JP3670598B2 - Molybdenum disulfide projection material - Google Patents
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- JP3670598B2 JP3670598B2 JP2001146892A JP2001146892A JP3670598B2 JP 3670598 B2 JP3670598 B2 JP 3670598B2 JP 2001146892 A JP2001146892 A JP 2001146892A JP 2001146892 A JP2001146892 A JP 2001146892A JP 3670598 B2 JP3670598 B2 JP 3670598B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、二硫化モリブデンを含有してなる投射用材料であって、物質表面に投射することによって当該物質表面の改質を図ることができる二硫化モリブデン投射用材料に関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】
二硫化モリブデン（ＭｏＳ2）は、天然の鉱物であり、黒鉛に似た銀灰色の柔らかな金属粉末であり、低摩擦性、耐熱性及び耐荷重性に特に優れた性質を有している上、荷重が増加すると摩擦係数が低くなり、しかも荷重、温度、速度が変化してもほぼ一定の摩擦係数を保つ特質も有しているため、従来から、固体潤滑剤や摺動面の形成・改質材等として用いられてきた。
【０００３】
例えば、スパッタリング、蒸着やイオンプレーティングなどによって摺動面に対し二硫化モリブデンの被膜を形成したり、有機もしくは無機のバインダーと混ぜてスプレーコーティングした後、乾燥もしくは焼付硬化させて摺動性の優れた乾性潤滑膜を形成する方法などが行なわれてきた。例えば、特開平８−１９６９５１号は、二硫化モリブデン粉末と合成樹脂との混合粉末を高圧ガスと共に加工物表面に噴射することにより、加工物表面に固体潤滑皮膜を形成し、当該加工物表面の摩擦性を高める方法を開示している。
【０００４】
しかし、前者の方法は、処理設備のコストが高く、生産性にも劣る上、皮膜の均一性を保つのが難しいという問題が指摘されていた。また、後者の方法については、固体潤滑剤粉末と合成樹脂との比重差や粒径の違いにより、固体潤滑剤粉末の投射を均一にすることが難しいという課題を指摘されていた。
【０００５】
また、特許２８１８２２６号は、二硫化モリブデン粉末で表面を被覆した鋼球を基材表面に高速度で投射して、該表面に固体潤滑皮膜を形成する方法を開示しているが、わざわざ鋼球表面に二硫化モリブデン粉末を被覆させる必要があり、経済的な方法とは言えなかった。
【０００６】
本発明は、二硫化モリブデンを含有する投射用材料について鋭意研究を進め、物質表面の改質、中でも特に物質表面の摩擦係数を低下せしめることができ、しかもその耐久性に優れた二硫化モリブデン投射用材料を提供せんとするものである。
【０００７】
【課題を解決するための手段】
かかる課題解決のため、本発明は、ほぼ二硫化モリブデンのみからなり、しかもその二硫化モリブデンの粒度を大きな範囲に限定することとした。具体的には、電気抵抗法により測定して得た平均粒子径が、約１μｍ〜約２０μｍ、好ましくは約１０μｍ〜約２０μｍの二硫化モリブデンを約９５重量％以上含有してなる二硫化モリブデン投射用材料を提供することとした。
【０００８】
このように、ほぼ二硫化モリブデンのみからなり、しかもその二硫化モリブデンの粒度を平均粒子径約１μｍ〜約２０μｍの範囲に限定した二硫化モリブデン投射用材料であれば、例えば風圧等によって物質表面（加工表面）に投射することにより、当該物質表面を好適かつ安価に改質することができる。中でも、物質表面の摩擦係数を有効に低下させることができ、しかもその低下効果を長く確保することができる。例えば自動車エンジンのピストン表面に投射することにより、当該ピストンの表面摩擦係数を有効に低下させることができ、自動車の燃費を有効に向上させることができる。更に、本発明の二硫化モリブデン投射用材料は、ほぼ二硫化モリブデンのみからなるものであり、しかも投射する際の運動エネルギーのみによって物質表面の改質を図ることができるから、有機溶剤を必要とせず、それでいて当該物質表面を均質に仕上がることができる。また、二硫化モリブデン以外の成分をほとんど含まないために、合成樹脂などとの相性関係なく広い範囲の物質表面に適用可能であり、例えば金属以外でも、樹脂、ガラス、セラミックスからなる表面の改質に好適に用いることができる。
【０００９】
本発明の二硫化モリブデン投射用材料を用いると、なぜこのように摩擦係数が低下し、しかもその耐久性を高く保持できるかについては未だそのメカニズムが完全に解明できているわけではないが、本発明の二硫化モリブデン投射用材料を物質表面に高速で投射すると、加速された二硫化モリブデン粒子が物質表面に吹き付けられて衝突し、その衝突エネルギーで物質表面に付着する。ここで、従来の皮膜形成とは異なり、この表面皮膜が剥げても効果が持続することから、本発明の場合には、衝突の際に二硫化モリブデン粉末が物質表面に打ち込まれた状態、すなわち二硫化モリブデンが物質表面層内に侵入して新たな改質表面層を形成するものと推定することができ、しかもその新たな改質表面層は、二硫化モリブデンの純度を高めたことによって、より一層密着性が高く下地材との付着力の強固な改質表面層が形成されるものと推定することができる。
【００１０】
【発明の実施の形態】
以下、より詳しく本発明の二硫化モリブデン投射用材料について説明する。
【００１１】
本発明の投射用材料は、平均粒子径約１μｍ〜２０μｍ、好ましくは１０μｍ〜２０μｍの二硫化モリブデン（ＭｏＳ2）を、約９５重量％以上、好ましく約９８重量％以上の割合で含有するものである。平均粒子径が約１μｍを下回ると、物質表面に対して高速投射しても表面摩擦係数を有効に低下させることが難しくなる。
【００１２】
二硫化モリブデン（ＭｏＳ2）の粒子径について更に言えば、１０μｍ以上の粒子を５０重量％以上含有させるのが好ましく、中でも更に５μｍ以下の粒子を２０重量％以下に抑えるのが特に好ましい。
【００１３】
なお、本発明の二硫化モリブデン（ＭｏＳ2）の粒子径は、各二硫化モリブデン（ＭｏＳ2）粒子の容積から同容積の球を想定し、この球の径を粒子径として換算したものである。すなわち、粒子の個数と体積を計測し、これに基づいて各粒子を球形と仮定して計算することができ、実際に本発明者らは、電気抵抗法による測定機器（コールターカウンター・マルチタイザーIII型、ベックマン・コールター社製（アパチャーチューブ１００μｍ））を用いて粒子の個数と体積を実測し粒径を測定している。
粒子径の調整は、分級機の設定値（分級粒子径）を変更することにより所望の平均粒子径範囲に調整することができる。
また、平均粒子径とは、ある処理に用いる二硫化モリブデン投射用材料に含まれる二硫化モリブデン粒子の粒子径の平均値を意味している。
【００１４】
本発明において二硫化モリブデン（ＭｏＳ2）の純度を約９５重量％以上、好ましくは約９８重量％以上に限定した意味は、天然物として入手した二硫化モリブデン（ＭｏＳ2）のみから二硫化モリブデン投射用材料を構成するという意味である。すなわち、天然物として入手可能な二硫化モリブデン（ＭｏＳ2）の純度は約９５重量％〜約９９重量％であり、天然物として入手した二硫化モリブデン（ＭｏＳ2）以外の物質を故意に加えないという意である。
【００１５】
本発明の二硫化モリブデン投射用材料は、投射速度１００ｍ／Ｓ以上の投射に用いるのが好ましい。これは、投射速度１００ｍ／Ｓよりも著しく遅い速度の投射では、二硫化モリブデン粒子を十分に加速することができず、物質表面への打ち込み効果が不足する可能性があるためである。
なお、現在、投射速度１００ｍ／Ｓの投射よりも、投射速度２００ｍ／Ｓの投射の方がより一層優れた摩擦係数低下効果を得られることが確かめられている。
【００１６】
投射方法としては、物質表面に高速で投射材を噴射することができる現在公知のあらゆる方法を採用できる。例えば、風圧で物質表面に投射材を投射する方法、具体的には、噴射ガンなどを用いて、圧縮空気や圧縮ハロゲンガスとともに二硫化モリブデン粉末をノズルから物質表面に噴射する方法などを採用することができ、この際の噴射装置には、例えば市販のショットピーニング機またはサンドブラスト機なども使用することができる。
なお、本発明の二硫化モリブデン投射用材料の投射に当たっては、物質表面に衝突して付着しなかった投射用材料を回収し、繰り返し物質表面に投射するようにするのが好ましい。理論的には、全ての二硫化モリブデン粒子が１μｍを下回るまで有効に使用することができ、しかも物質表面への投射総量を増やすことにより投射材の打ち込み効果をより一層高まることが期待できる。
【００１７】
本発明の二硫化モリブデン投射用材料は、上述のように各種の物質表面への改質用途に用いることができるが、中でも金属、樹脂、ガラス、セラミックスのいずれかからなる物質表面の改質、特に低摩擦化に有効に用いることができ、金属、中でもアルミニウム合金や鉄などからなる物質表面への投射材としては極めて優れた効果を発揮する。具体的に言えば、各種機械の軸や軸受部、内燃機関中のピストン、シャフト、コンロット、ピストンリング、シリンダボアなどの摩擦抵抗が低く安定した摺動を要求される部分の改質に特に好ましく用いることができる。
【００１８】
（実施例）
以下、本発明の一実施例としての二硫化モリブデン投射用材料について説明する。
【００１９】
本例の二硫化モリブデン粉末の成分組成を測定した結果、二硫化モリブデン９９．６８重量％、鉄及び鉄化合物０．１６重量％、アルミニウム及びアルミニウム化合物０．０６重量％、ナトリウム及びナトリウム化合物０．０２重量％、カルシウム及びカルシウム化合物０．０２重量％、鉛及び鉛化合物０．０６重量％を含有していた。
【００２０】
上記組成の二硫化モリブデン粉末を分級機を用いて分級し、１０μｍ〜２０μｍの二硫化モリブデン粉末を５０重量％以上含有し、５μｍ以下の二硫化モリブデン粉末を２０重量％以下含有し、残りが５μｍ〜１０μｍの二硫化モリブデン粉末である二硫化モリブデン投射用材料を調整した。
なお、この際の粒度測定は、コールターカウンター・マルチタイザーIII型（ベックマン・コールター社製（アパチャーチューブ１００μｍ））を用いた。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projection material containing molybdenum disulfide, and relates to a molybdenum disulfide projection material capable of improving the surface of a substance by projecting the substance surface.
[0002]
[Prior art and problems to be solved by the invention]
Molybdenum disulfide (MoS 2 ) is a natural mineral, a silver-gray soft metal powder similar to graphite, and has particularly excellent properties such as low friction, heat resistance and load resistance. As the load increases, the coefficient of friction decreases, and it also has the property of maintaining a constant coefficient of friction even when the load, temperature, and speed change. It has been used as a quality material.
[0003]
For example, a film of molybdenum disulfide is formed on the sliding surface by sputtering, vapor deposition, ion plating, etc., or spray coated by mixing with an organic or inorganic binder, then dried or baked and cured to provide excellent sliding properties A method for forming a dry lubricating film has been performed. For example, Japanese Patent Laid-Open No. 8-196951 forms a solid lubricating film on the surface of a workpiece by injecting a mixed powder of molybdenum disulfide powder and a synthetic resin together with a high-pressure gas onto the surface of the workpiece. A method for enhancing friction is disclosed.
[0004]
However, the former method has been pointed out that the cost of the processing equipment is high, the productivity is inferior, and the uniformity of the film is difficult to maintain. Further, the latter method has been pointed out that it is difficult to make the projection of the solid lubricant powder uniform due to the difference in specific gravity and particle size between the solid lubricant powder and the synthetic resin.
[0005]
Japanese Patent No. 2818226 discloses a method of projecting a steel ball whose surface is coated with molybdenum disulfide powder onto a substrate surface at a high speed to form a solid lubricating film on the surface. It was necessary to coat the surface with molybdenum disulfide powder, which was not an economical method.
[0006]
The present invention has been intensively studied on a projection material containing molybdenum disulfide, and can modify the surface of a substance, in particular, reduce the coefficient of friction of the substance surface, and it has excellent durability. It is intended to provide materials for use.
[0007]
[Means for Solving the Problems]
In order to solve such a problem, the present invention is substantially composed only of molybdenum disulfide, and the particle size of the molybdenum disulfide is limited to a large range. Specifically, a molybdenum disulfide projection comprising about 95% by weight or more of molybdenum disulfide having an average particle diameter measured by an electric resistance method of about 1 μm to about 20 μm , preferably about 10 μm to about 20 μm. It was decided to provide materials.
[0008]
In this way, if the material for molybdenum disulfide projection is made of only molybdenum disulfide and the particle size of the molybdenum disulfide is limited to an average particle size of about 1 μm to about 20 μm , the surface of the substance (for example, by wind pressure) By projecting onto the processed surface, the surface of the substance can be modified suitably and inexpensively. In particular, the friction coefficient of the material surface can be effectively reduced, and the reduction effect can be ensured for a long time. For example, by projecting onto the piston surface of an automobile engine, the surface friction coefficient of the piston can be effectively reduced, and the fuel efficiency of the automobile can be effectively improved. Furthermore, the molybdenum disulfide projecting material of the present invention consists essentially of molybdenum disulfide, and the surface of the substance can be modified only by the kinetic energy at the time of projection, so an organic solvent is not required. However, the surface of the material can be finished homogeneously. In addition, since it contains almost no components other than molybdenum disulfide, it is applicable to the surface of a wide range of materials without compatibility with synthetic resins. For example, surface modification made of resin, glass, or ceramics other than metal Can be suitably used.
[0009]
With the molybdenum disulfide projecting material of the present invention, the mechanism of friction is lowered and the durability can be kept high, but the mechanism has not yet been fully clarified. When the molybdenum disulfide projecting material of the invention is projected onto the material surface at high speed, the accelerated molybdenum disulfide particles are sprayed and collide with the material surface, and adhere to the material surface with the collision energy. Here, unlike the conventional film formation, the effect continues even if the surface film is peeled off, so in the case of the present invention, the state in which the molybdenum disulfide powder is driven into the material surface at the time of collision, that is, It can be presumed that molybdenum disulfide penetrates into the material surface layer to form a new modified surface layer, and the new modified surface layer has increased the purity of molybdenum disulfide, It can be estimated that a modified surface layer having higher adhesion and strong adhesion to the base material is formed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the molybdenum disulfide projecting material of the present invention will be described in more detail.
[0011]
The projection material of the present invention contains molybdenum disulfide (MoS 2 ) having an average particle diameter of about 1 μm to 20 μm, preferably 10 μm to 20 μm in a proportion of about 95% by weight or more, preferably about 98% by weight or more. is there. When the average particle size is less than about 1 μm, it is difficult to effectively reduce the surface friction coefficient even if the material surface is projected at high speed.
[0012]
In addition regards the particle size of molybdenum disulfide (MoS 2), preferably in a 10 [mu] m or more particles Ru is 50 wt% or more, particularly preferably suppressed among others further 5μm particles smaller than 20% by weight or less.
[0013]
In addition, the particle diameter of the molybdenum disulfide (MoS 2 ) of the present invention assumes a sphere of the same volume from the volume of each molybdenum disulfide (MoS 2 ) particle, and the diameter of this sphere is converted as the particle diameter. . That is, the number and volume of particles can be measured, and based on this, each particle can be calculated assuming a spherical shape. In fact, the present inventors have measured a measuring instrument (Coulter Counter Multitizer III using an electric resistance method). The number and volume of particles were measured using a mold, manufactured by Beckman Coulter (aperture tube 100 μm), and the particle size was measured.
The particle diameter can be adjusted to a desired average particle diameter range by changing the set value (classified particle diameter) of the classifier.
The average particle diameter means the average value of the particle diameters of the molybdenum disulfide particles contained in the molybdenum disulfide projection material used for a certain treatment.
[0014]
In the present invention, the meaning of limiting the purity of molybdenum disulfide (MoS 2 ) to about 95% by weight or more, preferably about 98% by weight or more means that molybdenum disulfide projection is made only from molybdenum disulfide (MoS 2 ) obtained as a natural product. It means to make up the material. That is, the purity of molybdenum disulfide (MoS 2 ) available as a natural product is about 95 wt% to about 99 wt%, and no substances other than molybdenum disulfide (MoS 2 ) obtained as a natural product are intentionally added. It means that.
[0015]
The molybdenum disulfide projecting material of the present invention is preferably used for projecting at a projection speed of 100 m / S or higher. This is because when the projection speed is significantly slower than the projection speed of 100 m / S, the molybdenum disulfide particles cannot be sufficiently accelerated, and the effect of driving into the material surface may be insufficient.
Currently, it has been confirmed that the projection with a projection speed of 200 m / S can obtain a better friction coefficient reduction effect than the projection with a projection speed of 100 m / S.
[0016]
As the projection method, any currently known method capable of injecting the projection material onto the material surface at high speed can be adopted. For example, a method of projecting a projection material onto a material surface with wind pressure, specifically, a method of injecting molybdenum disulfide powder together with compressed air or compressed halogen gas from a nozzle onto the material surface using an injection gun or the like is adopted. For example, a commercially available shot peening machine or a sand blasting machine can also be used as the jetting apparatus at this time.
When projecting the molybdenum disulfide projecting material of the present invention, it is preferable to collect the projecting material that did not adhere to the substance surface and repeatedly project it onto the substance surface. Theoretically, all of the molybdenum disulfide particles can be used effectively until the particle diameter falls below 1 μm, and the projecting effect of the projection material can be further enhanced by increasing the total amount of projection onto the material surface.
[0017]
The material for projecting molybdenum disulfide according to the present invention can be used for modification to various substance surfaces as described above. Among them, modification of the substance surface made of any of metal, resin, glass, ceramics, In particular, it can be used effectively for reducing friction, and exhibits an extremely excellent effect as a projection material on the surface of a substance made of a metal, particularly an aluminum alloy or iron. Specifically, it is particularly preferably used for reforming parts that require stable sliding with low frictional resistance, such as shafts and bearings of various machines, pistons in internal combustion engines, shafts, conrots, piston rings, and cylinder bores. be able to.
[0018]
(Example)
Hereinafter, a molybdenum disulfide projecting material as an embodiment of the present invention will be described.
[0019]
As a result of measuring the component composition of the molybdenum disulfide powder of this example, 99.68% by weight of molybdenum disulfide, 0.16% by weight of iron and iron compound, 0.06% by weight of aluminum and aluminum compound, sodium and sodium compound 0. 02 wt%, calcium and calcium compound 0.02 wt%, lead and lead compound 0.06 wt%.
[0020]
Molybdenum disulfide powder having the above composition is classified using a classifier, containing 50 to 20% by weight of molybdenum disulfide powder of 10 μm to 20 μm, containing 20% by weight or less of molybdenum disulfide powder of 5 μm or less, and the remainder being 5 μm A material for projecting molybdenum disulfide, which is a 10 μm-molybdenum disulfide powder, was prepared.
In this case, the particle size was measured using a Coulter counter multitizer type III (manufactured by Beckman Coulter, Inc. (aperture tube 100 μm)).
Claims (4)
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| JP2001146892A JP3670598B2 (en) | 2001-05-16 | 2001-05-16 | Molybdenum disulfide projection material |
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| JP2001146892A JP3670598B2 (en) | 2001-05-16 | 2001-05-16 | Molybdenum disulfide projection material |
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| JP2002339083A JP2002339083A (en) | 2002-11-27 |
| JP3670598B2 true JP3670598B2 (en) | 2005-07-13 |
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|---|---|---|---|---|
| JP4844914B2 (en) * | 2003-12-08 | 2011-12-28 | 大東潤滑株式会社 | Formation method of lubrication layer by molybdenum disulfide. |
| JP4122305B2 (en) * | 2004-02-18 | 2008-07-23 | 大同メタル工業株式会社 | Slide bearing for internal combustion engine |
| EP1840395B1 (en) | 2005-01-18 | 2013-04-24 | NSK Ltd. | Rolling device |
| CN1928362A (en) * | 2005-09-08 | 2007-03-14 | 松下电器产业株式会社 | Refrigerant compressor, cooling system and refrigerator |
| JP4890839B2 (en) * | 2005-11-22 | 2012-03-07 | 大同メタル工業株式会社 | Multi-layer sliding member and method for forming coating layer of sliding member |
| JP4688161B2 (en) | 2006-03-30 | 2011-05-25 | 大同メタル工業株式会社 | Sliding member and coating layer forming method thereof |
| KR20090068326A (en) * | 2006-10-16 | 2009-06-26 | 파나소닉 주식회사 | Sliding face modification material, method for producing sliding face modification material, method for using sliding face modification material, sliding members having sliding face modification material, and compressor comprising sliding members |
| US8507414B2 (en) | 2008-04-14 | 2013-08-13 | Applied Diamond Inc. | Oil-in-water emulsion composition |
| AU2011225590B2 (en) | 2010-03-09 | 2014-11-20 | Taiho Kogyo Co., Ltd. | Sliding member |
| JP5680998B2 (en) * | 2011-03-07 | 2015-03-04 | 日本パーカライジング株式会社 | Method for forming lubricating film for plastic working |
| FR2999670B1 (en) * | 2012-12-13 | 2014-11-28 | Hydromecanique & Frottement | GUIDE ARRANGEMENT IN THE FORM OF A METAL RING FOR FITTING WITH FRICTION AND WITH ARTICULATING AND / OR SLIDING CAPACITY OF AXIS. |
| WO2014103974A1 (en) * | 2012-12-26 | 2014-07-03 | カルソニックカンセイ株式会社 | Gas compressor |
| JP5878157B2 (en) * | 2012-12-26 | 2016-03-08 | カルソニックカンセイ株式会社 | Gas compressor |
| JP2015083861A (en) * | 2013-10-25 | 2015-04-30 | 日本精工株式会社 | Cage for needle roller bearing and needle roller bearing |
| JP2019171512A (en) * | 2018-03-28 | 2019-10-10 | トヨタ自動車東日本株式会社 | Slide member and method for manufacture thereof |
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2001
- 2001-05-16 JP JP2001146892A patent/JP3670598B2/en not_active Expired - Lifetime
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