CN101430004A - PVD chromium based ceramic composite coating piston ring and method for producing the same - Google Patents
PVD chromium based ceramic composite coating piston ring and method for producing the same Download PDFInfo
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- CN101430004A CN101430004A CNA2008102368169A CN200810236816A CN101430004A CN 101430004 A CN101430004 A CN 101430004A CN A2008102368169 A CNA2008102368169 A CN A2008102368169A CN 200810236816 A CN200810236816 A CN 200810236816A CN 101430004 A CN101430004 A CN 101430004A
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Abstract
The invention discloses a PVD chromium base ceramic composite coating piston ring and a preparation method thereof, and the piston ring is manufactured by plating a chromium base ceramic composite coating on a basal body of the piston ring which is treated by nitriding by adopting high power electric arc discharge method; the chromium base ceramic composite coating is composed of a bonding layer, a main wearing layer and an anti-attrition layer, wherein, the bonding layer is binded with the basal body of the piston ring in a metallurgical way, the main wearing layer is arranged on the bonding layer, and the anti-attrition layer is positioned on the surface of the main wearing layer; the bonding layer is Cr, the main wearing layer is a Cr/CrN multilayer coating formed by the Cr and the CrN which are alternately arranged, and the anti-attrition layer is a Cr/Cr2O3 multilayer coating formed by the Cr and the Cr2O3 that are alternately arranged. The coating structure has reasonable design, and the manufactured coating has good cementing property, high hardness and good lubricating property. Furthermore, the method used for manufacturing the piston ring has no pollution in the preparation process, and overcomes the serious problem of environmental pollution of the conventional electrodeposited chromium; as the manufactured coating has better abrasion resistant and corrosion resistant performance compared with the electrodeposited chromium, the service life of the piston ring is greatly prolonged.
Description
Technical field
The present invention relates to a kind of PVD chromium based ceramic composite coating piston ring and preparation method thereof, belong to the thin-film material field.
Background technique
Piston ring and piston are one of parts the most key in the motor.Nitriding at present and chromium plating are piston ring surface use technology the most widely, because the wear resistance of nitriding piston ring is than electrochromism difference, the piston ring chrome-faced becomes the major measure that improves its working life.It changes the character of rubbing surface by at its cylindrical or upper and lower end face even internal circular surfaces covering chromium layer, reaches the purpose that improves the piston ring wear resistance.Facts have proved that after the chromium plating of first ring, its life-span prolongs 3～5 times than cast iron ring. electricity prolongs the service life of second, the 3rd road ring simultaneously.The chromium coating structure is thin, and hardness can reach 700～900HV and fine and close, and friction factor is less, and very high to the corrosion resistance of products of combustion sulfuric acid etc., its shortcoming is the ability of soaking into lubricant oil.Because chrome-plated process process toxicity is quite big, even adopt multiple measure, befouling environment inevitably still.Say that from preparation technology the clamping of piston ring, power consumption and the amount of labour are quite big in the chrome-plating process.Say that from coating performance chromium coating is more crisp, defectiveness is cracked immediately slightly comes off, and forms the particle of high hardness, and this is one of the major reason of cylinder damage often.20～30% substandard product is often arranged from product percent of pass.Therefore, the big chrome-plated process of cancellation toxicity, seeking a kind of process of surface treatment that not only keeps the wearability of piston ring but also do not have to pollute is the problem of a urgent need.
In order to seek substitute technology, international and domesticly carried out long-term a large amount of work, mainly concentrate on chemical nickel phosphorus plating, thermal spraying, Brush Plating.There is pollution to a certain degree in the chemical nickel phosphorus plating treatment process, and hardness lower (Hv500-600); The efficient of thermal spraying is higher, but body material is had certain requirement, and the material of spraying is limited, and the rough surface of spraying needs secondary operations; The brush plating has than electroplating better adhesion, better to the parts using effect that shape is fairly simple, in the reparation of heavy mechanical equipment macro-axis, brought into play good effect, then can't carry out coating efficiently, on performance, can't compare with electrochromism to piston ring.Replacing traditional electrochromism coating with free of contamination physical gas phase deposition technology (Physical Vapor Deposition: be called for short PVD) chromium plating based ceramic composite coating is the trend of development in recent years, many research institutions have carried out many good tries both at home and abroad, comprise that electron beam steams method, ion beam sputtering, cathodic arc deposition and magnetron sputtering etc.Wherein electron beam evaporation deposition efficient is higher, but its plated film directivity is strong, uniformity is relatively poor, adhesion is low, be unfavorable for the preparation of complicated appearance workpiece; The coating of tradition magnetically controlled sputter method preparation does not have the drop problem, and preparation temperature is lower simultaneously, can be prepared on various body materials (as iron and steel, non-ferrous metal, plastics etc.), but it is less to carry the energy ion, and coating speed is lower, is difficult to carry out the thick film preparation.Above-mentioned all kinds of film plating process deposition rate is generally at several microns/hours.And general electrochromism fitness for purpose thickness plated 10～30 hours as if then meaning with conventional method at 50～150 microns, and the coating cost sharply rises.Said method coating growth rate after carrying out reaching certain thickness when thick film prepares reduces, because the stress increase can cause coating shedding, can not carry out the industrial production of scale simultaneously.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of PVD chromium based ceramic composite coating piston ring and preparation method thereof is provided, this kind piston ring has good wear-resisting and greasy property; Can reduce the wearing and tearing of piston ring behind the employing PVD chromium based ceramic composite coating piston ring, in automobile and motorcycle industry extensive use, can reduce the fault rate in automobile and the motorcycle running, prolong the maintenance cycle of engine, improve Operation safety.Present technique absorbs the foreign latest cladding technique based on the high density large power, electrically arc discharge technology of independent research, carries out the preparation of PVD chromium plating base ceramic coating, replaces existing electrochromism coating, the heavy metal pollution problem of avoiding plating production process to cause.
For achieving the above object, technical scheme provided by the invention is: a kind of PVD chromium based ceramic composite coating piston ring, it comprises the piston ring matrix of processing through nitriding and the chromium based ceramic composite coating that adheres at this piston ring matrix, chromium based ceramic composite coating is made of tack coat, main wearing layer and anti-attrition layer, tack coat and piston ring matrix are metallurgical binding, main wearing layer is on tack coat, and anti-attrition layer is on the surface of main wearing layer; Tack coat is transition metal Cr, and main wearing layer is the Cr/CrN laminated coating that Cr layer and CrN layer alternately consist of, and anti-attrition layer is Cr layer and Cr
2O
3The Cr/Cr that layer alternately consists of
2O
3Laminated coating; Adhesive layer thickness is 100～200 nanometers, and main wearing layer thickness is 10～20 microns, alternately is made of 2 to 4 layers of Cr layer and CrN layer, and the thickness of every layer of Cr is 100～200 nanometers, and the thickness of every layer of CrN is 4～5 microns; Anti-attrition layer thickness is 5～10 microns, by 2 to 5 layers of Cr layer and Cr
2O
3Layer alternately consists of, and the thickness of every layer of Cr is 100～200 nanometers, every layer of Cr
2O
3Thickness be 1～3 micron.
The present invention also provides the preparation method of above-mentioned PVD chromium based ceramic composite coating piston ring: under 400～450 ℃, ar gas environment, the piston ring matrix of processing through nitriding is carried out aura to be cleaned, bias voltage in the glow discharging process on the workpiece is-800V～-1200V, the aura time is 30～60 minutes; After aura cleans and finishes, at the transition metal Cr layer of 0.3～1.0Pa condition with arc discharge method deposition 100～200 nanometer thickness; Then 400～450 ℃ ,-100V～-250V bias voltage, 2～5Pa air pressure conditions under, with 10～20 microns main wearing layers of arc discharge method deposition, this main wearing layer is the Cr/CrN laminated coating that Cr layer and CrN layer alternately consist of, the thickness of every layer of Cr is 100～200 nanometers, and the thickness of every layer of CrN is 4～5 microns; After main wearing layer deposition finishes, 400～450 ℃ ,-100V～-250V bias voltage, 2～5Pa air pressure conditions under, with 5～10 microns anti-attrition layers of arc discharge method deposition, this anti-attrition layer is Cr layer and Cr
2O
3The Cr/Cr that layer alternately consists of
2O
3Laminated coating, the thickness of every layer of Cr are 100～200 nanometers, every layer of Cr
2O
3Thickness be 1～3 micron; Naturally cooling obtained the PVD chromium based ceramic composite coating piston ring after preparation finished.
The present invention utilizes the large power electric arc electric discharge to prepare chromium based ceramic composite coating as shown from the above technical solution.This method at first utilizes the high ionization level of arc-discharge technique that the Cr ion is evaporated from the Cr target, does not generate the Cr tack coat at workpiece when not passing into nitrogen under the argon gas condition, after the tack coat preparation finishes, passes into the nitrogen reaction and generates CrN.Because CrN coating layer thickness coating stress more than 4 microns the time is bigger, and coating is peeled off from workpiece.In order to overcome the stress problem of CrN thick coating, the present invention adopts Cr and CrN to form Cr/CrN laminated coating structure, can reduce coating stress significantly.In order to realize the preparation of Cr/CrN sandwich construction, discontinuity pass into nitrogen, the control make-and-break time then can carry out the preparation of Cr/CrN master's wearing layer.Because piston ring and cylinder sleeve are a pair of friction pairs, when improving the piston ring surface hardness,, need make the piston ring surface have good lubricating property in the lower coating of the surface preparation friction factor of piston ring in order to make the better break-in of piston ring and cylinder sleeve.Because Cr
2O
3Coating not only has very high hardness (30GPa), the coefficient of friction to iron and steel lower (being about 0.3) simultaneously, and the present invention adopts Cr for this reason
2O
3Anti-attrition layer as piston ring surface.But because Cr
2O
3The high rigidity of coating causes its internal stress higher than CrN, and coating is peeled off from workpiece.In order to overcome Cr
2O
3The stress problem of thick coating, the present invention adopts Cr and Cr
2O
3Form Cr/Cr
2O
3The laminated coating structure can the decrease coating stress.In order to realize Cr/Cr
2O
3The preparation of sandwich construction, discontinuity pass into oxygen, the control make-and-break time then can carry out Cr/Cr
2O
3The preparation of anti-attrition layer.
Therefore the present invention has following advantage: the first, compare with electrochromism, and the present invention adopts complete free of contamination large power, electrically arc discharge technology, has overcome heavy metal pollution problem serious in the electrochromism; The second, the present invention is owing to adopt the large power, electrically arc discharge method, and coating and matrix are metallurgy combination, have good adhesion, can not produce spalling phenomenon sometimes as electrochromism, produces the cylinder sleeve incident that scratches in cylinder sleeve; The 3rd, the prepared chromium based ceramic composite coating of the present invention has the micro-penetration hardness up to 30GPa, and electrochromism has only about 8GPa, because abrasion property and hardness are directly related, so the prepared chromium based ceramic composite coating of the present invention has than electrochromism better wear resistance energy; The 4th, because the top of floating coat of the present invention is an anti-attrition layer, make chrome-base ceramic coating friction factor lower (0.3), the friction factor of electrochromism and steel is then more than 0.6, therefore the chrome-base ceramic coating has than the better greasy property of electrochromism, can reduce the running-in time of piston ring and cylinder sleeve and the wearing and tearing in the using process significantly; The 5th, the present invention adopts the large power, electrically arc discharge technology to carry out the preparation of chrome-base ceramic coating, overcome not only that the low coating hardness that causes of conventional ion coating technology vacuum chamber ionic medium bulk density is low, combination force difference and the bad problem of uniformity, coating apparatus is simple in structure simultaneously, be easy to control, prospects for commercial application is good.
Arc ion plating (aip) is the main preparation technology of present hard coat owing to have characteristics such as pollution-free, that ionization level is high, deposition rate is fast, ion energy is big, cost is low.Arc ion plating CrN and Cr
2O
3Coating has high rigidity, good wearability and corrosion resistance, is the good alternative coating of electrodeposited chromium.The present invention is directed to serious pollution problem in the existing piston ring chrome-faced, adopt complete free of contamination large power electric arc electric discharge at piston ring surface preparation chromium based ceramic composite coating.This technology makes composite coating have very high case hardness and good greasy property on the one hand, and the employing of sandwich construction can decrease coating internal stress on the other hand, can carry out the preparation of thicker ceramic coating.Characteristics such as the high hardness of PVD chrome-base ceramic coating piston ring, low coefficient of friction, good adhesion and multi-layer structure show huge advantage at automobile and motorcycle piston ring surface abrasion resistance aspect lubricated.Develop application and the realization industrialization of PVD chrome-base ceramic coating technology in piston ring, can effectively solve the fretting wear problem of piston ring surface, bring huge economic and social benefit.
The present invention has guaranteed the long-term stable operation of piston ring owing to the good wear-resisting and greasy property of PVD chrome-base ceramic coating, and piston ring and cylinder sleeve running-in time are shortened, and has prolonged the overhaul life of motor, has great using value.
In a word, the present invention not only can overcome the heavy metal pollution problem of electrochromism because of its technical superiority makes it, inherit simultaneously characteristics such as conventional cathode arc discharge method deposition rate is fast, ionization level height again, make the hardness, adhesion, uniformity etc. of coating be better than the coating of conventional plating and arc discharge method preparation, in industry, have a good application prospect.
Description of drawings
The PVD chromium based ceramic composite coating preparing apparatus schematic representation of Fig. 1 for being adopted among the present invention.Among the figure: 1. fire door 2. vacuum pumping opening 3. heaters 4. work rests 5. circular Cr electric arc target
Fig. 2 is the surface topography map of PVD chromium based ceramic composite coating.
Fig. 3 is the sectional view of PVD chromium based ceramic composite coating.
Fig. 4 is the interface microscopic appearance figure of PVD chromium based ceramic composite coating and matrix.
Fig. 5 is the contrast Honing Experiment figure as a result of PVD chromium based ceramic composite coating piston ring and electrodeposited chromium ring, nitriding ring.
Embodiment
Below in conjunction with specific embodiment technological scheme of the present invention is described further:
Embodiment 1: under 400 ℃, ar gas environment, the piston ring of processing through nitriding is carried out aura clean, the bias voltage in the glow discharging process on the workpiece is-1000V that the aura time is 30 minutes; After aura cleans and finishes, deposit the transition metal Cr layer of 150 nanometer thickness with arc discharge method in the 0.3Pa air pressure conditions; Then 450 ℃ ,-150V bias voltage, 2.3Pa air pressure conditions under with 20 microns Cr/CrN master's wearing layers of arc discharge method deposition, wherein every layer of Cr is 0.2 micron, every layer of CrN is 4.8 microns, and the two-layer thickness of Cr and CrN is 5 microns, and main wearing layer comprises 4 layers of Cr and 4 layers of CrN; After main wearing layer deposition finishes, 450 ℃ ,-200V bias voltage, 3.3Pa air pressure conditions under with 10 microns Cr/Cr of arc discharge method deposition
2O
3Anti-attrition layer, wherein every layer of Cr is 0.1 micron, every layer of Cr
2O
3Be 1.9 microns, Cr and Cr
2O
3Two-layer thickness is 2 microns, and anti-attrition layer comprises 5 layers of Cr and 5 layers of Cr
2O
3Naturally cooling obtained the PVD chromium based ceramic composite coating piston ring after preparation finished, and wherein, was attached with successively from inside to outside 150 nano transition metal Cr tack coats, 20 microns Cr/CrN master's wearing layers and 10 microns Cr/Cr on the piston ring matrix
2O
3Anti-attrition layer.
Embodiment 2: under 430 ℃, ar gas environment, the piston ring of processing through nitriding is carried out aura clean, the bias voltage in the glow discharging process on the workpiece is-1200V that the aura time is 60 minutes; After aura cleans and finishes, deposit the transition metal Cr layer of 100 nanometer thickness with arc discharge method in the 0.5Pa air pressure conditions; Then 430 ℃ ,-200V bias voltage, 3Pa air pressure conditions under with 18 microns Cr/CrN master's wearing layers of arc discharge method deposition, wherein every layer of Cr is 0.2 micron, every layer of CrN is 4.3 microns, and two-layer thickness is 4.5 microns, and main wearing layer comprises 4 layers of Cr and 4 layers of CrN; After main wearing layer deposition finishes, 450 ℃ ,-200V bias voltage, 4.3Pa air pressure conditions under with 6 microns Cr/Cr of arc discharge method deposition
2O
3Anti-attrition layer, wherein every layer of Cr is 0.2 micron, every layer of Cr
2O
3Be 1.8 microns, Cr and Cr
2O
3Two-layer thickness is 2 microns, and anti-attrition layer comprises 3 layers of Cr and 3 layers of Cr
2O
3Naturally cooling obtained the PVD chromium based ceramic composite coating piston ring after preparation finished, and wherein, was attached with successively from inside to outside 100 nano transition metal Cr tack coats, 18 microns Cr/CrN master's wearing layers and 6 microns Cr/Cr on the piston ring matrix
2O
3Anti-attrition layer.
Embodiment 3: under 450 ℃, ar gas environment, the piston ring of processing through nitriding is carried out aura clean, the bias voltage in the glow discharging process on the workpiece is-1200V that the aura time is 30 minutes; After aura cleans and finishes, deposit the transition metal Cr layer of 150 nanometer thickness with arc discharge method in the 1.0Pa air pressure conditions; Then 450 ℃ ,-230V bias voltage, 5Pa air pressure conditions under with 15 microns Cr/CrN master's wearing layers of arc discharge method deposition, wherein every layer of Cr is 0.1 micron, every layer of CrN is 4.9 microns, and the two-layer thickness of Cr and CrN is 5 microns, and main wearing layer comprises 3 layers of Cr and 3 layers of CrN; After main wearing layer deposition finishes, 440 ℃ ,-150V bias voltage, 3.3Pa air pressure conditions under with 10 microns Cr/Cr of arc discharge method deposition
2O
3Anti-attrition layer, wherein every layer of Cr is 0.1 micron, every layer of Cr
2O
3Be 2.4 microns, Cr and Cr
2O
3Two-layer thickness is 2.5 microns, and anti-attrition layer comprises 4 layers of Cr and 4 layers of Cr
2O
3Naturally cooling obtained the PVD chromium based ceramic composite coating piston ring after preparation finished, and wherein, was attached with successively from inside to outside 150 nano transition metal Cr tack coats, 15 microns Cr/CrN master's wearing layers and 10 microns Cr/Cr on the piston ring matrix
2O
3Anti-attrition layer.
Implement preparing apparatus of the present invention as shown in Figure 1, the vacuum chamber of device is surrounded by the furnace wall, and the vacuum chamber height is 0.5～1 meter, and diameter is 700～900mm.The vacuum chamber side is provided with fire door 1, to make things convenient for the loading and unloading of workpiece.Vacuum chamber is provided with vacuum orifice 2, vacuumizes unit and vacuumizes by 2 pairs of vacuum chambers of vacuum orifice, and vacuumizing unit can be made up of diffusion pump and mechanical pump, also can adopt molecular pump, and limiting vacuum can reach 6 * 10
-4Pa.5 minutes four row of circular Cr electric arc target are distributed on the furnace wall, and circular electric arc target diameter is 80～100mm, is provided with 12～16 circular electric arc target, and the current range of single electric arc target is 150～200A.On the furnace wall and in the middle of the vacuum chamber a plurality of heaters 3 are installed, can conveniently regulate the temperature in the vacuum chamber.Sample is contained on the work rest 4, revolves round the sun and rotation.Owing to adopted powerful electric arc target technology, vacuum chamber ionic medium bulk density increases considerably, and workpiece is immersed in the plasma fully.Coating deposition rate, hardness, adhesion are greatly improved.Because target structure is optimized, Distribution of Magnetic Field is more even, makes electric arc evenly burning on target surface, has improved the uniformity and the consumption that has reduced target of coating.Substrate DC bias is that 0～1200V is adjustable continuously.Working gas is N
2And oxygen, controlled by mass flowmenter.The substrate rotating speed adjustable.
The surface topography of the PVD chromium based ceramic composite coating that Fig. 2 makes for the present invention, as can be seen from the figure, there is the particle of some in coating surface, and this is that arc discharge method has the most typical feature.
The PVD chromium based ceramic composite coating sectional view that Fig. 3 makes for the present invention.As can be seen from the figure PVD chromium based ceramic composite coating compact structure does not have obvious column crystal growth, and coating quality is better, and coating layer thickness is near 20 microns.
The microscopic appearance figure of the PVD chromium based ceramic composite coating that Fig. 4 makes for the present invention and the interface of piston ring matrix as can be seen from the figure, is metallurgical binding between coatings and substrate, does not have obvious interface, has than the better adhesive force of electrodeposited chromium.
Fig. 5 is adding the result that the contrast honing is tested under the honing condition of white fused alumina sand for PVD chromium based ceramic composite coating piston ring and chrome-faced ring, the nitriding ring that the present invention makes.Wherein, curve 1 expression CG150PVD chromium plating base ceramic coating encircles 1 honing result together, curve 2 expression CG150PVD chromium plating base ceramic coatings encircle 2 honing result together, curve 3 expression East Asia CG150 electrochromisms are the honing result of ring together, and curve 4 expression Japan reasons are ground the 462Q nitrogenize honing result of ring together.As can be seen from the figure, when the honing number of times reaches 10000 times, electrochromism piston ring and nitriding piston ring all lost efficacy, compare with them, the PVD chromium based ceramic composite coating piston ring has the better wear resistance energy, be more than the twice of electrochromism ring and nitriding ring its friction durability, has favorable industrial application prospect in automobile and motorcycle industry.
Claims (9)
1. PVD chromium based ceramic composite coating piston ring, it is characterized in that: it comprises the piston ring matrix of processing through nitriding and the chromium based ceramic composite coating that adheres at this piston ring matrix, this composite coating is made of tack coat, main wearing layer and anti-attrition layer, tack coat and piston ring matrix are metallurgical binding, main wearing layer is on tack coat, anti-attrition layer is on the surface of main wearing layer, tack coat is transition metal Cr, main wearing layer is the Cr/CrN laminated coating that Cr layer and CrN layer alternately consist of, and anti-attrition layer is Cr layer and Cr
2O
3The Cr/Cr that layer alternately consists of
2O
3Laminated coating.
2. PVD chromium based ceramic composite coating piston ring according to claim 1 is characterized in that: adhesive layer thickness is 100～200 nanometers.
3. PVD chromium based ceramic composite coating piston ring according to claim 1, it is characterized in that: main wearing layer thickness is 10～20 microns, alternately be made of 2 to 4 layers of Cr layer and CrN layer, the thickness of every layer of Cr is 100～200 nanometers, and the thickness of every layer of CrN is 4～5 microns.
4. PVD chromium based ceramic composite coating piston ring according to claim 1, it is characterized in that: anti-attrition layer thickness is 5～10 microns, by 2 to 5 layers of Cr layer and Cr
2O
3Layer alternately consists of, and the thickness of every layer of Cr is 100～200 nanometers, every layer of Cr
2O
3Thickness be 1～3 micron.
5. the preparation method of a PVD chromium based ceramic composite coating piston ring, it is characterized in that adopting the large power electric arc electric discharge to be coated with chromium based ceramic composite coating at the piston ring matrix, specifically may further comprise the steps: the piston ring matrix of processing through nitriding is carried out aura clean; After aura cleaned and finishes, at 0.3～1.0Pa air pressure conditions deposit tack coat, this tack coat was transition metal Cr; Then 400～450 ℃ ,-100V～-250V bias voltage, 2～5Pa air pressure conditions deposit master wearing layer, this main wearing layer is the Cr/CrN laminated coating that Cr layer and CrN layer alternately consist of; After main wearing layer deposition finishes, 400～450 ℃ ,-100V～-250V bias voltage, 2～5Pa air pressure conditions deposit anti-attrition layer, this anti-attrition layer is Cr layer and Cr
2O
3The Cr/Cr that layer alternately consists of
2O
3Laminated coating; Naturally cooling obtained the PVD chromium based ceramic composite coating piston ring after preparation finished.
6. the preparation method of PVD chromium based ceramic composite coating piston ring according to claim 5, it is characterized in that: aura cleans under 400～450 ℃, ar gas environment and carries out, bias voltage in the glow discharging process on the workpiece is-800V～-1200V, the aura time is 30～60 minutes.
7. the preparation method of PVD chromium based ceramic composite coating piston ring according to claim 5 is characterized in that: adhesive layer thickness is 100～200 nanometers.
8. the preparation method of PVD chromium based ceramic composite coating piston ring according to claim 5, it is characterized in that: main wearing layer thickness is 10～20 microns, alternately be made of 2 to 4 layers of Cr layer and CrN layer, the thickness of every layer of Cr is 100～200 nanometers, and the thickness of every layer of CrN is 4～5 microns.
9. the preparation method of PVD chromium based ceramic composite coating piston ring according to claim 5, it is characterized in that: anti-attrition layer thickness is 5～10 microns, by 2 to 5 layers of Cr layer and Cr
2O
3Layer alternately consists of, and the thickness of every layer of Cr is 100～200 nanometers, every layer of Cr
2O
3Thickness be 1～3 micron.
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