CN113551034A - Double-transition-layer diamond-like coating piston ring - Google Patents
Double-transition-layer diamond-like coating piston ring Download PDFInfo
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- CN113551034A CN113551034A CN202110857106.3A CN202110857106A CN113551034A CN 113551034 A CN113551034 A CN 113551034A CN 202110857106 A CN202110857106 A CN 202110857106A CN 113551034 A CN113551034 A CN 113551034A
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- 238000000576 coating method Methods 0.000 title claims abstract description 246
- 239000011248 coating agent Substances 0.000 title claims abstract description 236
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 69
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 68
- 230000007704 transition Effects 0.000 claims abstract description 52
- 229910021385 hard carbon Inorganic materials 0.000 claims abstract description 37
- 239000010936 titanium Substances 0.000 claims abstract description 37
- 229910021384 soft carbon Inorganic materials 0.000 claims abstract description 34
- 239000000758 substrate Substances 0.000 claims abstract description 32
- 239000011651 chromium Substances 0.000 claims abstract description 31
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 30
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 30
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 30
- 230000037452 priming Effects 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000004215 Carbon black (E152) Substances 0.000 claims description 3
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000005238 degreasing Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 3
- 150000002430 hydrocarbons Chemical class 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000001771 vacuum deposition Methods 0.000 claims description 3
- 238000007747 plating Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 abstract description 4
- UMUXBDSQTCDPJZ-UHFFFAOYSA-N chromium titanium Chemical compound [Ti].[Cr] UMUXBDSQTCDPJZ-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 8
- 238000001228 spectrum Methods 0.000 description 6
- 229910003460 diamond Inorganic materials 0.000 description 5
- 239000010432 diamond Substances 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 3
- 238000000635 electron micrograph Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000013112 stability test Methods 0.000 description 3
- 238000000498 ball milling Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
Images
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
- C23C14/021—Cleaning or etching treatments
- C23C14/022—Cleaning or etching treatments by means of bombardment with energetic particles or radiation
-
- 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
- C23C14/025—Metallic sublayers
-
- 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
-
- 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
- C23C14/14—Metallic material, boron or silicon
- C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
Abstract
The invention discloses a double-transition-layer diamond-like coating piston ring, which comprises a piston ring substrate, a transition layer and a carbon coating; the transition layer comprises a chromium coating and a titanium coating which are combined with each other; the carbon coating comprises at least one group of soft carbon coating and hard carbon coating which are mutually combined, the hardness of the soft carbon coating of the piston ring from inside to outside is increased progressively, and the hardness of the hard carbon coating of the piston ring from inside to outside is increased progressively; the piston ring adopts the chromium-titanium composite coating as the transition layer, effectively improves the overall hardness gradient of the coating, further improves the combination effect between the carbon coating and the transition layer and the combination effect between the transition layer and the piston ring substrate, and alleviates the problem of peeling of the coating in a high-temperature environment. Adopt the composite construction that hard carbon coating and soft carbon coating set up in turn to absorb the partial stress of hard carbon coating release through soft carbon coating, can improve the coating that the inside stress release of carbon coating is uneven leads to and collapse the problem of taking off.
Description
Technical Field
The invention belongs to the technical field of piston rings, and particularly relates to a double-transition-layer diamond-like coating piston ring.
Background
The piston ring is used for imbedding the inside becket of piston slot, and the piston ring divide into two kinds: the compression ring can be used for sealing combustible mixed gas in the combustion chamber; the oil ring is used for scraping redundant oil on the cylinder, the piston ring is a metal elastic ring with large outward expansion deformation, the metal elastic ring is assembled in the annular groove with the section corresponding to the oil ring, and the reciprocating and rotating piston ring forms a seal between the outer circular surface of the ring and the cylinder and one side surface of the ring and the annular groove by the pressure difference of gas or liquid;
in order to reduce the friction loss of the piston ring, the most common method is to arrange a coating with a low friction coefficient on the friction surface of the piston ring, wherein the diamond-like coating can meet the low friction requirement of the piston ring, and the coating structure of the existing diamond-like coating piston ring is mostly as follows: the invention provides a matrix-transition layer-carbon coating, wherein the transition layer is mostly a chromium (Cr) layer or a titanium (Ti) layer and other single transition layers, the bonding between the single transition layers and the carbon coating and the matrix is poor, the phenomenon of film falling of the coating at high temperature is easy to occur, and simultaneously, the film is easy to collapse due to uneven stress release in the carbon coating.
Disclosure of Invention
The invention aims to provide a double-transition-layer diamond-like coating piston ring, which solves the following technical problems:
1. in the prior art, most of transition layers of the surface coating of the piston ring are single transition layers, the bonding property of the transition layers, a carbon coating and a matrix is poor, and the condition of film falling under a high-temperature condition is easy to occur during use, so that the effective service cycle of the piston ring is influenced;
2. in the prior art, the carbon coating on the surface of the piston ring is uneven in stress release, so that the carbon coating is easy to collapse and fall off in the using process, and the surface coating cannot achieve a good effect of reducing friction loss.
The purpose of the invention can be realized by the following technical scheme:
a double-transition-layer diamond-like coating piston ring comprises a piston ring substrate, a transition layer combined on the piston ring substrate and a carbon coating combined on the surface of the transition layer;
the transition layer comprises a chromium coating and a titanium coating which are combined with each other;
the carbon coating comprises at least one group of soft carbon coating and hard carbon coating which are mutually combined, wherein the hardness of the soft carbon coating is 1300-1700 HV, and the hardness of the hard carbon coating is 1800-3000 HV.
As a further aspect of the present invention, when the carbon coating includes a plurality of sets of soft carbon coatings and hard carbon coatings, the hardness of the soft carbon coating increases in the direction from inside to outside of the piston ring, and the hardness of the hard carbon coating increases in the direction from inside to outside of the piston ring;
as a further scheme of the invention, the total thickness of the carbon coating is 5-35 μm;
the corresponding relation between the thickness of the chromium coating and the total thickness of the carbon coating is approximate: y iscr≈0.01xc+0.15；
The corresponding relation between the thickness of the titanium coating and the total thickness of the carbon coating is approximate: y isTi≈0.018xc+0.20；
Wherein the thickness of the carbon coating is represented by xcThe thickness of the chromium coating is indicated by ycrThe thickness of the titanium coating is indicated by yTi；
As a further proposal of the invention, the chromium coating is combined with the piston ring substrate, and the hard carbon coating in the carbon coating is combined with the titanium coating;
the further scheme of the invention is that the thickness of the chromium coating is 100-500 nm, and the thickness of the titanium coating is 300-800 nm.
As a further proposal of the invention, the piston ring matrix is made of steel or cast iron.
As a further aspect of the present invention, the method for manufacturing a piston ring comprises the steps of:
firstly, roughening a piston ring substrate, and carrying out degreasing cleaning and hydrocarbon cleaning treatment;
secondly, clamping and wiping the treated piston ring substrate, and then charging the piston ring substrate into a furnace;
thirdly, adding the piston ring substrate treated in the second step into vacuum coating equipment, sealing, vacuumizing to a set vacuum degree, preheating, performing ion cleaning on the piston ring substrate, stopping heating, standing and cooling to 90-100 ℃;
fourthly, performing chromium target priming, then performing titanium target priming, and then performing alternate film plating of a hard carbon coating and a soft carbon coating;
and fifthly, after the carbon coating is finished in the fourth step, cooling and releasing pressure to obtain the coated piston ring.
As a further scheme of the invention, the preheating conditions in the third step are as follows: the temperature is 120 ℃, and the preheating time is 20 min.
As a further scheme of the invention, the conditions of the chromium target priming in the fourth step are 1-2 h and 110-130 ℃, and the conditions of the titanium target priming are 1.5-3 h and 110-130 ℃.
In a further aspect of the present invention, in the fourth step, when the hard carbon coating and the soft carbon coating are formed, the hard carbon coating is cooled to 90 to 110 ℃ after the forming, and then the soft carbon coating is formed, and the soft carbon coating is cooled to 90 to 110 ℃ after the forming, and then the hard carbon coating is formed.
The invention has the beneficial effects that:
(1) the piston ring adopts the chromium-titanium composite coating as the transition layer, so that the overall hardness gradient of the coating is effectively improved, the combination effect between the carbon coating and the transition layer and the combination effect between the transition layer and the piston ring substrate are improved, and the problem of peeling of the coating in a high-temperature environment is solved.
(2) Carbon coating in this application adopts the composite construction that stereoplasm carbon coating and soft carbon coating set up in turn, and multilayer stereoplasm carbon coating by interior and outer hardness increase progressively, and multilayer soft carbon coating by interior and outer hardness decrease progressively to absorb the partial stress of stereoplasm carbon coating release through soft carbon coating, thereby improve the coating that the inside stress release of carbon coating inequality leads to and collapse the problem of taking off, promoted carbon coating's effective live time.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a partial cross-sectional view of a dual transition layer diamond-like coated piston ring in accordance with the present invention;
FIG. 2 is a schematic representation of a sample of the carbon coating of example 1 at 50 times magnification;
FIG. 3 is an electron micrograph of a transition layer and a carbon coating of a piston ring according to example 2;
FIG. 4 is a SEM structural spectrum of the DLC coating in example 2;
FIG. 5 is a graph showing the results of the thermal stability test of the double transition layer in example 2;
FIG. 6 is an electron micrograph of a transition layer and a carbon coating of a piston ring according to comparative example 1;
FIG. 7 is a SEM structural spectrum of the DLC coating in comparative example 1;
FIG. 8 is a graph showing the results of the thermal stability test of the dual transition layer in comparative example 1;
FIG. 9 is an electron micrograph of a transition layer and a carbon coating of a piston ring according to comparative example 2;
FIG. 10 is a SEM structural spectrum of the DLC coating in comparative example 2;
fig. 11 is a graph showing the results of the thermal stability test of the double transition layer in comparative example 2.
In the figure: 1. a piston ring base; 2. a chromium coating; 3. a titanium coating; 4. and (3) coating carbon.
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.
As shown in figure 1, the double-transition-layer diamond-like coating piston ring comprises a piston ring substrate 1, a transition layer combined on the piston ring substrate 1 and a carbon coating 4 combined on the surface of the transition layer;
the piston base body 1 is made of steel or cast iron, the specific requirements can be reasonably changed according to the use scene of a piston ring, the transition layer comprises a chromium coating 2 and a titanium coating 3 which are mutually combined, wherein the thickness of the chromium coating 2 is 100-500 nm, and the thickness of the titanium coating 3 is 300-800 nm;
the carbon coating 4 comprises at least one group of soft carbon coating and hard carbon coating which are combined with each other, wherein the hardness of the soft carbon coating is 1300-1700 HV, and the hardness of the hard carbon coating is 1800-3000 HV.
Wherein the chromium coating 2 is combined with the piston ring substrate 1, the hard carbon coating in the carbon coating 4 is combined with the titanium coating 3, and the total thickness of the carbon coating 4 is 5-35 mu m;
the thickness of the chromium coating 2 corresponds approximately to the thickness of the carbon coating 4: y iscr≈0.01xc+0.15；
The thickness of the titanium coating 3 and the thickness of the carbon coating 4 have an approximate correspondence: y isTi≈0.018xc+0.20；
Wherein the thickness of the carbon coating 4 is denoted xcThe thickness of the chromium coating 2 is indicated as ycrThe thickness of the titanium coating 3 is indicated as yTi；
The double transition layers can improve the integral hardness gradient of the coating, so that the bonding strength between the carbon coating 4 and the transition layers and the piston ring substrate 1 is improved, the carbon coating 4 adopts a structure of alternating soft carbon coatings and hard carbon coatings, the soft carbon coatings can absorb partial stress released by the hard carbon coatings, and the problem of coating collapse caused by uneven stress release in the carbon coating 4 can be solved;
when the carbon coating 4 comprises a plurality of groups of soft carbon coatings and hard carbon coatings, the hardness of the soft carbon coatings of the piston ring from inside to outside is increased progressively, and the hardness of the hard carbon coatings of the piston ring from inside to outside is increased progressively;
the preparation method of the piston ring comprises the following steps:
firstly, roughening treatment is carried out on a piston ring substrate 1, and degreasing cleaning and hydrocarbon cleaning treatment are carried out;
secondly, clamping and wiping the treated piston ring substrate 1 and then charging the piston ring substrate into a furnace;
thirdly, adding the piston ring substrate 1 treated in the second step into vacuum coating equipment, sealing, vacuumizing to a set vacuum degree, preheating, performing ion cleaning on the piston ring substrate 1, stopping heating, and standing for 0.5h to 90-100 ℃;
wherein the preheating time is 20min, and the preheating temperature is 120 ℃;
fourthly, conducting chromium target priming, then conducting titanium target priming, conducting chromium target priming for 1-2 hours at 110-130 ℃, conducting titanium target priming for 1.5-3 hours at 110-130 ℃, then conducting alternate coating of the hard carbon coating and the soft carbon coating, conducting coating of the soft carbon coating after the hard carbon coating is cooled to 90-110 ℃ after forming, and conducting coating of the hard carbon coating after the soft carbon coating is cooled to below 90-110 ℃ after forming.
And fifthly, after the carbon coating 4 is finished in the fourth step, cooling and releasing pressure to obtain the coated piston ring.
Example 1
In one specific embodiment of the present application, the carbon coating 4 comprises ten groups of mutually combined soft carbon coating and hard carbon coating, wherein the hardness of the hard carbon coating along the piston ring from inside to outside is 1800, 1920, 2040, 2160, 2280, 2400, 2520, 2640, 2760 and 2880; wherein the hardness of the soft carbon coating along the piston ring from inside to outside is 1300, 1350, 1400, 1450, 1500, 1550, 1600, 1650 and 1700 respectively;
performing ball milling test on the formed carbon coating, wherein the test result is shown in figure 2;
the conditions of the ball milling test were: grinding the coating for 10min by using a diamond powder grinding agent with the thickness of 1-2 microns, and then grinding for 20min by using a diamond powder grinding agent with the thickness of 0.25-0.5 microns, wherein the grinding angle is as follows: and the angle between the horizontal line and the horizontal line is 45-60 degrees.
Example 2
A double-transition-layer diamond-like coating piston ring comprises a piston ring substrate 1, a transition layer combined on the piston ring substrate 1 and a carbon coating 4 combined on the surface of the transition layer;
the transition layer comprises a chromium coating 2 and a titanium coating 3 which are mutually combined, wherein the thickness of the chromium coating 2 is 150nm, and the thickness of the titanium coating 3 is 350 nm;
the distribution of the carbon coating 4 was the same as in example 1
Wherein the chromium coating 2 is combined with the piston ring substrate 1, the hard carbon coating in the carbon coating 4 is combined with the titanium coating 3, and the total thickness of the carbon coating 4 is 8 mu m;
the molded piston rings were tested:
the transition layer and the carbon coating 4 of the formed piston ring are shown in figure 3 by an electron microscope;
SEM structural spectrum of DLC coating of the formed piston ring, as shown in fig. 4;
the coating thermal stability of the formed piston ring is tested (the test condition is baking for 2 hours at 300 ℃), the test chart is shown in figure 5, and the coating after high-temperature treatment has no obvious peeling phenomenon;
the coating cohesion of the formed piston ring is tested (the diamond needle of the scratch tester gradually applies load to the surface of the coating to slide until the coating collapses, and the corresponding load is the maximum binding force of the coating), and the result is as follows: 59N, and (3).
Comparative example 1
A double-transition-layer diamond-like coating piston ring comprises a piston ring substrate 1, a transition layer combined on the piston ring substrate 1 and a carbon coating 4 combined on the surface of the transition layer;
the transition layer is a chromium coating 2, wherein the thickness of the chromium coating 2 is 500 nm;
the distribution of the carbon coating 4 was the same as in example 1
The hard carbon coating in the carbon coating 4 is combined with the chromium coating 2, and the total thickness of the carbon coating 4 is 8 mu m;
the molded piston rings were tested:
an electron microscope image of the transition layer and the carbon coating of the formed piston ring is shown in FIG. 6;
SEM structural spectrum of DLC coating of the formed piston ring, as shown in fig. 7;
the coating thermal stability of the formed piston ring is tested (the test condition is baking for 2 hours at 300 ℃), and the test result is shown in figure 8, and the coating slightly breaks off;
the coating cohesion of the formed piston ring is tested (the diamond needle of the scratch tester gradually applies load to the surface of the coating to slide until the coating collapses, and the corresponding load is the maximum binding force of the coating), and the result is as follows: 48N.
Comparative example 2
A double-transition-layer diamond-like coating piston ring comprises a piston ring substrate 1, a transition layer combined on the piston ring substrate 1 and a carbon coating 4 combined on the surface of the transition layer;
the transition layer is a titanium coating 3, wherein the thickness of the titanium coating 3 is 500 nm;
the distribution of the carbon coating 4 was the same as in example 1
The hard carbon coating in the carbon coating 4 is combined with the titanium coating 3, and the total thickness of the carbon coating 3 is 8 mu m;
the molded piston rings were tested:
the transition layer of the formed piston ring and the carbon coating 4 are shown in FIG. 9 by an electron microscope;
SEM structural spectrum of DLC coating of the formed piston ring, as shown in fig. 10;
the coating thermal stability of the formed piston ring was tested (test condition was baking at 300 ℃ for 2 hours), and the test result is shown in fig. 11, where the coating slightly broke off;
the coating cohesion of the formed piston ring is tested (the diamond needle of the scratch tester gradually applies load to the surface of the coating to slide until the coating collapses, and the corresponding load is the maximum binding force of the coating), and the result is as follows: 41N.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The utility model provides a two transition layer diamond-like coating piston rings, includes piston ring base member (1) and combines the transition layer on piston ring base member (1), still includes carbon coating (4) that combine in the transition layer surface, its characterized in that:
the transition layer comprises a chromium coating (2) and a titanium coating (3) which are combined with each other;
the carbon coating (4) comprises at least one group of soft carbon coating and hard carbon coating which are mutually combined, wherein the hardness of the soft carbon coating is 1300-1700 HV, and the hardness of the hard carbon coating is 1800-3000 HV.
2. The double transition layer diamond-like coating piston ring according to claim 1, characterized in that when the carbon coating (4) comprises a plurality of sets of soft carbon coating and hard carbon coating, the hardness of the soft carbon coating increases from the inside to the outside of the piston ring, and the hardness of the hard carbon coating increases from the inside to the outside of the piston ring.
3. The double transition layer diamond-like coated piston ring according to claim 2, characterized in that the total thickness of the carbon coating (4) is 5 to 35 μm;
the thickness of the chromium coating (2) and the thickness of the carbon coating (4) are approximately corresponding to each other: y iscr≈0.01xc+0.15；
The thickness of the titanium coating (3) and the thickness of the carbon coating (4) are approximately corresponding to each other: y isTi≈0.018xc+0.20；
Wherein the thickness of the carbon coating (4) is represented by xcThe thickness of the chromium coating (2) is expressed as ycrThe thickness of the titanium coating (3) is expressed as yTi。
4. A double transition diamond-like coated piston ring according to claim 1, characterised in that a chromium coating (2) is bonded to the piston ring base body (1) and a hard carbon coating of the carbon coating (4) is bonded to the titanium coating (3).
5. The double-transition-layer diamond-like coating piston ring according to claim 4, wherein the thickness of the chromium coating (2) is 100 to 500nm, and the thickness of the titanium coating (3) is 300 to 800 nm.
6. The double transition layer diamond-like coated piston ring according to claim 1, characterized in that the piston ring base (1) is made of steel or cast iron.
7. The double transition layer diamond-like coated piston ring as set forth in claim 1, which is prepared by a process comprising the steps of:
firstly, roughening treatment is carried out on a piston ring substrate (1), and degreasing cleaning and hydrocarbon cleaning treatment are carried out;
secondly, clamping and wiping the treated piston ring substrate (1) and then charging the piston ring substrate into a furnace;
thirdly, adding the piston ring substrate (1) treated in the second step into vacuum coating equipment, sealing, vacuumizing to a set vacuum degree, preheating, performing ion cleaning on the piston ring substrate (1), stopping heating, standing and cooling to 90-100 ℃;
fourthly, performing chromium target priming, then performing titanium target priming, and then performing alternate film plating of a hard carbon coating and a soft carbon coating;
and fifthly, after the carbon coating (4) is finished in the fourth step, cooling and releasing pressure to obtain the coated piston ring.
8. The double transition diamond-like coated piston ring as set forth in claim 7 wherein the preheating in the third step is carried out under the conditions of: the temperature is 120 ℃, and the preheating time is 20 min.
9. The double-transition-layer diamond-like coating piston ring according to claim 7, wherein the conditions for priming with the chromium target in the fourth step are 1-2 hours and 110-130 ℃, and the conditions for priming with the titanium target are 1.5-3 hours and 110-130 ℃.
10. The piston ring with the double transition layer diamond-like coating according to claim 7, wherein in the fourth step, when the hard carbon coating and the soft carbon coating are coated, the hard carbon coating is cooled to 90 to 110 ℃ after molding, then the soft carbon coating is coated, and the soft carbon coating is cooled to 90 to 110 ℃ after molding, and then the hard carbon coating is coated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110857106.3A CN113551034A (en) | 2021-07-28 | 2021-07-28 | Double-transition-layer diamond-like coating piston ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110857106.3A CN113551034A (en) | 2021-07-28 | 2021-07-28 | Double-transition-layer diamond-like coating piston ring |
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| Publication Number | Publication Date |
|---|---|
| CN113551034A true CN113551034A (en) | 2021-10-26 |
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| CN202110857106.3A Pending CN113551034A (en) | 2021-07-28 | 2021-07-28 | Double-transition-layer diamond-like coating piston ring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114905058A (en) * | 2022-05-20 | 2022-08-16 | 沈阳金锋特种刀具有限公司 | Graphene composite coating cutter and preparation method thereof |
| CN116676557A (en) * | 2023-06-08 | 2023-09-01 | 广东省广新离子束科技有限公司 | Drill bit with self-lubricating DLC coating and preparation method thereof |
| CN114905058B (en) * | 2022-05-20 | 2024-04-26 | 沈阳金锋特种刀具有限公司 | Graphene composite coating cutter and preparation method thereof |
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| WO2006125683A1 (en) * | 2005-05-26 | 2006-11-30 | Nv Bekaert Sa | Piston ring having hard multi-layer coating |
| CN105102680A (en) * | 2012-08-10 | 2015-11-25 | 菲特尔莫古布尔沙伊德有限公司 | Sliding element, in particular piston ring, having resistant coating |
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| CN109372651A (en) * | 2018-09-25 | 2019-02-22 | 安庆帝伯格茨活塞环有限公司 | A kind of diamond-like coating piston ring and preparation method |
| CN112555409A (en) * | 2020-11-20 | 2021-03-26 | 安庆帝伯格茨活塞环有限公司 | Low-friction diamond-like coating piston ring with texture structure and preparation method thereof |
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| WO2006125683A1 (en) * | 2005-05-26 | 2006-11-30 | Nv Bekaert Sa | Piston ring having hard multi-layer coating |
| CN105102680A (en) * | 2012-08-10 | 2015-11-25 | 菲特尔莫古布尔沙伊德有限公司 | Sliding element, in particular piston ring, having resistant coating |
| CN107022761A (en) * | 2017-04-28 | 2017-08-08 | 星弧涂层新材料科技（苏州）股份有限公司 | Composite thick film and its film plating process based on DLC film |
| CN109372651A (en) * | 2018-09-25 | 2019-02-22 | 安庆帝伯格茨活塞环有限公司 | A kind of diamond-like coating piston ring and preparation method |
| CN112555409A (en) * | 2020-11-20 | 2021-03-26 | 安庆帝伯格茨活塞环有限公司 | Low-friction diamond-like coating piston ring with texture structure and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114905058A (en) * | 2022-05-20 | 2022-08-16 | 沈阳金锋特种刀具有限公司 | Graphene composite coating cutter and preparation method thereof |
| CN114905058B (en) * | 2022-05-20 | 2024-04-26 | 沈阳金锋特种刀具有限公司 | Graphene composite coating cutter and preparation method thereof |
| CN116676557A (en) * | 2023-06-08 | 2023-09-01 | 广东省广新离子束科技有限公司 | Drill bit with self-lubricating DLC coating and preparation method thereof |
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