CN112555409B - Low-friction diamond-like coating piston ring with texture structure and preparation method thereof - Google Patents
Low-friction diamond-like coating piston ring with texture structure and preparation method thereof Download PDFInfo
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- CN112555409B CN112555409B CN202011314313.6A CN202011314313A CN112555409B CN 112555409 B CN112555409 B CN 112555409B CN 202011314313 A CN202011314313 A CN 202011314313A CN 112555409 B CN112555409 B CN 112555409B
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- 238000000576 coating method Methods 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000000758 substrate Substances 0.000 claims abstract description 37
- 230000007704 transition Effects 0.000 claims abstract description 21
- 238000000151 deposition Methods 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 230000008021 deposition Effects 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 7
- 239000004215 Carbon black (E152) Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- 150000002430 hydrocarbons Chemical class 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000011651 chromium Substances 0.000 claims description 4
- 239000010936 titanium Substances 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 238000005240 physical vapour deposition Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims 2
- SJKRCWUQJZIWQB-UHFFFAOYSA-N azane;chromium Chemical compound N.[Cr] SJKRCWUQJZIWQB-UHFFFAOYSA-N 0.000 claims 1
- 229910002092 carbon dioxide Inorganic materials 0.000 claims 1
- 239000001569 carbon dioxide Substances 0.000 claims 1
- 238000000746 purification Methods 0.000 claims 1
- 239000010687 lubricating oil Substances 0.000 description 9
- 239000003921 oil Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000010705 motor oil Substances 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000013537 hard-soft composite Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Classifications
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- 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
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
-
- 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
- C23C14/02—Pretreatment of the material to be coated
- C23C14/024—Deposition of sublayers, e.g. to promote adhesion of the coating
-
- 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
- C23C14/02—Pretreatment of the material to be coated
- C23C14/028—Physical treatment to alter the texture of the substrate surface, e.g. grinding, polishing
-
- 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
- C23C14/0605—Carbon
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- 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
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/12—Details
-
- 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
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/12—Details
- F16J9/20—Rings with special cross-section; Oil-scraping rings
-
- 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
- F16N—LUBRICATING
- F16N1/00—Constructional modifications of parts of machines or apparatus for the purpose of lubrication
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Chemical Vapour Deposition (AREA)
Abstract
The invention discloses a low-friction diamond-like coating piston ring with a texture structure and a preparation method thereof, wherein the piston ring comprises a piston ring substrate, and the outer circle surface of the piston ring substrate is a barrel surface or a partial barrel surface; two rows of texture micro-pits which are arranged on two sides of the top point of the barrel surface of the outer circular surface are mutually parallel, and the positions of the upper row and the lower row of the texture micro-pits are mutually staggered; the transition layer and the diamond-like coating are sequentially arranged on the texture micro-pits and the surface of the outer circular surface; a contact band formed at the apex of the diamond-like coating that continuously encircles the piston ring. The invention directly carries out texturing treatment on the outer circle surface of the piston ring substrate, so that a too thick hard wear-resistant layer is not needed, the coating cost is greatly reduced, and meanwhile, the hard wear-resistant layer adopts a diamond-like coating, so that the piston ring has the characteristics of low friction and high wear resistance under the condition of a thinner hard wear-resistant layer, the wear of the piston ring is further reduced, and the friction power loss of an engine is reduced.
Description
Technical Field
The invention relates to the field of engine parts, in particular to a low-friction diamond-like coating piston ring with a texture structure and a preparation method thereof.
Background
In order to improve the energy-saving and emission-reducing performance of automobiles and meet the emission regulations of more than six countries and the high requirements of automobile fuel economy indexes, automobile engine manufacturers adopt an engine oil long-change mode, a low-viscosity engine oil design scheme and the like during engine development. The problems of poor oil and lubrication of the piston ring, friction wear of the piston ring and cylinder scuffing are easy to occur in the working process of the engine.
In the application publication No. CN201310021922.6, a wear-resistant piston ring with a hard-soft composite coating and a textured surface is disclosed, which improves the problems of lean lubrication and cylinder scuffing of the piston ring to some extent by depositing a hard coating on the outer circumferential surface of the piston ring, then carrying out texturing on the hard coating, and finally preparing a soft coating on the textured surface, but still has the following problems: 1) Because the texture is established on the hard coating (the micropore depth of the texture is 6 to 55 mu m), the hard coating must be very thick, so that the cost of the hard coating is high, and the difficulty in realizing a thick film of the diamond-like coating of the piston ring is very high at present, so that the texture of the patent cannot be realized on the diamond-like coating; 2) The texture in this patent is to cover the whole outer circular surface of the piston ring, because the outer circular surface of the piston ring is a barrel surface mechanism, the position contacting with the cylinder wall is a barrel surface high point, and the upper end of the barrel surface of the outer circular surface is not contacted, once the texture is formed, the lubricating oil residue can be caused, and the lubricating oil can be carbonized quickly after being acted by high temperature of fuel gas. The oil consumption of the engine is affected and the carbonized particles form abrasive wear.
Disclosure of Invention
The invention aims to provide a low-friction diamond-like coating piston ring with a texture structure and a preparation method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a low-friction diamond-like coating piston ring with a texture structure and a preparation method thereof comprise the following steps:
the piston ring comprises a piston ring substrate, wherein the excircle surface of the piston ring substrate is a barrel surface, and the barrel surface is a front barrel surface or a partial barrel surface;
two rows of texture micro-pits which are arranged on two sides of the top point of the barrel surface of the outer circular surface are mutually parallel, and the positions of the upper row and the lower row of the texture micro-pits are mutually staggered;
the transition layer and the diamond-like coating are sequentially arranged on the texture micro-pits and the surface of the outer circular surface;
a contact band formed at the apex of the diamond-like coating that continuously encircles the piston ring.
As a further scheme of the invention: the surface of the outer circle is 3-40 μm.
As a further scheme of the invention: the texture micro-pits are spherical, the diameter of the texture micro-pits is 10-100 mu m, the depth of the texture micro-pits is 5-20 mu m, and the space between the texture micro-pits is 3-5 times of the diameter of the texture micro-pits.
As a further scheme of the invention: the thickness of the diamond-like coating is 3-25 μm, and the thickness of the transition layer is 2% -10% of the thickness of the diamond-like coating.
As a further scheme of the invention: the transition layer is one or a combination of chromium, titanium, chromium nitride and titanium nitride.
The preparation method of the low-friction diamond-like coating piston ring with the texture structure comprises the following steps:
s1: processing the raw material to form a piston ring body, grinding and honing the outer circular surface of the piston ring body to form a barrel surface structure, and forming a honing contact belt to obtain a piston ring substrate;
s2: the surface of the piston ring substrate is purified through ultrasonic cleaning or hydrocarbon cleaning;
s3: texturing the contact zone formed on the outer circular surface of the piston ring substrate by using pulse laser to form two parallel rows of mutually staggered textured micro pits;
s4: grinding and polishing the outer circular surface and cleaning and purifying the outer circular surface by using hydrocarbon;
s5: clamping the piston ring substrate, depositing a transition layer on the outer circumferential surface of the piston ring substrate and the surface of the texture micro-pit by using a physical vapor deposition coating furnace, and then depositing a diamond-like coating;
s6: and grinding and polishing the surface of the piston ring substrate to obtain a finished product.
As a further scheme of the invention: in the step S1 of the preparation method, when the raw material is a cast iron material, a piston ring body is formed through casting, heat treatment, sheet cutting and profiling; when the raw material is steel, the piston ring body is formed by ring winding, cutting and heat treatment.
As a further scheme of the invention: in the step S3, the texturing conditions of the pulsed laser are as follows: UV laser or CO2 laser is adopted, the pulse width is 8-14 mu s, the frequency is 20-65 KHZ, the beam diameter is 10-100 mu m, and the imprinting speed is 100-180 mm/s.
As a further scheme of the invention: in the step S5, the coating conditions of the transition layer are as follows: vacuum degree of furnace body 5X 10 - 5 torr, process temperature 100-150 ℃, bias voltage 600-1000V, current 80-130 mA, and deposition time 1-3 hours.
As a further scheme of the invention: in the step S5, the coating conditions of the diamond-like coating are as follows: vacuum degree of furnace body 3X 10 -6 torr, the process temperature is 100-120 ℃, the bias voltage is 600-800V, the current is 100-150 mA, and the deposition time is 5-25 hours.
Compared with the prior art, the invention has the beneficial effects that: (1) The texture micro-pits can enhance the fluid dynamic pressure effect of lubricating oil, can be used as a lubricant storage pool and collect abrasive dust particles, and improve the wear condition of a piston ring, and meanwhile, the structural layout design of the texture micro-pits solves the problem of lubricating oil residue in redundant texture micro-holes at non-contact positions, reduces the degradation and carbon deposition of the lubricating oil, and reduces the oil consumption; (2) According to the invention, the upper row and the lower row of mutually staggered texture micro-pit positions are arranged, so that the problem that once the top point of the barrel surface of the piston ring is worn, an air leakage channel and an oil leakage channel are easily formed when the upper hole and the lower hole are on the same axial line of the piston ring is solved; (3) According to the invention, the outer circle surface of the piston ring substrate is directly subjected to texturing treatment, so that a too thick hard wear-resistant layer is not required, the coating cost is greatly reduced, and meanwhile, the hard wear-resistant layer adopts a diamond-like coating, so that the piston ring substrate has the characteristics of low friction and high wear resistance under the condition of a thinner hard wear-resistant layer, the wear of the piston ring is further reduced, and the friction power loss of an engine is reduced; (4) The transition layer can form a rugged micro roughened surface on the surface of the piston ring, so that the bonding area of the diamond-like coating and the surface of the piston ring is increased, and the bonding strength is improved; (5) The continuous contact zone surrounding the outer circular surface guarantees the roundness of the piston ring on one hand, and realizes high fitting performance with the cylinder wall on the other hand, thereby achieving better sealing effect.
Drawings
FIG. 1 is a schematic view of a piston ring according to the present invention
FIG. 2 is a schematic cross-sectional view of a piston ring with a front barrel face;
fig. 3 is a schematic cross-sectional view of a piston ring with a barrel-off face.
In the figure: 1-piston ring substrate, 11-excircle surface, 111-contact zone, 2-texture micro-pit, 3-transition layer and 4-diamond-like coating.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, a low-friction diamond-like coating piston ring with a textured structure includes a piston ring substrate 1, wherein an outer circumferential surface 11 of the piston ring substrate is a barrel surface, which may be a front barrel surface or a partial barrel surface; two rows of texture micro-pits 2 which are arranged on two sides of the top point of the barrel surface of the outer circular surface 11 are mutually parallel, and the positions of the two rows of the texture micro-pits 2 are mutually staggered; the transition layer 3 and the diamond-like coating 4 are sequentially arranged on the surfaces of the texture micro-pits 2 and the outer circular surface 11; a contact band 111 disposed at the apex of the barrel face of the diamond-like coating 4 continuously encircling the piston ring.
Specifically, referring to fig. 2 and 3, one side of the piston ring substrate 1, which is in contact with the cylinder liner wall, is an outer circular surface 11, the outer circular surface 11 of the piston ring substrate is a positive barrel surface or a partial barrel surface, the barrel surface degree of the outer circular surface 11 is 3 to 40 μm, and a continuous contact band 111 surrounding the outer circular surface is formed by the barrel surface structure of the outer circular surface, so that on one hand, the contact band 111 ensures the roundness of the piston ring, realizes high adhesion with the cylinder wall, and achieves a better sealing effect, and on the other hand, the contact band 111 facilitates the identification of the high point position of the barrel surface, and facilitates the processing of the textured micro-pit 2.
Specifically, referring to fig. 1 and 2, the texture micro-pits 2 are spherical, and are directly arranged in two parallel rows of texture micro-pit rows on two sides of the top of the barrel surface of the outer circular surface 11, and the positions of the two rows of the texture micro-pits 2 are staggered with each other, so that a hard wear-resistant layer with too large thickness is not required, and the coating cost is greatly reduced, the texture micro-pits 2 are arranged in two parallel rows, and the two rows of the texture micro-pits 2 are not mutually corresponding up and down, but are staggered with each other up and down, so that the problem that the top of the barrel surface of the piston ring substrate 1 is easily subjected to air leakage and oil leakage channels after the two rows of the texture micro-pits 2 are arranged on the same axial line of the piston ring substrate 1, the texture micro-pits have the diameter of 10 to 100 μm and the depth of 5 to 20 μm, the space of the texture micro-pits is 3 to 5 times of the diameter of the texture micro-pits, the texture micro-pits 2 can enhance the hydrodynamic effect of the lubricating oil, can be used as a reservoir of a lubricating oil and can collect abrasive dust particles, the wear condition of the piston ring is improved, and the invention solves the problem that the residual lubricating oil consumption of the micro-pits in the non-contact layout of the micro-pit layout, and reduces the residual lubricating oil.
Specifically, the diamond-like coating 4 is arranged on the upper surface of the transition layer 3, the thickness of the diamond-like coating 4 is 3-25 μm, and the diamond-like coating 4 has the characteristics of low friction and high wear resistance under the condition of a thin hard wear-resistant layer, so that the wear of a piston ring is further reduced, and the friction power loss of an engine is reduced; the thickness of the transition layer 3 is 2% -10% of the thickness of the diamond-like coating, the transition layer 3 is one or a combination of chromium, titanium, chromium nitride and titanium nitride, on one hand, the transition layer 3 improves the bonding strength of the diamond-like coating 4 by forming a hardness gradient, the hardness of the piston ring substrate 1 is very low, the hardness of the diamond-like coating 4 is high at about 400HV, the hardness of the diamond-like coating 4 is over 1800HV, the transition layer 3 can achieve the hardness range of 600-1400 HV, on the other hand, the bonding strength of the diamond-like coating 4 is improved by improving the surface activity of the piston ring substrate 1, the surface of the piston ring substrate 1 is very compact and smooth after grinding and polishing, the transition layer 3 formed by one or a combination of chromium, titanium, chromium nitride and titanium nitride can form a rugged micro-roughened surface on the surface of the piston ring substrate 1, the bonding area of the diamond-like coating 4 is increased, and the bonding strength is improved.
The preparation method of the low-friction diamond-like coating piston ring with the texture structure comprises the following steps:
s1: the piston ring body is formed by casting, heat treatment, slicing and profiling the raw material of cast iron, the piston ring body is formed by ring winding, cutting and heat treatment of the raw material of steel, then the outer circle surface of the piston ring substrate is subjected to forming grinding and honing to form a barrel surface structure, and a honing contact belt is formed to obtain the piston ring substrate;
s2: the surface of the piston ring substrate is purified through ultrasonic cleaning or hydrocarbon cleaning;
s3: adopting UV laser or CO2 laser, wherein the pulse width is 8-14 mu s, the frequency is 20-65 KHZ, the beam diameter is 10-100 mu m, and the pulse laser with the imprinting speed of 100-180 mm/s is used for carrying out texturing treatment on a contact zone formed on the outer circular surface of the piston ring to form two rows of parallel texture micro-pits which are mutually staggered;
s4: grinding and polishing the outer circular surface and cleaning and purifying the outer circular surface by using hydrocarbon;
s5: clamping piston ring, and coating with PVD coating furnace at vacuum degree of 5 × 10 -5 At the condition of 100-150 deg.c technological temperature, 600-1000V bias voltage, 80-130 mA current and 1-3 hr deposition time, one transition layer is first deposited on the outer circular surface of piston ring base body and the surface of textured micro pit, and the vacuum degree of furnace body is 3 x 10 -6 torr, the process temperature is 100-120 ℃, the bias voltage is 600-800V, the current is 100-150 mA, and a diamond-like coating is deposited on the surface of the transition layer under the condition of 5-25 hours of deposition time;
s6: and grinding, cutting and polishing the surface of the piston ring substrate to obtain a finished product.
Example 1
Example 1 a piston ring having the following dimensions was prepared using the above preparation method: the ring height of the piston ring substrate 1 is 1.2mm, the radial thickness is 2.5mm, the barrel surface degree of the external circular surface 11 is 5 mu m, two texture micro-pit rows with 2 arrangement texture micro-pits are arranged at the barrel surface high point and are parallel to each other, but the texture micro-pits in the two rows are staggered up and down, the diameter of the texture micro-pits 2 is 10 mu m, the depth is 5 mu m, the 2-pitch of the texture micro-pits is 30 mu m, and the thickness of the diamond-like coating is 4 mu m. Through engine bench 400h endurance test, compare with the same size tradition piston ring: the engine oil consumption of the engine is reduced by 8.9%, the friction work of the engine is reduced by 1.8%, and the abrasion loss of a piston ring is reduced by 49%.
Example 2
Example 2 the same manufacturing method as in example 1 was used, except that the dimensions of the piston ring were different, and example 2 gave a piston ring of the following dimensions: the ring height of the piston ring substrate 1 is 3.2 mm, the radial thickness is 4.7 mm, the barrel surface degree of the external circular surface 11 is 38 μm, the barrel surface high point is provided with 2-arrangement texture micro-pits 2, the two texture micro-pit rows are parallel to each other, but the texture micro-pits in the two rows are staggered up and down, the diameter of the texture micro-pits 2 is 100 μm, the depth is 20 μm, the 2-interval of the texture micro-pits is 450 μm, and the thickness of the diamond-like coating 4 is 20 μm. Through the 1000h endurance test of the engine, compare with the same size traditional piston ring: the engine oil consumption of the engine is reduced by 12.1%, the friction work of the engine is reduced by 2.1%, and the abrasion loss of a piston ring is reduced by 53%.
Comparative example 1
The ring height and the radial thickness of the piston ring substrate 1 of the comparative example, the barrel surface degree of the outer circular surface 11, the diameter, the depth and the interval of the texture micro-pits 2 and the thickness of the diamond-like coating 4 are the same as those of the embodiment 1, the difference between the comparative example and the embodiment 1 is that the position arrangement of the texture micro-pits 2 is different, 2 arrangement texture micro-pits 2 are arranged at the barrel surface high point of the comparative example, two texture micro-pit rows are parallel to each other, and the texture micro-pits in the two rows are corresponding to each other up and down. Through engine bench 400h endurance test, compare with the same size tradition piston ring: the engine oil consumption of the engine is reduced by 4.9%, the friction work of the engine is reduced by 1.3%, and the abrasion loss of a piston ring is reduced by 45%.
The invention has novel structure and stable operation, and can be seen from the embodiment 1 and the comparative example 1 that the oil consumption of the texture micro-pit 2 with the staggered design is lower, and the embodiments 1 and 2 can see that the invention can realize the aim of greatly reducing the friction work of an engine and the abrasion loss of a piston ring under the conditions of thinner coating thickness and lower coating cost.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A low friction diamond-like coated piston ring having a textured structure comprising:
the piston ring comprises a piston ring base body (1), wherein the excircle surface (11) of the piston ring base body is a barrel surface which is a front barrel surface or a deviated barrel surface;
two rows of texture micro-pits (2) which are arranged on two sides of the top point of the barrel surface of the outer circular surface (11) are mutually parallel, and the positions of the upper row and the lower row of the texture micro-pits (2) are mutually staggered;
the transition layer (3) and the diamond-like coating (4) are sequentially arranged on the surfaces of the texture micro-pits (2) and the outer circular surface (11);
a contact band (111) formed on the apex of the barrel surface of the diamond-like coating (4) and continuously encircling the piston ring,
the surface degree of the outer circular surface (11) is 3-40 mu m,
the texture micro-pits (2) are spherical, the diameter of the texture micro-pits is 10-100 μm, the depth of the texture micro-pits is 5-20 μm,
the space between the texture micro pits is 3 to 5 times of the diameter of the texture micro pits.
2. A textured, low friction, diamond-like coated piston ring according to claim 1, characterized in that the diamond-like coating (4) has a thickness of 3 to 25 μm and the transition layer (3) has a thickness of 2 to 10% of the diamond-like coating thickness.
3. A textured, low friction diamond-like coated piston ring according to claim 1, characterized in that the transition layer (3) is one or a combination of chromium, titanium, chromium nitride, titanium nitride.
4. A method for preparing a low friction diamond-like coated piston ring with a textured structure according to any one of claims 1-3, comprising the steps of:
s1: processing the raw material to form a piston ring body, grinding and honing the outer circular surface of the piston ring body to form a barrel surface structure, and forming a honing contact belt to obtain a piston ring substrate;
s2: the surface of the piston ring substrate is subjected to purification treatment by ultrasonic cleaning or hydrocarbon cleaning;
s3: texturing the contact zone formed on the outer circular surface of the piston ring substrate by using pulse laser to form two parallel rows of mutually staggered textured micro pits;
s4: grinding and polishing the outer circular surface and cleaning and purifying the outer circular surface by using hydrocarbon;
s5: clamping the piston ring substrate, depositing a transition layer on the outer circular surface of the piston ring substrate and the surface of the texture micro-pit by using a physical vapor deposition coating furnace, and then depositing a diamond-like coating;
s6: and grinding and polishing the surface of the piston ring substrate to obtain a finished product.
5. The manufacturing method according to claim 4, wherein in the step S1, when the raw material is a cast iron material, the piston ring body is formed by casting, heat treatment, sheet cutting, and profiling; when the raw material is steel, the piston ring body is formed by ring winding, cutting and heat treatment.
6. The method according to claim 4, wherein in the step S3, the pulsed laser is used for texturing under the following conditions: UV laser or carbon dioxide laser is adopted, the pulse width is 8-14 mu s, the frequency is 20-65 KHZ, the beam diameter is 10-100 mu m, and the imprinting speed is 100-180 mm/s.
7. The preparation method according to claim 4, wherein in the step S5, the coating conditions of the transition layer are as follows: vacuum degree of furnace body 5X 10 -5 torr, process temperature 100-150 ℃, bias voltage 600-1000V, current 80-130 mA, and deposition time 1-3 hours.
8. The preparation method according to claim 4, wherein in the step S5, the diamond-like coating is coated under the following conditions: vacuum degree of furnace body 3X 10 -6 torr, process temperature 100-120 deg.C, bias voltage 600-800V, current 100-150 mA, and deposition time 5-25 hr.
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| CN113551034B (en) * | 2021-07-28 | 2024-07-23 | 安庆帝伯格茨活塞环有限公司 | Double transition layer diamond-like coating piston ring |
| CN113930730A (en) * | 2021-08-31 | 2022-01-14 | 安庆帝伯格茨活塞环有限公司 | Piston ring side diamond-like carbon film processing technology and tool assembly thereof |
| CN114892126A (en) * | 2022-05-10 | 2022-08-12 | 西南石油大学 | Diamond-like carbon film wear-resistant belt for drill rod joint |
| CN115058683B (en) * | 2022-06-22 | 2024-02-09 | 苏州大学 | Method for improving bonding strength of diamond-like coating film base on medical metal surface |
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| JP3749809B2 (en) * | 1999-10-06 | 2006-03-01 | 三菱マテリアル株式会社 | Piston ring composite wear-resistant ring with cooling cavity with excellent high-temperature wear resistance and thermal conductivity |
| CN103089479B (en) * | 2013-01-21 | 2015-09-30 | 南京理工大学 | With abrasion-proof piston ring and the preparation method of hard soft composite coating and textured surfaces |
| JP6339784B2 (en) * | 2013-09-30 | 2018-06-06 | 株式会社リケン | piston ring |
| CN109234676A (en) * | 2018-09-25 | 2019-01-18 | 安庆帝伯格茨活塞环有限公司 | A kind of diamond-like coating piston ring and preparation method containing transition zone |
| CN111520471A (en) * | 2020-05-07 | 2020-08-11 | 哈尔滨工程大学 | Internal combustion engine piston ring with parallel pit texture |
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