JP4198419B2 - Carbon-based sintered sliding plate material with wear resistance - Google Patents
Carbon-based sintered sliding plate material with wear resistance Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は、電気車のパンタグラフに取り付けられる耐摩耗性を有する集電用炭素系焼結すり板材料に関する。
【０００２】
【従来の技術】
電気車のパンタグラフに用いられるすり板は金属系材料が使用されていたが、架線の摩耗が著しいことなどにより、より摺動性に優れた炭素系材料に移行しつつある。
【０００３】
これらの炭素系材料は、主に銅などの金属と複合化させることにより、架線の摩耗を低減することの他、すり板自身も摩耗量の少ないものが望まれている。
【０００４】
焼結タイプのすり板は、銅を溶融、黒鉛内に含浸させるいわゆる含浸タイプのすり板に比べ、摩耗量が多くなるといわれており、焼結タイプでのすり板の使用は一部の電車路線に限定されるものであった。
【０００５】
これらを改善するために、例えば、特開平５−２８７３１８号公報には、金属粉末、窒化ホウ素粉末、炭素粉末らを混合、成形、焼成してなる炭素系集電摺動材で、窒化ホウ素を０．２〜８％混合することにより耐摩耗性が向上するものが開示されている。しかしながら、窒化ホウ素は絶縁材料であり、添加率増加とともに、電気比抵抗値が増加する傾向が見られ、集電性能の低下につながるという問題がある。
【０００６】
【発明が解決しようとする課題】
本発明は、低摩耗で低抵抗の耐摩耗性を有する炭素系焼結すり板材料を提供することを目的とする。
【０００７】
【課題を解決するための手段】
前記課題を解決するために、本発明者らは鋭意研究の結果、炭素比が増加すると、摩耗量が低下すること、この炭素粉末の黒鉛化度が摩耗量に影響を及ぼすことを見出し、本発明を完成した。
【０００８】
すなわち、本発明の耐摩耗性を有する炭素系焼結すり板材料は、炭素粉末３５〜５０重量部と、銅粉末６５〜５０重量部とを混合、成形後、前記成形したものを１０００℃で焼成することにより得られた炭素−銅複合材料によって形成され、前記炭素−銅複合材料は、Ｘ線回折法による炭素のｄ（００２）面間隔が０．３５〜０．３４５ｎｍのものであり、嵩密度が２．７〜３．５ｇ／ｃｍ３で、曲げ強さが１００ＭＰａ以上で、電気比抵抗が１．５μΩ・ｍ以下である。また、前記銅粉末が平均粒径１〜２５μｍであるものである。
【０００９】
炭素粉末の黒鉛化度を調整し、Ｘ線回折法による炭素のｄ（００２）面間隔が０．３５〜０．３４５ｎｍの炭素骨格とすることによって、従来の炭素系焼結すり板材料の摩耗量に比べ、同等以下とできる。また、平均粒径が１〜２５μｍの銅粉末を使用することにより、曲げ強さ１００ＭＰａ以上、電気比抵抗を１．５μΩ・ｍ以下とできる。すなわち、炭素粉末の黒鉛化度の最適化と銅粉末の粒径を細かくすることで、低摩耗、低抵抗の炭素系焼結すり板材料とすることができる。
【００１０】
本発明に使用される炭素原料としては、コークス、ピッチ、メソカーボンマイクロビーズ等が用いられ、特にコークスが好ましい。
【００１１】
また、銅粉末には、電解銅粉末、アトマイズド銅粉末のいずれをも使用することができるが、電解銅粉末はすり板の強度を向上させることができるので好ましい。アトマイズド銅粉末が球状であるのに対し、電解銅粉は樹枝状であるため、同一配合比の場合、炭素粉末とのからみが良く、かつ銅粉末同士の平均距離も近いので、機械的強さの向上、電気比抵抗の低減に効果的であるからである。
【００１２】
また、炭素粉末と銅粉末の比率は、焼成後の嵩密度が２．７〜３．５ｇ／ｃｍ3の範囲になるように混合される。また、銅粉末以外にも、チタン、鉄、ニッケル、スズ、モリブデン、コバルト、クロム、タングステン、銀等２％未満の金属元素の他、ＴｉＣ、ＴｉＮ、ＳｎＯ等の化合物、カーボンナノチューブ、天然黒鉛、人造黒鉛等を添加することもできる。
【００１３】
また、炭素のＸ線回折法による炭素のｄ（００２）面間隔が０．３５ｎｍより大きい場合は、自己潤滑性に乏しく、摩耗量が増加する。また、Ｘ線回折法による炭素のｄ（００２）面間隔が０．３４５ｎｍよりも小さい場合は、黒鉛化構造が発達し始めて柔らかくなり、摩耗量が増加する。
【００１４】
ここで、炭素のＸ線回折法による炭素のｄ（００２）面間隔を０．３５〜０．３４５ｎｍに調整するためには、炭素粉末を６００〜１４００℃で焼成することにより達成できる。
【００１５】
また、曲げ強さが１００ＭＰａ未満の場合は摩耗量が増加する。これは、耐摩耗性に寄与する炭素部分の脱落が起こりやすいためであると考えられる。
【００１６】
【実施例】
以下、実施例により本発明を具体的に説明する。
【００１７】
（実施例１）
Ｘ線回折法による炭素のｄ（００２）面間隔が０．３４８ｎｍの炭素粉末とバインダの計５０重量部と平均粒径３μｍの電解銅粉末５０重量部をハイスピードミキサーで混合し、金型にて３５００ｋｇ／ｃｍ2の圧力で１４０×２００×３０ｍｍに成形後、非酸化性雰囲気下、１０００℃にて焼成した。得られた試料のかさ密度は２．８ｇ／ｃｍ3、電気比抵抗１．５μΩ・ｍ、曲げ強さ１１５ＭＰａであった。なお、電気比抵抗はＪＩＳ Ｒ ７２０２により測定した。また、曲げ強さは３点曲げ試験により測定した。この試料を室温にて２０Ａ直流条件下、４００〜８００ｒｐｍの回転速度で回転するφ３１０ｍｍの銅円板に接触させて３０分間摺動試験を行い、重量変化から摩耗量を測定した。この際、回転体と試料との間で電流の流れない非接触時間を離線率とし、離線率５％及び１０％の時の摩耗量を測定した。各摩耗量は、それぞれ２．９ｃｍ3／ｋｇｆ／万ｋｍ、９．５ｃｍ3／ｋｇｆ／万ｋｍであった。
【００１８】
（実施例２）
Ｘ線回折法による炭素のｄ（００２）面間隔が０．３４８ｎｍの炭素粉末とバインダの計４０重量部と平均粒径３μｍの電解銅粉末６０重量部をハイスピードミキサーで混合し、金型にて３５００ｋｇ／ｃｍ2の圧力で１４０×２００×３０ｍｍに成形後、非酸化性雰囲気下、１０００℃にて焼成した。得られた試料のかさ密度は３．３ｇ／ｃｍ3、電気比抵抗０．８μΩ・ｍ、曲げ強さ１１１ＭＰａであった。この試料を実施例１と同様に、室温にて２０Ａ直流条件下、４００〜８００ｒｐｍの回転速度で回転するφ３１０ｍｍの銅円板に接触させて３０分間摺動試験を行い、重量変化から摩耗量を測定した。この際、回転体と試料との間で電流の流れない非接触時間を離線率とし、離線率５％及び１０％の時の摩耗量を測定した。各摩耗量は、それぞれ５．１ｃｍ3／ｋｇｆ／万ｋｍ、１２．０ｃｍ3／ｋｇｆ／万ｋｍであった。
【００１９】
（実施例３）
Ｘ線回折法による炭素のｄ（００２）面間隔が０．３４７ｎｍの炭素粉末とバインダの計４２重量部と平均粒径１５μｍの電解銅粉末５８重量部をハイスピードミキサーで混合し、金型にて３５００ｋｇ／ｃｍ2の圧力で１４０×２００×３０ｍｍに成形後、非酸化性雰囲気下、１０００℃にて焼成した。得られた試料のかさ密度は３．０ｇ／ｃｍ3、電気比抵抗１．３μΩ・ｍ、曲げ強さ１０５ＭＰａであった。この試料を実施例１と同様に、室温にて２０Ａ直流条件下、４００〜８００ｒｐｍの回転速度で回転するφ３１０ｍｍの銅円板に接触させて３０分間摺動試験を行い、重量変化から摩耗量を測定した。この際、回転体と試料との間で電流の流れない非接触時間を離線率とし、離線率５％及び１０％の時の摩耗量を測定した。各摩耗量は、それぞれ５．０ｃｍ3／ｋｇｆ／万ｋｍ、９．１ｃｍ3／ｋｇｆ／万ｋｍであった。
【００２０】
（実施例４）
Ｘ線回折法による炭素のｄ（００２）面間隔が０．３４８ｎｍの炭素粉末とバインダの計３５重量部と平均粒径１５μｍの電解銅粉末６５重量部をハイスピードミキサーで混合し、金型にて３５００ｋｇ／ｃｍ2の圧力で１４０×２００×３０ｍｍに成形後、非酸化性雰囲気下、１０００℃にて焼成した。得られた試料のかさ密度は３．５ｇ／ｃｍ3、電気比抵抗０．６μΩ・ｍ、曲げ強さ１００ＭＰａで、であった。この試料を実施例１と同様に、室温にて２０Ａ直流条件下、４００〜８００ｒｐｍの回転速度で回転するφ３１０ｍｍの銅円板に接触させて３０分間摺動試験を行い、重量変化から摩耗量を測定した。この際、回転体と試料との間で電流の流れない非接触時間を離線率とし、離線率５％及び１０％の時の摩耗量を測定した。各摩耗量は、それぞれ６．１ｃｍ3／ｋｇｆ／万ｋｍ、１２．０ｃｍ3／ｋｇｆ／万ｋｍであった。
【００２１】
（比較例１）
Ｘ線回折法による炭素のｄ（００２）面間隔が０．３３９ｎｍの炭素粉末とバインダの計５０重量部と平均粒径３０μｍの電解銅粉末５０重量部をハイスピードミキサーで混合し、金型にて３５００ｋｇ／ｃｍ2の圧力で１４０×２００×３０ｍｍに成形後、非酸化性雰囲気下、１０００℃にて焼成した。得られた試料のかさ密度は２．７ｇ／ｃｍ3、電気比抵抗３．７μΩ・ｍ、曲げ強さ８３ＭＰａであった。この試料を実施例１と同様に、室温にて２０Ａ直流条件下、４００〜８００ｒｐｍの回転速度で回転するφ３１０ｍｍの銅円板に接触させて３０分間摺動試験を行い、重量変化から摩耗量を測定した。この際、回転体と試料との間で電流の流れない非接触時間を離線率とし、離線率５％及び１０％の時の摩耗量を測定した。各摩耗量は、それぞれ１２．０ｃｍ3／ｋｇｆ／万ｋｍ、２０．１ｃｍ3／ｋｇｆ／万ｋｍであった。
【００２２】
（比較例２）
Ｘ線回折法による炭素のｄ（００２）面間隔が０．３４７ｎｍの炭素粉末とバインダの計２８重量部と平均粒径３μｍの電解銅粉末７２重量部をハイスピードミキサーで混合し、金型にて３５００ｋｇ／ｃｍ2の圧力で１４０×２００×３０ｍｍに成形後、非酸化性雰囲気下、１０００℃にて焼成した。得られた試料のかさ密度は３．８ｇ／ｃｍ3、電気比抵抗０．４μΩ・ｍ、曲げ強さ９５ＭＰａで、であった。この試料を実施例１と同様に、室温にて２０Ａ直流条件下、４００〜８００ｒｐｍの回転速度で回転するφ３１０ｍｍの銅円板に接触させて３０分間摺動試験を行い、重量変化から摩耗量を測定した。この際、回転体と試料との間で電流の流れない非接触時間を離線率とし、離線率５％及び１０％の時の摩耗量を測定した。各摩耗量は、それぞれ１０．４ｃｍ3／ｋｇｆ／万ｋｍ、２２．０ｃｍ3／ｋｇｆ／万ｋｍであった。
【００２３】
（比較例３）
Ｘ線回折法による炭素のｄ（００２）面間隔が０．３５３ｎｍの炭素粉末とバインダの計４０重量部と平均粒径３μｍの電解銅粉末６０重量部をハイスピードミキサーで混合し、金型にて３５００ｋｇ／ｃｍ2の圧力で１４０×２００×３０ｍｍに成形後、非酸化性雰囲気下、１０００℃にて焼成した。得られた試料のかさ密度は３．４ｇ／ｃｍ3、電気比抵抗０．８μΩ・ｍ、曲げ強さ９０ＭＰａであった。この試料を実施例１と同様に、室温にて２０Ａ直流条件下、４００〜８００ｒｐｍの回転速度で回転するφ３１０ｍｍの銅円板に接触させて３０分間摺動試験を行い、重量変化から摩耗量を測定した。この際、回転体と試料との間で電流の流れない非接触時間を離線率とし、離線率５％及び１０％の時の摩耗量を測定した。各摩耗量は、それぞれ１０．７ｃｍ3／ｋｇｆ／万ｋｍ、２５．０ｃｍ3／ｋｇｆ／万ｋｍであった。
【００２４】
以上の結果を表１にまとめて示す。
【００２５】
【表１】
表１よりわかるように、Ｘ線回折法による炭素のｄ（００２）面間隔が０．３５〜０．３４５ｎｍの範囲にある実施例１〜４の試料は、比較例１〜３の試料よりも離線率が５％及び１０％のいずれの場合も摩耗量が低減していることがわかる。
【００２７】
【発明の効果】
本発明の耐摩耗性を有する炭素系焼結すり板材料は、以上のように構成されており、Ｘ線回折法による炭素のｄ（００２）面間隔が０．３５〜０．３４５ｎｍの範囲となるように調整することによって、集電容量を低下させることなく、低摩耗、高強度、低抵抗の耐摩耗性を有する炭素系焼結すり板とすることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a current-collecting carbon-based sintered sliding plate material having wear resistance and attached to a pantograph of an electric vehicle.
[0002]
[Prior art]
Although the metal plate is used for the sliding plate used for the pantograph of an electric vehicle, it is shifting to the carbon-type material with more excellent slidability due to remarkable wear of the overhead wire.
[0003]
It is desired that these carbon-based materials are mainly combined with a metal such as copper to reduce the wear of the overhead wire and that the sliding plate itself has a small amount of wear.
[0004]
Sintered type sliding plates are said to wear more than so-called impregnated type sliding plates that melt copper and impregnate graphite. The use of sintered type sliding plates is part of the train route. It was limited to.
[0005]
In order to improve these, for example, Japanese Patent Laid-Open No. 5-287318 discloses a carbon-based current collector sliding material obtained by mixing, forming, and firing metal powder, boron nitride powder, and carbon powder. What improves abrasion resistance by mixing 0.2 to 8% is disclosed. However, boron nitride is an insulating material, and there is a problem that the electrical resistivity value tends to increase with an increase in the addition rate, leading to a decrease in current collecting performance.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a carbon-based sintered sliding plate material having low wear and low resistance wear resistance.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present inventors have intensively researched and found that when the carbon ratio increases, the wear amount decreases, and the graphitization degree of the carbon powder affects the wear amount. Completed the invention.
[0008]
That is, the wear-resistant carbon-based sintered ground plate material of the present invention is obtained by mixing and molding 35 to 50 parts by weight of carbon powder and 65 to 50 parts by weight of copper powder, and then molding the molded article at 1000 ° C. Formed of a carbon-copper composite material obtained by firing, wherein the carbon-copper composite material has a d (002) plane spacing of carbon of 0.35 to 0.345 nm by an X-ray diffraction method, The bulk density is 2.7 to 3.5 g / cm 3 , the bending strength is 100 MPa or more, and the electrical resistivity is 1.5 μΩ · m or less. Moreover, the said copper powder is an average particle diameter of 1-25 micrometers.
[0009]
By adjusting the degree of graphitization of the carbon powder and forming a carbon skeleton having a d (002) plane spacing of 0.35 to 0.345 nm by X-ray diffraction, the wear of the conventional carbon-based sintered strip material Compared to the amount, it can be equal or less. Further, by using copper powder having an average particle diameter of 1 to 25 μm, the bending strength can be 100 MPa or more and the electric specific resistance can be 1.5 μΩ · m or less. That is, by optimizing the graphitization degree of the carbon powder and reducing the particle size of the copper powder, a carbon-based sintered ground plate material with low wear and low resistance can be obtained.
[0010]
As the carbon raw material used in the present invention, coke, pitch, mesocarbon microbeads and the like are used, and coke is particularly preferable.
[0011]
Moreover, although either an electrolytic copper powder or an atomized copper powder can be used for the copper powder, the electrolytic copper powder is preferable because the strength of the sliding plate can be improved. Since the atomized copper powder is spherical, the electrolytic copper powder is dendritic, so in the case of the same blending ratio, the tangling with the carbon powder is good and the average distance between the copper powders is close, so the mechanical strength This is because it is effective in improving the resistance and reducing the electrical resistivity.
[0012]
Moreover, the ratio of carbon powder and copper powder is mixed so that the bulk density after baking may be in the range of 2.7 to 3.5 g / cm 3 . In addition to copper powder, titanium, iron, nickel, tin, molybdenum, cobalt, chromium, tungsten, silver and other metal elements of less than 2%, compounds such as TiC, TiN, SnO, carbon nanotubes, natural graphite, Artificial graphite or the like can also be added.
[0013]
Moreover, when the d (002) plane spacing of carbon by the X-ray diffraction method of carbon is larger than 0.35 nm, the self-lubricating property is poor and the amount of wear increases. Further, when the d (002) plane spacing of carbon by X-ray diffraction is smaller than 0.345 nm, the graphitized structure starts to develop and becomes soft, and the amount of wear increases.
[0014]
Here, in order to adjust the d (002) plane distance of carbon by 0.35 to 0.345 nm by the X-ray diffraction method of carbon, it can be achieved by firing carbon powder at 600 to 1400 ° C.
[0015]
Further, when the bending strength is less than 100 MPa, the wear amount increases. This is presumably because the carbon portion that contributes to wear resistance tends to fall off.
[0016]
【Example】
Hereinafter, the present invention will be described specifically by way of examples.
[0017]
(Example 1)
Carbon powder with an interval of d (002) plane of carbon of 0.348 nm by X-ray diffractometry and 50 parts by weight of binder and 50 parts by weight of electrolytic copper powder with an average particle diameter of 3 μm are mixed with a high-speed mixer and put into a mold. After being molded to 140 × 200 × 30 mm at a pressure of 3500 kg / cm 2 , it was fired at 1000 ° C. in a non-oxidizing atmosphere. The obtained sample had a bulk density of 2.8 g / cm 3 , an electrical resistivity of 1.5 μΩ · m, and a bending strength of 115 MPa. The electrical resistivity was measured according to JIS R 7202. The bending strength was measured by a three-point bending test. This sample was brought into contact with a φ310 mm copper disk rotating at a rotational speed of 400 to 800 rpm under a 20 A direct current condition at room temperature, and a sliding test was conducted for 30 minutes, and the amount of wear was measured from the change in weight. At this time, the non-contact time during which no current flows between the rotating body and the sample was defined as the separation rate, and the amount of wear when the separation rate was 5% and 10% was measured. Each wear amount, respectively 2.9 cm 3 / kgf / ten thousand km, was 9.5cm 3 / kgf / ten thousand km.
[0018]
(Example 2)
Carbon powder with a d (002) plane spacing of 0.348 nm by X-ray diffraction method and 40 parts by weight of a binder and 60 parts by weight of electrolytic copper powder with an average particle size of 3 μm are mixed with a high speed mixer and put into a mold. After being molded to 140 × 200 × 30 mm at a pressure of 3500 kg / cm 2 , it was fired at 1000 ° C. in a non-oxidizing atmosphere. The obtained sample had a bulk density of 3.3 g / cm 3 , an electrical resistivity of 0.8 μΩ · m, and a bending strength of 111 MPa. As in Example 1, this sample was brought into contact with a φ310 mm copper disk rotating at a rotational speed of 400 to 800 rpm under a 20 A direct current condition at room temperature, and a sliding test was performed for 30 minutes. It was measured. At this time, the non-contact time during which no current flows between the rotating body and the sample was defined as the separation rate, and the amount of wear when the separation rate was 5% and 10% was measured. The respective wear amounts were 5.1 cm 3 / kgf / 10,000 km and 12.0 cm 3 / kgf / 10,000 km, respectively.
[0019]
(Example 3)
Carbon powder with a d (002) plane spacing of 0.347 nm by X-ray diffractometry, 42 parts by weight of binder and 58 parts by weight of electrolytic copper powder with an average particle size of 15 μm were mixed with a high speed mixer, and the resulting mixture was put into a mold. After being molded to 140 × 200 × 30 mm at a pressure of 3500 kg / cm 2 , it was fired at 1000 ° C. in a non-oxidizing atmosphere. The obtained sample had a bulk density of 3.0 g / cm 3 , an electrical resistivity of 1.3 μΩ · m, and a bending strength of 105 MPa. As in Example 1, this sample was brought into contact with a φ310 mm copper disk rotating at a rotational speed of 400 to 800 rpm under a 20 A direct current condition at room temperature, and a sliding test was performed for 30 minutes. It was measured. At this time, the non-contact time during which no current flows between the rotating body and the sample was defined as the separation rate, and the amount of wear when the separation rate was 5% and 10% was measured. Each wear amount was 5.0 cm 3 / kgf / 10,000 km and 9.1 cm 3 / kgf / 10,000 km, respectively.
[0020]
Example 4
Carbon powder with an interval of d (002) plane of carbon of 0.348 nm by X-ray diffractometry and 35 parts by weight of binder and 65 parts by weight of electrolytic copper powder with an average particle size of 15 μm are mixed with a high-speed mixer and put into a mold. After being molded to 140 × 200 × 30 mm at a pressure of 3500 kg / cm 2 , it was fired at 1000 ° C. in a non-oxidizing atmosphere. The obtained sample had a bulk density of 3.5 g / cm 3 , an electrical resistivity of 0.6 μΩ · m, and a bending strength of 100 MPa. As in Example 1, this sample was brought into contact with a φ310 mm copper disk rotating at a rotational speed of 400 to 800 rpm under a 20 A direct current condition at room temperature, and a sliding test was performed for 30 minutes. It was measured. At this time, the non-contact time during which no current flows between the rotating body and the sample was defined as the separation rate, and the amount of wear when the separation rate was 5% and 10% was measured. Each wear amount was 6.1 cm 3 / kgf / 10,000 km and 12.0 cm 3 / kgf / 10,000 km, respectively.
[0021]
(Comparative Example 1)
Carbon powder having a d (002) plane spacing of 0.339 nm by X-ray diffractometry and 50 parts by weight of a binder and 50 parts by weight of electrolytic copper powder with an average particle size of 30 μm are mixed with a high-speed mixer to form a mold. After being molded to 140 × 200 × 30 mm at a pressure of 3500 kg / cm 2 , it was fired at 1000 ° C. in a non-oxidizing atmosphere. The obtained sample had a bulk density of 2.7 g / cm 3 , an electrical resistivity of 3.7 μΩ · m, and a bending strength of 83 MPa. As in Example 1, this sample was brought into contact with a φ310 mm copper disk rotating at a rotational speed of 400 to 800 rpm under a 20 A direct current condition at room temperature, and a sliding test was performed for 30 minutes. It was measured. At this time, the non-contact time during which no current flows between the rotating body and the sample was defined as the separation rate, and the amount of wear when the separation rate was 5% and 10% was measured. Each wear amount, respectively 12.0 cm 3 / kgf / ten thousand km, was 20.1cm 3 / kgf / ten thousand km.
[0022]
(Comparative Example 2)
Carbon powder by X-ray diffraction method with a d (002) plane spacing of 0.347 nm, a total of 28 parts by weight of binder and 72 parts by weight of electrolytic copper powder with an average particle size of 3 μm were mixed with a high speed mixer, After being molded to 140 × 200 × 30 mm at a pressure of 3500 kg / cm 2 , it was fired at 1000 ° C. in a non-oxidizing atmosphere. The bulk density of the obtained sample was 3.8 g / cm 3 , electrical specific resistance 0.4 μΩ · m, and bending strength 95 MPa. As in Example 1, this sample was brought into contact with a φ310 mm copper disk rotating at a rotational speed of 400 to 800 rpm under a 20 A direct current condition at room temperature, and a sliding test was performed for 30 minutes. It was measured. At this time, the non-contact time during which no current flows between the rotating body and the sample was defined as the separation rate, and the amount of wear when the separation rate was 5% and 10% was measured. The respective wear amounts were 10.4 cm 3 / kgf / 10,000 km and 22.0 cm 3 / kgf / 10,000 km, respectively.
[0023]
(Comparative Example 3)
Carbon powder with a d (002) plane spacing of 0.353 nm by X-ray diffractometry and 40 parts by weight of a binder and 60 parts by weight of electrolytic copper powder with an average particle size of 3 μm were mixed with a high speed mixer, and the resulting mixture was put into a mold. After being molded to 140 × 200 × 30 mm at a pressure of 3500 kg / cm 2 , it was fired at 1000 ° C. in a non-oxidizing atmosphere. The obtained sample had a bulk density of 3.4 g / cm 3 , an electrical resistivity of 0.8 μΩ · m, and a bending strength of 90 MPa. As in Example 1, this sample was brought into contact with a φ310 mm copper disk rotating at a rotational speed of 400 to 800 rpm under a 20 A direct current condition at room temperature, and a sliding test was performed for 30 minutes. It was measured. At this time, the non-contact time during which no current flows between the rotating body and the sample was defined as the separation rate, and the amount of wear when the separation rate was 5% and 10% was measured. The respective wear amounts were 10.7 cm 3 / kgf / 10,000 km and 25.0 cm 3 / kgf / 10,000 km, respectively.
[0024]
The above results are summarized in Table 1.
[0025]
[Table 1]
As can be seen from Table 1, the samples of Examples 1 to 4 where the d (002) plane spacing of carbon by the X-ray diffraction method is in the range of 0.35 to 0.345 nm are more than the samples of Comparative Examples 1 to 3. It can be seen that the amount of wear is reduced when the separation rate is 5% and 10%.
[0027]
【The invention's effect】
The wear-resistant carbon-based sintered sliding plate material of the present invention is configured as described above, and the d (002) plane spacing of carbon by the X-ray diffraction method is in the range of 0.35 to 0.345 nm. By adjusting in such a manner, it is possible to obtain a carbon-based sintered sliding plate having low wear, high strength, and low resistance wear resistance without reducing the current collecting capacity.
Claims (2)
前記炭素−銅複合材料は、Ｘ線回折法による炭素のｄ（００２）面間隔が０．３５〜０．３４５ｎｍのものであり、
嵩密度が２．７〜３．５ｇ／ｃｍ３で、曲げ強さが１００ＭＰａ以上で、電気比抵抗が１．５μΩ・ｍ以下である耐摩耗性を有する炭素系焼結すり板材料。It is formed of a carbon-copper composite material obtained by mixing and molding 35 to 50 parts by weight of carbon powder and 65 to 50 parts by weight of copper powder, and then firing the molded article at 1000 ° C.,
The carbon-copper composite material has a carbon d (002) plane spacing of 0.35 to 0.345 nm by X-ray diffraction.
A carbon-based sintered ground plate material having wear resistance having a bulk density of 2.7 to 3.5 g / cm 3 , a bending strength of 100 MPa or more, and an electric specific resistance of 1.5 μΩ · m or less.
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