CN116335844A - Two-stroke marine piston ring and manufacturing process thereof - Google Patents
Two-stroke marine piston ring and manufacturing process thereof Download PDFInfo
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- CN116335844A CN116335844A CN202310317377.9A CN202310317377A CN116335844A CN 116335844 A CN116335844 A CN 116335844A CN 202310317377 A CN202310317377 A CN 202310317377A CN 116335844 A CN116335844 A CN 116335844A
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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
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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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/027—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal matrix material comprising a mixture of at least two metals or metal phases or metal matrix composites, e.g. metal matrix with embedded inorganic hard particles, CERMET, MMC.
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- 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
- C23C4/08—Metallic material containing only metal elements
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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
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/131—Wire arc spraying
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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
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F5/00—Piston rings, e.g. associated with piston crown
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Abstract
The invention discloses a piston ring for a two-stroke ship and a manufacturing process thereof; the piston ring includes: a piston ring substrate, a chromium-based composite coating and an aluminum bronze coating; the piston ring substrate is provided with an outer circular surface; the composite plating layer and the aluminum bronze coating layer are laminated on the outer circular surface; the composite coating is formed by compounding 5-20 layers of units, and the composite coating is a chromium-based ceramic or diamond composite coating. The process comprises the following steps: s1, providing a piston ring matrix, electroplating a chromium layer on the outer circumferential surface of the piston ring matrix, embedding ceramic materials or diamond particles in the chromium layer, and repeating the processes of electroplating the chromium layer and embedding the ceramic materials or diamond particles until the composite plating layer reaches the thickness requirement; s2, cleaning a piston ring substrate, covering and shielding the part except the composite plating layer on the piston ring substrate, and then carrying out sand blasting treatment on the surface of the composite plating layer; s3, after sand blasting, spraying an aluminum bronze coating on the chromium-based composite coating by adopting an electric arc or plasma spraying process; and S4, performing micro-polishing treatment on the aluminum bronze coating to obtain the piston ring for the two-stroke ship.
Description
Technical Field
The invention relates to the technical field of internal combustion engines, in particular to a two-stroke marine piston ring and a manufacturing process thereof.
Background
Because the two-stroke marine engine has larger difference between the use condition and other engines, heavy oil lubrication and low rotation speed can lead piston rings to fretting wear in the engine, the working environment has high humidity and long continuous working time, and the piston rings not only need corrosion resistance and fretting wear resistance, but also have long-term wear resistance.
The aluminum bronze coating not only has high heat conductivity, antifriction and wear resistance, corrosion resistance and heat resistance, but also has good fretting wear resistance, and is widely applied to marine engine piston rings. With the gradual weight reduction of marine engine oil products, two problems exist in the aluminum bronze piston ring product produced according to the scheme of the prior patent document CN 1225152A: (1) poor long-term wear resistance; (2) slight cylinder pulling phenomenon to the cylinder sleeve.
The current improvement thought aiming at the problems is as follows: a chromium-based composite coating is firstly prepared before the existing aluminum bronze coating, and the long-term wear resistance requirement can be well met through the chromium-based composite coating, but in the prior art, the chromium-based composite coating is not easy to combine with the aluminum bronze layer because of high coating hardness; the aluminum bronze coating treated according to the scheme of the patent CN109055882A, which is a sand blasting process suitable for plasma spraying, has the problem of poor bonding force with the chromium-based composite coating.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a wear-resistant two-stroke marine piston ring and a manufacturing method thereof, not only can meet the long-term wear resistance requirement of the outer circle of the piston ring, but also can solve the problem of cylinder pulling of a two-stroke marine engine, furthest meets the full life cycle requirement of the two-stroke marine engine, and further solves the problem of poor bonding force between an aluminum bronze coating and a chromium-based composite coating.
The invention is realized by the following technical scheme:
a two-stroke marine piston ring, said piston ring comprising: a piston ring substrate, a chromium-based composite coating and an aluminum bronze coating; the piston ring substrate is provided with an outer circular surface; the chromium-based composite plating layer and the aluminum bronze coating are sequentially laminated on the outer circular surface; the chromium-based composite coating is formed by compositing 5-20 layers of units, and is a chromium-based ceramic composite coating or a chromium-based diamond composite coating; the chromium-based composite coating is used for improving the long-term wear resistance, high temperature resistance and corrosion resistance of the piston ring; the aluminum bronze coating is used for improving the antifriction property and fretting wear resistance of the piston ring.
Specifically, the invention provides a solution for the current situation that the long-term wear resistance of an aluminum bronze coating on the outer circular surface of a piston ring for a two-stroke ship is poor: firstly electroplating a chromium-based ceramic composite coating or a chromium-based diamond composite coating wear-resistant layer on the outer circular surface of the piston ring of the two-stroke ship, wherein the chromium-based composite coating consists of 5-20 unit composite layers; the thickness of the chromium-based ceramic composite coating is 0.15-0.30 mm, the thickness of the chromium-based diamond composite coating is 0.05-0.20 mm, and the chromium-based composite coating improves the long-term wear resistance, high temperature resistance and corrosion resistance of the piston ring; then, an aluminum bronze coating is sprayed outside the chromium-based composite coating, the thickness of the aluminum bronze coating is 0.20-0.60 mm, and the antifriction property and fretting wear resistance of the piston ring are improved.
Further, a piston ring for a two-stroke ship: the piston ring substrate is made of one of spheroidal graphite cast iron, vermicular graphite cast iron, alloy cast iron, steel and cast steel.
Further, a piston ring for a two-stroke ship: the thickness of the chromium-based ceramic composite coating is 0.15-0.30 mm; the ceramic material in the chromium-based ceramic composite coating is selected from one of aluminum oxide, silicon nitride, boron nitride, silicon carbide and boron carbide.
Preferably, when the chromium-based ceramic composite coating is a chromium-based alumina composite coating: the content of alumina particles in the chromium-based alumina composite coating is 0.5 to 6.0 weight percent, and the particle size of the alumina particles is 0.1 to 5.0 mu m; when the chromium-based ceramic composite coating is a chromium-based silicon nitride composite coating: the content of silicon nitride particles in the chromium-based silicon nitride composite coating is 1.0-4.0 wt%, and the particle size of the silicon nitride particles is 0.5-5.0 mu m.
Further, a piston ring for a two-stroke ship: the thickness of the chromium-based diamond composite coating is 0.05-0.2 mm; the grain diameter of diamond particles in the chromium-based diamond composite coating is 0.1-2.0 mu m.
Further, a piston ring for a two-stroke ship: the thickness of the aluminum bronze coating is 0.2-0.6 mm.
Further, the sand blasting method before spraying the aluminum bronze coating comprises the following steps: the sand blasting pressure is 0.4-0.6 MPa, the sand blasting medium is 20-36 # white corundum, and the roughness of the surface of the chromium-based composite coating after sand blasting is Rz 5-Rz 8. Preferably, the blasting pressure is 0.55MPa. The distance between the nozzle and the outer circular surface of the piston ring matrix is 40-60 mm.
Further, a piston ring for a two-stroke ship: the porosity of the aluminum bronze coating is 2-5%, the oxide content in the aluminum bronze coating is 13-18% by weight, and the hardness of the aluminum bronze coating is 90-120HV.
The manufacturing process of the piston ring for the two-stroke ship is characterized by comprising the following specific steps of:
s1, providing a piston ring substrate, electroplating a chromium layer on the outer circular surface of the piston ring substrate, then embedding ceramic materials or diamond particles in the chromium layer, and repeating the processes of electroplating the chromium layer and embedding the ceramic materials or diamond particles until the composite coating reaches the thickness requirement to form the chromium-based composite coating;
s2, cleaning the piston ring substrate, coating and shielding the part, except for the chromium-based composite plating layer, on the piston ring substrate after cleaning, and then carrying out sand blasting on the surface of the chromium-based composite plating layer;
s3, after sand blasting, adopting an electric arc or plasma spraying process to spray and form the aluminum bronze coating on the chromium-based composite coating;
and S4, performing micro-polishing treatment on the aluminum bronze coating to obtain the piston ring for the two-stroke ship.
Further, a manufacturing process of the piston ring for the two-stroke ship comprises the following steps: s2, cleaning the piston ring matrix by adopting ultrasonic waves and degreasing agents to remove oil stains on the ring body; coating and shielding the parts except the chromium-based composite plating layer on the piston ring substrate after cleaning, and then carrying out sand blasting on the surface of the chromium-based composite plating layer; wherein: the sand blasting pressure is 0.4-0.6 MPa, the sand blasting medium is 20-36 # white corundum, and the roughness of the surface of the chromium-based composite coating after sand blasting is Rz 5-Rz 8. Preferably, the sand blasting pressure is 0.55MPa, and the distance between the nozzle and the outer circular surface of the piston ring matrix is 40-60 mm.
Further, a manufacturing process of the piston ring for the two-stroke ship comprises the following steps: s3, after sand blasting, placing a piston ring substrate on a gasket, and then spraying the aluminum bronze coating on the chromium-based composite coating by adopting an electric arc or plasma spraying process; the gasket is used to separate the end faces of adjacent piston ring substrates when the piston rings are mass produced.
Specifically, in the step S3, a gasket with a thickness of 1-3 mm can be used to separate the ring from the end face of the ring (i.e. separate the two piston ring substrates by the gasket), and meanwhile, the outer circular surface of the piston ring is ensured to be flat, so that the phenomenon of coating adhesion after the piston ring is sprayed is prevented.
The manufacturing method of the piston ring for the two-stroke ship solves the problem of poor binding force between the aluminum bronze coating and the chromium-based composite coating, and ensures that the chromium-based composite coating and the aluminum bronze coating are combined more firmly and are not easy to peel off, thereby solving the problems of poor long-term wear resistance and cylinder pulling of the outer circle of the piston ring and meeting the full life cycle requirement of the two-stroke ship engine to the greatest extent.
The invention has the beneficial effects that:
(1) The invention provides a piston ring for a two-stroke ship and a manufacturing method thereof. The chromium-based composite coating at the bottom layer has high hardness, good long-term wear resistance, corrosion resistance and high temperature resistance; the outer aluminum bronze coating has good antifriction and fretting wear resistance, solves the problems of poor long-term wear resistance and slight cylinder pulling of the single-layer aluminum bronze piston ring, and meets the full life cycle requirement of the two-stroke marine engine to the maximum extent.
(2) The invention also provides a manufacturing method of the piston ring for the two-stroke ship, namely before spraying aluminum bronze on the chromium-based composite coating, sand blasting is firstly carried out to improve the adhesive force between the aluminum bronze coating and the chromium-based composite coating, so that the bonding strength reaches more than 30MPa, and the problem of poor bonding between the aluminum bronze coating and an electroplated layer (the chromium-based composite coating) is solved; the process also carries out micro-polishing treatment on the aluminum bronze coating to remove large particles on the surface of the aluminum bronze coating, and eliminates the problem of slight cylinder pulling in the initial running-in process; the process of the invention also provides a method for preventing the sticking between the piston rings in the spraying process, and the gasket with the height of about 1-3 mm is used for separating the ring from the end face of the ring, so that the phenomenon that the coating on the end face is peeled off due to the sticking of the coating on the end face after the piston rings are sprayed is eliminated, the quality product rate is improved by more than 50%, and the gasket is convenient to use and is suitable for mass production.
(3) The piston ring provided by the invention is a composite aluminized bronze piston ring, and the plating layer has good binding force, and the chromium-based composite plating layer has good wear resistance, corrosion resistance and high temperature resistance; the aluminum bronze coating has good initial running-in performance, solves the problems of wear resistance and cylinder pulling of the piston ring, and maximally meets the full life cycle requirement of the two-stroke marine engine. The piston ring for the two-stroke ship has the characteristics of long service life, low friction, high reliability and low maintenance cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a piston ring matrix in a piston ring for a two-stroke ship according to the present invention;
fig. 2 to 5 are schematic structural views of a piston ring for a two-stroke ship according to the present invention.
The marks in the figure: a piston ring substrate 1, a chromium-based composite coating 2, an aluminum bronze coating 3, an outer circular surface 1-1 and an end surface 1-2.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "upper," "lower," "left," "right," "top," "bottom," and the like indicate orientations or positional relationships, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may include one or more of the feature, either explicitly or implicitly. Moreover, the terms "first," "second," and the like, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein.
As shown in fig. 1 to 5, there is provided a piston ring for a two-stroke ship, characterized in that the piston ring comprises: a piston ring base 1, a chromium-based composite plating layer 2 and an aluminum bronze coating layer 3;
the piston ring base body 1 is provided with an outer circular surface 1-1 and an end surface 1-2; the chromium-based composite plating layer 2 and the aluminum bronze coating 3 are sequentially laminated on the outer circular surface 1-1;
the chromium-based composite coating 2 is formed by compositing 5-20 layers of units, and the chromium-based composite coating 2 is a chromium-based ceramic composite coating with the thickness of 0.15-0.3 mm or a chromium-based diamond composite coating with the thickness of 0.05-0.2 mm;
the chromium-based composite coating 2 is used for improving the long-term wear resistance, high temperature resistance and corrosion resistance of the piston ring; the aluminum bronze coating 3 is used for improving the antifriction property and fretting wear resistance of the piston ring, the thickness of the aluminum bronze coating 3 is 0.2-0.6 mm, the porosity of the aluminum bronze coating 3 is 2-5%, the oxide content in the aluminum bronze coating 3 is 13-18 wt%, and the hardness of the aluminum bronze coating 3 is 90-120HV.
Example 1
As shown in fig. 1 and 2, there is provided a rectangular piston ring for a two-stroke ship, the piston ring comprising: a piston ring matrix 1 made of vermicular graphite cast iron, a chromium-based composite coating 2 and an aluminum bronze coating 3;
the piston ring substrate 1 is provided with an outer circular surface 1-1 and a piston ring substrate end surface 1-2; the chromium-based composite plating layer 2 and the aluminum bronze coating 3 are sequentially laminated on the outer circular surface 1-1;
wherein: the chromium-based composite coating 2 is formed by compounding 5-20 layers of units, the chromium-based composite coating 2 is a chromium-based aluminum oxide composite coating with the thickness of 0.15mm, the surface hardness of the chromium-based aluminum oxide composite coating is 952HV, the content of aluminum oxide particles in the chromium-based aluminum oxide composite coating is 0.5-6.0 wt%, and the particle diameter of the particles is 0.1-5.0 mm; the thickness of the aluminum bronze coating 3 is 0.5mm.
The manufacturing process of the rectangular piston ring for the two-stroke ship in the embodiment 1 comprises the following steps:
s1, providing a piston ring substrate 1 made of vermicular graphite cast iron, electroplating a chromium layer on the outer circular surface 1-1 of the piston ring substrate 1, embedding alumina particles in the chromium layer, repeating the processes of electroplating the chromium layer and embedding the alumina particles until the thickness of the composite coating reaches the requirement, finally forming a chromium-based alumina composite coating 2 with the thickness of 0.15mm, and carrying out post-processing and conventional drying on the coating for later use;
s2, cleaning the piston ring matrix 1 by adopting ultrasonic and degreasing agents, removing oil stains on the ring body, and coating and shielding parts of the piston ring matrix 1 except for the chromium-based composite coating 2 (corresponding to the outer circular surface 1-1) after cleaning, and keeping the outer circular surface flat; then carrying out sand blasting treatment on the surface of the chromium-based composite coating 2; wherein: the sand blasting pressure is 0.45MPa, the sand blasting medium is 20# white corundum, the distance between a nozzle and the outer circular surface 1-1 of a piston ring is 60mm, and the roughness Rz 5-Rz 8 of the surface of the chromium-based composite coating 2 is realized after sand blasting;
s3, separating the ring from the end face 1-2 of the ring by using a gasket with the thickness of 1-3 mm, ensuring the outer circular surface 1-1 of the piston ring to be flat, and then spraying an aluminum bronze coating 3 with the thickness of 0.5mm on the chromium-based aluminum oxide composite coating 2 by adopting an electric arc or plasma spraying process; wherein: the gasket is used for separating the end faces 1-2 of adjacent piston ring matrixes when the piston rings are manufactured in batches, so that the sticking between the piston rings in the spraying process is prevented, the phenomenon that the coating is peeled off due to the sticking of the end face coating after the piston rings are sprayed is eliminated, the qualification rate is improved by more than 50%, and the gasket is convenient to use and is suitable for mass production;
and S4, performing coating quality inspection after finishing the spraying in the step S3, and performing micro-polishing treatment on the aluminum bronze coating 3 to obtain the piston ring with the rectangular structure for the two-stroke ship.
The alumina ceramic content was checked using an X-ray fluorescence spectrometer, with an aluminum content of 3.0wt%.
Friction and wear test: compared with the existing single-layer aluminum bronze coating piston ring, the abrasion loss of the piston ring prepared by the invention is reduced by more than 40%.
Example 2
As shown in fig. 1 and 3, there is provided a symmetrical barrel surface piston ring for a two-stroke ship, the piston ring comprising: a piston ring matrix 1 made of cast steel, a chromium-based composite coating 2 and an aluminum bronze coating 3;
the piston ring substrate 1 is provided with an outer circular surface 1-1 and a piston ring substrate end surface 1-2; the chromium-based composite plating layer 2 and the aluminum bronze coating 3 are sequentially laminated on the outer circular surface 1-1;
wherein: the chromium-based composite coating 2 is formed by compounding 5-20 layers of units, the chromium-based composite coating 2 is a chromium-based silicon nitride composite coating with the thickness of 0.20mm, the surface hardness of the chromium-based silicon nitride composite coating is 956HV, the content of silicon nitride particles in the chromium-based silicon nitride composite coating is 1.0-4.0 wt%, and the particle size of the particles is 0.5-5.0 mm; the thickness of the aluminum bronze coating 3 is 0.3mm.
The manufacturing process of the symmetrical barrel surface piston ring for the two-stroke ship in the embodiment 2 comprises the following specific steps:
s1, providing a piston ring substrate 1 made of cast steel, electroplating a chromium layer on the outer circular surface 1-1 of the piston ring substrate 1, embedding silicon nitride particles in the chromium layer, repeating the processes of electroplating the chromium layer and embedding the silicon nitride particles until the thickness of a composite coating reaches the requirement, finally forming a chromium-based silicon nitride composite coating 2 with the thickness of 0.20mm, and carrying out post-processing and conventional drying on the coating for later use;
s2, cleaning the piston ring substrate 1 by adopting ultrasonic and degreasing agents, removing oil stains on the ring body, and coating and shielding the parts of the piston ring substrate 1 except the chromium-based silicon nitride composite coating 2 (corresponding to the outer circular surface 1-1) and keeping the outer circular surface flat after cleaning; then carrying out sand blasting treatment on the surface of the chromium-based silicon nitride composite coating 2; wherein: the sand blasting pressure is 0.5MPa, the sand blasting medium is 20# white corundum, the distance between a nozzle and the outer circular surface 1-1 of a piston ring is 40mm, and the roughness Rz 5-Rz 8 of the surface of the chromium-based composite coating 2 after sand blasting is carried out;
s3, separating the ring from the end face 1-2 of the ring by using a gasket with the thickness of 1-3 mm, ensuring the outer circular surface 1-1 of the piston ring to be flat, and then spraying an aluminum bronze coating 3 with the thickness of 0.3mm on the chromium-based silicon nitride composite coating 2 by adopting an electric arc or plasma spraying process; wherein: the gasket is used for separating the end faces 1-2 of adjacent piston ring matrixes when the piston rings are manufactured in batches, so that the sticking between the piston rings in the spraying process is prevented, the phenomenon that the coating is peeled off due to the sticking of the end face coating after the piston rings are sprayed is eliminated, the qualification rate is improved by more than 50%, and the gasket is convenient to use and is suitable for mass production;
and S4, performing coating quality inspection after finishing the spraying in the step S3, and performing micro-polishing treatment on the aluminum bronze coating 3 to obtain the piston ring with the symmetrical barrel surface structure for the two-stroke ship.
The silicon nitride ceramic content was checked using an X-ray fluorescence spectrometer for a silicon content of 2.6wt%.
Friction and wear test: compared with the existing single-layer aluminum bronze coating piston ring, the abrasion loss of the piston ring prepared by the invention is reduced by more than 50%.
Example 3
As shown in fig. 1 and 4, there is provided a piston ring for a two-stroke ship, the piston ring comprising: a steel piston ring matrix 1, a chromium-based composite coating 2 and an aluminum bronze coating 3;
the piston ring substrate 1 is provided with an outer circular surface 1-1 and a piston ring substrate end surface 1-2; the chromium-based composite plating layer 2 and the aluminum bronze coating 3 are sequentially laminated on the outer circular surface 1-1;
wherein: the chromium-based composite coating 2 is formed by compounding 5-20 layers of units, the chromium-based composite coating 2 is a chromium-based diamond composite coating with the thickness of 0.10mm, the surface hardness of the chromium-based diamond composite coating is 976HV, the content of diamond particles in the chromium-based diamond composite coating is 0.5-3.0 wt%, and the particle diameter of the particles is 0.1-2.0 mm; the thickness of the aluminum bronze coating 3 is 0.3mm.
The manufacturing process of the asymmetric barrel surface piston ring for the two-stroke ship in the embodiment 3 comprises the following specific steps:
s1, providing a piston ring substrate 1 made of cast steel, electroplating a chromium layer on the outer circular surface 1-1 of the piston ring substrate 1, then embedding diamond particles in the chromium layer, repeating the processes of electroplating the chromium layer and embedding the diamond particles until the thickness of the composite coating reaches the requirement, finally forming a chromium-based diamond composite coating 2 with the thickness of 0.10mm, and processing the coating and drying the coating conventionally for later use;
s2, cleaning the piston ring matrix 1 by adopting ultrasonic and degreasing agents, removing oil stains on the ring body, and coating and shielding parts of the piston ring matrix 1 except for the chromium-based diamond composite coating 2 (corresponding to the outer circular surface 1-1) after cleaning, so as to keep the outer circular surface smooth; then carrying out sand blasting treatment on the surface of the chromium-based diamond composite coating 2; wherein: the sand blasting pressure is 0.55MPa, the sand blasting medium is 20# white corundum, the distance between a nozzle and the outer circular surface 1-1 of a piston ring is 50mm, and the roughness Rz 5-Rz 8 of the surface of the chromium-based composite coating 2 after sand blasting is carried out;
s3, separating the ring from the end face 1-2 of the ring by using a gasket with the thickness of 1-3 mm, ensuring the outer circular surface 1-1 of the piston ring to be flat, and then spraying an aluminum bronze coating 3 with the thickness of 0.3mm on the chromium-based diamond composite coating 2 by adopting an electric arc or plasma spraying process; wherein: the gasket is used for separating the end faces 1-2 of adjacent piston ring matrixes when the piston rings are manufactured in batches, so that the sticking between the piston rings in the spraying process is prevented, the phenomenon that the coating is peeled off due to the sticking of the end face coating after the piston rings are sprayed is eliminated, the qualification rate is improved by more than 50%, and the gasket is convenient to use and is suitable for mass production;
and S4, performing coating quality inspection after finishing the spraying in the step S3, and performing micro-polishing treatment on the aluminum bronze coating 3 to obtain the piston ring with the asymmetric barrel surface structure for the two-stroke ship.
The diamond particle content was checked using an X-ray fluorescence spectrometer and the diamond content was 2.0wt%.
Friction and wear test: compared with the existing single-layer aluminum bronze coating piston ring, the abrasion loss of the piston ring prepared by the invention is reduced by more than 60%.
Example 4
As shown in fig. 1 and 5, there is provided a conical piston ring for a two-stroke ship, the piston ring comprising: a piston ring matrix 1 made of spheroidal graphite cast iron, a chromium-based composite coating 2 and an aluminum bronze coating 3;
the piston ring substrate 1 is provided with an outer circular surface 1-1 and a piston ring substrate end surface 1-2; the chromium-based composite plating layer 2 and the aluminum bronze coating 3 are sequentially laminated on the outer circular surface 1-1;
wherein: the chromium-based composite coating 2 is formed by compounding 5-20 layers of units, the chromium-based composite coating 2 is a chromium-based diamond composite coating with the thickness of 0.08mm, the surface hardness of the chromium-based diamond composite coating is 965HV, the content of diamond particles in the chromium-based diamond composite coating is 0.5-3.0 wt%, and the particle diameter of the particles is 0.1-2.0 mm; the thickness of the aluminum bronze coating 3 is 0.3mm.
The manufacturing process of the conical piston ring for the two-stroke ship in the embodiment 4 comprises the following steps:
s1, providing a piston ring substrate 1 made of spheroidal graphite cast iron, electroplating a chromium layer on the outer circular surface 1-1 of the piston ring substrate 1, then embedding diamond particles in the chromium layer, repeating the processes of electroplating the chromium layer and embedding the diamond particles until the thickness of the composite coating reaches the requirement, finally forming a chromium-based diamond composite coating 2 with the thickness of 0.08mm, and carrying out post-processing and conventional drying on the coating for later use;
s2, cleaning the piston ring matrix 1 by adopting ultrasonic and degreasing agents, removing oil stains on the ring body, and coating and shielding parts of the piston ring matrix 1 except for the chromium-based diamond composite coating 2 (corresponding to the outer circular surface 1-1) after cleaning, so as to keep the outer circular surface smooth; then carrying out sand blasting treatment on the surface of the chromium-based diamond composite coating 2; wherein: the sand blasting pressure is 0.55MPa, the sand blasting medium is 20# white corundum, the distance between a nozzle and the outer circular surface 1-1 of a piston ring is 45mm, and the roughness Rz 5-Rz 8 of the surface of the chromium-based composite coating 2 after sand blasting is performed;
s3, separating the ring from the end face 1-2 of the ring by using a gasket with the thickness of 1-3 mm, ensuring the outer circular surface 1-1 of the piston ring to be flat, and then spraying an aluminum bronze coating 3 with the thickness of 0.3mm on the chromium-based diamond composite coating 2 by adopting an electric arc or plasma spraying process; wherein: the gasket is used for separating the end faces 1-2 of adjacent piston ring matrixes when the piston rings are manufactured in batches, so that the sticking between the piston rings in the spraying process is prevented, the phenomenon that the coating is peeled off due to the sticking of the end face coating after the piston rings are sprayed is eliminated, the qualification rate is improved by more than 50%, and the gasket is convenient to use and is suitable for mass production;
s4, performing coating quality inspection after finishing the spraying of the step S3, and performing micro-polishing treatment on the aluminum bronze coating 3 to obtain the conical surface piston ring for the two-stroke ship.
The diamond particle content was checked using an X-ray fluorescence spectrometer and the diamond content was 2.0wt%.
Friction and wear test: compared with the existing single-layer aluminum bronze coating piston ring, the abrasion loss of the piston ring prepared by the invention is reduced by more than 60%.
The above-described preferred embodiments of the present invention are only for illustrating the present invention, and are not to be construed as limiting the present invention. Obvious changes and modifications of the invention, which are introduced by the technical solution of the present invention, are still within the scope of the present invention.
Claims (9)
1. A two-stroke marine piston ring, said piston ring comprising: a piston ring substrate (1), a chromium-based composite coating (2) and an aluminum bronze coating (3);
the piston ring base body (1) is provided with an outer circular surface (1-1); the chromium-based composite coating (2) and the aluminum bronze coating (3) are sequentially laminated on the outer circular surface (1-1);
the chromium-based composite coating (2) is formed by compositing 5-20 layers of units, and the chromium-based composite coating (2) is a chromium-based ceramic composite coating or a chromium-based diamond composite coating;
the chromium-based composite coating (2) is used for improving the long-term wear resistance, high temperature resistance and corrosion resistance of the piston ring; the aluminum bronze coating (3) is used for improving the antifriction property and fretting wear resistance of the piston ring.
2. A two-stroke piston ring for a ship according to claim 1, characterized in that the material of the piston ring base body (1) is selected from one of spheroidal graphite cast iron, vermicular graphite cast iron, alloy cast iron, steel, cast steel.
3. The piston ring for a two-stroke ship according to claim 1, wherein the thickness of the chromium-based ceramic composite coating is 0.15-0.30 mm;
the ceramic material in the chromium-based ceramic composite coating is selected from one of aluminum oxide, silicon nitride, boron nitride, silicon carbide and boron carbide.
4. The piston ring for a two-stroke ship according to claim 1, wherein the thickness of the chromium-based diamond composite coating is 0.05-0.20 mm; the grain diameter of diamond particles in the chromium-based diamond composite coating is 0.1-2.0 mu m.
5. A two-stroke piston ring for a ship according to claim 1, characterized in that the thickness of the aluminium bronze coating (3) is 0.2-0.6 mm.
6. A two-stroke marine piston ring according to claim 1, characterized in that the porosity of the aluminium bronze coating (3) is 2-5%, the oxide content in the aluminium bronze coating (3) is 13-18 wt%, and the hardness of the aluminium bronze coating (3) is 90-120HV.
7. A process for manufacturing a piston ring for a two-stroke vessel according to any one of claims 1 to 6, comprising the steps of:
s1, providing a piston ring substrate (1), electroplating a chromium layer on the outer circular surface (1-1) of the piston ring substrate (1), then embedding ceramic materials or diamond particles in the chromium layer, and repeating the processes of electroplating the chromium layer and embedding the ceramic materials or diamond particles until the composite plating layer reaches the thickness requirement to form the chromium-based composite plating layer (2);
s2, cleaning the piston ring substrate (1), coating and shielding the parts of the piston ring substrate (1) except the chromium-based composite coating (2), and then carrying out sand blasting on the surface of the chromium-based composite coating (2);
s3, after sand blasting, adopting an electric arc or plasma spraying process to spray and form the aluminum bronze coating (3) on the chromium-based composite coating (2);
and S4, performing micro-polishing treatment on the aluminum bronze coating (3) to obtain the two-stroke marine piston ring.
8. The manufacturing process of the two-stroke marine piston ring according to claim 7, wherein the step S2 is to clean the piston ring substrate (1) by using ultrasonic and degreasing agents to remove oil stains on the ring body; after cleaning, coating and shielding the parts of the piston ring substrate (1) except the chromium-based composite coating (2), and then carrying out sand blasting on the surface of the chromium-based composite coating (2); wherein: the sand blasting pressure is 0.4-0.6 MPa, the sand blasting medium is 20-36 # white corundum, and the roughness of the surface of the chromium-based composite coating (2) after sand blasting is Rz 5-Rz 8.
9. The manufacturing process of the two-stroke marine piston ring according to claim 7, wherein after the step S3, sand blasting, the piston ring substrate (1) is placed on a gasket, and then the aluminum bronze coating (3) is formed on the chromium-based composite coating (2) by spraying through an arc or plasma spraying process; the gasket is used to separate the end faces (1-2) of adjacent piston ring substrates when the piston rings are mass produced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310317377.9A CN116335844A (en) | 2023-03-29 | 2023-03-29 | Two-stroke marine piston ring and manufacturing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310317377.9A CN116335844A (en) | 2023-03-29 | 2023-03-29 | Two-stroke marine piston ring and manufacturing process thereof |
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| Publication Number | Publication Date |
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| CN116335844A true CN116335844A (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310317377.9A Pending CN116335844A (en) | 2023-03-29 | 2023-03-29 | Two-stroke marine piston ring and manufacturing process thereof |
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| Country | Link |
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| CN (1) | CN116335844A (en) |
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- 2023-03-29 CN CN202310317377.9A patent/CN116335844A/en active Pending
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