JPH04308064A - Material having high electric resistance and production thereof - Google Patents
Material having high electric resistance and production thereofInfo
- Publication number
- JPH04308064A JPH04308064A JP3099607A JP9960791A JPH04308064A JP H04308064 A JPH04308064 A JP H04308064A JP 3099607 A JP3099607 A JP 3099607A JP 9960791 A JP9960791 A JP 9960791A JP H04308064 A JPH04308064 A JP H04308064A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- powder
- electric resistance
- electrical resistance
- high electric
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000000843 powder Substances 0.000 claims abstract description 15
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 11
- 239000000956 alloy Substances 0.000 claims abstract description 11
- 229910002060 Fe-Cr-Al alloy Inorganic materials 0.000 claims abstract description 8
- 238000000748 compression moulding Methods 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 10
- 230000003647 oxidation Effects 0.000 abstract description 7
- 238000007254 oxidation reaction Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 13
- 238000001513 hot isostatic pressing Methods 0.000 description 7
- 229910000640 Fe alloy Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 241000337544 Limnoriidae Species 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- 238000009689 gas atomisation Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000004663 powder metallurgy Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910017060 Fe Cr Inorganic materials 0.000 description 1
- 229910002544 Fe-Cr Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Landscapes
- Catalysts (AREA)
- Powder Metallurgy (AREA)
- Non-Adjustable Resistors (AREA)
- Conductive Materials (AREA)
- Resistance Heating (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、耐熱性、耐酸化性、製
造性に優れたＦｅ−Ｃｒ−Ａｌ系合金に関するもので、
高温の排ガス雰囲気下での抵抗力が要求される自動車排
ガス浄化用触媒支持体に好適のほか、石油、ガス等の炭
化水素系の燃料を用いる高温装置用材料、例えば石油ス
トーブや温風ヒータ等の各種暖房器具部品やバーナ、電
熱線等の発熱体に有用である。[Industrial Application Field] The present invention relates to a Fe-Cr-Al alloy having excellent heat resistance, oxidation resistance, and manufacturability.
In addition to being suitable for catalyst supports for automobile exhaust gas purification that require resistance in high-temperature exhaust gas atmospheres, it is also a material for high-temperature devices that use hydrocarbon fuels such as oil and gas, such as oil stoves and hot air heaters. It is useful for heating elements such as various heating equipment parts, burners, and electric heating wires.
【０００２】0002
【従来の技術】従来よりＦｅ−Ｃｒ−Ａｌ系電気抵抗材
料として、２５Ｃｒ−５Ａｌ系鉄合金が主として使用さ
れている。そしてＦｅ−Ｃｒ−Ａｌ系鉄合金は、Ａｌの
添加量をさらに増大することにより電気抵抗値が著しく
向上することが知られている。この電気抵抗材料の製造
方法としては、溶解法によるものと粉末冶金法によるも
のとがある。2. Description of the Related Art Conventionally, 25Cr-5Al iron alloys have been mainly used as Fe-Cr-Al electric resistance materials. It is known that the electrical resistance of Fe-Cr-Al iron alloys can be significantly improved by further increasing the amount of Al added. Methods for manufacturing this electrically resistive material include a melting method and a powder metallurgy method.
【０００３】0003
【発明が解決しようとする課題】しかしながら、このＦ
ｅ−Ｃｒ−Ａｌ系鉄合金は、溶解法により製造したもの
であると、Ａｌの含有量が増大するに従い熱間加工が困
難になり、Ａｌの含有量が５％以上になると実質上熱間
加工ができなくなる。一方、粉末冶金法により製造した
ものであると、粉末を固化した後の塑性加工が溶解法に
より製造したものと同様にできなくなるので、Ａｌの含
有量を５％未満にしなければならなく、電気抵抗値を高
めることができなかった。そこで本発明が解決しようと
する課題は、Ａｌの含有量が５％以上であっても塑性加
工しやすく、電気抵抗値を一層増大し耐酸化性、耐熱性
および製造性の良好なＦｅ−Ｃｒ−Ａｌ系鉄合金からな
る高電気抵抗材料ならびにその製造方法を提供すること
にある。[Problem to be solved by the invention] However, this F
When e-Cr-Al iron alloys are manufactured by the melting method, hot working becomes difficult as the Al content increases, and when the Al content exceeds 5%, hot working becomes difficult. Processing becomes impossible. On the other hand, if the product is manufactured using the powder metallurgy method, the plastic working after solidifying the powder cannot be done in the same way as the product manufactured by the melting method, so the Al content must be kept below 5%, and the It was not possible to increase the resistance value. Therefore, the problem to be solved by the present invention is to create a Fe-Cr material that is easy to plastically work even when the Al content is 5% or more, further increases the electrical resistance value, and has good oxidation resistance, heat resistance, and manufacturability. - It is an object of the present invention to provide a high electrical resistance material made of an Al-based iron alloy and a method for manufacturing the same.
【０００４】0004
【課題を解決するための手段】前記課題を解決するため
の本発明の第１発明における高電気抵抗材料は、Ｆｅ−
Ｃｒ−Ａｌ系合金であって、その組成が、重量％で、Ｃ
ｒ ：１５〜３０％
Ａｌ ：５〜３０％
Ｃａ＋Ｍｇ：１．０％以下
Ｆｅ ：残部
の範囲にあることを特徴とする。本発明の第２発明にお
ける高電気抵抗材料の製造方法は、合金の組成が前記第
１発明の範囲にある粉末を容器に充填し、この容器内の
粉末を熱間で圧縮成形することを特徴とする。[Means for Solving the Problems] The high electrical resistance material in the first aspect of the present invention for solving the above problems is Fe-
A Cr-Al alloy, the composition of which is C
r: 15-30% Al: 5-30% Ca+Mg: 1.0% or less Fe: balance. The method for producing a high electrical resistance material according to the second aspect of the present invention is characterized in that a container is filled with powder having an alloy composition within the range of the first aspect, and the powder in the container is hot compression molded. shall be.
【０００５】前記合金の組成をＣｒ１５〜３０％の範囲
としたのは、Ｃｒ１５％未満にすると、耐酸化性が不充
分だからであり、３０％を超えると塑性加工が極めて困
難になるからである。Ａｌを５％以上としたのは、Ａｌ
の含有量が増大するほど電気抵抗値が著しく向上するた
めである。熱間静水圧プレスによりＡｌを３０％まで含
有させることができるが、これを超える含有量に増加す
ると、その後の鍛造等の塑性加工が困難になる。Ｃａ、
Ｍｇを加えることとしたのは、熱間静水圧プレス等によ
り粉末を固化した後の塑性加工性を改善するためである
。Ｃａ＋Ｍｇ１．０％以下としたのは、１．０％を超え
ると合金が脆化するためである。ここでＣａとＭｇはＣ
ａとＭｇの総量が１．０％以下であり、ＣａとＭｇの一
種のみを１．０％以下含有してもよい。The reason why the composition of the alloy is set in the range of 15 to 30% Cr is that if it is less than 15% Cr, the oxidation resistance is insufficient, and if it exceeds 30%, plastic working becomes extremely difficult. . The reason for setting Al to 5% or more is that Al
This is because the electrical resistance value increases significantly as the content increases. Al can be contained up to 30% by hot isostatic pressing, but if the content increases beyond this, subsequent plastic working such as forging becomes difficult. Ca,
The reason for adding Mg is to improve the plastic workability after solidifying the powder by hot isostatic pressing or the like. The reason why the Ca+Mg content is 1.0% or less is that if it exceeds 1.0%, the alloy becomes brittle. Here, Ca and Mg are C
The total amount of a and Mg is 1.0% or less, and only one of Ca and Mg may be contained at 1.0% or less.
【０００６】[0006]
【作用】本発明の高電気抵抗材料の製造方法によれば、
Ｆｅ−Ｃｒ−Ａｌ系合金に Ｃａ、Ｍｇを添加するこ
とにより熱間静水圧プレス等により粉末を固化した後の
塑性加工性が改善されるので、Ａｌの含有量を大幅に高
めることができ、高電気抵抗値をもつ合金が得られ、耐
酸化性の極めて良好な高電気抵抗材料が得られる。この
高電気抵抗材料の製造方法によると、前記高電気抵抗材
料を圧縮成形段階と、焼結段階をほぼ同時に行なう熱間
静水圧プレス等の粉末冶金法により比較的簡単な工程で
製造することができる。[Operation] According to the method for producing a high electrical resistance material of the present invention,
By adding Ca and Mg to the Fe-Cr-Al alloy, the plastic workability after solidifying the powder by hot isostatic pressing etc. is improved, so the Al content can be significantly increased. An alloy with a high electrical resistance value can be obtained, and a high electrical resistance material with extremely good oxidation resistance can be obtained. According to this method for manufacturing a high electrical resistance material, the high electrical resistance material can be manufactured in a relatively simple process using a powder metallurgy method such as hot isostatic pressing, in which a compression molding step and a sintering step are performed almost simultaneously. can.
【０００７】[0007]
【実施例】本発明の実施例について説明する。
実施例 １
ガス噴霧法により造った次の組成をもつ粉末を原料とし
た。重量％で、Ｃｒ：２０％、Ａｌ：１０％、Ｃａ＋Ｍ
ｇ：０．４％、残部実質的にＦｅの組成であった。この
合金粉末を軟鋼製の缶に充填し、その缶を真空に脱気し
封孔し、温度１１３０℃、圧力１０００ｋｇｆ／ｃｍ２
で熱間静水圧プレス（ＨＩＰ）を行ない、ビレットを
作製した。このビレットを１１５０℃から熱間で鍛造比
を５Ｓ以上に鍛造し、その後、熱間圧延して厚さ３ｍｍ
の板材を得た。このビレットについてグリブル試験を行
なったところ、６０％まで絞りが可能であった。得られ
た圧延材は電気抵抗値がきわめて高く、耐酸化性に優れ
たものであった。[Example] An example of the present invention will be described. Example 1 A powder having the following composition prepared by a gas atomization method was used as a raw material. In weight%, Cr: 20%, Al: 10%, Ca+M
g: 0.4%, the remainder being essentially Fe. This alloy powder was filled into a mild steel can, and the can was degassed and sealed in a vacuum at a temperature of 1130°C and a pressure of 1000 kgf/cm2.
Hot isostatic pressing (HIP) was performed to produce a billet. This billet is hot forged at 1150°C to a forging ratio of 5S or higher, and then hot rolled to a thickness of 3mm.
The board material was obtained. When this billet was subjected to a gribble test, it was possible to reduce the billet to 60%. The obtained rolled material had extremely high electrical resistance and excellent oxidation resistance.
【０００８】比較例 １
ガス噴霧法により造った次の組成をもつ粉末を原料とし
た。重量％で、Ｃｒ：２０％、Ａｌ：１０％、残部実質
的にＦｅの組成であった。この合金粉末を軟鋼製の缶に
充填し、その缶を真空に脱気し封孔し、温度１１３０℃
、圧力１０００ｋｇｆ／ｃｍ２ で熱間静水圧プレス（
ＨＩＰ）を行ない、ビレットを作製した。このビレット
を１１５０℃から熱間で鍛造した。このビレットについ
てグリブル試験を行なったところ、２０％まで絞りが可
能であったが、それ以上の絞りはできなかった。この鍛
造材は熱間圧延できず実用的でなかった。Comparative Example 1 A powder having the following composition prepared by a gas atomization method was used as a raw material. In terms of weight percent, the composition was Cr: 20%, Al: 10%, and the balance was substantially Fe. This alloy powder was filled into a mild steel can, the can was degassed in a vacuum, the pores were sealed, and the temperature was raised to 1130°C.
, hot isostatic press at a pressure of 1000 kgf/cm2 (
HIP) was performed to produce a billet. This billet was hot forged at 1150°C. When this billet was subjected to a gribble test, it was possible to reduce the billet to 20%, but it was not possible to reduce the billet further. This forged material could not be hot rolled and was not practical.
【０００９】比較例 ２
ガス噴霧法により造った次の組成をもつ粉末を原料とし
た。重量％で、Ｃｒ：２０％、Ａｌ：１０％、Ｃａ＋Ｍ
ｇ：１．２％、残部実質的にＦｅの組成であった。この
合金粉末を軟鋼製の缶に充填し、その缶を真空に脱気し
封孔したまま温度１１３０℃、圧力１０００ｋｇｆ／ｃ
ｍ２ で熱間静水圧プレス（ＨＩＰ）を行ない、ビレッ
トを製作した。このビレットを１１５０℃から熱間で鍛
造し、グリブル試験を行なったところ、２０％まで絞り
が可能であったが、比較例１と同様にそれ以上の絞りは
できなかった。この鍛造材は比較例１と同様に熱間圧延
できず実用的でなかった。Comparative Example 2 A powder having the following composition prepared by a gas atomization method was used as a raw material. In weight%, Cr: 20%, Al: 10%, Ca+M
g: 1.2%, the remainder being essentially Fe. This alloy powder was filled into a mild steel can, and the can was degassed in a vacuum and the pores were sealed at a temperature of 1130°C and a pressure of 1000 kgf/c.
A billet was produced by hot isostatic pressing (HIP) at m2. When this billet was hot forged at 1150° C. and subjected to a gribble test, it was possible to reduce the billet to 20%, but as in Comparative Example 1, it was not possible to reduce the billet further. Similar to Comparative Example 1, this forged material could not be hot rolled and was not practical.
【００１０】0010
【発明の効果】以上説明したように、本発明の高電気抵
抗材料によれば、Ｆｅ−Ｃｒ−Ａｌ系合金を前記組成に
することにより得られた合金の分塊性がきわめて良好と
なり、しかも得られた合金は高電気抵抗値を有し、かつ
耐熱性、耐酸化性および製造性に優れた高電気抵抗材料
であるという効果がある。本発明の製造方法によれば、
従来製造することができなかった高Ｃｒ−高Ａｌの高電
気抵抗材料を容易にかつ大量に生産可能となり、製造コ
ストを充分に低下することができるという効果がある。Effects of the Invention As explained above, according to the high electrical resistance material of the present invention, the alloy obtained by forming the Fe-Cr-Al alloy into the above-mentioned composition has extremely good blooming properties, and The obtained alloy has the effect of being a high electrical resistance material that has a high electrical resistance value and is excellent in heat resistance, oxidation resistance, and manufacturability. According to the manufacturing method of the present invention,
A high Cr-high Al high electrical resistance material, which could not be manufactured conventionally, can be easily produced in large quantities, and the manufacturing cost can be sufficiently reduced.
Claims (2)
成が、重量％で、 Ｃｒ ：１５〜３０％ Ａｌ ：５〜３０％ Ｃａ＋Ｍｇ：１．０％以下 Ｆｅ ：残部 の範囲にあることを特徴とする高電気抵抗材料。Claim 1: A Fe-Cr-Al alloy whose composition, in weight percent, is in the following range: Cr: 15-30% Al: 5-30% Ca+Mg: 1.0% or less Fe: Balance A high electrical resistance material characterized by:
粉末を容器に充填し、この容器内の粉末を熱間圧縮成形
することを特徴とする高電気抵抗材料の製造方法。2. A method for producing a high electrical resistance material, which comprises filling a container with powder having an alloy composition within the range set forth in claim 1, and hot compression molding the powder in the container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3099607A JPH04308064A (en) | 1991-04-04 | 1991-04-04 | Material having high electric resistance and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3099607A JPH04308064A (en) | 1991-04-04 | 1991-04-04 | Material having high electric resistance and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04308064A true JPH04308064A (en) | 1992-10-30 |
Family
ID=14251784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3099607A Pending JPH04308064A (en) | 1991-04-04 | 1991-04-04 | Material having high electric resistance and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04308064A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07331378A (en) * | 1994-06-03 | 1995-12-19 | Kobe Steel Ltd | Production of iron-chromium-aluminum sintered alloy |
| AU696386B2 (en) * | 1995-04-26 | 1998-09-10 | Sandvik Intellectual Property Ab | Method of manufacturing high temperature resistant shaped parts |
-
1991
- 1991-04-04 JP JP3099607A patent/JPH04308064A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07331378A (en) * | 1994-06-03 | 1995-12-19 | Kobe Steel Ltd | Production of iron-chromium-aluminum sintered alloy |
| AU696386B2 (en) * | 1995-04-26 | 1998-09-10 | Sandvik Intellectual Property Ab | Method of manufacturing high temperature resistant shaped parts |
| US5970306A (en) * | 1995-04-26 | 1999-10-19 | Kanthal Ab | Method of manufacturing high temperature resistant shaped parts |
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