JP2005047760A - Copper-coated graphite powder and method of manufacturing the same - Google Patents
Copper-coated graphite powder and method of manufacturing the same Download PDFInfo
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本発明は、焼結機械部品、焼結軸受等の製造に用いる粉末冶金用銅被覆黒鉛粉末に関し、特に見掛密度及びタップ密度に優れた銅被覆黒鉛粉末及び同銅被覆黒鉛粉末を安定して製造できる製造方法に関する。 The present invention relates to a copper-coated graphite powder for powder metallurgy used in the manufacture of sintered machine parts, sintered bearings, and the like, and in particular, stable copper-coated graphite powder and copper-coated graphite powder excellent in apparent density and tap density. The present invention relates to a manufacturing method that can be manufactured.
粉末冶金材料への黒鉛添加手段として銅被覆黒鉛が知られている。この銅被覆黒鉛は、銅被覆層が当該材料のマトリックス成分と焼結することで、黒鉛単独に比べて高い強度が得られる利点があり、軸受材料を中心に使用されている。
一般に、焼結軸受材料に潤滑助剤の目的で添加する黒鉛には、鱗片状の天然黒鉛が多く使用されるが、鱗片状であるその形状に起因して見掛密度が低く、嵩があるために、マトリックス成分粉末との混合において分散性が悪く偏析が生じやすいという問題がある。
特に、マトリックス成分粉末がアトマイズ粉による球状粉末のように高見掛密度である場合、銅被覆黒鉛との見掛密度の差が大きいために分散性がより悪化する。
Copper-coated graphite is known as a means for adding graphite to powder metallurgy materials. This copper-coated graphite has an advantage that a higher strength can be obtained compared to graphite alone by sintering the copper coating layer with the matrix component of the material, and is mainly used for bearing materials.
Generally, scaly natural graphite is often used for graphite to be added to sintered bearing materials for the purpose of lubrication aid, but due to its scaly shape, the apparent density is low and bulky. Therefore, there is a problem that segregation is likely to occur due to poor dispersibility in mixing with the matrix component powder.
In particular, when the matrix component powder has a high apparent density such as a spherical powder of atomized powder, the dispersibility is further deteriorated due to the large difference in the apparent density from the copper-coated graphite.
銅被覆黒鉛粉末の製造方法の中で、製造コストが安価で大量生産が可能である方法として、鉄と銅の置換反応を利用した置換めっき法がある（例えば、特許文献１参照）。
これは銅がイオン状態で存在する硫酸銅水溶液中で黒鉛粉末と鉄粉を混合攪拌することにより、鉄と銅の置換反応で黒鉛粉末表面に銅を析出させて被覆するものであるが、析出する銅は微小粒子であり、これが次々に析出して黒鉛粉末表面を覆うので、出来上がった銅被覆粉末の表面はめっき前の黒鉛表面に比べて微小突起が多くなり、比表面積が増大する。
そのため、粉末粒子同志の接触点が多くなり、流動性も悪く、見掛密度及びタップ密度も低くなるという問題があった。このようなことから従来では、見掛密度は０．７５ｇ／ｃｍ３未満、タップ密度１．１ｇ／ｃｍ３未満であり、高密度の銅被覆黒鉛粉末が得られていなかった。
そして、この銅被覆黒鉛粉末をマトリックス成分粉末と混合する場合、両者の見掛密度の差が大きいほど分散性が悪く、銅被覆黒鉛粉末の偏析が生じ易くなるという問題があった。
This is intended to deposit and coat copper on the graphite powder surface by a substitution reaction of iron and copper by mixing and stirring graphite powder and iron powder in an aqueous copper sulfate solution in which copper is present in an ionic state. The copper to be produced is fine particles, which are deposited one after another to cover the surface of the graphite powder, so that the surface of the finished copper-coated powder has more fine protrusions and a specific surface area than the graphite surface before plating.
Therefore, there are problems that the contact points between the powder particles are increased, the fluidity is poor, and the apparent density and the tap density are lowered. Therefore, conventionally, the apparent density is less than 0.75 g / cm 3 and the tap density is less than 1.1 g / cm 3 , and a high-density copper-coated graphite powder has not been obtained.
When this copper-coated graphite powder is mixed with the matrix component powder, there is a problem that the greater the difference between the apparent densities of the two, the worse the dispersibility and the easier the segregation of the copper-coated graphite powder occurs.
本発明は、低見掛密度である鱗片状黒鉛等に銅めっきした銅黒鉛粉末において、めっき条件を最適化することにより、見掛密度及びタップ密度を向上させた銅被覆黒鉛粉末を得、マトリックス成分粉末との混合における分散性を向上させて、焼結後に安定した強度を持った焼結部品を製造できる粉末冶金用複合金属粉末を得ることを課題とする。 The present invention provides a copper-coated graphite powder having an improved apparent density and tap density by optimizing plating conditions in a copper graphite powder copper-plated on flaky graphite or the like having a low apparent density, and a matrix It is an object of the present invention to obtain a composite metal powder for powder metallurgy capable of improving the dispersibility in mixing with component powders and producing a sintered part having a stable strength after sintering.
本発明者らは、上記問題点を解決するために、原料粉末及び被覆に使用するめっき液の条件を種々検討した結果、ニカワの添加が著しい見掛密度及びタップ密度を改善できるとの知見を得た。
本発明はこの知見に基づいて、
（１）見掛密度：０．７５〜０．９５ｇ／ｃｍ３、タップ密度：１．１〜１．３ｇ／ｃｍ３であることを特徴とする銅被覆黒鉛粉末
（２）黒鉛に銅が１０〜８０重量％被覆されていることを特徴とする上記１記載の銅被覆黒鉛粉末
（３）黒鉛に銅が５０〜７０重量％被覆されていることを特徴とする上記１記載の銅被覆黒鉛粉末
（４）黒鉛に銅を被覆するに際して、置換めっき液にニカワを０．３〜５．０ｇ／Ｌ添加して置換めっきすることを特徴とする銅被覆黒鉛粉末の製造方法
（５）硫酸銅水溶液中に黒鉛粉末と鉄粉を混合攪拌して置換めっきすることを特徴とする上記４記載の銅被覆黒鉛粉末の製造方法
（６）硫酸銅水溶液中に黒鉛粉末、鉄粉及びニカワ０．３〜５．０ｇ／Ｌを添加し、これを攪拌して黒鉛粉末に銅を置換めっきすることを特徴とする上記１〜３のいずれかに記載の銅被覆黒鉛粉末の製造方法
を提供するものである。
In order to solve the above problems, the present inventors have made various findings on the conditions of the plating solution used for the raw material powder and coating, and as a result, found that the addition of glue can significantly improve the apparent density and tap density. Obtained.
The present invention is based on this finding,
(1) Apparent density: 0.75 to 0.95 g / cm 3 , tap density: 1.1 to 1.3 g / cm 3 , copper-coated graphite powder (2) 10% copper in graphite The copper-coated graphite powder according to 1 above, wherein the copper-coated graphite powder according to 1 is coated with 50 to 70% by weight of copper. (4) A method for producing a copper-coated graphite powder, wherein 0.3-5.0 g / L of nickel is added to a displacement plating solution when copper is coated on graphite. (5) A copper sulfate aqueous solution 4. The method for producing a copper-coated graphite powder according to 4 above, wherein the graphite powder and the iron powder are mixed and stirred to perform displacement plating. (6) The graphite powder, the iron powder, and the glue 0.3 to 0.3 in the aqueous copper sulfate solution. Add 5.0 g / L and stir this to replace the graphite powder with copper. It is intended to provide a method for producing a copper-coated graphite powder according to any one of the above 1 to 3, wherein.
上記に示す通り、低見掛密度である鱗片状黒鉛等に銅めっきする際に、置換めっき浴にニカワを添加することにより、見掛密度及びタップ密度を大きく向上させた銅被覆黒鉛粉末を得ることができるという優れた効果を有する。これによって、マトリックス成分粉末との混合における分散性を向上させ、焼結後に安定した強度を持った焼結部品を製造できる粉末冶金用複合金属粉末を得ることができる著しい効果がある。 As shown above, when copper is plated on flaky graphite having a low apparent density, a copper-coated graphite powder having a substantially improved apparent density and tap density is obtained by adding glue to the displacement plating bath. It has an excellent effect of being able to. As a result, there is a remarkable effect that the dispersibility in mixing with the matrix component powder is improved, and a composite metal powder for powder metallurgy capable of producing a sintered part having stable strength after sintering can be obtained.
本発明の銅被覆黒鉛粉末は、硫酸銅水溶液中に黒鉛粉末、鉄粉及びニカワを０．３〜５．０ｇ／Ｌ添加し、これを攪拌して黒鉛粉末に銅を置換めっきすることにより製造することができる。これによって、見掛密度及びタップ密度が著しく向上し、それぞれ０．７５〜０．９５ｇ／ｃｍ３及び１．１〜１．３ｇ／ｃｍ３である銅被覆黒鉛粉末を得ることができる。
めっき液としては、Ｃｕ２＋濃度：４０〜９０ｇ／Ｌ、好ましくは８０〜９０ｇ／Ｌ、硫酸（Ｈ２ＳＯ４）：５〜５０ｇ／Ｌ、好ましくは１０〜３０ｇ／Ｌ、液温：２０〜５０°Ｃ、好ましくは３０〜４０°Ｃの硫酸銅めっき浴を使用することができる。
めっき液のＣｕ濃度は高ければ高いほど、反応バッチ当たりの製造量を多くできるのでなるべく高い方が望ましい。しかし、液温に対して溶解度があるので、前記液温の条件に合う範囲で濃度４０〜９０ｇ／Ｌ、特により高い濃度８０〜９０ｇ／Ｌが適する。
The copper-coated graphite powder of the present invention is produced by adding 0.3 to 5.0 g / L of graphite powder, iron powder, and glue into an aqueous copper sulfate solution, stirring the resultant, and subjecting the graphite powder to copper plating. can do. As a result, the apparent density and the tap density are remarkably improved, and copper-coated graphite powders of 0.75 to 0.95 g / cm 3 and 1.1 to 1.3 g / cm 3 can be obtained.
As a plating solution, Cu 2+ concentration: 40 to 90 g / L, preferably 80 to 90 g / L, sulfuric acid (H 2 SO 4 ): 5 to 50 g / L, preferably 10 to 30 g / L, liquid temperature: 20 to A copper sulfate plating bath at 50 ° C, preferably 30-40 ° C can be used.
The higher the Cu concentration of the plating solution, the higher the production amount per reaction batch. However, since there is solubility with respect to the liquid temperature, a concentration of 40 to 90 g / L, particularly a higher concentration of 80 to 90 g / L is suitable as long as the liquid temperature is met.
硫酸濃度は、めっきの速度や生成する銅被膜の形状に影響する。硫酸が高いと反応が速くなるため、銅被膜が不規則になり、分散性を向上させるために添加するニカワの効果を妨げるという問題がある。また硫酸濃度が低すぎると反応速度が遅くなり、未反応の鉄粉が残留する。したがって、５〜５０ｇ／Ｌ、特に１０〜３０ｇ／Ｌが適する。
ここで言う液温は、投入するめっき液の温度を意味する。置換反応の進行により液温は上昇するので、反応中にこの温度に保持するという意味ではない。めっき液温が高いと急激に反応が起こり、ガス発生により突沸し反応槽から溢れ出す危険があるため、また硫酸銅の溶解度も考慮し、液温２０〜５０°Ｃ、特に３０〜４０°Ｃが適する。液温が低い場合には、硫酸銅の結晶が析出してしまうため、銅濃度を低くしなければならならず、生産性が低下する。
The sulfuric acid concentration affects the speed of plating and the shape of the resulting copper film. When sulfuric acid is high, there is a problem that the reaction becomes fast, the copper coating becomes irregular, and the effect of glue added to improve dispersibility is hindered. On the other hand, if the sulfuric acid concentration is too low, the reaction rate becomes slow and unreacted iron powder remains. Therefore, 5 to 50 g / L, particularly 10 to 30 g / L is suitable.
The solution temperature here means the temperature of the plating solution to be added. Since the liquid temperature rises as the substitution reaction proceeds, it does not mean that the temperature is maintained during the reaction. If the temperature of the plating solution is high, the reaction will occur rapidly, and there is a danger of bumping due to gas generation and overflowing from the reaction tank. Also, considering the solubility of copper sulfate, the solution temperature is 20-50 ° C, especially 30-40 ° C. Is suitable. When the liquid temperature is low, copper sulfate crystals are precipitated, so the copper concentration must be lowered, and productivity is lowered.
上記によって、従来の銅被覆黒鉛粉末では得るがことできなかった見掛密度及びタップ密度を達成することができる。すなわち、所定量のニカワを添加した場合は、ニカワを添加しない場合に比べて、本発明においては見掛密度が１．２〜１．４倍の銅被覆黒鉛粉末が得られた。
これらの物性値の向上により、見掛密度がより大きい青銅粉と混合したときの分散性が良くなり、焼結したときの製品特性の均一性が向上する。
見掛密度が０．７５ｇ／ｃｍ３未満では分散性の向上が十分ではない。
By the above, the apparent density and tap density which could not be obtained with the conventional copper-coated graphite powder can be achieved. That is, when a predetermined amount of glue was added, a copper-coated graphite powder having an apparent density of 1.2 to 1.4 times was obtained in the present invention as compared with the case where no glue was added.
By improving these physical property values, dispersibility when mixed with bronze powder having a higher apparent density is improved, and uniformity of product characteristics when sintered is improved.
When the apparent density is less than 0.75 g / cm 3 , the dispersibility is not sufficiently improved.
ニカワの添加量は重要であり、０．３ｇ／Ｌ未満では見掛密度及びタップ密度の向上が十分でない。また、添加量が５．０ｇ／Ｌを超えると、銅の色合いが黒ずんできて、製品としては好ましくない。さらに多量に例えば１０．０ｇ／Ｌ添加すると、粘性が大きくなりめっきができないという問題が発生する。したがって、ニカワの添加量を０．３〜５．０ｇ／Ｌとする。
銅は黒鉛に１０〜８０重量％被覆する。これによってマトリックス粉末との混合における分散性が向上した銅被覆黒鉛粉末を得ることができる。特に、黒鉛に銅が５０〜７０重量％被覆されていることが望ましい。
The amount of glue added is important, and if it is less than 0.3 g / L, the apparent density and tap density are not sufficiently improved. Moreover, when the addition amount exceeds 5.0 g / L, the tint of copper is darkened, which is not preferable as a product. Further, for example, when 10.0 g / L is added in a large amount, the problem that the viscosity increases and plating cannot be performed occurs. Therefore, the amount of glue added is set to 0.3 to 5.0 g / L.
Copper coats graphite by 10 to 80% by weight. As a result, a copper-coated graphite powder having improved dispersibility in mixing with the matrix powder can be obtained. In particular, it is desirable that the graphite is coated with 50 to 70% by weight of copper.
次に、本発明の実施例について説明する。なお、本実施例はあくまで１例であり、この例に制限されるものではない。すなわち、本発明の技術思想の範囲内で、実施例以外の態様あるいは変形を全て包含するものである。 Next, examples of the present invention will be described. In addition, a present Example is an example to the last, and is not restrict | limited to this example. That is, all aspects or modifications other than the embodiments are included within the scope of the technical idea of the present invention.
（実施例１〜５）
平均粒径４０μｍの鱗片状黒鉛粉末を原料として、６５重量％の銅をめっきした銅被覆黒鉛粉末を製造した。めっき浴組成は次の通りである。
・Ｃｕ２＋：８５ｇ／Ｌ
・硫酸（Ｈ２ＳＯ４）：１０ｇ／Ｌ
・液温：３５°Ｃ
・ニカワ添加量：表１に示す添加量（実施例１〜５について０．５〜５．０ｇ／Ｌの範囲で添加）
・置換用鉄粉：還元鉄粉（−１００ｍｅｓｈ）
得られた銅被覆黒鉛粉末の見掛密度（ＡＤ）、見掛密度の上昇倍率、タップ密度（ＴＤ）、タップ密度上昇倍率、分散性比較等を行った。この結果を同様に表１に示す。
分散性の比較に際しては、見掛密度が５ｇ／ｃｍ３である球状のアトマイズ青銅粉を、重量比で１：９の割合に混合し、分散性（銅被覆黒鉛の偏析の有無）を観察した。銅被覆黒鉛は赤色、アトマイズ青銅粉は黄色になるのでその差異は明瞭である。特に一旦ミキサーで混合したものを、別な容器に移し替える際に、偏析がある場合は筋状に分離して観察されるので肉眼でも容易に判別できる。
(Examples 1-5)
Using a scaly graphite powder having an average particle size of 40 μm as a raw material, a copper-coated graphite powder plated with 65% by weight of copper was produced. The plating bath composition is as follows.
Cu 2+ : 85 g / L
・ Sulfuric acid (H 2 SO 4 ): 10 g / L
・ Liquid temperature: 35 ° C
Additive amount of glue: addition amount shown in Table 1 (addition in the range of 0.5 to 5.0 g / L for Examples 1 to 5)
-Replacement iron powder: Reduced iron powder (-100 mesh)
The resulting copper-coated graphite powder was subjected to apparent density (AD), apparent density increase ratio, tap density (TD), tap density increase ratio, dispersibility comparison, and the like. The results are also shown in Table 1.
When comparing the dispersibility, spherical atomized bronze powder having an apparent density of 5 g / cm 3 was mixed at a weight ratio of 1: 9, and the dispersibility (presence / absence of segregation of copper-coated graphite) was observed. . Since the copper-coated graphite is red and the atomized bronze powder is yellow, the difference is clear. In particular, when the mixture once mixed with the mixer is transferred to another container, if there is segregation, it can be easily discriminated with the naked eye because it is observed in the form of streaks.
と
表１の実施例１〜５に示すように、ニカワを０．５〜５．０ｇ／Ｌ添加したものについては、見掛密度が０．７８〜０．９５ｇ／ｃｍ３となり、またタップ密度も１．１９〜１．２８ｇ／ｃｍ３となり、ニカワの添加量の増加と共に、上昇した。また、上記分散性については、偏析がなく、いずれも良好である結果が得られた。
なお、実施例（表１）には示していないが、さらにニカワ添加量を増やした場合（ニカワ添加量５．０ｇ／Ｌを超えた場合）、すなわちニカワの添加量が多すぎると、銅被覆黒鉛粉の色が鮮明な赤色から黒ずみ、好ましくない結果が得られた。
As shown in Examples 1 to 5 in Table 1, the apparent density of 0.78 to 0.95 g / cm 3 for tapers added with 0.5 to 5.0 g / L of glue, and the tap density Was 1.19 to 1.28 g / cm 3 , and increased with an increase in the amount of glue added. Moreover, about the said dispersibility, there was no segregation and the result with which all were favorable was obtained.
Although not shown in the examples (Table 1), when the amount of glue added is further increased (when the amount of glue added exceeds 5.0 g / L), that is, when the amount of glue added is too large, the copper coating The graphite powder was dark red to dark, and an undesirable result was obtained.
（比較例１）
実施例と同様の平均粒径４０μｍの鱗片状黒鉛粉末を原料として、６５重量％の銅をめっきした銅被覆黒鉛粉末を製造した。めっき浴組成は次の通りである。
・Ｃｕ２＋：８５ｇ／Ｌ
・硫酸（Ｈ２ＳＯ４）：３０ｇ／Ｌ
・液温：３５°Ｃ
・ニカワ添加せず。
・置換用鉄粉：還元鉄粉（−１００ｍｅｓｈ）
得られた銅被覆黒鉛粉末の見掛密度（ＡＤ）、見掛密度の上昇倍率、タップ密度（ＴＤ）、タップ密度上昇倍率、分散性比較等を行った。この結果を同様に表１に示す。分散性（偏析の有無）の比較に際しては、実施例と同様に、見掛密度が５ｇ／ｃｍ３である球状のアトマイズ青銅粉を、重量比で１：９の割合に混合し、分散性（銅被覆黒鉛の偏析の有無）を観察した。
(Comparative Example 1)
A copper-coated graphite powder plated with 65% by weight of copper was produced using a flaky graphite powder having an average particle diameter of 40 μm as in the examples as a raw material. The plating bath composition is as follows.
Cu 2+ : 85 g / L
・ Sulfuric acid (H 2 SO 4 ): 30 g / L
・ Liquid temperature: 35 ° C
・ Nika was not added.
-Replacement iron powder: Reduced iron powder (-100 mesh)
The resulting copper-coated graphite powder was subjected to apparent density (AD), apparent density increase ratio, tap density (TD), tap density increase ratio, dispersibility comparison, and the like. The results are also shown in Table 1. In the comparison of dispersibility (presence / absence of segregation), spherical atomized bronze powder having an apparent density of 5 g / cm 3 was mixed at a weight ratio of 1: 9 in the same manner as in the Examples. The presence or absence of segregation of the copper-coated graphite was observed.
以上の結果、ニカワ無添加の場合、見掛密度は０．６６ｇ／ｃｍ３、タップ密度０．９５ｇ／ｃｍ３となり、いずれも低い値となった。
一旦、比較例１の銅被覆黒鉛粉末とアトマイズ青銅粉とをミキサーで十分に混合したものを、別な容器に移し替えた際に、赤と黄色の筋状が分離して観察された。これは、比較例の銅被覆黒鉛粉末とアトマイズ青銅粉が偏析を起こしている証拠であり、分散性が悪く偏析があることが分かった。
As a result, when no glue was added, the apparent density was 0.66 g / cm 3 and the tap density was 0.95 g / cm 3 , both of which were low values.
Once the copper-coated graphite powder of Comparative Example 1 and the atomized bronze powder were sufficiently mixed with a mixer, when transferred to another container, red and yellow streaks were observed separately. This is evidence that the copper-coated graphite powder of the comparative example and the atomized bronze powder are segregated, and it was found that the dispersibility was poor and segregation occurred.
（比較例２）
実施例と同様の平均粒径４０μｍの鱗片状黒鉛粉末を原料として、６５重量％の銅をめっきした銅被覆黒鉛粉末を製造した。めっき浴組成は次の通りである。
・Ｃｕ２＋：８５ｇ／Ｌ
・硫酸（Ｈ２ＳＯ４）：１０ｇ／Ｌ
・液温：３５°Ｃ
・ニカワ添加：０．１ｇ／Ｌ
・置換用鉄粉：還元鉄粉（−１００ｍｅｓｈ）
得られた銅被覆黒鉛粉末の見掛密度（ＡＤ）、見掛密度の上昇倍率、タップ密度（ＴＤ）、タップ密度上昇倍率、分散性比較等を行った。この結果を同様に表１に示す。
分散性（偏析の有無）の比較に際しては、実施例と同様に、見掛密度が５ｇ／ｃｍ３である球状のアトマイズ青銅粉を、重量比で１：９の割合に混合し、分散性（銅被覆黒鉛の偏析の有無）を観察した。
(Comparative Example 2)
A copper-coated graphite powder plated with 65% by weight of copper was produced using a flaky graphite powder having an average particle diameter of 40 μm as in the examples as a raw material. The plating bath composition is as follows.
Cu 2+ : 85 g / L
・ Sulfuric acid (H 2 SO 4 ): 10 g / L
・ Liquid temperature: 35 ° C
・ Addition of glue: 0.1 g / L
-Replacement iron powder: Reduced iron powder (-100 mesh)
The resulting copper-coated graphite powder was subjected to apparent density (AD), apparent density increase ratio, tap density (TD), tap density increase ratio, dispersibility comparison, and the like. The results are also shown in Table 1.
In the comparison of dispersibility (presence / absence of segregation), spherical atomized bronze powder having an apparent density of 5 g / cm 3 was mixed at a weight ratio of 1: 9 in the same manner as in the Examples. The presence or absence of segregation of the copper-coated graphite was observed.
以上の結果、ニカワ０．１ｇ／Ｌ添加の場合、見掛密度は０．７２ｇ／ｃｍ３、タップ密度１．１１ｇ／ｃｍ３となり、無添加に比べやや改善されたが、いずれも低い値となった。
さらに、一旦比較例２の銅被覆黒鉛粉末とアトマイズ青銅粉とをミキサーで十分に混合したものを、別な容器に移し替えた際に、比較例１と同様に、若干ではあるが赤と黄色の筋状が分離して観察された。これは、比較例２の銅被覆黒鉛粉末とアトマイズ青銅粉が偏析を起こしている証拠であり、分散性がやや悪く偏析があることが分かった。
As a result, when the glue was added at 0.1 g / L, the apparent density was 0.72 g / cm 3 and the tap density was 1.11 g / cm 3 . became.
Furthermore, once the copper-coated graphite powder of Comparative Example 2 and the atomized bronze powder that were sufficiently mixed with a mixer were transferred to another container, similar to Comparative Example 1, although slightly, red and yellow The streaks were separated and observed. This is evidence that the copper-coated graphite powder and the atomized bronze powder of Comparative Example 2 are segregated, and it was found that the dispersibility was somewhat poor and segregation occurred.
低見掛密度である鱗片状黒鉛等に銅めっきする際に、置換めっき浴にニカワを添加することにより、見掛密度及びタップ密度を大きく向上させた銅被覆黒鉛粉末を得ることができるという優れた効果を有する。
これによって、マトリックス成分粉末との混合における分散性を向上させ、焼結後に安定した強度を持せることができるので、焼結部品の製造に最適である。
When copper plating is applied to flaky graphite with a low apparent density, it is possible to obtain a copper-coated graphite powder with greatly improved apparent density and tap density by adding glue to the displacement plating bath. It has the effect.
Thereby, the dispersibility in mixing with the matrix component powder can be improved and a stable strength can be obtained after sintering, which is optimal for the production of sintered parts.
Claims (6)
The graphite powder, iron powder, and nickel powder of 0.3 to 5.0 g / L are added to the copper sulfate aqueous solution, and the resulting mixture is stirred and copper is substituted and plated on the graphite powder. A method for producing the copper-coated graphite powder according to claim 1.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104368816A (en) * | 2013-08-14 | 2015-02-25 | 东睦新材料集团股份有限公司 | Method for manufacturing iron-based powder metallurgy components |
| EP2878839A1 (en) | 2012-07-26 | 2015-06-03 | NTN Corporation | Sintered bearing |
| JP2017161072A (en) * | 2017-03-17 | 2017-09-14 | Ntn株式会社 | Sintered bearing |
| CN111705231A (en) * | 2020-07-03 | 2020-09-25 | 毛金昌 | Nickel-based copper-clad graphite self-lubricating composite material and sintering method thereof |
| CN112828282A (en) * | 2020-12-30 | 2021-05-25 | 有研粉末新材料(合肥)有限公司 | Preparation and treatment method of copper-clad graphite composite powder |
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