JPS62199738A - Production of electrical contact point material of silver-tin oxide type alloy - Google Patents
Production of electrical contact point material of silver-tin oxide type alloyInfo
- Publication number
- JPS62199738A JPS62199738A JP4086386A JP4086386A JPS62199738A JP S62199738 A JPS62199738 A JP S62199738A JP 4086386 A JP4086386 A JP 4086386A JP 4086386 A JP4086386 A JP 4086386A JP S62199738 A JPS62199738 A JP S62199738A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- weight
- electrical contact
- mesh
- silver
- 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
- 239000000956 alloy Substances 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 title claims abstract description 21
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 20
- IVQODXYTQYNJFI-UHFFFAOYSA-N oxotin;silver Chemical compound [Ag].[Sn]=O IVQODXYTQYNJFI-UHFFFAOYSA-N 0.000 title claims description 6
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000000843 powder Substances 0.000 claims abstract description 42
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 229910052718 tin Inorganic materials 0.000 claims abstract description 6
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 3
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 3
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 3
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 3
- 229910052797 bismuth Inorganic materials 0.000 claims abstract 3
- 229910052791 calcium Inorganic materials 0.000 claims abstract 2
- 230000001590 oxidative effect Effects 0.000 claims abstract 2
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 5
- 229910052709 silver Inorganic materials 0.000 claims description 5
- 239000004332 silver Substances 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- 229910001887 tin oxide Inorganic materials 0.000 claims 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims 1
- 230000003647 oxidation Effects 0.000 abstract description 8
- 238000007254 oxidation reaction Methods 0.000 abstract description 8
- 229910052738 indium Inorganic materials 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 238000005204 segregation Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- 150000004706 metal oxides Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- QCEUXSAXTBNJGO-UHFFFAOYSA-N [Ag].[Sn] Chemical compound [Ag].[Sn] QCEUXSAXTBNJGO-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 241000209761 Avena Species 0.000 description 1
- 235000007319 Avena orientalis Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 235000011962 puddings Nutrition 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
本発明は１種々の′１［気製品や産業機械等に用いられ
る銀−錫（Ａｇ−５ｎ）系の粉末合金を内部酸化して得
られる銀−酸化錫系合金の電気接点材料の製造方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention is directed to the internal oxidation of silver-tin (Ag-5n) based powder alloys used in various products, industrial machinery, etc. The present invention relates to a method for manufacturing the resulting silver-tin oxide alloy electrical contact material.
（ロ）背景技術
主たる溶質金属として錫を比較的多層に、例えば錫を４
．５重量％以上含む銀合金は、Ｉｎ及び／或はＢｉを含
有せしめることによって、完全に内部酸化することがで
きる。(b) Background technology Tin is used as the main solute metal in relatively multiple layers, for example, 4 layers of tin as the main solute metal.
．． A silver alloy containing 5% by weight or more can be completely internally oxidized by containing In and/or Bi.
Ｓｎを４．５重量％以上１０重呈％以下と、０．１〜５
玉隈％のＩｎ及び／或は０．０１〜５＠贋％のＢＥとを
含む内部酸化された銀−錫系合金は、種々の電気・電子
機器の電気接点として今日広範に使用されている。Sn content is 4.5% by weight or more and 10% or less, and 0.1 to 5% by weight.
Internally oxidized silver-tin based alloys containing Tamakuma% In and/or 0.01-5% BE are widely used today as electrical contacts in various electrical and electronic devices. .
この種の銀−酸化錫（Ａｇ−ＳｎＯ）系電気接点材料は
、例えばアメリカ合衆国特許第３９３３４８５号や同特
許第４２４３４１３号等のＦｉ１行物に記載されるとこ
ろである。This type of silver-tin oxide (Ag-SnO) based electrical contact material is described in, for example, Fi1 publications such as US Pat. No. 3,933,485 and US Pat. No. 4,243,413.
この種の内部酸化されたＡｇ−ＳｎＯ系合金は、物理的
かつ電気的に優れた特性をもつ電気接点材料をつくるの
に適した最新のもっとも優れた材料の一つといえる。し
かしながら、この種のＡｇ−ＳｎＯ系合金は前述した通
りＳｎを比較的多量に含むので、ＳｎＯをはじめとする
酸化溶質金属は材料が比較的に大きな容積を有するとき
には、特に内部酸化によってその外表面領域に過分に偏
析しがちであり、内方領域では反対に希薄にな°りがち
である。しかも、銀マトリクス中におけるかかる金属酸
化物の偏析は、得られる電気接点材料の電気的と物理的
な特性、特に接触抵抗の不安定をもたらすことにもなり
かねない。This type of internally oxidized Ag-SnO alloy is one of the latest and best materials suitable for making electrical contact materials with excellent physical and electrical properties. However, as mentioned above, this type of Ag-SnO alloy contains a relatively large amount of Sn, so when the material has a relatively large volume, oxidized solute metals such as SnO will be absorbed by the outer surface of the material through internal oxidation. It tends to segregate excessively in regions, and on the contrary tends to become sparse in inner regions. Moreover, the segregation of such metal oxides in the silver matrix may lead to instability of the electrical and physical properties, particularly the contact resistance, of the resulting electrical contact material.
一方、！！と金属酸化物の粉末を用いて粉末焼結により
つくった電気接点材料は、上述した種類の偏析を避ける
ことはできる。しかし、粉末焼結法によった材料は、そ
の製法に伴う必然的な結果として構造が粗であって、汀
通の作業条件下であっても急速に消耗して、溶解法によ
って合金をつくり内部酸化したものとは比べうべくもな
い。on the other hand,! ! Electrical contact materials made by powder sintering using powders of metal oxides and metal oxides can avoid the above-mentioned types of segregation. However, materials produced by powder sintering have a rough structure as a natural result of the process, and they wear out quickly even under normal working conditions, making it difficult to make alloys by melting. There is no comparison with internally oxidized products.
（ハ）発明の開示 本発明は、金属酸化物の偏析が実質的になく。(c) Disclosure of the invention The present invention has substantially no segregation of metal oxides.
かつ密な構造を有する内部酸化した銀−酸化錫系合金の
接点材料の製法を提供することを目的とするものである
。Another object of the present invention is to provide a method for producing an internally oxidized silver-tin oxide alloy contact material having a dense structure.
即ち、本発明においては、０．５〜１０重縫％のＳｎと
０．５〜１５重量％のＳｎＯ２と残部＠丑％のＡｇの粉
末を混合し、この混合粉末を合金に焼結し、その溶質金
属を内部酸化してＡｇ−ＳｎＯ系合金の電気接点材料を
粉末冶金学的につくるものである。That is, in the present invention, powders of 0.5 to 10 weight percent Sn, 0.5 to 15 weight percent SnO2, and the balance @ox percent Ag are mixed, and this mixed powder is sintered into an alloy. The solute metal is internally oxidized to produce an Ag-SnO alloy electrical contact material using powder metallurgy.
焼結合金中にＳｎが４．５重量％以上含まれるときには
、０．１〜５重量％のＩｎ及び／或は０．０１〜５重量
％のＢｆが上記のＳｎを完全に内部酸化するために必要
とされる。When the sintered alloy contains 4.5% by weight or more of Sn, 0.1 to 5% by weight of In and/or 0.01 to 5% by weight of Bf completely internally oxidizes the Sn. required.
必要によッテは、Ｃｄ、Ｚｎ、Ｓｂ、Ｍｎ。If necessary, Cd, Zn, Sb, Mn.
Ｃａ等の銀と固溶し得る金属をＳｎと５ｎ０２の総計量
よりも低い重量％で添加し、必要に見合った特性が内部
酸化された合金材料にかえられるようにしてもよい。ま
た、鉄族金属を添加して合金の金属組織を微細にするこ
ともできる。Metals capable of forming a solid solution with silver, such as Ca, may be added in a weight percent lower than the total weight of Sn and 5n02, so that properties commensurate with the needs are imparted to the internally oxidized alloy material. Furthermore, the metal structure of the alloy can be made finer by adding an iron group metal.
この発明の方法においては、焼結合金中にＳｎ０２粒子
が存在するので、内部酸化時にｍ素は５ｎｏｙ粒子に沿
いかつこの粒子間を通って容易に内方に浸透して、内部
酸化の速度が早められ、この結果合金中の溶質金属、特
にＳｎは偏析することも希薄になることもなく、完全に
内部酸化され得ることになる。この場合、合金の容積が
大であっても同様であり、上記した良好な効果が特に顕
著にみとめられることになる。In the method of this invention, since Sn02 particles are present in the sintered alloy, the m element easily penetrates inward along the 5noy particles and between these particles during internal oxidation, and the rate of internal oxidation is reduced. As a result, the solute metals in the alloy, especially Sn, can be completely internally oxidized without segregation or dilution. In this case, the same holds true even if the volume of the alloy is large, and the above-mentioned good effects are particularly noticeable.
かかる効果に加えて、粉末冶金学的につくられてその構
造がややもすると粗になりがちな合金は、内部酸化時の
溶質金属の酸化による容積膨張のために密な構造となる
。In addition to this effect, alloys that are produced using powder metallurgy and tend to have a coarse structure become denser due to volume expansion due to oxidation of solute metal during internal oxidation.
本発明の方法において、Ｓｎと５ｎ０２の合計量は好適
には５〜２０重雀％装置る。これは、この合計量が５重
量％以下では接点開閉時のアークに耐え得るような耐火
性が得られないからでおり、またこの合計量が２０重量
％以上では得られる合金材料が脆くなりがちであるから
である。また、ＳｎＯ，＞、の号が０．５重量％以下で
は内部酸化の速度を早める効果があまりみられなくなり
、Ｓｎｕｇの沿を１５重量％以、ヒにすると材料が脆く
なってしまう。In the method of the present invention, the total amount of Sn and 5n02 is preferably 5 to 20%. This is because if the total amount is less than 5% by weight, fire resistance that can withstand arcing during contact opening and closing cannot be obtained, and if this total amount is more than 20% by weight, the resulting alloy material tends to become brittle. This is because. Further, if SnO,>, is less than 0.5% by weight, the effect of accelerating the rate of internal oxidation is not so great, and if SnO is less than 15% by weight, the material becomes brittle.
以下、本発明を実施例により更に説明する。The present invention will be further explained below with reference to Examples.
（ニ）実施例
（１）Ｓｎ−５重量％（２００メツシユ粉末）Ｉｎ−２
重量％（２００メツシユ粉末）Ｓｎ０２−５重量％（１
２０メ−／ シュ粉末）Ａｇ−残部％（１２０メツシユ
粉末）
（２）Ｓｎ−３重酸％（２００メツシユ粉末）Ｓｎ０２
−６重量％（１２０メツシユ粉末）Ｃｄ−２重量％（２
００メツシユ粉末）Ａｇ−残部％（１２０メツシユ粉末
）
（３） Ｓ ｎ −６重量％（２００メツシユ粉末）Ｓ
ｎ０２−３重置％（１２０メツシユ粉末）Ｂｊｏ、５．
＠量％（２００メツシユ粉末）Ａｇ−残部％（１２０メ
ツシユ粉末）
（４） Ｓ ｎ−４，５重量％（２００メツシユ粉末）
Ｓｎ０２−６％量％（１２０メツシユ粉末）Ｉｎ−１重
量％（２００メツシユ粉末）Ｚｎ−０，５重量％（２０
０メツシユ粉末）Ａｇ−残部％（１２０メツシユ粉末）
（５）Ｓｎ−３ｉ量％（２００メ−／ シュ粉末）’１
ｌｉｎｏ□−５重量％（１２０メツシユ粉末）Ｂｉ−０
，５重量％（２００メツシユ粉末）Ｓｂ−０，５重量％
（２００メツシユ粉末）Ａｇ−残部％（１２０メツシユ
粉末）
と記組成の材料（１）〜（５）をそれぞれ振動ミルを使
って４８時間混合した。この況合物（１）〜（５）を５
０７／ｃｍ２の圧力下で押して、下面に銀の裏張りをつ
けた５ ００１１１１＠、 １００＋ｉｓ長さ、１０■
厚のプリンコンパクトとした。各コンパクトをアルゴン
ガス雰囲気中８００℃で熱間圧延して２Ｉ厚とした。そ
こで、これを１Ｏａｔｓ＋、の酸素雰囲気中７００℃で
２．５時間内部酸化した。(d) Example (1) Sn-5% by weight (200 mesh powder) In-2
Weight% (200 mesh powder) Sn02-5 weight% (1
20 mesh/mesh powder) Ag-remainder% (120 mesh powder) (2) Sn-3 hydrogen acid% (200 mesh powder) Sn02
-6% by weight (120 mesh powder) Cd-2% by weight (2
00 mesh powder) Ag-remainder% (120 mesh powder) (3) S n -6% by weight (200 mesh powder) S
n02-3 Overlay % (120 mesh powder) Bjo, 5.
@Amount% (200 mesh powder) Ag-Remainder% (120 mesh powder) (4) S n-4.5% by weight (200 mesh powder)
Sn02-6% weight% (120 mesh powder) In-1 weight% (200 mesh powder) Zn-0.5 weight% (20 mesh powder)
0 mesh powder) Ag-remainder% (120 mesh powder) (5) Sn-3i amount% (200 mesh powder)'1
lino□-5% by weight (120 mesh powder) Bi-0
,5% by weight (200 mesh powder) Sb-0.5% by weight
(200 mesh powder) Ag-Remaining % (120 mesh powder) Materials (1) to (5) having the following compositions were mixed for 48 hours using a vibrating mill. This situation compound (1) to (5) is 5
5 001111@, 100+is length, 10■ pressed under pressure of 07/cm2 with silver lining on the underside
It was made into a thick pudding compact. Each compact was hot rolled at 800° C. in an argon gas atmosphere to a thickness of 2I. Therefore, this was internally oxidized at 700° C. for 2.5 hours in an oxygen atmosphere of 1 Oats+.
得られたＡｇ−３ｎＯ系合金の電気接点材料（１）〜（
５）は以下の特性を有し、ブレーカ−９開閉器、リレー
、スイッチ用として好適であることが分り、かつ顕Ｗｔ
鏡で観察したところ銀マトリツクス中に全尿酸化物の偏
析が全くみとめられなかった。The obtained Ag-3nO alloy electrical contact materials (1) to (
5) has the following characteristics and is found to be suitable for use in breaker-9 switches, relays, and switches.
When observed with a mirror, no segregation of total urine oxide was observed in the silver matrix.
導 屯 率 硬 さくＩ Ａ
ＣＳ ％）（ＨＲ″Ｆ”スケール）材＄４（１）
４８〜５２ ９２〜９８（２） ５２〜５６８８〜
９２
（３） ４８〜５３ １０２〜１０５
（４）５１〜５４ １００〜１０６
（５） ５５〜５９９７〜９９
この発明の方法において、焼結時間と温度は材料によっ
て変わるが、焼結温度は好適には７００〜９００℃で、
時間は１〜５時間である。Conduction rate Hardness IA
CS %) (HR″F″ scale) material $4 (1)
48~52 92~98(2) 52~5688~
92 (3) 48-53 102-105 (4) 51-54 100-106 (5) 55-5997-99 In the method of this invention, the sintering time and temperature vary depending on the material, but the sintering temperature is preferably is 700-900℃,
The time is 1 to 5 hours.
また、焼結時の雰囲気としてアルゴンガスの代りに他の
不活性ガスを用いてもよいことは勿論である。Furthermore, it goes without saying that other inert gases may be used instead of argon gas as the atmosphere during sintering.
特 許 出 願 人 中外電気１業株式会社代 理
人 弁理士 浅 賀 −夫同 弁理士
浅 賀 −樹Patent applicant Chugai Electric Co., Ltd. Agent
Patent Attorney Asaga - Husband Patent Attorney
Asaga - Itsuki
Claims (2)
％と残部が銀の各粉末を（但し、上記錫の量が４．５重
量％以上のときは０．１〜５重量％のインジウムの粉末
と０．０１〜５重量％のビスマスの粉末のいずれかまた
は双方を加えて）混合し、この混合物を焼結し、その後
にこの焼結した混合物を内部酸化することを特徴とする
銀−酸化錫系合金の電気接点材料の製法。(1) Powders containing 0.5 to 10% by weight of tin, 0.5 to 15% by weight of tin oxide, and the balance being silver (however, if the amount of tin is 4.5% by weight or more, 0.1 to 10% by weight) 5% by weight of indium powder and/or 0.01-5% by weight of bismuth powder), sintering the mixture, and then internally oxidizing the sintered mixture. A method for manufacturing a silver-tin oxide alloy electrical contact material characterized by:
又は鉄族金属の粉末の一種または複数を錫と酸化錫の合
計量よりも少ない量で添加する特許請求の範囲第１項記
載の銀−酸化錫系合金の電気接点材料の製法(2) Cd, Zn, Sb, Mn, Ca in the powder mixture
or a method for producing a silver-tin oxide based alloy electrical contact material according to claim 1, wherein one or more iron group metal powders are added in an amount smaller than the total amount of tin and tin oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4086386A JPS62199738A (en) | 1986-02-26 | 1986-02-26 | Production of electrical contact point material of silver-tin oxide type alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4086386A JPS62199738A (en) | 1986-02-26 | 1986-02-26 | Production of electrical contact point material of silver-tin oxide type alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62199738A true JPS62199738A (en) | 1987-09-03 |
Family
ID=12592368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4086386A Pending JPS62199738A (en) | 1986-02-26 | 1986-02-26 | Production of electrical contact point material of silver-tin oxide type alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62199738A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268583A (en) * | 2011-08-09 | 2011-12-07 | 福达合金材料股份有限公司 | Method for preparing silver tin oxide electrical contact material |
| CN103014395A (en) * | 2012-12-09 | 2013-04-03 | 温州聚星电接触科技有限公司 | Method for preparing efficient aerated mixed powder |
-
1986
- 1986-02-26 JP JP4086386A patent/JPS62199738A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268583A (en) * | 2011-08-09 | 2011-12-07 | 福达合金材料股份有限公司 | Method for preparing silver tin oxide electrical contact material |
| CN103014395A (en) * | 2012-12-09 | 2013-04-03 | 温州聚星电接触科技有限公司 | Method for preparing efficient aerated mixed powder |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4204863A (en) | Sintered contact material of silver and embedded metal oxides | |
| US3933485A (en) | Electrical contact material | |
| US5160366A (en) | Silver-metal oxide composite material and process for producing the same | |
| US2470034A (en) | Electric contact formed of a ruthenium composition | |
| CA1339713C (en) | Semi-finished produit for making electric contacts, made of a composite material based on silver and tinoxide and power-metallurgical process ofprooducing the semi-finished produit | |
| US4680162A (en) | Method for preparing Ag-SnO system alloy electrical contact material | |
| US4681702A (en) | Sintered, electrical contact material for low voltage power switching | |
| US3701654A (en) | Silver-base alloy for making electrical contacts | |
| JPS6212610B2 (en) | ||
| US5286441A (en) | Silver-metal oxide composite material and process for producing the same | |
| JPH0135914B2 (en) | ||
| KR960031028A (en) | Silver-tin oxide base sintered material for electrical contacts and method of making same | |
| EP0508746A1 (en) | Internally oxidised Ag-Sn-In alloy electrical contact materials and manufacturing method thereof | |
| JPS62199738A (en) | Production of electrical contact point material of silver-tin oxide type alloy | |
| US3525609A (en) | Copper alloy material | |
| GB2187200A (en) | Method of preparing Ag-SnO system alloy electrical contact materials | |
| US2189756A (en) | Molybdenum composition | |
| US5728194A (en) | Silver-iron material for electrical switching contacts (III) | |
| JPS6048578B2 (en) | electrical contact materials | |
| US2189755A (en) | Metal composition | |
| US5258052A (en) | Powder metallurgy silver-tin oxide electrical contact material | |
| US5808213A (en) | Silver-iron material for electrical switching contacts (II) | |
| GB2093066A (en) | Electrical contact material | |
| JPS6049705B2 (en) | Method for manufacturing silver-tin oxide electrical contact material | |
| JPS60181249A (en) | Electrical contact material made of oxidized and sintered ag-sn-pb alloy |