JPH0350199A - Formation of alumina whisker on surface of fe-cr-al type ferritic stainless steel - Google Patents
Formation of alumina whisker on surface of fe-cr-al type ferritic stainless steelInfo
- Publication number
- JPH0350199A JPH0350199A JP1184767A JP18476789A JPH0350199A JP H0350199 A JPH0350199 A JP H0350199A JP 1184767 A JP1184767 A JP 1184767A JP 18476789 A JP18476789 A JP 18476789A JP H0350199 A JPH0350199 A JP H0350199A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- ferritic stainless
- whiskers
- air
- formation
- 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.)
- Granted
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 25
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 230000015572 biosynthetic process Effects 0.000 title description 9
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000004381 surface treatment Methods 0.000 claims abstract description 4
- 229910002060 Fe-Cr-Al alloy Inorganic materials 0.000 claims abstract 5
- 238000010438 heat treatment Methods 0.000 claims description 28
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000004663 powder metallurgy Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 16
- 239000003054 catalyst Substances 0.000 abstract description 10
- 239000000843 powder Substances 0.000 abstract description 5
- 230000003197 catalytic effect Effects 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 238000004299 exfoliation Methods 0.000 abstract 1
- 238000007670 refining Methods 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- 229910006415 θ-Al2O3 Inorganic materials 0.000 abstract 1
- 239000010935 stainless steel Substances 0.000 description 5
- 239000011888 foil Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 241000264877 Hippospongia communis Species 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000002233 thin-film X-ray diffraction Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Crystals, And After-Treatments Of Crystals (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、Ｆｅ−Ｃｒ−Ａ Ｑ系フェライトステンレス
渭表面にアルミナウィスカーを生成する方法に関し、特
に自動車排ガス触媒コンバータ用のメタルハニカム用材
料として、或いはその他多くの触媒装置用材料として用
いられる場合に、それらの材料の表面層にアルミナウィ
スカーを生成する方法に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for producing alumina whiskers on the surface of Fe-Cr-A Q-based ferrite stainless steel, particularly as a material for metal honeycombs for automobile exhaust gas catalytic converters. The present invention relates to a method for producing alumina whiskers in the surface layer of materials used in catalytic devices, and many other catalyst devices.
（従来の技術）
従来、自動車排ガス浄化用触媒コンバータとしてはセラ
ミックス製ハニカムにγ−アルミナ粒子を触媒担体とし
てコーティングした後、Ｐｔ、などの触媒をつけたもの
が用いられている。このセラミックス製ハニカムを耐高
温酸化性に優れるステンレス鋼箔で製造すると触媒の支
持体が金属であるため、熱伝導性、強靭性の面でセラミ
ックス支持体に勝り、触媒性能、エンジン性能の向上な
どを図ることができる。(Prior Art) Conventionally, as a catalytic converter for automobile exhaust gas purification, a ceramic honeycomb coated with γ-alumina particles as a catalyst carrier and then coated with a catalyst such as Pt has been used. If this ceramic honeycomb is manufactured using stainless steel foil, which has excellent high-temperature oxidation resistance, the catalyst support is metal, so it is superior to ceramic supports in terms of thermal conductivity and toughness, and improves catalyst performance and engine performance. can be achieved.
しかしながら、ステンレス鋼箔へ直接γ−アルミナ触媒
担体をつけた場合、使用中の温度変化や機械的震動によ
り触媒担体が剥離する欠点がある。However, when the γ-alumina catalyst carrier is applied directly to the stainless steel foil, there is a drawback that the catalyst carrier may peel off due to temperature changes or mechanical vibrations during use.
この欠点を克服する方法としてステンレス鋼箔の表面に
アルミナウィスカーを設け、これにγ−アルミナ触媒担
体をつけて触媒担体の耐剥離性を向上させている。As a method to overcome this drawback, alumina whiskers are provided on the surface of stainless steel foil, and a γ-alumina catalyst carrier is attached to this to improve the peeling resistance of the catalyst carrier.
アルミナウィスカーを生成させる方法としては種々の方
法が提案されている。例えば、特開昭５７−７１８９８
号では、冷間圧延されたＡｌ含有フェライトステンレス
鋼箔を酸素分圧０，７５Ｔｏｒｒ以下の低酸素雰囲気中
で８７５〜９２５℃で約１分間加熱した後、空気中で８
７０〜９３０℃間の温度域で長時間加熱して、表面にア
ルミナウィスカーを成長させている。この方法によれば
、雰囲気を制御できる連続酸化炉が必要であるが、均一
な雰囲気を得るのが困難であり、又、そのような装置は
高価になるという欠点があった。Various methods have been proposed for producing alumina whiskers. For example, JP-A-57-71898
In this issue, cold-rolled Al-containing ferritic stainless steel foil was heated at 875-925°C for about 1 minute in a low-oxygen atmosphere with an oxygen partial pressure of 0.75 Torr or less, and then heated in air at 875-925°C.
Alumina whiskers are grown on the surface by heating in a temperature range of 70 to 930°C for a long time. This method requires a continuous oxidation furnace that can control the atmosphere, but it has the disadvantage that it is difficult to obtain a uniform atmosphere and such equipment is expensive.
又、特開昭６２−１４９８６２号はＡｌ含有フェライト
ステンレス鋼材にブラスト処理を行なった後高温で酸化
させアルミナウィスカーを生成させている。Further, in JP-A-62-149862, an Al-containing ferritic stainless steel material is blasted and then oxidized at high temperature to produce alumina whiskers.
同様に、特願昭６２−２９９７１０号ではブラスト処理
の代りにワイヤーブラシで研磨した後高温で酸化させア
ルミナウィスカーを生成させているが、いずれも十分と
は云えない。Similarly, in Japanese Patent Application No. 62-299710, instead of blasting, alumina whiskers are generated by polishing with a wire brush and then oxidizing at a high temperature, but neither method can be said to be sufficient.
（発明が解決しようとする課題）
本発明は、以上の如き酸化前処理を行なうことなく、Ａ
ｌ含有フェライトステンレス鋼表面にアルミナウィスカ
ーを生成させる方法を提供することを目的とする。(Problems to be Solved by the Invention) The present invention solves the problem of A
The present invention aims to provide a method for producing alumina whiskers on the surface of l-containing ferritic stainless steel.
（課題を解決するための手段）
本発明は、少なくとも表面に１０〜３０％Ｃｒ、６〜２
０％Ａｌを有するＦｅ−Ｃｒ−Ａ Ｑ系フェライトステ
ンレス鋼を大気雰囲気４００〜６００℃で加熱して該表
面にＯ−Ａ Ｑ 、Ｏ，を形成し、その後、８５０〜９
７５℃に加熱することを特徴とするＦｅ−Ｃｒ−Ａ Ｑ
系フェライトステンレス鋼表面のアルミナウィスカー生
成方法である。(Means for Solving the Problems) The present invention provides at least 10 to 30% Cr and 6 to 2% Cr on the surface.
Fe-Cr-A Q-based ferritic stainless steel containing 0% Al is heated at 400-600°C in an air atmosphere to form O-A Q , O, on the surface, and then 850-9
Fe-Cr-A Q characterized by heating to 75°C
This is a method for producing alumina whiskers on the surface of ferritic stainless steel.
即ち、本発明は冷間圧延状態のＦｅ−Ｃｒ−Ａ Ｑ系フ
ェライトステンレス鋼に大気雰囲気中で２段熱処理を行
なって、Ｆｅ−Ｃｒ−Ａ Ｑ系フェライトステンレス鋼
表面にアルミナウィスカーを生成させるのである。That is, in the present invention, cold-rolled Fe-Cr-A Q-based ferritic stainless steel is subjected to two-stage heat treatment in an atmospheric atmosphere to generate alumina whiskers on the surface of the Fe-Cr-A Q-based ferritic stainless steel. be.
本発明で使用するＦｅ−Ｃｒ−Ａ Ｑ系フェライトステ
ンレス鋼とは、少なくとも表面に１０〜３０％Ｃｒ、６
〜２０％Ａ Ｑを有するＦｅ基材料である。本発明にか
かるアルミナウィスカーの生成は、専らその表面にのみ
生成する現象であるので、使用するフェライト系ステン
レス鋼は、ｉ含有フェライト系ステンレス鋼でも、Ａｌ
を含有しないフェライト系ステンレス鋼でも、何れでも
良いが、少なくとも表面が１０〜３０％Ｃｒ、６〜２０
％Ａｌを有するＦｅ基材料であることを要する。１０〜
３０％Ｃｒとしたのは１０％未満では使用上、十分な耐
食性、耐酸化性が得られず、又３０％を超えると脆化が
著しくなるためである。６〜２０％Ａｌとしたのは、６
％未満では表面に均一にθ−アルミナを生成させるには
不十分であって、表面に均一にθ−Ａ Ｑ 、Ｏ，を形
成するには６％以上の量が必要であり、２０％以下とし
たのは、２０％を超えてもウィスカー生成に関しては顕
著な向上効果がないためである。The Fe-Cr-A Q-based ferritic stainless steel used in the present invention has at least 10 to 30% Cr and 6
It is a Fe-based material with ~20% AQ. Since the generation of alumina whiskers according to the present invention is a phenomenon that occurs exclusively on the surface, the ferritic stainless steel used, even the i-containing ferritic stainless steel, has Al
Any ferritic stainless steel containing no Cr may be used, but at least the surface contains 10 to 30% Cr, 6 to 20
%Al. 10～
The reason why the content is 30% Cr is that if it is less than 10%, sufficient corrosion resistance and oxidation resistance cannot be obtained in use, and if it exceeds 30%, embrittlement becomes significant. 6 to 20% Al is 6
% is insufficient to uniformly generate θ-alumina on the surface, and 6% or more is required to uniformly form θ-A Q , O, on the surface, and 20% or less This is because even if it exceeds 20%, there is no significant improvement effect on whisker generation.
本発明で使用するＦｅ−Ｃｒ−Ａ Ｑ系フェライトステ
ンレス鋼としては、溶製法、粉末冶金法、表面処理法な
ど何れの方法によって製造したものでもよい。ただ、Ｆ
ｅ−Ｃｒ−Ａ Ｑ合金においてＡ Ｑ 濃度が高くなる
ほど脆化するため、溶製法での製造は困難になるが、粉
末冶金法、表面処理法は有利である。The Fe-Cr-A Q-based ferritic stainless steel used in the present invention may be manufactured by any method such as a melting method, a powder metallurgy method, or a surface treatment method. However, F
The higher the A Q concentration in the e-Cr-A Q alloy, the more brittle it becomes, making it difficult to manufacture by melting, but powder metallurgy and surface treatment methods are advantageous.
本発明において、１段目の熱処理条件を４００〜６００
℃としたのは、４００℃未満ではウィスカー生成に必要
なＡｌ酸化物が形成せず、６００℃以上では大気雰囲気
中の熱処理により短時間でも表面がＣｒの酸化物で覆わ
れてしまい、何れにしてもウィスカーが生成しないため
である。１段目の熱処理の加熱時間としては、通常、３
０秒〜１００分程度でよい。In the present invention, the first stage heat treatment conditions are 400 to 600
℃ is chosen because below 400℃, the Al oxide required for whisker generation will not form, and above 600℃, the surface will be covered with Cr oxide even for a short time due to heat treatment in the air. This is because whiskers are not generated even if the The heating time for the first stage heat treatment is usually 3
It may be about 0 seconds to 100 minutes.
続けて実施する２段目の熱処理条件として８５０〜９７
５℃としたのは、８５０℃未満では高アスペクト比のウ
ィスカー生成が認められず、又、９７５℃を超えるとブ
レーンな酸化表面を呈し、ウィスカー生成が認められな
い。熱処理時間としては４時間以上が適当である。850 to 97 as the second stage heat treatment conditions to be carried out continuously.
The reason why the temperature was set at 5°C is that when the temperature is lower than 850°C, high aspect ratio whisker formation is not observed, and when the temperature exceeds 975°C, a plain oxidized surface is exhibited and no whisker formation is observed. A suitable heat treatment time is 4 hours or more.
（作用）
本発明者等は、アルミナウィスカーの生成について種々
の実験を行なった結果、ウィスカーを生成させるために
は、先ず、材料表面全体にθ−Ａｌ□０．皮膜を作成し
たおくことが必要であるとの知見を得た。これをもとに
検討した結果、４００℃未満では雰囲気に関係なく、δ
−ｉ、Ｏ，となリウィスカー生成には寄与せず、６００
℃を超える温度では組成比の多いＦｅ、 Ｃｒの酸化物
で覆われてしまい、全面にウィスカーを生成させること
ができないことを確認した。そして、４００〜６００℃
では熱力学の生成自由エネルギーの低いθ−Ａ Ｑ 、
Ｏ，が大気雰囲気中でも優先的に生成する。このことは
、第１図に示したＸ線回折結果より理解できる。即ち第
１図はＦｅ−１５％Ｃｒ−９％Ａｌについて、第１段熱
処理として５００℃で１分間熱処理を行なった表面の薄
膜Ｘ線回折結果を示したものであるが、この第１図より
もＡα、帆が生成していることがわかる。２段目の熱処
理では材料表面全体に生成したｅ−Ａｌ、Ｏ。(Function) The present inventors conducted various experiments regarding the generation of alumina whiskers, and found that in order to generate whiskers, first, θ-Al□0. We found that it is necessary to create a film. As a result of studies based on this, we found that below 400°C, regardless of the atmosphere, δ
-i, O, does not contribute to rewhisker generation, 600
It was confirmed that if the temperature exceeds .degree. C., the material will be covered with oxides of Fe and Cr having a high composition ratio, making it impossible to form whiskers on the entire surface. And 400~600℃
Then, θ−A Q with low thermodynamic free energy of formation,
O, is preferentially generated even in the atmospheric atmosphere. This can be understood from the X-ray diffraction results shown in FIG. That is, Figure 1 shows the thin film X-ray diffraction results of the surface of Fe-15%Cr-9%Al that was heat-treated at 500°C for 1 minute as the first stage heat treatment. It can also be seen that Aα, a sail is generated. In the second heat treatment, e-Al and O were generated on the entire material surface.
は、ある方位に優先的に成長するが、この方位は格子欠
陥が伝わる拡散であり、温度依存性が強い。grows preferentially in a certain direction, but this direction is due to diffusion propagating lattice defects and has a strong temperature dependence.
ところが、この方位に垂直の方位は、格子内拡数のため
温度依存性が弱い。そのため、温度を下げていくとウィ
スカーのアスペクト比が低くなってしまう。また、９７
５℃以上ではα−Ａ［、Ｏ，が安定となり、これはウィ
スカーの形態をとらない。However, the orientation perpendicular to this orientation has weak temperature dependence due to the expansion within the lattice. Therefore, as the temperature is lowered, the aspect ratio of the whiskers decreases. Also, 97
At temperatures above 5°C, α-A[,O, becomes stable and does not take the form of whiskers.
実施例
使用した材料は、粉末冶金法で製造したＦｅ−１５％Ｃ
ｒ−９％Ａ Ｑ 、 Ｆｅ−２０％Ｃｒ−”１．５％ｌ
ｉ、Ｆｅ−２３％Ｃｒ−１２％１の３種類である。粉末
冶金法としては、Ｆｅ粉、Ｃｒ粉、Ａα粉をＶ型ミキサ
ーにて混合し、その後双ロル間に挿入して０．５ｍｍに
粉末圧延し、焼結、冷間圧延を経て最終０．２ｍｍの板
を製造する方法を採用した。The material used in the example was Fe-15%C manufactured by powder metallurgy.
r-9%AQ, Fe-20%Cr-”1.5%l
There are three types: i, Fe-23%Cr-12%1. In the powder metallurgy method, Fe powder, Cr powder, and Aα powder are mixed in a V-type mixer, then inserted between twin rolls and powder rolled to 0.5 mm, and then sintered and cold rolled to a final 0.5 mm. A method of manufacturing a 2 mm plate was adopted.
そして、先ず、第１段加熱を行なった。即ち、これらの
材料を、３００〜１０００℃の範囲で１００℃ごとに１
分間大気加熱を行なった。First, first stage heating was performed. That is, these materials were heated at 1°C for every 100°C in the range of 300 to 1000°C.
Atmospheric heating was performed for minutes.
その後、第２段加熱として、９００ ’Ｃ１１６時間の
大気熱処理を行なった。Thereafter, as second stage heating, air heat treatment was performed at 900'C for 116 hours.
これら２段階の加熱処理を行なった金属表面のウィスカ
ー生成の結果を、第２図の写真を基準として判定した。The results of whisker formation on the metal surface after these two steps of heat treatment were determined using the photograph in FIG. 2 as a reference.
第２図（ａ）は、Ｆｅ−１５％Ｃｒ−９％Ａｌについて
第１段熱処理を５００℃で１分間行ない、次いで９００
’Ｃ１１６時間の大気熱処理の第２段加熱を行なった
場合のＡｌ、０．ウィスカーの生成状態を示したもので
ある。FIG. 2(a) shows that Fe-15%Cr-9%Al was subjected to the first heat treatment at 500°C for 1 minute, then at 900°C.
'CAl when the second stage of atmospheric heat treatment was performed for 116 hours, 0. This shows the state of whisker generation.
このように材料表面に均一にウィスカーが生成した状態
を○とした。A state in which whiskers were uniformly generated on the material surface in this way was marked as ○.
第２図（ｂ）は、同一材料について、第１段熱処理を３
００℃で１分間行ない、次いで上記の第２段加熱を行な
った場合のＡ Ｑ 、Ｏ，ウィスカーの生成状態を示し
たものである。このようにウィスカーの形状がブレード
状であるか又は材料表面にウィスカーが均一に生成しな
い状態を△とした。Figure 2(b) shows that the same material was subjected to the first heat treatment three times.
This figure shows the state of formation of A Q , O, and whiskers when heating was carried out at 00° C. for 1 minute and then the second stage heating was carried out. In this way, a state in which the shape of the whiskers was blade-like or the whiskers were not uniformly formed on the material surface was rated as Δ.
第２図（ｃ）は、同一材料について第１段熱処理を１０
００℃で１分間行ない、次いで上記の第２段加熱を行な
った場合のＡ Ｑ 、Ｏ，ウィスカーの生成状態を示し
たものである。このように材料表面にウィスカーの生成
が認められない状態を×とした。Figure 2(c) shows that the same material was subjected to the first heat treatment for 10
This figure shows the state of formation of A Q , O, and whiskers when heating was carried out at 00° C. for 1 minute and then the second stage heating was carried out. A state in which no whisker formation was observed on the material surface was marked as x.
以上の写真を基準として判定した結果を第１表に示した
。Table 1 shows the results determined based on the above photographs.
（以下余白）
第１表
３００ △ △
△４００ ０ ０
０５００ ０ ０
０６００ ０ ０ ０７
００ △ △
△８００ △ △
△９００ △ △
△１０００ Ｘ
Ｘ Ｘ第１表に示し
たように、何れの材料の場合も、大気雰囲気で４００〜
６００℃加熱し、その後９００ ’Ｃで加熱することに
より、ウィスカー生成が確認できた。(Left below) Table 1 300 △ △
△400 0 0
0500 0 0
0600 0 0 07
00 △ △
△800 △ △
△900 △ △
△1000
X X As shown in Table 1, in the case of any material, the
Whisker formation was confirmed by heating at 600°C and then at 900'C.
（発明の効果）
以上より本発明は、少なくとも１０〜３０％Ｃｒ、 １
０〜３０％Ａ２を有するＦｅ−（１：ｒ−Ａ Ｑ系フェ
ライトステンレス鋼を大気雰囲気４００〜６００℃で加
熱し、その後８５０〜９７５℃に加熱することにより、
特別な前処理を行なうことなく該材料表面にアルミナウ
ィスカーを生成させることができる。(Effect of the invention) From the above, the present invention provides at least 10 to 30% Cr, 1
By heating Fe-(1:r-A Q-based ferritic stainless steel having 0 to 30% A2 in an air atmosphere at 400 to 600°C, and then heating it to 850 to 975°C,
Alumina whiskers can be generated on the surface of the material without any special pretreatment.
第１図は、第１段熱処理を行なったＦｅ−１５％Ｃｒ−
９％Ａｌ系フェラフエライトステンレス鋼薄膜Ｘ線回折
結果を示す図であり、第２図（ａ）、（ｂ）及び（Ｃ）
は、本発明に係るＦｅ−Ｃｒ−Ａ Ｑ系フェライトステ
ンレス鋼表面に生成した酸化物ウィスカーの生成状態を
示す表面走査型電子顕微鏡写真である。Figure 1 shows the Fe-15%Cr-
2 is a diagram showing the results of X-ray diffraction of a 9% Al-based ferraferrite stainless steel thin film, and FIGS. 2(a), (b), and (C)
1 is a surface scanning electron micrograph showing the state of oxide whiskers generated on the surface of the Fe-Cr-A Q-based ferritic stainless steel according to the present invention.
Claims (2)
ｌを有するＦｅ−Ｃｒ−Ａｌ系フェライトステンレス鋼
を大気雰囲気４００〜６００℃で加熱して該表面にθ−
Ａｌ＿２Ｏ＿３を形成し、その後、８５０〜９７５℃に
加熱することを特徴とするＦｅ−Ｃｒ−Ａｌ系フェライ
トステンレス鋼表面のアルミナウィスカー生成方法。1. 10-30% Cr, 6-20% A at least on the surface
Fe-Cr-Al based ferritic stainless steel having a θ-
A method for producing alumina whiskers on the surface of Fe-Cr-Al ferritic stainless steel, the method comprising forming Al_2O_3 and then heating to 850 to 975°C.
溶製法、粉末冶金法、表面処理法による製造材を含む請
求項第１項記載のアルミナウィスカー生成方法。2. 2. The method for producing alumina whiskers according to claim 1, wherein the Fe-Cr-Al ferritic stainless steel is manufactured by a melting method, a powder metallurgy method, or a surface treatment method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1184767A JPH0350199A (en) | 1989-07-19 | 1989-07-19 | Formation of alumina whisker on surface of fe-cr-al type ferritic stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1184767A JPH0350199A (en) | 1989-07-19 | 1989-07-19 | Formation of alumina whisker on surface of fe-cr-al type ferritic stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0350199A true JPH0350199A (en) | 1991-03-04 |
| JPH0513913B2 JPH0513913B2 (en) | 1993-02-23 |
Family
ID=16158969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1184767A Granted JPH0350199A (en) | 1989-07-19 | 1989-07-19 | Formation of alumina whisker on surface of fe-cr-al type ferritic stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0350199A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005248191A (en) * | 2004-03-01 | 2005-09-15 | Sumitomo Metal Ind Ltd | Ferritic stainless steel sheet having superior seizure resistance, and manufacturing method therefor |
| JP2005248190A (en) * | 2004-03-01 | 2005-09-15 | Sumitomo Metal Ind Ltd | Ferritic stainless steel sheet having superior seizure resistance for component of automotive exhaust gas system, and manufacturing method therefor |
| CN106164315A (en) * | 2014-04-08 | 2016-11-23 | 杰富意钢铁株式会社 | Ferrite-group stainless steel paper tinsel and manufacture method thereof |
| JP2018062711A (en) * | 2017-11-20 | 2018-04-19 | 株式会社クボタ | Method for manufacturing cast product having alumina barrier layer |
-
1989
- 1989-07-19 JP JP1184767A patent/JPH0350199A/en active Granted
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005248191A (en) * | 2004-03-01 | 2005-09-15 | Sumitomo Metal Ind Ltd | Ferritic stainless steel sheet having superior seizure resistance, and manufacturing method therefor |
| JP2005248190A (en) * | 2004-03-01 | 2005-09-15 | Sumitomo Metal Ind Ltd | Ferritic stainless steel sheet having superior seizure resistance for component of automotive exhaust gas system, and manufacturing method therefor |
| JP4519482B2 (en) * | 2004-03-01 | 2010-08-04 | 新日鐵住金ステンレス株式会社 | Ferritic stainless steel sheet for automobile exhaust system having excellent seizure resistance and method for producing the same |
| CN106164315A (en) * | 2014-04-08 | 2016-11-23 | 杰富意钢铁株式会社 | Ferrite-group stainless steel paper tinsel and manufacture method thereof |
| KR20160142371A (en) | 2014-04-08 | 2016-12-12 | 제이에프이 스틸 가부시키가이샤 | Ferritic stainless-steel foil and process for producing same |
| US10227674B2 (en) | 2014-04-08 | 2019-03-12 | Jfe Steel Corporation | Ferritic stainless steel foil and method for producing the same |
| JP2018062711A (en) * | 2017-11-20 | 2018-04-19 | 株式会社クボタ | Method for manufacturing cast product having alumina barrier layer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0513913B2 (en) | 1993-02-23 |
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