EP0423063A1 - Protective coating for spinning machine parts - Google Patents

Protective coating for spinning machine parts Download PDF

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Publication number
EP0423063A1
EP0423063A1 EP90810650A EP90810650A EP0423063A1 EP 0423063 A1 EP0423063 A1 EP 0423063A1 EP 90810650 A EP90810650 A EP 90810650A EP 90810650 A EP90810650 A EP 90810650A EP 0423063 A1 EP0423063 A1 EP 0423063A1
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EP
European Patent Office
Prior art keywords
protective layer
layer according
phase
chromium
metallic
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Application number
EP90810650A
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German (de)
French (fr)
Inventor
Gerard Barbezat
Werner Straub
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Sulzer AG
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Sulzer AG
Gebrueder Sulzer AG
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Publication of EP0423063A1 publication Critical patent/EP0423063A1/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material

Definitions

  • the invention relates to a protective layer for surfaces of metallic textile machine parts, in particular spinning machine parts, which protective layer consists of ceramic particles of at least two different, non-metallic elements embedded in a metallic matrix.
  • the object of the invention is therefore to provide a protective layer for the highly stressed components of textile machines, which better meets the requirements with regard to abrasion resistance than the known protective layers.
  • one hard particle consists of a carbide phase and the other consists of an oxidic phase.
  • the disadvantages of the low toughness of oxidic hard materials can be largely compensated for.
  • This embedding and the adhesive strength of the protective layer on the component or substrate can be improved if the oxidic particles were generated during the coating process using the HVC (high-speed flame spraying) process.
  • the HVC process is a flame spray process developed in recent years in which the spray particles reach speeds that are above the speed of sound (Sulzer Technical Review (STR) 4/1988, page 4-10).
  • Nickel or cobalt-based alloys that contain at least chromium as alloy components have proven to be a suitable metal matrix for the coating.
  • the carbidic phase preferably consists of tungsten carbides, which advantageously consist of at least 70% tungsten carbide (WC).
  • the tungsten carbides at least partially by carbides of the metals titanium (Ti), tantalum (Ta), vanadium (Va) and / or To replace niobium (Nb).
  • the oxidic component of the protective layer which makes up up to 5% by weight, is preferably in the form of chromium oxides, in particular as chromium oxide (Cr2O3).
  • the proportion of the oxidic phase can be varied for the HVC process by a suitable choice of the gas parameters - in particular the ratio between oxygen and fuel gas in the flame spray jet.
  • the fuel gases used are primarily propane (C3H8), propylene (C3H6) or hydrogen (H2).
  • the protective layer consists of a cobalt / chromium alloy as a metallic matrix and tungsten carbide (WC) as a carbide, and chromium oxide (Cr2O3) as an oxidic phase.
  • One criterion for a high abrasion resistance of the protective layer is its surface roughness;
  • the desired mean roughness values can be influenced in a targeted manner by suitable selection of the particle size of the wettable powder.
  • Metallic materials based on iron, aluminum, copper or titanium are used as substrates.
  • the surface to be coated is first degreased with the help of solvents and then sandblasted with granular material made of aluminum oxide (corundum, Al2O3).
  • the grain size of Al2O3 is, for example, between 0.12 and 0.25 mm.
  • the substrate is approximately 100 mm from the sandblasting source, which accelerates the grains at a pressure of approximately 3 bar.
  • wettable powder which consists of% by weight 86% tungsten carbide (WC) and 14% of CoCr 30 cobalt base alloy consists.
  • the particle size distribution of the wettable powder depends on the desired surface roughness of the surface provided with a protective layer in the sprayed state.
  • the layer is applied in a system as shown in the mentioned article from STR 4/88.
  • a fuel gas stream is emitted for a powder of the fraction + 5 -25 ⁇ m 60 l / min propane and 500 l / min oxygen used, which is mixed with 20 l / min nitrogen as the carrier gas.
  • the powder is introduced in an amount of 14 g / min into the gas jet, with velocities between the substrate and pul fashionendem gas jet of 30-60 m / min and temperature of 2900 o C.
  • the distance between the spraying system and substrate is about 250 mm.
  • the spraying process in which the spray gun, controlled by a robot, sweeps the surface to be coated line by line, is maintained until a layer thickness of 20-50 ⁇ m is reached.
  • the layer essentially consists of a metallic matrix of Co, Cr mixed crystals in which about 80% by weight of tungsten carbides and 5% by weight of chromium oxides are embedded; both Tungsten carbides have a share of about 72% in WC, while the chromium oxides, which - as can be found in metallographic tests or by X-ray fine structure analysis based on the distribution of the phases - formed during the coating process, are present as Cr2O3 alone.
  • the Ra values of the protective layer in the sprayed state in the present case are 1.5-2.0 ⁇ m.
  • the layers have high adhesive strength.

Abstract

The novel protective layers for surfaces of textile machine parts, in particular spinning machine parts, consist of a metallic matrix in which carbide and oxide ceramic particles are incorporated as hard materials.

Description

Die Erfindung betrifft eine Schutzschicht für Oberflächen von metallischen Textilmaschinenteilen, insbesondere Spinnmaschinenteilen, welche Schutzschicht aus in eine metallische Matrix eingebetteten Keramikpartikeln von mindestens zwei verschiedenen, nichtmetallischen Elemen­ten besteht.The invention relates to a protective layer for surfaces of metallic textile machine parts, in particular spinning machine parts, which protective layer consists of ceramic particles of at least two different, non-metallic elements embedded in a metallic matrix.

Bei der Aufbereitung von Garnen zu Fäden sind einige Bau­teile, z.B. Rotoren oder Auflösewalzen von Spinnmaschi­nen, einem erheblichen Verschleiss ausgesetzt. Es ist daher bekannt, die Oberfläche derartiger Teile mit einer keramischen Hartstoff-Beschichtung zu versehen (siehe z.B. A. Inzenhofer "Das CVD-Verfahren", Teil 2, "technik heute" 3-1986, S. 38/39).When processing yarns into threads, some components, e.g. Rotors or opening rollers of spinning machines, exposed to considerable wear. It is therefore known to provide the surface of such parts with a ceramic hard material coating (see, for example, A. Inzenhofer "The CVD Process", Part 2, "Technology Today" 3-1986, pp. 38/39).

In der Praxis haben sich Abrasionsbeständigkeit und mechanische Belastbarkeit der mit bekannten Beschich­tungen versehenen Textilmaschinenteile als ungenügend erwiesen. Aufgabe der Erfindung ist es daher, für die hochbelasteten Bauteile von Textilmaschinen eine Schutz­schicht zu schaffen, die den Anforderungen hinsichtlich Abrasionsbeständigkeit besser entspricht als die bekann­ten Schutzschichten.In practice, the abrasion resistance and mechanical strength of the textile machine parts provided with known coatings have proven to be insufficient. The object of the invention is therefore to provide a protective layer for the highly stressed components of textile machines, which better meets the requirements with regard to abrasion resistance than the known protective layers.

Diese Aufgabe wird mit der Erfindung dadurch gelöst, dass die einen Hartpartikeln aus einer karbidischen und die anderen aus einer oxidischen Phase bestehen.This object is achieved with the invention in that one hard particle consists of a carbide phase and the other consists of an oxidic phase.

Während die karbidische Phase in bekannter Weise vor allem eine hohe Abrasionsbeständigkeit gewährleistet, verbessert die oxidische Phase in erster Linie die Gleit­eigenschaften zwischen dem textilen Garn und dem Bauteil. Sie weist daneben jedoch ebenfalls eine hohe Abrasionsbe­ständigkeit auf. Durch ihre Einbettung in die metallische Phase können die Nachteile der geringen Zähigkeit von oxidischen Hartstoffen weitgehend kompensiert werden. Diese Einbettung sowie die Haftfestigkeit der Schutz­schicht auf dem Bauteil oder Substrat können verbessert werden, wenn die oxidischen Partikeln während des Beschichtungsprozesses nach dem HVC(Hochgeschwindigkeits­flammspritz)-Verfahren erzeugt worden sind.While the carbidic phase above all ensures high abrasion resistance in a known manner, the oxidic phase primarily improves the sliding properties between the textile yarn and the component. However, it also has high abrasion resistance. By embedding them in the metallic phase, the disadvantages of the low toughness of oxidic hard materials can be largely compensated for. This embedding and the adhesive strength of the protective layer on the component or substrate can be improved if the oxidic particles were generated during the coating process using the HVC (high-speed flame spraying) process.

Das HVC-Verfahren ist ein in den letzten Jahren entwik­keltes Flammspritzverfahren, bei dem die Spritzpartikel Geschwindigkeiten erreichen, die über der Schallgeschwin­digkeit liegen (Sulzer Technische Rundschau (STR) 4/1988, Seite 4-10).The HVC process is a flame spray process developed in recent years in which the spray particles reach speeds that are above the speed of sound (Sulzer Technical Review (STR) 4/1988, page 4-10).

Als Metallmatrix für die Beschichtung haben sich Nickel- oder Kobaltbasis-Legierungen bewährt, die als Legierungs­komponenten mindestens Chrom enthalten. Die karbidische Phase besteht bevorzugt aus Wolframkarbiden, die vorteil­hafterweise zumindestens 70 % aus Wolframkarbid (WC) be­stehen.Nickel or cobalt-based alloys that contain at least chromium as alloy components have proven to be a suitable metal matrix for the coating. The carbidic phase preferably consists of tungsten carbides, which advantageously consist of at least 70% tungsten carbide (WC).

Es ist jedoch auch möglich, bei der karbidischen Phase, die bevorzugt 50 bis 90 Gew.% der Beschichtung "dar­stellt", die Wolframkarbide mindestens teilweise durch Karbide der Metalle Titan (Ti), Tantal (Ta), Vanadium (Va) und/oder Niob (Nb) zu ersetzen.However, it is also possible in the carbidic phase, which preferably "represents" 50 to 90% by weight of the coating, the tungsten carbides at least partially by carbides of the metals titanium (Ti), tantalum (Ta), vanadium (Va) and / or To replace niobium (Nb).

Der oxidische Bestandteil der Schutzschicht, der bis zu 5 Gew.% ausmacht, liegt bevorzugt in der Form von Chrom­oxiden, insbesondere als Chromoxid (Cr₂O₃), vor. Der An­teil der oxidischen Phase kann dabei durch geeignete Wahl der Gasparameter - insbesondere des Verhältnisses zwi­schen Sauerstoff und Brenngas in dem Flammspritz-Strahl - für das HVC-Verfahren variiert werden. Als Brenngase dienen in erster Linie Propan (C₃H₈), Propylen (C₃H₆) oder Wasserstoff (H₂).The oxidic component of the protective layer, which makes up up to 5% by weight, is preferably in the form of chromium oxides, in particular as chromium oxide (Cr₂O₃). The proportion of the oxidic phase can be varied for the HVC process by a suitable choice of the gas parameters - in particular the ratio between oxygen and fuel gas in the flame spray jet. The fuel gases used are primarily propane (C₃H₈), propylene (C₃H₆) or hydrogen (H₂).

In experimentellen Untersuchungen hat sich besonders eine Schutzschicht bewährt, in der die Schutzschicht aus einer Kobalt/Chrom-Legierung als metallischer Matrix und aus Wolframkarbid (WC) als karbidischer, sowie Chromoxid (Cr₂O₃) als oxidischer Phase besteht.In experimental studies, a protective layer has proven particularly useful, in which the protective layer consists of a cobalt / chromium alloy as a metallic matrix and tungsten carbide (WC) as a carbide, and chromium oxide (Cr₂O₃) as an oxidic phase.

Ein Kriterium für eine hohe Abrasionsbeständigkeit der Schutzschicht bildet ihre Oberflächenrauhigkeit; für die Lösung der eingangs geschilderten Aufgabe haben sich dabei Schutzschichten der genannten Art als günstig er­wiesen, deren arithmetischer Mittenrauhwert (Ra) im ge­spritzten Zustand zwischen 1,5 und 7 µm beträgt und in einem Streübereich von ± 1 µm liegt. Die gewünschten Mittenrauhwerte können dabei in gewissem Umfang durch geeignete Auswahl der Korngrösse des Spritzpulvers ge­zielt beeinflusst werden.One criterion for a high abrasion resistance of the protective layer is its surface roughness; Protective layers of the type mentioned, whose arithmetic mean roughness (Ra) in the sprayed state is between 1.5 and 7 μm and in a scattering range of ± 1 μm, have proven to be favorable for the solution of the problem described at the outset. To a certain extent, the desired mean roughness values can be influenced in a targeted manner by suitable selection of the particle size of the wettable powder.

Als Substrate dienen metallische Werkstoffe auf Eisen-, Aluminium-, Kupfer- oder Titanbasis.Metallic materials based on iron, aluminum, copper or titanium are used as substrates.

Im folgenden wird die Erfindung anhand eines Ausführungs­beispiels näher erläutert; in diesem soll eine sogenannte Auflösewalze einer Spinnmaschine mindestens auf Teilen ihrer Oberfläche beschichtet werden.The invention is explained in more detail below using an exemplary embodiment; in this a so-called opening roller of a spinning machine is to be coated at least on parts of its surface.

Um die Haftfestigkeit der Schicht auf dem Substrat, das in diesem Fall aus gehärtetem Stahl besteht, zu erhöhen, wird die zu beschichtende Oberfläche zunächst mit Hilfe von Lösungsmitteln entfettet und anschliessend mit körni­gem Material aus Aluminiumoxid (Korund, Al₂O₃) sandge­strahlt. Die Korngrösse des Al₂O₃ liegt beispielsweise zwischen 0,12 und 0,25 mm. Das Substrat hat einen Abstand von etwa 100 mm von der Sandstrahlquelle, die die Körner mit einem Druck von etwa 3 bar beschleunigt.In order to increase the adhesive strength of the layer on the substrate, which in this case consists of hardened steel, the surface to be coated is first degreased with the help of solvents and then sandblasted with granular material made of aluminum oxide (corundum, Al₂O₃). The grain size of Al₂O₃ is, for example, between 0.12 and 0.25 mm. The substrate is approximately 100 mm from the sandblasting source, which accelerates the grains at a pressure of approximately 3 bar.

Als Spritzpulver wird im Handel erhältliches plasma­agglomeriertes Pulver oder gebrochenes oder gemahlenes Sinterpulver verwendet, welches in Gew.% aus
86 % Wolframkarbid (WC) und
14 % der Kobaltbasislegierung CoCr 30
besteht.Commercially available plasma-agglomerated powder or broken or ground sinter powder is used as wettable powder, which consists of% by weight
86% tungsten carbide (WC) and
14% of CoCr 30 cobalt base alloy
consists.

Wie bereits erwähnt, richtet sich die Korngrössenvertei­lung des Spritzpulvers nach der angestrebten Oberflächen­rauhigkeit der mit einer Schutzschicht versehenen Ober­fläche im gespritzten Zustand.As already mentioned, the particle size distribution of the wettable powder depends on the desired surface roughness of the surface provided with a protective layer in the sprayed state.

Nachstehend sei der Zusammenhang der Korngrössenvertei­lung des Spritzpulvers mit dem arithmetischen Mittenrauh­wert Ra der gespritzten Schicht wiedergegeben, wobei für das Aufbringen der Schutzschicht die später beschriebenen Parameter verwendet worden sind. Korngrösse in µm Ra-Wert in µm (gemessen über eine Länge von 1,5 mm) + 15 - 60 5 - 7 + 5 - 45 3 - 5 + 5 - 25 2 - 3 + 5 - 12 1,5 - 2 The relationship between the grain size distribution of the wettable powder and the arithmetic mean roughness Ra of the sprayed layer is shown below, the parameters described later being used for the application of the protective layer. Grain size in µm Ra value in µm (measured over a length of 1.5 mm) + 15 - 60 5 - 7 + 5 - 45 3 - 5 + 5 - 25 2-3 + 5 - 12 1.5 - 2

Das Aufbringen der Schicht erfolgt in einer Anlage, wie sie in dem erwähnten Artikel aus STR 4/88 gezeigt ist. Für ein Pulver der Fraktion + 5 -25 µm wird dabei ein Brenngasstrom aus
60 l/min Propan und
500 l/min Sauerstoff
eingesetzt, dem als Trägergas 20 l/min Stickstoff beige­mischt ist.The layer is applied in a system as shown in the mentioned article from STR 4/88. A fuel gas stream is emitted for a powder of the fraction + 5 -25 µm
60 l / min propane and
500 l / min oxygen
used, which is mixed with 20 l / min nitrogen as the carrier gas.

Das Pulver wird in einer Menge von 14 g/min in den Gas­strahl eingebracht, wobei Geschwindigkeiten zwischen Sub­strat und pulvertragendem Gasstrahl von 30-60 m/min und Temperaturen von 2900o C erreicht werden. Der Abstand zwischen Spritzanlage und Substrat beträgt etwa 250 mm.The powder is introduced in an amount of 14 g / min into the gas jet, with velocities between the substrate and pulvertragendem gas jet of 30-60 m / min and temperature of 2900 o C. The distance between the spraying system and substrate is about 250 mm.

Der Spritzvorgang, bei dem die Spritzpistole von einem Roboter gesteuert die zu beschichtende Oberfläche zeilen­weise überstreicht, wird aufrechterhalten bis eine Schichtdicke von 20-50 µm erreicht ist.The spraying process, in which the spray gun, controlled by a robot, sweeps the surface to be coated line by line, is maintained until a layer thickness of 20-50 µm is reached.

Wie nachträgliche Analysen gezeigt haben, besteht die Schicht im wesentlichen aus einer metallischen Matrix aus Co,Cr-Mischkristallen, in die etwa 80 Gew.% Wolfram­karbide und 5 Gew.% Chromoxide eingelagert sind; bei den Wolframkarbiden hat dabei WC einen Anteil von etwa 72 %, während die Chromoxide, die sich - wie bei metallo­graphischen Prüfungen oder durch Röntgen-Feinstruktur­analysen aufgrund der Verteilung der Phasen festgestellt werden kann - während des Beschichtungsprozesses gebildet haben, allein als Cr₂O₃ vorliegen.As subsequent analyzes have shown, the layer essentially consists of a metallic matrix of Co, Cr mixed crystals in which about 80% by weight of tungsten carbides and 5% by weight of chromium oxides are embedded; both Tungsten carbides have a share of about 72% in WC, while the chromium oxides, which - as can be found in metallographic tests or by X-ray fine structure analysis based on the distribution of the phases - formed during the coating process, are present as Cr₂O₃ alone.

Die Ra-Werte der Schutzschicht im gespritzen Zustand betragen im vorliegenden Fall 1,5 - 2,0 µm. Die Schichten weisen eine hohe Haftfestigkeit auf.The Ra values of the protective layer in the sprayed state in the present case are 1.5-2.0 µm. The layers have high adhesive strength.

Claims (11)

1. Schutzschicht für Oberflächen von metallischen Textil­maschinenteilen, insbesondere Spinnmaschinenteilen, welche Schutzschicht aus in eine metallische Matrix ein­gebetteten Keramikpartikeln von mindestens zwei verschiedenen, nichtmetallischen Elementen auf einem metallischen Substrat besteht, dadurch gekennzeichnet, dass die einen Hartpartikeln aus einer karbidischen und die anderen aus einer oxidischen Phase bestehen.1. Protective layer for surfaces of metallic textile machine parts, in particular spinning machine parts, which protective layer consists of ceramic particles of at least two different, non-metallic elements embedded in a metallic matrix on a metallic substrate, characterized in that one hard particle consists of a carbide and the other an oxide Phase exist. 2. Schutzschicht nach Anspruch 1, dadurch gekennzeichnet, dass die oxidischen Partikeln während des Beschichtungs­prozesses nach dem HVC(Hochgeschwindigkeitsflammspritz)-­Verfahren erzeugt worden sind.2. Protective layer according to claim 1, characterized in that the oxidic particles have been generated during the coating process by the HVC (high-speed flame spraying) method. 3. Schutzschicht nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, dass die Metallmatrix aus einer mindestens Chrom enthaltenden Nickel- oder Kobalt-Basislegierung besteht.3. Protective layer according to claim 1 or 2, characterized in that the metal matrix consists of a nickel or cobalt-based alloy containing at least chromium. 4. Beschichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die karbidische Phase aus Wolfram­karbiden besteht.4. Coating according to one of claims 1 to 3, characterized in that the carbidic phase consists of tungsten carbides. 5. Schutzschicht nach Anspruch 4, dadurch gekennzeichnet, dass die Wolframkarbide zu mindestens 70 % aus Wolfram­karbid (WC) bestehen.5. Protective layer according to claim 4, characterized in that the tungsten carbides consist of at least 70% tungsten carbide (WC). 6. Schutzschicht nach Anspruch 4 oder 5, dadurch gekenn­zeichnet, dass Wolframkarbide mindestens teilweise durch Karbide der Metalle Titan, Tantal, Vanadium und/oder Niob ersetzt sind.6. Protective layer according to claim 4 or 5, characterized in that tungsten carbides are at least partially replaced by carbides of the metals titanium, tantalum, vanadium and / or niobium. 7. Schutzschicht einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Schutzschicht 50 bis 90 Gew.% an karbidischer Phase enthält.7. Protective layer according to one of claims 1 to 6, characterized in that the protective layer contains 50 to 90% by weight of the carbidic phase. 8. Schutzschicht nach einem der Ansprüche 1 bis 7, da­durch gekennzeichnet, dass die oxidische Phase aus Chrom­oxiden besteht.8. Protective layer according to one of claims 1 to 7, characterized in that the oxidic phase consists of chromium oxides. 9. Schutzschicht nach Anspruch 8, dadurch gekennzeichnet, dass die Schutzschicht bis zu 5 Gew.% an Chromoxiden ent­hält.9. Protective layer according to claim 8, characterized in that the protective layer contains up to 5% by weight of chromium oxides. 10. Schutzschicht nach einem der Ansprüche 4 bis 9, da­durch gekennzeichnet, dass die Schutzschicht aus einer Kobalt/Chrom-Legierung als metallischer Matrix und aus Wolframkarbid (WC) als karbidischer, sowie Chromoxid (Cr₂O₃) als oxidischer Phase besteht.10. Protective layer according to one of claims 4 to 9, characterized in that the protective layer consists of a cobalt / chromium alloy as a metallic matrix and of tungsten carbide (WC) as a carbide, and chromium oxide (Cr₂O₃) as an oxidic phase. 11. Schutzschicht nach einem der Ansprüche 1 bis 10, da­durch gekennzeichnet, dass der arithmetische Mittenrauh­wert Ra der Schutzschicht im gespritzten Zustand zwischen 1,5 und 7 µm beträgt und in einem Streübereich von ± 1 µm liegt.11. Protective layer according to one of claims 1 to 10, characterized in that the arithmetic mean roughness R a of the protective layer in the sprayed state is between 1.5 and 7 µm and is in a scattering range of ± 1 µm.
EP90810650A 1989-10-11 1990-08-29 Protective coating for spinning machine parts Withdrawn EP0423063A1 (en)

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CH3704/89 1989-10-11
CH3704/89A CH679047A5 (en) 1989-10-11 1989-10-11

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EP0631961A1 (en) * 1993-06-19 1995-01-04 Hoechst Aktiengesellschaft Yarn guiding component with an improved outer surface
US5897947A (en) * 1995-01-31 1999-04-27 Maschinenfabrik Rieter Ag Method of coating and thread guiding elements produced thereby

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JP3719971B2 (en) * 2001-11-06 2005-11-24 株式会社椿本チエイン Silent chain with wear-resistant coating

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