JPH035011B2 - - Google Patents
Info
- Publication number
- JPH035011B2 JPH035011B2 JP10729586A JP10729586A JPH035011B2 JP H035011 B2 JPH035011 B2 JP H035011B2 JP 10729586 A JP10729586 A JP 10729586A JP 10729586 A JP10729586 A JP 10729586A JP H035011 B2 JPH035011 B2 JP H035011B2
- Authority
- JP
- Japan
- Prior art keywords
- tungsten
- carbide layer
- tungsten carbide
- electrical contact
- 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
- 239000000463 material Substances 0.000 claims description 31
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 26
- 229910052721 tungsten Inorganic materials 0.000 claims description 21
- 239000010937 tungsten Substances 0.000 claims description 21
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 20
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 20
- 229910052759 nickel Inorganic materials 0.000 claims description 13
- 238000007747 plating Methods 0.000 claims description 12
- 238000005260 corrosion Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 235000019441 ethanol Nutrition 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000005255 carburizing Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000080590 Niso Species 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 150000003657 tungsten Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Contacts (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は自動車の電装品等に使用される電気接
点材料に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to electrical contact materials used in electrical components of automobiles and the like.
［従来の技術］
自動車の電装品等の電気接点材料として従来広
く使用されたのはタングステン接点である。タン
グステンは耐アーク性にすぐれ、消耗量が少ない
が、一方常温で酸化しやすく酸化による導通不良
が生じるという問題点がある。[Prior Art] Tungsten contacts have been widely used as electrical contact materials for automobile electrical components and the like. Tungsten has excellent arc resistance and wears less, but has the problem that it is easily oxidized at room temperature, causing poor conductivity due to oxidation.
これを改良するものとして、タングステン接点
材料の表面に炭化タングステン層を形成した電気
接点材料が知られている（特公昭49−20128号）。
このものは従来のタングステン接点材料に較べて
耐酸化性にすぐれ、消耗量は同等であるとされて
いる。 To improve this, an electrical contact material in which a tungsten carbide layer is formed on the surface of a tungsten contact material is known (Japanese Patent Publication No. 49-20128).
This material has superior oxidation resistance and is said to have the same amount of wear as conventional tungsten contact materials.
［発明が解決しようとする問題点］
しかしながら、上記表面に炭化タングステン層
を形成したタングステンからなる電気接点材料
は、炭化タングステン層の働きにより耐蝕性が改
良されるとはいうものの未だ充分ではなく、使用
条件によつては依然として導通不良が生じること
が多かつた。表面の炭化タングステン層の厚みを
増せば耐蝕性は若干改良されるが、材質的に脆く
なり、使用中に割れが発生しやすくなるという問
題点があつた。[Problems to be Solved by the Invention] However, although the electrical contact material made of tungsten with a tungsten carbide layer formed on its surface has improved corrosion resistance due to the action of the tungsten carbide layer, it is still insufficient. Depending on the conditions of use, poor continuity still often occurred. If the thickness of the tungsten carbide layer on the surface was increased, the corrosion resistance would be slightly improved, but there was a problem that the material would become brittle and cracks would easily occur during use.
［問題点を解決するための手段］
上記問題点を解決するため本発明は次のような
構成を採用した。[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following configuration.
すなわち、本発明にかかる電気接点材料は、タ
ングステン接点材料の表面に炭化タングステン層
を形成し、さらにその外面にニツケルメツキ層を
形成したことを特徴としている。 That is, the electrical contact material according to the present invention is characterized in that a tungsten carbide layer is formed on the surface of the tungsten contact material, and a nickel plating layer is further formed on the outer surface of the tungsten carbide layer.
タングステン材料の表面に形成する炭化タング
ステン層の厚みは0.5〜1.5ミクロンとするのが好
ましい。この層の厚みが0.5ミクロンよりも薄い
場合は耐蝕性等の面で充分ではなく、1.5ミクロ
ンより厚くなりと材質的に脆くなり、割れが生じ
やすくなる。 The thickness of the tungsten carbide layer formed on the surface of the tungsten material is preferably 0.5 to 1.5 microns. If the thickness of this layer is less than 0.5 microns, it will not be sufficient in terms of corrosion resistance, and if it is thicker than 1.5 microns, the material will become brittle and cracks will easily occur.
また、ニツケルメツキ層の厚みは0.5〜3.0ミク
ロンとするのが好ましい。ニツケルメツキ層の厚
みが0.5ミクロンよりも薄いと耐蝕性が充分では
なく、逆に3.0ミクロンよりも厚くすると剥離し
やすくなるとともに耐アーク性が低下する傾向が
ある。 Further, the thickness of the nickel plating layer is preferably 0.5 to 3.0 microns. If the thickness of the nickel plating layer is less than 0.5 microns, the corrosion resistance will not be sufficient, and if it is thicker than 3.0 microns, it will tend to peel off easily and the arc resistance will decrease.
一般に、タングステン接点材料の表面にニツケ
ル、金、銀等のメツキを施すと、タングステン特
有の耐アーク性が失なわれて電気接点としての性
能が低下すると考えられており、例えばろう接部
にニツケルメツキを施して耐蝕性を向上させる場
合にも電極面として作用する部分には被覆しない
ように工夫したタングステン接点が提案されてい
る（特公昭57−21212号）。 It is generally believed that if the surface of tungsten contact material is plated with nickel, gold, silver, etc., the arc resistance characteristic of tungsten will be lost and the performance as an electrical contact will deteriorate. A tungsten contact has been proposed in which the part that acts as the electrode surface is not coated even when the corrosion resistance is improved by coating (Japanese Patent Publication No. 57-21212).
本発明はこのような従来の常識を打ち破るもの
で、炭化タングステン層とニツケル層を重ね合わ
せることにより、耐アーク性を損なわず耐蝕性を
向上させることができることを見出して完成した
のである。以下、本発明の実施例について説明す
る。 The present invention breaks through such conventional wisdom and was completed by discovering that by overlapping a tungsten carbide layer and a nickel layer, corrosion resistance can be improved without impairing arc resistance. Examples of the present invention will be described below.
［実施例］
外径４mm、厚み１mmの純タングステン円板に前
処理として公知のバレル研磨を施してのち、第１
図に示すような電気炉１を用いて浸炭を行なつ
た。この電気炉１には水素ガス４がエチルアルコ
ール２を容れたポツト３を通して供給される。エ
チルアルコールにバブリングされた水素ガスはエ
チルアルコールの蒸気を含んで電気炉内に送り込
まれる。[Example] A pure tungsten disk with an outer diameter of 4 mm and a thickness of 1 mm was subjected to well-known barrel polishing as a pretreatment.
Carburizing was performed using an electric furnace 1 as shown in the figure. Hydrogen gas 4 is supplied to this electric furnace 1 through a pot 3 containing ethyl alcohol 2. The hydrogen gas bubbled into ethyl alcohol contains ethyl alcohol vapor and is sent into the electric furnace.
一方、前記タングステン円板を載せた黒鉛ボー
トが電気炉１内に装入され炉内においてエチルア
ルコールによる表面浸炭が行なわれる。電気炉内
において1120℃で３時間の加熱を行なうとタング
ステン円板の表面に0.8〜1.0ミクロンの炭化タン
グステン層が形成された。 On the other hand, the graphite boat carrying the tungsten disk is loaded into the electric furnace 1, and the surface is carburized with ethyl alcohol in the furnace. When heated in an electric furnace at 1120°C for 3 hours, a tungsten carbide layer of 0.8 to 1.0 microns was formed on the surface of the tungsten disk.
つぎにこのタングステン円板に電解ガラメツキ
を施した。メツキ条件は次のようであつた。 Next, this tungsten disk was electrolytically plated. The metsuki conditions were as follows.
メツキ液組成
NiSO4・7H2O 150ｇｒ
NiCl2・6H2O 75ｇｒ
H3BO3 20ｇｒ
H2O 1000ml
液 温 40〜50℃ｖ
2.5〜3.0
電 流 ８〜12A
時 間 30〜60分
このメツキ処理により、第２図に模式的に示す
如くタングステン基材５の表面に均一な炭化タン
グステン層６とニツケルメツキ層７が形成された
電気接点材料１０が得られた。Plating liquid composition NiSO 4・7H 2 O 150gr NiCl 2・6H 2 O 75gr H 3 BO 3 20gr H 2 O 1000ml Liquid temperature 40 to 50℃ V 2.5 to 3.0 Current 8 to 12A Time 30 to 60 minutes This plating process As a result, an electrical contact material 10 was obtained in which a uniform tungsten carbide layer 6 and a nickel plating layer 7 were formed on the surface of a tungsten base material 5, as schematically shown in FIG.
このようにして得られた電気接点材料について
耐蝕性試験を行なつた結果は第３図に示す通りで
あつた。同図には比較のため、純タングステン材
料、タングステン材料の表面に炭化タングステン
層のみを形成したもの（比較例１）およびタング
ステン材料の表面にニツケルメツキ層のみを形成
したものの成績を併記した。 The electrical contact material thus obtained was subjected to a corrosion resistance test, and the results were as shown in FIG. For comparison, the figure also shows the results of a pure tungsten material, a material in which only a tungsten carbide layer was formed on the surface of the tungsten material (Comparative Example 1), and a material in which only a nickel plating layer was formed on the surface of the tungsten material.
なお、試験条件は、各サンプルを純水の入つた
デンケータ中（湿度90％）に入れて密閉し、この
デシケータごと定温乾燥器（温度40℃）に入れて
所定時間放置（暴露日数）したのち、接触圧力
500〜800ｇｒで接触抵抗を測定した。 The test conditions were that each sample was placed in a desiccator containing pure water (humidity 90%), sealed, and the entire desiccator was placed in a constant temperature dryer (temperature 40°C) and left for a specified period of time (number of days of exposure). , contact pressure
Contact resistance was measured at 500-800 gr.
第３図からわかるように、接触抵抗が無限大に
なるまでの暴露日数は蒸気比較例１（炭化タング
ステン層0.8〜1.0μｍ）が18日、比較例２（ニツケ
ルメツキ層0.5〜1.0μｍ）が21日であるのに対し、
実施例１（炭化タングステン層0.8〜1.0μｍ＋ニツ
ケルメツキ層0.5〜1.0μｍ）が46日、実施例２（炭
化タングステン層0.8〜1.0μｍ＋ニツケルメツキ
層1.5〜2.0μｍ）が70日であつた。なお、耐アー
ク性はいずれもタングステン材料のみの場合とほ
ぼ同様であつた。 As can be seen from Figure 3, the number of days of exposure until the contact resistance reached infinity was 18 days for Steam Comparative Example 1 (tungsten carbide layer 0.8 to 1.0 μm) and 21 days for Comparative Example 2 (nickel plating layer 0.5 to 1.0 μm). While the day is
Example 1 (tungsten carbide layer 0.8-1.0 μm + nickel plating layer 0.5-1.0 μm) took 46 days, and Example 2 (tungsten carbide layer 0.8-1.0 μm + nickel plating layer 1.5-2.0 μm) took 70 days. Note that the arc resistance was almost the same as in the case of only tungsten material.
［発明の効果］
以上の説明から明らかなように、本発明にかか
る電気接点材料は、表面に炭化タングステン層を
形成した従来のタングステン接点材料に較べて、
耐アーク性が損なわれることなく耐蝕性が大幅に
向上した。この電気接点材料をホーン以外の自動
車用電装品その他の接点として使用するに適した
ものであることは明らかである。[Effects of the Invention] As is clear from the above description, the electrical contact material according to the present invention has the following advantages compared to the conventional tungsten contact material in which a tungsten carbide layer is formed on the surface.
Corrosion resistance has been significantly improved without sacrificing arc resistance. It is clear that this electrical contact material is suitable for use as contacts for automotive electrical components other than horns and other electrical components.
第１図は炭化タングステン層形成用の浸炭装置
の１例をあらわす説明図、第２図は得られた電気
接点材料の構造を模式的にあらわした断面図、第
３図は耐蝕性試験結果をあらわすグラフである。
１……電気炉、３……ポツト、６……炭化タン
グステン層、７……ニツケルメツキ層、１０……
電気接点材料。
Fig. 1 is an explanatory diagram showing an example of a carburizing device for forming a tungsten carbide layer, Fig. 2 is a sectional view schematically showing the structure of the obtained electrical contact material, and Fig. 3 shows the results of a corrosion resistance test. This is a graph that represents this. 1... Electric furnace, 3... Pot, 6... Tungsten carbide layer, 7... Nickel metal layer, 10...
Electrical contact materials.
Claims (1)
テン層を形成し、さらにその外面にニツケルメツ
キ層を形成したことを特徴とする電気接点材料。 ２ 炭化タングステン層の厚みが0.5乃至1.5ミク
ロンである特許請求の範囲第１項記載の電気接点
材料。 ３ ニツケルメツキ層の厚みが0.5乃至3.0ミクロ
ンである特許請求の範囲第１項または第２項記載
の電気接点材料。[Scope of Claims] 1. An electrical contact material characterized in that a tungsten carbide layer is formed on the surface of the tungsten contact material, and a nickel plating layer is further formed on the outer surface of the tungsten carbide layer. 2. The electrical contact material according to claim 1, wherein the tungsten carbide layer has a thickness of 0.5 to 1.5 microns. 3. The electrical contact material according to claim 1 or 2, wherein the nickel plating layer has a thickness of 0.5 to 3.0 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10729586A JPS62264514A (en) | 1986-05-10 | 1986-05-10 | Electric contact material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10729586A JPS62264514A (en) | 1986-05-10 | 1986-05-10 | Electric contact material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62264514A JPS62264514A (en) | 1987-11-17 |
| JPH035011B2 true JPH035011B2 (en) | 1991-01-24 |
Family
ID=14455480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10729586A Granted JPS62264514A (en) | 1986-05-10 | 1986-05-10 | Electric contact material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62264514A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110291606B (en) | 2017-02-22 | 2021-11-19 | 三菱电机株式会社 | Contact material, method for producing the same, and vacuum valve |
-
1986
- 1986-05-10 JP JP10729586A patent/JPS62264514A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62264514A (en) | 1987-11-17 |
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