumina whiskers is first added to a material made of ferritic stainless steel containing aluminum. Preparatory treatment for forming the body is performed. This pretreatment is performed by heating for about 1 minute in a low oxygen atmosphere at 800° C., for example. This means that when producing alumina, in order to efficiently grow alumina into a whisker shape, first of all,
This is based on the fact that a two-step process is effective, in which a very thin alumina coating is formed by heating in a low oxidizing atmosphere, followed by oxidation by heating in a sufficiently oxidizing atmosphere. And, the alumina whisker precursor is:
It refers to an extremely thin alumina film formed by the preliminary treatment of heating in the low oxidizing atmosphere. However, this extremely thin alumina coating is a thicker oxide coating than the surface oxidation state that occurs in an atmosphere of normal temperature and normal pressure, and the surface of the base material having this alumina coating usually exhibits a dull gray color. After this, the material is formed into a corrugated sheet, and as shown in FIG. 4, the corrugated sheet 19 and the flat sheet 21 are overlapped,
These are wound multiple times to form the carrier 23. After this, the corrugated plate 19 and the flat plate 21 are brazed or welded, and further, in a sufficient oxygen atmosphere,
The carrier 23 is subjected to an alumina whisker growth heat treatment (see Japanese Patent Laid-Open No. 71898/1983). [Problems to be Solved by the Invention] However, in such a conventional method for manufacturing a metal catalyst carrier, before brazing or welding the corrugated plate 19 and the flat plate 21, the material of the corrugated plate 19 is coated with In order to form a thin alumina film called a precursor of alumina whiskers that inhibits brazing and welding, this thin alumina film prevents direct contact between the base material and the brazing metal or between the base materials. There was a problem that the strength of brazing or welding with No. 21 was reduced. [Object of the Invention] The present invention was made in order to solve such conventional problems, and is to produce a metal catalyst carrier that can significantly improve the strength of brazing or welding between a corrugated plate and a flat plate compared to the conventional one. The purpose is to provide a method. [Means for Solving the Problems] The method for manufacturing a metal catalyst carrier according to the present invention involves forming a material made of ferrite stainless steel containing aluminum into a corrugated plate, overlapping the corrugated plate and a flat plate, and then forming the corrugated plate and the flat plate. In the method for producing a metal catalyst carrier, the corrugated plate and the flat plate are brazed or welded together after multiple windings, and then alumina whisker growth heat treatment is performed on the surface of the material. In the process immediately before
A pretreatment for forming an alumina precursor is performed by heating in an air atmosphere at 200 to 400°C for 2 to 20 minutes. [Function of the Invention] In the present invention, after brazing or welding a flat plate and a corrugated plate, a preliminary process for forming an alumina precursor on the surface of the material is performed in a step immediately before heat treatment for growth of alumina whiskers on the surface of the material. Since the treatment is performed, the strength of brazing or welding between a corrugated plate and a flat plate can be significantly improved compared to the conventional method without interfering with the brazing or welding. [Embodiments of the Invention] Details of the method of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of the method for producing a metal catalyst carrier of the present invention. In this method for producing a metal catalyst carrier, first, a material that has not been pretreated is formed into a corrugated plate, and a corrugated plate and a flat plate are formed. are superimposed,
These are wound multiple times to form a carrier, and then the corrugated plate and flat plate are brazed or welded. Thereafter, the material made of ferritic stainless steel containing aluminum is subjected to preliminary treatment to form an alumina precursor. This pretreatment is carried out by heating in an air atmosphere at 200 to 400°C for 2 to 20 minutes. After this, an alumina whisker growth heat treatment is performed. Therefore, in the present invention, after brazing or welding a flat plate and a corrugated plate, a preliminary treatment for forming an alumina precursor on the surface of the material is performed in a step immediately before the heat treatment for growth of alumina whiskers on the surface of the material. Therefore, the strength of brazing or welding between the corrugated plate and the flat plate can be significantly improved compared to the conventional method without impeding the brazing or welding. Furthermore, conventionally, in-furnace heating for preheating treatment and in-furnace heating for whisker growth treatment were
In contrast, in the present invention, the preliminary treatment and the alumina whisker growth heat treatment are performed continuously, so the metal catalyst carrier is heat treated. It becomes possible to perform the treatment without moving from one place to another, greatly simplifying the heat treatment process and reducing costs. Furthermore, in the present invention, since preliminary treatment is performed after brazing etc., abnormal oxidation of the material due to handling etc. can be prevented. The following table shows the state of alumina whisker formation during alumina whisker growth heat treatment when pretreatment is performed in the air. × indicates that alumina whiskers are not produced.
以上述べたように、本発明によれば、平板と波
板とのろう付けあるいは溶接後で、アルミナウイ
スカの成長熱処理の直前工程において、アルミナ
の前駆体を形成するための予備処理を行なうの
で、前記ろう付けあるいは溶接を阻害することな
く、波板と平板とのろう付けあるいは溶接の強度
を従来より大幅に向上することができるという利
点がある。
また、ろう付けまたは溶接への影響を考慮する
必要がないので、従来の予備処理（800℃、低酸
素雰囲気）に較べて、圧力条件は大気圧、温度条
件は200〜400℃と緩く、生産上、品質管上、きわ
めて有益である。
As described above, according to the present invention, after brazing or welding the flat plate and the corrugated plate, the preliminary treatment for forming the alumina precursor is performed in the step immediately before the alumina whisker growth heat treatment. There is an advantage that the strength of brazing or welding between a corrugated plate and a flat plate can be significantly improved compared to the conventional method without impeding the brazing or welding. In addition, since there is no need to consider the effect on brazing or welding, the pressure conditions are atmospheric pressure and the temperature conditions are 200 to 400°C, which are more relaxed than conventional pretreatment (800°C, low oxygen atmosphere), and production Above all, it is extremely beneficial in terms of quality control.
第１図は本発明の金属触媒担体の製造方法の一
実施例を示す流れ図、第２図は金属触媒担体を示
す縦断面図、第３図は従来の金属触媒担体の製造
方法の一例を示す流れ図、第４図は波板と平板と
を巻回した状態を示す斜視図である。
１９……波板、２１……平板。
Fig. 1 is a flowchart showing an example of the method for producing a metal catalyst carrier of the present invention, Fig. 2 is a longitudinal cross-sectional view showing the metal catalyst carrier, and Fig. 3 is an example of a conventional method for producing a metal catalyst carrier. FIG. 4 is a perspective view showing a state in which a corrugated plate and a flat plate are wound. 19...corrugated plate, 21...flat plate.
Claims (1)
からなる素材を波板成形し、この波板と平板とを
重ね合わせ、これ等を多重に巻回した後、前記波
板と平板とをろう付けあるいは溶接し、この後、
素材表面にアルミナウイスカの成長熱処理を施す
金属触媒担体の製造方法において、前記アルミナ
ウイスカの成長熱処理の直前工程において、20〜
400℃の大気雰囲気中で２〜20分間加熱する、ア
ルミナの前駆体を形成するための予備処理を行な
うことを特徴とする金属触媒担体の製造方法。1 A material made of ferritic stainless steel containing aluminum is formed into a corrugated plate, the corrugated plate and a flat plate are overlapped, and these are wound multiple times, and then the corrugated plate and the flat plate are brazed or welded. rear,
In a method for producing a metal catalyst carrier in which the surface of the material is subjected to heat treatment for growth of alumina whiskers, in the step immediately before the heat treatment for growth of alumina whiskers, 20 to
A method for producing a metal catalyst carrier, which comprises performing a pretreatment for forming an alumina precursor by heating in an air atmosphere at 400°C for 2 to 20 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61153854A JPS637838A (en) | 1986-06-30 | 1986-06-30 | Manufacture of metallic catalyst carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61153854A JPS637838A (en) | 1986-06-30 | 1986-06-30 | Manufacture of metallic catalyst carrier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS637838A JPS637838A (en) | 1988-01-13 |
| JPH053342B2 true JPH053342B2 (en) | 1993-01-14 |
Family
ID=15571555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61153854A Granted JPS637838A (en) | 1986-06-30 | 1986-06-30 | Manufacture of metallic catalyst carrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS637838A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2627668B2 (en) * | 1989-08-04 | 1997-07-09 | 昭和飛行機工業株式会社 | Heat-resistant structure and manufacturing method thereof |
-
1986
- 1986-06-30 JP JP61153854A patent/JPS637838A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS637838A (en) | 1988-01-13 |
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