JP2002339083A - Molybdenum disulfide for projection - Google Patents
Molybdenum disulfide for projectionInfo
- Publication number
- JP2002339083A JP2002339083A JP2001146892A JP2001146892A JP2002339083A JP 2002339083 A JP2002339083 A JP 2002339083A JP 2001146892 A JP2001146892 A JP 2001146892A JP 2001146892 A JP2001146892 A JP 2001146892A JP 2002339083 A JP2002339083 A JP 2002339083A
- Authority
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- Japan
- Prior art keywords
- molybdenum disulfide
- projection
- projecting
- weight
- present
- 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.)
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- Lubricants (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
【０００１】[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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection material containing molybdenum disulfide, wherein the material surface can be modified by projecting it on the surface of the material. About.
【０００２】[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（通常、平均粒子径０．
４μｍ〜５．０μｍ）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。 2. Description of the Related Art Molybdenum disulfide (MoS 2 ) is a natural mineral, and is a soft silver-gray metal powder similar to graphite (usually having an average particle size of 0.1%).
4 μm to 5.0 μm), which has particularly low friction, heat resistance, and load resistance properties. In addition, the friction coefficient decreases as the load increases, and the load, temperature, and speed change. However, since it has the property of maintaining a substantially constant friction coefficient, it has been used as a solid lubricant or a material for forming or modifying a sliding surface.
【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８−１９６９５
１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。For example, a coating of molybdenum disulfide is formed on a sliding surface by sputtering, vapor deposition, ion plating, or the like, or mixed with an organic or inorganic binder, spray-coated, and then dried or baked to harden. A method of forming a dry lubricating film having excellent properties has been performed. For example, Japanese Patent Application Laid-Open No. 8-19695
No. 1 discloses a method in which a mixed powder of molybdenum disulfide powder and a synthetic resin is sprayed on the surface of a workpiece together with a high-pressure gas to form a solid lubricating film on the surface of the workpiece and increase the frictional property of the surface of the workpiece. Has been disclosed.
【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。However, it has been pointed out that the former method has high processing equipment costs, is inferior in productivity, and has difficulty in maintaining uniform film. In addition, in the latter method, it has been pointed out that it is difficult to make the projection of the solid lubricant powder uniform due to a difference in specific gravity and a difference in particle diameter between the solid lubricant powder and the synthetic resin.
【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。Japanese Patent No. 2818226 discloses a method of projecting a steel ball coated with molybdenum disulfide powder on the surface of a substrate at a high speed to form a solid lubricating film on the surface. It was necessary to coat the steel ball surface with molybdenum disulfide powder, which was not an economical method.
【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。[0006] The present invention has been studied diligently with respect to a projection material containing molybdenum disulfide, and is capable of modifying the surface of a material, in particular, reducing the friction coefficient of the material surface, and having excellent durability. It is intended to provide a material for projecting molybdenum sulfide.
【０００７】[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、平均粒子径約以上１μｍ、好ま
しくは約１０μｍ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。[Means for Solving the Problems] To solve such problems,
The present invention consists essentially of molybdenum disulfide only, and limits the particle size of the molybdenum disulfide to a large range. Specifically, a molybdenum disulfide projection material containing molybdenum disulfide having an average particle diameter of about 1 μm or more, preferably about 10 μm, in an amount of about 95% by weight or more is provided.
【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
径約以上１μｍの大きな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。[0008] As described above, if the material for projecting molybdenum disulfide is substantially composed of only molybdenum disulfide and the particle size of the molybdenum disulfide is limited to a large range having an average particle diameter of about 1 µm or more, the material may be subjected to, for example, wind pressure. By projecting on the surface (processed surface), the surface of the substance can be modified suitably and inexpensively. Above all, the coefficient of friction of the material surface can be effectively reduced, and the effect of the reduction 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. Further, the molybdenum disulfide projection material of the present invention is substantially composed of only molybdenum disulfide, and can modify the material surface only by kinetic energy at the time of projection. Nevertheless, the surface of the substance can be uniformly finished. In addition, since it contains almost no components other than molybdenum disulfide, it can be applied to a wide range of material surfaces regardless of compatibility with synthetic resins and the like.For example, besides metals, modification of surfaces made of resin, glass, and ceramics Can be suitably used.
【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。The reason why the use of the material for projecting molybdenum disulfide of the present invention reduces the friction coefficient and can maintain its durability high has not yet been completely elucidated. However, when the material for projecting molybdenum disulfide of the present invention is projected onto a material surface at a high speed, 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, since the effect is maintained even if the surface film is peeled off, 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 presumed that a modified surface layer having higher adhesion and stronger adhesion to the underlying material is formed.
【００１０】[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。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the material for projecting molybdenum disulfide of the present invention will be described in more detail.
【００１１】本発明の投射用材料は、平均粒子径約１μ
ｍ以上、好ましくは１０μｍ以上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。The projection material of the present invention has an average particle size of about 1 μm.
m, preferably 10 μm or more molybdenum disulfide (MoS 2 ) in a proportion of about 95% by weight or more, preferably about 98% by weight or more. If the average particle diameter is less than about 1 μm, it becomes difficult to effectively lower the surface friction coefficient even when the material is projected onto the material surface at a high speed.
【００１２】二硫化モリブデン（ＭｏＳ2）の粒子径に
ついて更に言えば、１０μ以上の粒子を５０重量％以上
含有させのが好ましく、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。粒度の上限
値については、現在、平均粒子径約２０μｍのものにつ
いて優れた改質効果を確認しており、これより更に大き
な粒度についても優れた改質効果を発揮するものと予想
することができる。しかし、天然物である二硫化モリブ
デン（ＭｏＳ2）は、現実に平均粒子径２０μｍを超え
るものを入手することが極めて困難であり、安定して供
給することは想定できない。そのため、今のところ本発
明では平均粒子径約２０μｍを上限値とする。More specifically, regarding the particle size of molybdenum disulfide (MoS 2 ), it is preferable that particles of 10 μm or more be contained in 50% by weight or more, and it is particularly preferable that particles of 5 μm or less be suppressed to 20% by weight or less. . Regarding the upper limit of the particle size, an excellent modifying effect has been confirmed for those having an average particle size of about 20 μm, and it can be expected that an excellent modifying effect will be exhibited for even larger particle sizes. . However, it is extremely difficult to obtain molybdenum disulfide (MoS 2 ), which is a natural product, having an average particle diameter of more than 20 μm, and it cannot be assumed that it is supplied stably. For this reason, in the present invention, the upper limit is set to an average particle diameter of about 20 μm.
【００１３】なお、本発明の二硫化モリブデン（ＭｏＳ
2）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。The molybdenum disulfide of the present invention (MoS
The particle diameter of 2 ) is obtained by assuming a sphere having the same volume from the volume of each molybdenum disulfide (MoS 2 ) particle, and converting the diameter of this sphere 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 that it is spherical. In fact, the present inventors have developed a measuring instrument (the Coulter Counter Multitizer III) by the electric resistance method.
The number and volume of the particles are actually measured using a mold, manufactured by Beckman Coulter (aperture tube 100 μm), and the particle size is measured. The particle diameter can be adjusted to a desired average particle diameter range by changing a set value (classified particle diameter) of a classifier. Further, the average particle diameter means an average value of the particle diameter of molybdenum disulfide particles contained in the material for projecting molybdenum disulfide used in a certain process.
【００１４】本発明において二硫化モリブデン（ＭｏＳ
2）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。In the present invention, molybdenum disulfide (MoS)
The reason that the purity of 2 ) is limited to about 95% by weight or more, preferably about 98% by weight or more means that the material for projecting molybdenum disulfide is composed only of molybdenum disulfide (MoS 2 ) obtained as a natural product. is there. That is, the purity of molybdenum disulfide (MoS 2 ) available as a natural product is about 95% by weight to about 99% by weight, and no substance other than molybdenum disulfide (MoS 2 ) obtained as a natural product is intentionally added. It means.
【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。The material for projecting molybdenum disulfide of the present invention comprises:
It is preferable to use for projection at a projection speed of 100 m / S or more. This is because when the projection speed is significantly lower than 100 m / S, the molybdenum disulfide particles cannot be sufficiently accelerated, and the effect of driving the material surface may be insufficient. Currently, the projection speed is 100m
It has been confirmed that projection with a projection speed of 200 m / S can obtain a more excellent effect of lowering the friction coefficient than projection with / S.
【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。As the projection method, any currently known method capable of jetting a projection material onto a material surface at high speed can be adopted. For example, a method of projecting a blast material onto a material surface by wind pressure, specifically, a method of spraying molybdenum disulfide powder from a nozzle with compressed air or compressed halogen gas onto a material surface using a spray gun or the like is employed. In this case, a commercially available shot peening machine or a sand blast machine can be used as the injection device. In the projection of the molybdenum disulfide projection material of the present invention, it is preferable to collect the projection material that has not adhered by colliding with the material surface and repeatedly project the material onto the material surface. Theoretically, all molybdenum disulfide particles can be effectively used until the particle diameter is less than 1 μm, and furthermore, it is expected that the effect of driving the shot material can be further enhanced by increasing the total amount of the shot material to the material surface.
【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。The molybdenum disulfide projection material of the present invention comprises:
As described above, it can be used for modifying surfaces of various materials, but among others, it can be effectively used for modifying surfaces of materials composed of any of metals, resins, glasses, and ceramics, particularly for reducing friction. It exhibits an extremely excellent effect as a projectile on the surface of a substance made of a metal, especially an aluminum alloy or iron. More specifically, it is particularly preferably used for reforming parts such as shafts and bearings of various machines, pistons, shafts, con-lots, piston rings, and cylinder bores in internal combustion engines, which require low frictional resistance and stable sliding. be able to.
【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。(Embodiment) Hereinafter, a material for projecting molybdenum disulfide as an embodiment of the present invention will be described.
【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。As a result of measuring the component composition of the molybdenum disulfide powder of the present example, 99.68% by weight of molybdenum disulfide, 0.16% by weight of iron and an iron compound, 0.06% by weight of aluminum and an aluminum compound, sodium and sodium It contained 0.02% by weight of compound, 0.02% by weight of calcium and calcium compound, and 0.06% by weight of lead and lead compound.
【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１００μ
ｍ））を用いた。The molybdenum disulfide powder having the above composition is classified using a classifier, and contains molybdenum disulfide powder of 10 μm to 20 μm in an amount of 50% by weight or more, and molybdenum disulfide powder of 5 μm or less in an amount of 20% by weight or less, The rest is 5 μm ~
A material for projecting molybdenum disulfide, which is molybdenum disulfide powder of 10 μm, was prepared. In this case, the particle size measurement,
Coulter Counter Multitizer III (Beckman Coulter, Inc. (Aperture tube 100μ)
m)) was used.
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ１０Ｎ 50:04 Ｃ１０Ｎ 50:04 50:08 50:08 (72)発明者 荻原 秀実 埼玉県和光市中央１丁目４番１号 株式会 社本田技術研究所内 (72)発明者 石渡 正人 東京都江戸川区松江５丁目２番24号 株式 会社不二製作所内 (72)発明者 豊田 峰永 東京都中央区日本橋本町１−９−４ 株式 会社ダイゾーニチモリ事業部東京営業所内 Ｆターム(参考） 4H104 AA19A EA08A FA06 QA09 QA12 4K044 AA02 AA12 AA13 AA16 BA19 BC01 CA23 CA51 Continued on the front page (51) Int.Cl. 7 Identification FI FI Theme Court II (Reference) C10N 50:04 C10N 50:04 50:08 50:08 (72) Inventor Hidemi Ogiwara 1-4-4 Chuo, Wako-shi, Saitama No. 1 Inside Honda R & D Co., Ltd. (72) Inventor Masato Ishiwata 5-2-2, Matsue, Edogawa-ku, Tokyo Inside Fuji Manufacturing Co., Ltd. (72) Inventor Minei Toyoda 1-9 Nihonbashi Honcho, Chuo-ku, Tokyo -4 Daisonichi Chimori Co., Ltd. Tokyo sales office F term (reference) 4H104 AA19A EA08A FA06 QA09 QA12 4K044 AA02 AA12 AA13 AA16 BA19 BC01 CA23 CA51
Claims (3)
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。1. A material for projecting molybdenum disulfide comprising about 95% by weight or more of molybdenum disulfide having an average particle size of about 1 μm to about 20 μm.
ずれかからなる物質表面への投射に用いることを特徴と
する請求項１に記載の二硫化モリブデン投射用材料。2. The material for projecting molybdenum disulfide according to claim 1, wherein the material is used for projecting on a surface of a substance made of any of metal, resin, glass and ceramics.
ることを特徴とする請求項１又は２に記載の二硫化モリ
ブデン投射用材料。3. The molybdenum disulfide projection material according to claim 1, wherein the material is used for projection at a projection speed of 100 m / S or more.
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