EP2659025A1 - Piston assembly for alernative compressor - Google Patents

Piston assembly for alernative compressor

Info

Publication number
EP2659025A1
EP2659025A1 EP11854223.2A EP11854223A EP2659025A1 EP 2659025 A1 EP2659025 A1 EP 2659025A1 EP 11854223 A EP11854223 A EP 11854223A EP 2659025 A1 EP2659025 A1 EP 2659025A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
cylinder assembly
amorphous carbon
dlc
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.)
Withdrawn
Application number
EP11854223.2A
Other languages
German (de)
French (fr)
Inventor
Márcio SILVÉRIO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Whirlpool SA
Original Assignee
Whirlpool SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Whirlpool SA filed Critical Whirlpool SA
Publication of EP2659025A1 publication Critical patent/EP2659025A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/26—Deposition of carbon only
    • C23C16/27—Diamond only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F05C2203/0804—Non-oxide ceramics
    • F05C2203/0808—Carbon, e.g. graphite
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F05C2203/0804—Non-oxide ceramics
    • F05C2203/083—Nitrides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • F05C2203/0804—Non-oxide ceramics
    • F05C2203/0856—Sulfides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2253/00—Other material characteristics; Treatment of material
    • F05C2253/12—Coating

Definitions

  • the " present invention refers to a piston/cylinder assembly for alternative compressors, and, more specifically, to a piston/cylinder assembly for linear compressors.
  • a compressor The function of a compressor is to elevate the pressure of determined volume of fluid to a pressure required to effect a refrigeration cycle.
  • the thus called alternative compressors, where a piston reciprocately slides inside a cylinder to carry out compression of gases, are known from the art.
  • a contact between a reciprocating piston and a cylinder can generate high mechanical losses, and may cause damage and premature failure in a compressor.
  • Such a contact between parts may increase noise, operational temperature, compressor vibration, and loss of effectiveness, thus also contributing to increase in equipment energy power consumption.
  • an object of the present invention relates to a piston/cylinder assembly for an alternative compressor, which provides lesser friction between the piston and cylinder, thus preventing premature wear of the parts.
  • the present invention achieves the objects mentioned above by providing a piston/cylinder assembly for an alternative compressor where said piston performs a reciprocating movement inside said cylinder, where piston surface and cylinder surface comprise a surface roughness with surface roughness parameter Rpk of less than about 60 and a surface roughness parameter Rvk of less than 100 nm; and the piston surface receives a coating comprising at least one support layer and at least one DLC layer (3).
  • the cylinder material comprises stainless steel
  • the support layer material is selected from nitrides and sulfides
  • the DLC layer material is selected from non-hydrogenated amorphous carbon, hydrogenated amorphous carbon, non-hydrogenated tetragonal amorphous carbon, and hydrogenated tetragonal amorphous carbon.
  • Said DLC layer may further comprise metal and non-metal alloy elements.
  • Figure 1 illustrates a schematic view of the coating of the piston/cylinder assembly in accordance with a preferred embodiment of the present invention.
  • Figure 2 illustrates a comparative graphic representation between the present invention and the solution of the state of the art.
  • Figure 3 illustrates a schematic representation of the coated surfaces of the piston/cylinder assembly in accordance with the preferred embodiment of the present invention.
  • the present invention provides for coating the outer surface of the piston with thin films of DLC in association with a base coating that increases the mechanical strength of the DLC coating applied to the surface.
  • the present invention comprises a piston 1 (only a portion of its outer surface is illustrated) which receives a coating preferably composed of a mechanical support layer 2 and a DLC layer 3.
  • the support layer 2 and support layer 3 generate a coating having a thickness of approximately 3-10 microns.
  • Said support layer 2 can comprise a single or multiple elements disposed in the following forms: gradually variable chemical composition, constant chemical composition, monolayer or multilayer.
  • composition of support layer 2 can vary in accordance with mechanical tensiles of a specific design of a piston/cylinder assembly, wherein said layer can comprise nitrides (CrN, FeN, TiN, ⁇ , CAITiN, etc.), sulfides (MoS 2 , and variations, WS 2 , and variations, etc.; and other coatings having intermediate hardness between the substrate and DLC in order to give mechanical support to high loads acting on the piston.
  • nitrides CrN, FeN, TiN, ⁇ , CAITiN, etc.
  • MoS 2 sulfides
  • WS 2 sulfides
  • DLC 3 layer same is composed of a carbon-based coating having variable proportions of hydrogen, and it may also contain the following variations: a- C:H (Non-Hydrogenated Amorphous Carbon); a-C:H (Hydrogenated Amorphous Carbon); ta- C (Non-Hydrogenate Tetragonal Amorphous Carbon); ta-C:H (Hydrogenated Tetragonal Amorphous Carbon).
  • addition of alloy elements can also be used to obtain specific properties for each application, wherein a layer with addition of alloy elements is designated Me-DCL, wherein Me refers to the (metal or non-metal) added elements.
  • the disposition of layer 3 can also comprise variations concerning the proportion of alloy elements, and can be, for example: a gradually variable chemical composition, a constant chemical composition, a monocompound, or DLC variations disposed in intercalated form.
  • DLC layer is carried out after preparing the piston surface that will receive said layer.
  • This preparation involves a surface finishing process so as to obtain a surface roughness with parameters Rpk ⁇ 60 nm and Rvk ⁇ 100 nm obtained by topographic measurement of the surfaces.
  • the cylinder surface is prepared so as to obtain a cylinder surface with surface roughness having parameters Rpk ⁇ 60 nm and Rvk ⁇ 100 nm achieved by topographical measurement of the surfaces.
  • Figure 2 schematically shows the wear of DLC layer on a surface without the roughness specified above ( Figures a) and b)) and with the roughness specified above ( Figures c) and d)).
  • DLC layers undergoes a premature wear due to the concentration of contact stresses in the surface harsh peaks (that is, they end up forming punctual support areas on the layer). Such a premature wear then leaves the piston substrate exposed.
  • said piston/cylinder assembly is made of stainless steel.
  • the use of a stainless steel cylinder allows for a tribolayer formation uniformly distributed at both contact interfaces due to the relative movement between the parts.
  • Said tribolayer is formed due to the elimination (by mild wear) of harsh peaks from the stainless steel of the cylinder and of DLC as well as residues of materials used in the remaining parts of the compressor and the atmosphere application thereof.
  • the formation of a longer lasting DLC coating by fabricating one of the parts of the piston/cylinder assembly ensures the formation of a tribolayer, which is essential for the functioning of the tribologic pair, allowing for the piston/cylinder assembly to function without significant wear, low friction and suitable durability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Compressor (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Chemical Vapour Deposition (AREA)

Abstract

The present invention refers to a piston/cylinder assembly for alternative compressor, wherein the piston performs a reciprocating movement inside the cylinder, wherein piston surface (1 ) and cylinder surface have a surface roughness parameter Rpk of less than about 60 nm and a surface roughness parameter Rvk of less than 100 nm; and said piston surface (1 ) receives a coating comprising at least a support layer 2 and at least a DLC layer (3).

Description

"PISTON ASSEMBLY FOR ALERNATIVE COMPRESSOR"
Field of the Invention
The" present invention refers to a piston/cylinder assembly for alternative compressors, and, more specifically, to a piston/cylinder assembly for linear compressors.
Background of the Invention
The function of a compressor is to elevate the pressure of determined volume of fluid to a pressure required to effect a refrigeration cycle. The thus called alternative compressors, where a piston reciprocately slides inside a cylinder to carry out compression of gases, are known from the art.
A contact between a reciprocating piston and a cylinder can generate high mechanical losses, and may cause damage and premature failure in a compressor.
Furthermore, such a contact between parts may increase noise, operational temperature, compressor vibration, and loss of effectiveness, thus also contributing to increase in equipment energy power consumption.
In some types of compressors, a lubricating oil between the moving parts is predicted; nevertheless, in some applications to linear compressors the presence of oil is deleterious.
In an attempt to solve this problem related to a piston/cylinder friction without using lubricating oil, some technical solutions have been developed for using special coatings in such parts.
This is, for example, the case of solutions disclosed in US Patent 6,641 ,337 and JP 2001107860, which refer to application of DLC (Diamond-like Carbon) to moving parts of a compressor.
However, even these already known solutions do not entirely solve the problem of stress contact and consequent wear between parts, since the concentration of contact stresses over harsh peaks of DLC ends up causing premature wear of the coating.
Objects of the Invention
Therefore, an object of the present invention relates to a piston/cylinder assembly for an alternative compressor, which provides lesser friction between the piston and cylinder, thus preventing premature wear of the parts.
Summary of the Invention
The present invention achieves the objects mentioned above by providing a piston/cylinder assembly for an alternative compressor where said piston performs a reciprocating movement inside said cylinder, where piston surface and cylinder surface comprise a surface roughness with surface roughness parameter Rpk of less than about 60 and a surface roughness parameter Rvk of less than 100 nm; and the piston surface receives a coating comprising at least one support layer and at least one DLC layer (3). In a preferred embodiment of the present invention, the cylinder material comprises stainless steel, the support layer material is selected from nitrides and sulfides, and the DLC layer material is selected from non-hydrogenated amorphous carbon, hydrogenated amorphous carbon, non-hydrogenated tetragonal amorphous carbon, and hydrogenated tetragonal amorphous carbon. Said DLC layer may further comprise metal and non-metal alloy elements.
Brief Description of the Drawings
Figure 1 illustrates a schematic view of the coating of the piston/cylinder assembly in accordance with a preferred embodiment of the present invention.
Figure 2 illustrates a comparative graphic representation between the present invention and the solution of the state of the art.
Figure 3 illustrates a schematic representation of the coated surfaces of the piston/cylinder assembly in accordance with the preferred embodiment of the present invention.
Detailed Description of the Invention
Next, the present invention will be described in more details based on execution examples represented by the appended drawings.
In order to ensure the correct functioning of the piston/cylinder assembly without affecting the effectiveness in function of wear and in the absence of lubrication by lubricating oil, the present invention provides for coating the outer surface of the piston with thin films of DLC in association with a base coating that increases the mechanical strength of the DLC coating applied to the surface.
Thus, as can be seen from Figure 1 , the present invention comprises a piston 1 (only a portion of its outer surface is illustrated) which receives a coating preferably composed of a mechanical support layer 2 and a DLC layer 3. In the preferred embodiment of the present invention, the support layer 2 and support layer 3 generate a coating having a thickness of approximately 3-10 microns.
Said support layer 2 can comprise a single or multiple elements disposed in the following forms: gradually variable chemical composition, constant chemical composition, monolayer or multilayer.
In addition, the composition of support layer 2 can vary in accordance with mechanical tensiles of a specific design of a piston/cylinder assembly, wherein said layer can comprise nitrides (CrN, FeN, TiN, ΑΙΤΊΝ, CAITiN, etc.), sulfides (MoS2, and variations, WS2, and variations, etc.; and other coatings having intermediate hardness between the substrate and DLC in order to give mechanical support to high loads acting on the piston.
With regard to the DLC 3 layer, same is composed of a carbon-based coating having variable proportions of hydrogen, and it may also contain the following variations: a- C:H (Non-Hydrogenated Amorphous Carbon); a-C:H (Hydrogenated Amorphous Carbon); ta- C (Non-Hydrogenate Tetragonal Amorphous Carbon); ta-C:H (Hydrogenated Tetragonal Amorphous Carbon). Besides these variations, addition of alloy elements can also be used to obtain specific properties for each application, wherein a layer with addition of alloy elements is designated Me-DCL, wherein Me refers to the (metal or non-metal) added elements.
The disposition of layer 3 can also comprise variations concerning the proportion of alloy elements, and can be, for example: a gradually variable chemical composition, a constant chemical composition, a monocompound, or DLC variations disposed in intercalated form.
Application of the DLC layer is carried out after preparing the piston surface that will receive said layer. This preparation involves a surface finishing process so as to obtain a surface roughness with parameters Rpk < 60 nm and Rvk< 100 nm obtained by topographic measurement of the surfaces.
To ensure the reduction of the friction on the piston/cylinder assembly, the cylinder surface is prepared so as to obtain a cylinder surface with surface roughness having parameters Rpk< 60 nm and Rvk< 100 nm achieved by topographical measurement of the surfaces.
In this sense, Figure 2 schematically shows the wear of DLC layer on a surface without the roughness specified above (Figures a) and b)) and with the roughness specified above (Figures c) and d)).
As can be seen from Figures a) and b), under high roughness condition, DLC layers undergoes a premature wear due to the concentration of contact stresses in the surface harsh peaks (that is, they end up forming punctual support areas on the layer). Such a premature wear then leaves the piston substrate exposed.
Nevertheless, when the roughness is within the parameters proposed by the present invention - such as shown in Figures c) and d), a gradual and mild wear on the DLC layer occurs due to the formation of a greater area of support between the surfaces resulting in the reduction of contact stresses.
In the preferred embodiment of the present invention, said piston/cylinder assembly is made of stainless steel.
As can be seen from Figure 3, the use of a stainless steel cylinder allows for a tribolayer formation uniformly distributed at both contact interfaces due to the relative movement between the parts. Said tribolayer is formed due to the elimination (by mild wear) of harsh peaks from the stainless steel of the cylinder and of DLC as well as residues of materials used in the remaining parts of the compressor and the atmosphere application thereof.
Therefore, the formation of a longer lasting DLC coating by fabricating one of the parts of the piston/cylinder assembly ensures the formation of a tribolayer, which is essential for the functioning of the tribologic pair, allowing for the piston/cylinder assembly to function without significant wear, low friction and suitable durability.
It should be construed that this description based on the figures above only refers to one of the possible embodiments of the object of the present invention, wherein the real scope of the object to be protected is defined by the appended claims.

Claims

1 . Piston/cylinder assembly for an alternative compressor wherein the piston performs a reciprocating movement inside the cylinder, characterized in that:
piston surface (1 ) and cylinder surface have a surface roughness parameter Rpk of less than about 60 nm and a surface roughness parameter Rvk of less than 100 nm;
said piston surface (1 ) receives a coating comprising at least a support layer 2 and at least a DLC layer (3).
2. Piston/cylinder assembly, in accordance with claim 1 , characterized in that the cylinder material is stainless steel.
3. Piston/cylinder assembly, in accordance with claim 1 or 2, characterized in that the material of said support layer (2) is selected from nitrides and sulfides.
4. Piston/cylinder assembly, in accordance with claim 1 , 2, or 3, characterized in that the material of said DLC layer (3) is selected from non-hydrogenated amorphous carbon, hydrogenated amorphous carbon, non-hydrogenated tetragonal amorphous carbon, and hydrogenated tetragonal amorphous carbon, or a combination thereof.
5. Piston/cylinder assembly, in accordance with claim 4, characterized in that said DLC layer (3) further comprises metal or non-metal alloy elements.
EP11854223.2A 2010-12-27 2011-12-08 Piston assembly for alernative compressor Withdrawn EP2659025A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRPI1009955-7A BRPI1009955A2 (en) 2010-12-27 2010-12-27 piston - reciprocating compressor cylinder assembly
PCT/BR2011/000460 WO2012088571A1 (en) 2010-12-27 2011-12-08 Piston assembly for alernative compressor

Publications (1)

Publication Number Publication Date
EP2659025A1 true EP2659025A1 (en) 2013-11-06

Family

ID=46382111

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11854223.2A Withdrawn EP2659025A1 (en) 2010-12-27 2011-12-08 Piston assembly for alernative compressor

Country Status (9)

Country Link
EP (1) EP2659025A1 (en)
JP (1) JP2014502691A (en)
KR (1) KR20140067961A (en)
CN (1) CN103298972B (en)
AR (1) AR084603A1 (en)
BR (1) BRPI1009955A2 (en)
SG (1) SG191408A1 (en)
TW (1) TWI461605B (en)
WO (1) WO2012088571A1 (en)

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TWI461605B (en) 2014-11-21
AR084603A1 (en) 2013-05-29
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WO2012088571A1 (en) 2012-07-05
JP2014502691A (en) 2014-02-03
CN103298972B (en) 2016-12-21
KR20140067961A (en) 2014-06-05
TW201235566A (en) 2012-09-01
BRPI1009955A2 (en) 2013-06-11
SG191408A1 (en) 2013-08-30

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