JPS6252407B2 - - Google Patents
Info
- Publication number
- JPS6252407B2 JPS6252407B2 JP6955277A JP6955277A JPS6252407B2 JP S6252407 B2 JPS6252407 B2 JP S6252407B2 JP 6955277 A JP6955277 A JP 6955277A JP 6955277 A JP6955277 A JP 6955277A JP S6252407 B2 JPS6252407 B2 JP S6252407B2
- Authority
- JP
- Japan
- Prior art keywords
- tin
- tin oxide
- silver
- internal oxidation
- contact material
- 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
Links
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 14
- 229910001887 tin oxide Inorganic materials 0.000 claims description 14
- 230000003647 oxidation Effects 0.000 claims description 13
- 238000007254 oxidation reaction Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- IVQODXYTQYNJFI-UHFFFAOYSA-N oxotin;silver Chemical compound [Ag].[Sn]=O IVQODXYTQYNJFI-UHFFFAOYSA-N 0.000 claims description 5
- QCEUXSAXTBNJGO-UHFFFAOYSA-N [Ag].[Sn] Chemical compound [Ag].[Sn] QCEUXSAXTBNJGO-UHFFFAOYSA-N 0.000 claims description 4
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910001316 Ag alloy Inorganic materials 0.000 description 6
- 238000009792 diffusion process Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 229910001128 Sn alloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Manufacture Of Switches (AREA)
Description
本発明は、内部酸化法によつて製造される銀―
酸化錫基合金の電気接点材料の製造方法に係る。
従来、銀―酸化錫系電気接点材料は、低温度の
300〜500℃で内部酸化法にて作られていた。
然し乍ら銀合金の中心部に酸化物の稀薄な部分
が生じ、接点として使用中に消耗してこの稀薄な
部分に達すると、接点性能が著しく劣化するもの
である。この為接点として使用できる厚みは、接
点材料の略半分となる欠点があつた。
そこで、接点材料の中心部に酸化錫の稀薄な部
分が生じないようにする為に、内部酸化工程の前
に接点材料を二枚合せ、合せた周囲を溶接して一
定時間内部酸化し、然る後周囲の合せ部を切断し
て外す方法が試みられていたが、甚だ生産性が悪
いという欠点があつた。
本発明の目的は、上記方法の欠点を解消するこ
とのできる銀―酸化錫基合金電気接点材料の製造
方法を提供するにある。
本発明による銀―酸化錫基合金電気接点材料の
製造方法は、錫５〜15重量％を含む銀―錫基合金
を酸化性雰囲気で内部酸化が進行しない高温度に
加熱してその全表面に酸化錫の被膜を生成した
後、接点として使用する面のみその酸化錫の被膜
を除去し内部酸化が進行する低温度に加熱して内
部酸化することを特徴とするものである。
本発明の製造方法に於いて、上述の如く錫の含
有率を限定した理由は、錫が５重量％未満では酸
素の浸入を防ぐ緻密な酸化錫の被膜を表面に生成
することができず、15重量％を超えると表面に生
成した酸化錫の被膜を除去しても内部酸化ができ
ないからである。
酸化錫の被膜は銀合金の表面において銀合金中
に拡散しようとする酸素の拡散速度が銀合金中の
錫の拡散速度よりも小さい時に銀合金の表面に酸
化錫が集積し被膜となる。これを積極的に作るに
は、銀合金中の錫の拡散速度を上げ、酸素濃度を
低めにすればよいので、500℃以上の高温で大気
中が好ましい。
また内部酸化をするには酸素濃度を高くし、
300〜500℃の低温度が好ましい。
本発明の製造方法は、所謂片面からの酸化法で
あるが、従来のようにを、溶接加工工程を必要と
せず且つ中心部に稀薄な部分の発生しない極めて
生産性の高い製造方法である。
次に本発明の製造方法の効果を明瞭ならしめる
為に、その具体的な実施例について説明する。
下表の左欄に示すNo.１〜No.７か本発明による具
体的な実施例で、これらは溶解鋳造した後、圧延
加工にて１mm厚の板になし、次に600℃、大気中
で30分で加熱し、合金表面に酸化錫の被膜を生成
した後、片面及び周面にテープを付着し、塩酸に
浸漬して接点として使用する側の一面の酸化錫被
膜を溶し去り、次いで９Kg／cm2の酸素雰囲気中で
450℃に加熱し、300時間保持して内部酸化して、
銀―酸化錫基合金電気接点材料を得た。然してこ
の電気接点材料を切断して内部酸化した部分の厚
さを100倍の顕微鏡で測定したところ、下表の右
欄に示すような結果を得た。
The present invention relates to silver produced by an internal oxidation method.
The present invention relates to a method for manufacturing a tin oxide-based alloy electrical contact material. Conventionally, silver-tin oxide-based electrical contact materials have been used for low-temperature
It was made using an internal oxidation method at 300-500℃. However, a thin part of the oxide is formed in the center of the silver alloy, and when the silver alloy is worn out during use as a contact and reaches this thin part, the contact performance deteriorates significantly. Therefore, the thickness that can be used as a contact point is approximately half that of the contact material. Therefore, in order to prevent a thin part of tin oxide from forming in the center of the contact material, before the internal oxidation process, two pieces of contact material are put together, the combined periphery is welded, and internally oxidized for a certain period of time. Attempts have been made to remove the mating part by cutting the surrounding joints after it has been removed, but this method has the drawback of extremely poor productivity. An object of the present invention is to provide a method for producing a silver-tin oxide-based alloy electrical contact material that can overcome the drawbacks of the above-mentioned methods. The method for producing a silver-tin oxide-based alloy electrical contact material according to the present invention involves heating a silver-tin-based alloy containing 5 to 15% by weight of tin in an oxidizing atmosphere to a high temperature at which internal oxidation does not proceed. After forming a tin oxide film, the tin oxide film is removed only from the surface to be used as a contact, and internal oxidation is carried out by heating to a low temperature at which internal oxidation progresses. In the manufacturing method of the present invention, the reason why the tin content is limited as described above is that if the tin content is less than 5% by weight, a dense tin oxide film that prevents oxygen from penetrating cannot be formed on the surface. This is because if the content exceeds 15% by weight, internal oxidation cannot occur even if the tin oxide film formed on the surface is removed. A tin oxide film is formed by accumulating tin oxide on the surface of a silver alloy when the diffusion rate of oxygen trying to diffuse into the silver alloy is smaller than the diffusion rate of tin in the silver alloy. To actively produce this, it is necessary to increase the diffusion rate of tin in the silver alloy and lower the oxygen concentration, so it is preferable to use it in the atmosphere at a high temperature of 500°C or higher. In addition, for internal oxidation, increase the oxygen concentration,
Low temperatures of 300-500°C are preferred. The manufacturing method of the present invention is a so-called single-sided oxidation method, but it is an extremely productive manufacturing method that does not require a welding process and does not produce a thin part in the center unlike the conventional method. Next, in order to clarify the effects of the manufacturing method of the present invention, specific examples will be described. No. 1 to No. 7 shown in the left column of the table below are specific examples according to the present invention. After melting and casting, these were rolled into a 1 mm thick plate, and then heated at 600°C in the atmosphere. After heating for 30 minutes to form a tin oxide film on the alloy surface, tape was attached to one side and the circumferential surface, and the tin oxide film on the side to be used as a contact was dissolved away by dipping in hydrochloric acid. Then in an oxygen atmosphere of 9Kg/ cm2
Heat to 450℃ and hold for 300 hours for internal oxidation.
A silver-tin oxide based alloy electrical contact material was obtained. However, when this electrical contact material was cut and the thickness of the internally oxidized portion was measured using a 100x microscope, the results shown in the right column of the table below were obtained.
【表】【table】
【表】
また実施例と同じ銀―錫合金の板を700℃、９
Kg／cm2の酸素雰囲気中で300時間加熱し内部酸化
した部分の厚さを100倍の顕微鏡で測定してみた
が薄くて測定できなかつた。
さらに実施例と同じ銀―錫合金の板を450℃、
９Kg／cm2の酸素雰囲気中で300時間加熱し内部酸
化し100倍の顕微鏡で観察したところ、中心部に
約0.1mmの厚さの酸化錫の稀薄部分が生じてい
た。
以上の説明で判るように本発明の製造方法によ
れば中心部に酸化錫の稀薄な部分を有さない銀―
酸化錫基合金電気接点材料を容易に得ることがで
きるという優れた効果がある。[Table] In addition, the same silver-tin alloy plate as in the example was heated at 700℃ for 9
I tried measuring the thickness of the internally oxidized part after heating it in an oxygen atmosphere of Kg/cm 2 for 300 hours with a 100x microscope, but it was too thin to measure. Furthermore, the same silver-tin alloy plate as in the example was heated at 450°C.
When it was internally oxidized by heating in an oxygen atmosphere of 9 kg/cm 2 for 300 hours and observed under a microscope with a magnification of 100 times, a thin portion of tin oxide with a thickness of about 0.1 mm had formed in the center. As can be seen from the above explanation, according to the production method of the present invention, silver that does not have a thin portion of tin oxide in the center.
This has the excellent effect that a tin oxide-based alloy electrical contact material can be easily obtained.
Claims (1)
雰囲気で内部酸化が進行しない高温度に加熱しそ
の全表面に酸化錫の被膜を生成した後、接点とし
て使用する面のみその酸化錫の被膜を除去し内部
酸化が進行する低温度に加熱して内部酸化するこ
とを特徴とする銀―酸化錫基合金電気接点材料の
製造方法。1 A silver-tin-based alloy containing 5 to 15% by weight of tin is heated in an oxidizing atmosphere to a high temperature at which internal oxidation does not proceed to form a film of tin oxide on its entire surface, and then only the surface to be used as a contact is oxidized. A method for producing a silver-tin oxide-based alloy electrical contact material, which comprises removing a tin film and heating to a low temperature at which internal oxidation progresses for internal oxidation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6955277A JPS544368A (en) | 1977-06-13 | 1977-06-13 | Method of making electric contact material using silverrtin oxide based alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6955277A JPS544368A (en) | 1977-06-13 | 1977-06-13 | Method of making electric contact material using silverrtin oxide based alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS544368A JPS544368A (en) | 1979-01-13 |
| JPS6252407B2 true JPS6252407B2 (en) | 1987-11-05 |
Family
ID=13405997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6955277A Granted JPS544368A (en) | 1977-06-13 | 1977-06-13 | Method of making electric contact material using silverrtin oxide based alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS544368A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100584876B1 (en) * | 1997-11-25 | 2007-04-19 | 두산인프라코어 주식회사 | Combined structure of feed tube and steel boss made of composite material |
-
1977
- 1977-06-13 JP JP6955277A patent/JPS544368A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS544368A (en) | 1979-01-13 |
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