CN206783746U - A kind of boron cast-iron cylinder jacket scrapes carbocyclic ring coating - Google Patents

Abstract

The utility model discloses a kind of boron cast-iron cylinder jacket to scrape carbocyclic ring coating, belongs to the technical field of improvement of cylinder jacket.A kind of boron cast-iron cylinder jacket of the present utility model scrapes carbocyclic ring coating, is arranged at the neck of cylinder jacket, and the composition for scraping carbocyclic ring coating is NiCr Cr₃C₂Composite coating, NiCr alloys have the performances such as excellent heat-resisting, corrosion-resistant, resistance to high temperature oxidation, also act as the effect of Binder Phase, Cr₃C₂With preferable high temperature hardness and high temperature oxidation resistance, play hard phase.The composition of cylinder jacket is boron cast iron, boron cast iron, i.e., boron is added in gray cast iron, the boracic cementite of varying number or the cast iron of ledeburite organization can be obtained in metallographic structure, with the increase of Boron contents, microhardness increase, but too high boron, which add, will also result in toughness reduction.The utility model can solve the problem that piston face easily accumulates a large amount of carbon deposits, scrapes carbocyclic ring accessory and the problems such as structure hardness itself is low, fragile be present.

Description

A kind of boron cast-iron cylinder jacket scrapes carbocyclic ring coating

Technical field

The technical field of improvement of cylinder jacket is the utility model is related to, more particularly to a kind of boron cast-iron cylinder jacket scrapes carbocyclic ring painting Layer.

Background technology

As engine power lifting and run time extend, especially with the diesel engine of heavy oil, with cylinder jacket The piston face of cooperation easily accumulates a large amount of carbon deposits, and on the one hand the carbon deposit of these accumulation have impact on the stable operation of engine, separately On the one hand cause the rapid rising of lubrication oil consumption, and then lift operating cost, scrape carbocyclic ring technology in this context and arise at the historic moment. In the prior art, set in cylinder jacket and scrape carbocyclic ring and mainly there are two class formation forms, one kind is by the suitable position in cylinder jacket Put spraying composite material formed scrape carbocyclic ring, another be design individually with cylinder jacket it is supporting scrape carbocyclic ring accessory.Spray work Prepared by skill scrapes carbocyclic ring due to higher for composite requirement, the defects of plus structure itself, apply at present more It is limited.And it is individually designed scrape carbocyclic ring accessory, it is more close due to coordinating with cylinder jacket, and be easily changed and repair, thus be At present piston face remove carbon major way, therefore, the design that cylinder jacket scrapes carbocyclic ring be reduce component wear, save lubricating oil into One of this effective ways, but carbocyclic ring accessory of the prior art of scraping has that structure hardness itself is low, flimsy defect, because And extremely it is necessary the formula to scraping carbocyclic ring and preparation technology progress suitably research and improvement.

Sadangi of Rutger universities of the U.S. et al. utilizes " spray drying → reduction decomposition → gas carburization " technique to prepare Granularity is 0.6 μm of Cr₃C₂Powder (referring to R.K.Sadangi, L.E.McCandlish, B.H.Kear, P.Seegopaul.Synthesisandcharacterizationofsubmicronvanadiumandchromiumcarbide Graingrowthin hibitors.AdvancesinPowderMetallurgy＆ParticularMaterials, 1998： P9-P15).Its technical process is：The precursor solution containing Cr is prepared first, is then spray-dried, then by spray drying Powder is pyrolyzed, and the product after pyrolysis is carried out into gas carburization with CH4/H2 mixed gas.Subject matter existing for this method It is that technique is more complicated, and the granularity of obtained chromium carbide powder is bigger than normal, it is impossible to meet chromium carbide powder in modern industry Using.

Through retrieval, Chinese patent application, publication number：CN105803302A, publication date：2016.07.27, one kind is disclosed Scrape carbocyclic ring and preparation method thereof.This is scraped carbocyclic ring and is prepared using centrifugal casting technique, and by weight percentage, this scrapes carbocyclic ring Chemical composition is specially：Carbon 2.6~3.0%, silicon 1.7~2.2%；Phosphorus 0.25~0.5%, sulphur ＜ 0.1%, manganese 0.5~ 1.0%th, boron 0.25~0.5%, copper 0.3~0.6%, chromium ＜ 0.2%, molybdenum 0.3~0.7%, nickel 0.3~0.6%；Surplus is Fe.What the invention was provided, which scrapes carbocyclic ring, has the advantages that with short production cycle, cost is low, tensile strength is high, Preliminary Applications experiment table It is bright, piston face carbon deposit can be preferably removed, reduces lubrication oil consumption, but the carbocyclic ring of scraping of the invention uses centrifugal casting technique system Make, and cylinder jacket is to contact firmly, overload is in use, easily damaging mutually and shortening the service life of both sides.

Utility model content

1. utility model technical problems to be solved

Deposited for easily accumulating a large amount of carbon deposits in the presence of the piston face coordinated with cylinder jacket in the prior art, scraping carbocyclic ring accessory Structure hardness itself is low, fragile the problems such as, the utility model provides a kind of boron cast-iron cylinder jacket and scrapes carbocyclic ring coating.It is logical Optimization coating composition and distribution are crossed, there are good liquid zinc corrosion resistant, abrasion resistance properties, and reached raising coating and cylinder jacket The purpose of the bond strength of basic unit.

2. technical scheme

To reach above-mentioned purpose, technical scheme provided by the utility model is：

A kind of boron cast-iron cylinder jacket scrapes carbocyclic ring coating, is arranged at the neck of cylinder jacket, it is described scrape carbocyclic ring coating composition be NiCr-Cr₃C₂Composite coating, NiCr alloys have the performances such as excellent heat-resisting, corrosion-resistant, resistance to high temperature oxidation, also act as Binder Phase Effect, Cr₃C₂With preferable high temperature hardness and high temperature oxidation resistance, play hard phase, also primarily serve in the coating The effect of second phase particles dispersion-strengtherning, it can solve the problem that cylinder jacket inner carrier surface easily accumulates a large amount of carbon deposits, scrapes carbocyclic ring accessory The problems such as structure hardness itself is low, fragile be present.Moreover, NiCr-Cr₃C₂With with cylinder jacket similar in linear expansion coefficient, from And can substantially reduce because thermal shock and caused by disbonding in addition fail, so as to solve technical problem of the present utility model. The composition of the cylinder jacket is boron cast iron, boron cast iron, i.e., boron is added in gray cast iron, and varying number can be obtained in metallographic structure Boracic cementite or ledeburite organization cast iron, with the increase of Boron contents, microhardness increase, but too high boron is added and also can Toughness is caused to reduce.Inventor is by contrast test discovery, boron cast iron and NiCr-Cr₃C₂Composite coating has stronger affine Power, therefore, both can act synergistically, and improve bond strength between the two.

Further technical scheme, NiCr-Cr₃C₂Composite coating thickness is 400~500 μm, and cylinder jacket, which coats, scrapes carbocyclic ring Afterwards, its internal diameter is generally smaller than cylinder sleeve 400~500 μm, thus, stairstepping is formed in cylinder sleeve；Each car of its upper and lower has withdrawing Groove, centre form and scrape carbocyclic ring cutting edge, and piston crown carbon distribution is constantly scraped in reciprocatory movement by the edge of a knife, it is impossible to are formed thick Carbon distribution, the carbon distribution scraped blown away by exhaust immediately, and the oil film of cylinder liner surface is not destroyed, and cylinder liner-piston group keeps good Lubricating status, therefore, the abrasion of cylinder liner-piston group can be substantially reduced, and it is kept sealing state for a long time.

Further technical scheme, the content of boron is 0.05~0.12% in boron cast iron, can be obtained not in metallographic structure With the boracic cementite of quantity or the cast iron of ledeburite organization, with the increase of Boron contents, microhardness increase, but too high boron Addition will also result in toughness reduction, and the restriction scope is inventor according to NiCr-Cr₃C₂The use of composite coating, overcoming can only The technology prejudice of addition 0.03~0.08%, inventor have found the addition even more than 0.08%, the service life of cylinder jacket More preferable on the contrary with addition of the using effect compared to less than 0.08%, service life improves 50-70%；The NiCr-Cr₃C₂ In composite coating, Cr₃C₂Content is that 70~80%, NiCr is 20~30%, the NiCr tack coats of the two percentage ranges with NiCr-Cr₃C₂Cermet has preferable mutual fusibleness, wherein Cr₃C₂Content is mostly 80%, NiCr 20%, subsequently through resistance to The detection of the characterizing methods such as mill property, can be proved to be optimal proportion.

A kind of boron cast-iron cylinder jacket scrapes the preparation method of carbocyclic ring coating, wherein, the Cr₃C₂Preparation method be：

Step 1：Mixing：Ammonium dichromate powder and nanometer carbon black powder are placed in distilled water or deionized water, mixing is stirred It is in uniformly flow-like to mix, and it is in presoma to add compressing in mould；In bulk after compacting, anxious jelly is carried out to facilitate；

Step 2：It is anxious to freeze：Presoma is quickly transferred to anxious freeze in space and carries out anxious jelly；The purpose suddenly frozen is as short as possible Time in allow fluid freeze, ammonium dichromate powder and nanometer carbon black powder to be positioned rapidly after stirring, to prevent stops shape stream Body is layered due to the difference of density, causes the skewness of chromium source and carbon source after follow-up frozen dried, and causes carburizing reagent Unbalanced adverse consequences；

Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, after freezing Blocks is the more micropore shape honeycomb blocks formed after hydrone distils, and Volume Changes are small, uniform chromium source and carbon source positioning It will not change, moreover, in freeze-drying process, following reaction occurs in drying process for ammonium dichromate powder at low temperature：

(NH₄)₂Cr₂O₇(s)=Cr₂O₃(s)+N₂↑+4H₂O(2-1)

Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, with the rise of temperature, carbon is gradually by the high price oxygen of chromium Compound is reduced into the low oxide of chromium, and the carbon source that position is fixed with its peripheral location also reacted by relatively-stationary chromium source, Uniform chromium carbide is ultimately generated, but also is nano level chromium carbide；Due to freezing the uniformity of rear blocks micropore, The absorption of heat is also than more uniform in reaction, so as to realize the purpose of obtained even-grained nano level chromium carbide；

3Cr₂O₃(s)+13C (s)=2Cr₃C₂(s)+9CO(2-2)；

3(NH₄)₂Cr₂O₇(s)+13C (s)=2Cr₃C₂(s)+9CO+12H₂O+3N₂↑ (2-3) (W-response process).

Further preparation method, in step 1, the proportioning of ammonium dichromate and nanometer carbon black powder is 1：(0.17~ 0.21), to prevent the excessive residual in blocking source or chromium source；Distilled water or deionized water dosage are：The 55%~60% of powder gross weight, It is suitable fluid completed state scope for uniform mixing for ammonium dichromate and nanometer carbon black powder；It is anxious in step 2 It is -100~-140 DEG C to freeze temperature, and the time is 30~150min, to reach the rapid and thorough effect for forming blocks；Step In four, 900~1200 DEG C of progress carbonizing reductions are warming up to.

Further preparation method, in step 3, lyophilized technique curve is：

A, initial stage：0 DEG C~100 DEG C of plate temperature, 2 DEG C/min of heating slope, 100 DEG C are kept for 30~40 minutes, are evacuated to Within 60Pa；

B, mid-term：Plate temperature is cooled to 80~85 DEG C/min, is kept for 50~60 minutes, vacuum control is within 100Pa；

C, later stage, plate temperature are cooled to 50~65 DEG C/min, are kept for 80~200 minutes, vacuum control is within 80Pa.

In freeze-drying process, the relative low temperature state of material is kept, prevents that reaction is excessively strong and causes to react uneven；

A kind of boron cast-iron cylinder jacket scrapes the spraying method of carbocyclic ring coating, and step is：

Step 1) pre-treatment：Purified treatment is carried out to the position that needs spray, frock has been refilled, non-spraying face is hidden Protection is covered, corresponding site is roughened on special turntable afterwards；

Step 2) sprays：Sprayed with HVOF methods, due to the present invention multi-element alloy coat in various composition, Nano level granularity can be made, therefore, sprayed with HVOF (supersonic spray coating) method, effect is more obvious, obtained Alloy coat adhesive force is stronger, and the porosity of coating is smaller；

Step 3) is polished：Design size is machined to grinding machine mill；

Step 4) sealing of hole：Sealing of hole is carried out with inorganic silicate hole sealing agent.

Further spraying method, in purified treatment, polish and substrate surface is entered using 800#~1000# carborundum papers Row polishing, with washes of absolute alcohol, acetone degreasing；Interior surface of cylinder liner is mechanical grinding to Sa3 level cleannes；

Further spraying method, carries out blasting treatment after purified treatment again, blasting treatment using particle diameter be 0.1~ 0.5mm iron-sands are abrasive particle, and compressed air pressure ＞ 0.8MPa, sandblasting distance is 80~100mm, and sandblasting angle is 20 °, makes essence Rugosity reaches RZ40~70 μm.

Further spraying method, in addition to step 3)：After cooling laser remolten PROCESS FOR TREATMENT, laser are carried out with laser Power is 900~1000W, and sweep speed is 550~600mm/min, 10 × 3mm of spot size.

3. beneficial effect

Using technical scheme provided by the utility model, compared with prior art, have the advantages that：

(1) a kind of boron cast-iron cylinder jacket of the present utility model scrapes carbocyclic ring coating, and the composition of cylinder jacket is boron cast iron, and boron is cast Iron, i.e., boron is added in gray cast iron, the boracic cementite of varying number or the casting of ledeburite organization can be obtained in metallographic structure Iron, with the increase of Boron contents, microhardness increase, but too high boron, which add, will also result in toughness reduction.Scrape carbocyclic ring coating into It is divided into NiCr-Cr₃C₂Composite coating, NiCr alloys have the performances such as excellent heat-resisting, corrosion-resistant, resistance to high temperature oxidation, also acted as The effect of Binder Phase, Cr₃C₂With preferable high temperature hardness and high temperature oxidation resistance, play hard phase, it is also main in the coating Play a part of second phase particles dispersion-strengtherning, can solve the problem that cylinder jacket was easily lost under high temperature complex working condition, using the longevity Order the problem of relatively low.Moreover, NiCr-Cr₃C₂With with cylinder jacket similar in linear expansion coefficient, so as to substantially reduce because heat rush Hit and caused by disbonding in addition fail, so as to solve technical problem of the present utility model；Inventor passes through contrast test It was found that boron cast iron and NiCr-Cr₃C₂Composite coating has stronger affinity, and therefore, both can act synergistically, and improves both Between bond strength, it might even be possible to improve the addition of boron；

(2) a kind of boron cast-iron cylinder jacket of the present utility model scrapes carbocyclic ring coating, cylinder sleeve coats scrape carbocyclic ring after, its internal diameter It is generally smaller than cylinder sleeve, thus, stairstepping is formed in cylinder sleeve；Each car of its upper and lower has escape, and centre forms and scrapes carbocyclic ring cutting edge, Piston crown carbon distribution is constantly scraped in reciprocatory movement by the edge of a knife, it is impossible to forms the carbon distribution of thickness, the carbon distribution scraped is immediately Blown away by exhaust, the oil film of cylinder liner surface is not destroyed, and cylinder liner-piston group keeps good lubricating status, therefore, Ke Yi great It is big to reduce the abrasion of cylinder liner-piston group, and it is kept sealing state for a long time；

(3) a kind of boron cast-iron cylinder jacket of the present utility model scrapes carbocyclic ring coating, and with the increase of Boron contents, microhardness increases Add, but too high boron adds and will also result in toughness reduction, and the restriction scope is inventor according to NiCr-Cr₃C₂Composite coating makes With, overcome can only add 0.03~0.08% technology prejudice, inventor has found addition even more than 0.08%, cylinder The addition of service life and using effect compared to less than 0.08% of set is more preferable on the contrary, and service life improves 50-70%； Cr₃C₂Content is that 70~80%, NiCr is 20~30%, the NiCr tack coats and NiCr- that the two percentage ranges limit Cr₃C₂Cermet has preferable mutual fusibleness, wherein Cr₃C₂Content is mostly 80%, NiCr 20%, subsequently through wearability Deng the detection of characterizing method, optimal proportion can be proved to be；

(4) a kind of boron cast-iron cylinder jacket of the present utility model scrapes the preparation method of carbocyclic ring coating, especially Cr₃C₂It is lyophilized Its preparation process, it is lyophilized after forerunner's blocks be the more micropore shape honeycomb blocks formed after hydrone distillation, Volume Changes Small, uniform chromium source and carbon source positioning will not change, and the carbon source and its peripheral location that position is fixed are also relatively-stationary Chromium source is reacted, and ultimately generates uniform chromium carbide, but also is nano level chromium carbide；Due to lyophilized rear blocks micropore The uniformity of hole, the absorption of heat is also than more uniform in reaction, so as to realize obtained even-grained nano level chromium carbide Purpose；

(5) a kind of boron cast-iron cylinder jacket of the present utility model scrapes the preparation method of carbocyclic ring coating, the use of lyophilized technique, makes The proportioning of ammonium dichromate and nanometer carbon black powder limits scope and can accurately determined as far as possible according to chemical equation, avoids Excessive impurity, the excessive residual of carbon source or chromium source can be prevented and influence film quality；

(6) a kind of boron cast-iron cylinder jacket of the present utility model scrapes the preparation method of carbocyclic ring coating, in freeze-drying process, heating plate The scope of temperature limits, and can keep the relative low temperature state (being less than heating plate temperature) of material, prevents that reaction is excessively strong and leads Cause reaction uneven；

(7) a kind of boron cast-iron cylinder jacket of the present utility model scrapes the spraying method of carbocyclic ring coating, is sprayed with HVOF methods Apply, due to the various composition in the multi-element alloy coat of the present invention, nano level granularity can be made, it is therefore, (super with HVOF Velocity of sound sprays) method sprayed, and effect is more obvious, and obtained alloy coat adhesive force is stronger, and the porosity of coating is smaller；

(8) a kind of boron cast-iron cylinder jacket of the present utility model scrapes the spraying method of carbocyclic ring coating, sprays pre-treatment and spray Various technological parameters in painting, be that inventor combines nanoscale powder material produced by the present invention, carried out various data acquisitions, Obtained on the basis of the creative works such as analysis, summary, the intensity of obtained coating reaches more than 80MPa, and hardness reaches More than 1200HV, porosity is below 1%, moreover, in hardness test：NiCr/Cr3C2-20NiCr coatings are by interface to surface layer table Face, microhardness are stepped up, up to 1363.3HV；

(9) a kind of boron cast-iron cylinder jacket of the present utility model scrapes carbocyclic ring coating, in use, substantially prolongs cylinder sleeve With the service life of piston ring；Combustion blow-by substantially is prevented, reduces to pollution degree of lubricating oil, reduces lubricating oil Consumption；Because pollution degree of lubricating oil is small, extend accordingly from the oil circuit accessory such as clear cleaner service life, cleaning work Amount is reduced, and maintenance cost reduces；The abrasion of the various bearings of diesel engine is reduced, extends the service life of unit；

(10) a kind of boron cast-iron cylinder jacket of the present utility model scrapes the spraying method of carbocyclic ring coating, and laser remolten technique can make Coating forms metallurgical binding with base material, and the metallographic structure of its alloy-layer has fine and closely woven needle-like or dendritic eutectic structure, improves The affinity of metallic atom, and then further increase coating and base material combination degree.

Brief description of the drawings

Fig. 1 is that boron cast-iron cylinder jacket of the present utility model scrapes structural representation after the amplification of carbocyclic ring coating；

Fig. 2 is the NiCr/1Cr13 coatings cross-section microhardness distribution figures of comparative example in embodiment；

Fig. 3 is Cr of the present utility model₃C₂- 20NiCr coatings cross-section microhardness distribution figures；

Fig. 4 is coating cross sections microhardness distribution statistical chart.

In figure：1st, cylinder jacket；2nd, carbocyclic ring coating is scraped；21st, carbocyclic ring cutting edge is scraped；22nd, escape.

Embodiment

To further appreciate that content of the present utility model, (note is described in detail to the utility model with reference to accompanying drawing：It is such as not special Not Zhu Ming, content is expressed as weight content in embodiment).

Embodiment 1

The boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating 2, as shown in figure 1, the neck of cylinder jacket 1 is arranged at, it is described The composition for scraping carbocyclic ring coating 2 is NiCr-Cr₃C₂Composite coating, NiCr alloys have excellent heat-resisting, corrosion-resistant, resistance to high temperature oxidation Etc. performance, the effect of Binder Phase is also acted as, Cr₃C₂With preferable high temperature hardness and high temperature oxidation resistance, the work of a hard phase With also primarily serving the effect of second phase particles dispersion-strengtherning in the coating, can solve the problem that cylinder jacket 1 under high temperature complex working condition Easily loss, the problem of service life is relatively low.Moreover, NiCr-Cr₃C₂With with cylinder jacket 1 similar in linear expansion coefficient, so as to Can substantially reduce because thermal shock and caused by disbonding in addition fail, so as to solve technical problem of the present utility model.Institute The composition for stating cylinder jacket 1 is boron cast iron, boron cast iron, i.e., boron is added in gray cast iron, varying number can be obtained in metallographic structure Boracic cementite or ledeburite organization cast iron, with the increase of Boron contents, microhardness increase, but too high boron is added and also can Toughness is caused to reduce.Inventor is by contrast test discovery, boron cast iron and NiCr-Cr₃C₂Composite coating has stronger affine Power, therefore, both can act synergistically, and improve bond strength between the two.

The boron cast-iron cylinder jacket of the present embodiment scrapes the preparation of carbocyclic ring coating material：NiCr-Cr₃C₂Mix nano powder；

A kind of boron cast-iron cylinder jacket of the present embodiment scrapes the spraying method of carbocyclic ring coating, and step is：

Step 1) pre-treatment：Purified treatment is carried out to the position that needs spray, frock has been refilled, non-spraying face is hidden Protection is covered, corresponding site is roughened on special turntable afterwards；

Step 2) sprays：Sprayed with HVOF methods, due to the present invention multi-element alloy coat in various composition, Nano level granularity can be made, therefore, sprayed with HVOF (supersonic spray coating) method, effect is more obvious, obtained Alloy coat adhesive force is stronger, and the porosity of coating is smaller；

Step 3) is polished：Design size is machined to grinding machine mill；

Step 4) sealing of hole：Sealing of hole is carried out with inorganic silicate hole sealing agent.

Embodiment 2

The boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating, and basic structure exists with embodiment 1, different and improvements In： NiCr-Cr₃C₂Composite coating thickness be 400 μm, cylinder jacket 1 coats scrape carbocyclic ring coating 2 after, its internal diameter generally compares cylinder Cover it is small 400 μm, thus, stairstepping is formed in cylinder sleeve；Each car of its upper and lower has escape 22, and centre forms and scrapes carbocyclic ring cutting edge 21, Piston crown carbon distribution is constantly scraped in reciprocatory movement by the edge of a knife, it is impossible to forms the carbon distribution of thickness, the carbon distribution scraped is immediately Blown away by exhaust, the oil film of cylinder liner surface is not destroyed, and cylinder liner-piston group keeps good lubricating status, therefore, Ke Yi great It is big to reduce the abrasion of cylinder liner-piston group, and it is kept sealing state for a long time.

Embodiment 3

The boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating, and basic structure exists with embodiment 1, different and improvements In：The content of boron is 0.05% in boron cast iron；NiCr-Cr₃C₂Composite coating thickness is 500 μm, Cr₃C₂Content is 70%, NiCr For 30%.

The boron cast-iron cylinder jacket of the present embodiment scrapes the preparation of carbocyclic ring coating material：NiCr-Cr₃C₂Nano powder is mixed, wherein, receive Rice Cr₃C₂The preparation method of powder is：

Step 1：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.17 proportioning is placed in powder In the distilled water of gross weight 55%, it is mixed evenly in flow-like, it is in presoma to add compressing in square dies；Compacting Afterwards in bulk, anxious jelly is carried out to facilitate；

Step 2：It is anxious to freeze：Presoma is quickly transferred to -100 DEG C of anxious freeze in space and carries out anxious jelly 150min；The purpose suddenly frozen It is to allow fluid freeze, ammonium dichromate powder and nanometer carbon black powder to be positioned rapidly after stirring in the time as short as possible, To prevent block fluid to be layered due to the difference of density, the skewness of chromium source and carbon source after follow-up frozen dried is caused；

Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, plate temperature control system Below 100 DEG C, the blocks after freezing is the more micropore shape honeycomb blocks formed after hydrone distils, and Volume Changes are small, Uniform chromium source and carbon source positioning will not change, moreover, in freeze-drying process, ammonium dichromate powder drying process at low temperature It is middle that following reaction occurs：

(NH₄)₂Cr₂O₇(s)=Cr₂O₃(s)+N₂↑+4H₂O(2-1)

Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, with the rise of temperature, carbon is gradually by the high price oxygen of chromium Compound is reduced into the low oxide of chromium, and the carbon source that position is fixed with its peripheral location also reacted by relatively-stationary chromium source, Uniform chromium carbide is ultimately generated, but also is nano level chromium carbide；Due to freezing the uniformity of rear blocks micropore, The absorption of heat is also than more uniform in reaction, so as to realize the purpose of obtained even-grained nano level chromium carbide；

3Cr₂O₃(s)+13C (s)=2Cr₃C₂(s)+9CO (2-2) (carburizing reagent)；

3(NH₄)₂Cr₂O₇(s)+13C (s)=2Cr₃C₂(s)+9CO+12H₂O+3N₂↑ (2-3) (W-response process)

A kind of boron cast-iron cylinder jacket of the present embodiment scrapes the spraying method of carbocyclic ring coating, and step is：

Step 1) pre-treatment：By cylinder-barrel surface mechanical grinding, polishing is using 800#~1000# carborundum papers to base material Surface is polished, with washes of absolute alcohol, acetone degreasing；Cylinder-barrel surface is mechanical grinding at least Sa3 levels cleannes；Afterwards Blasting treatment, the use of particle diameter is that 0.1mm iron-sands are abrasive particle, compressed air pressure 1.0MPa, sandblasting distance is 80mm, sandblasting angle Spend for 20 °, smart rugosity is reached RZ40 μm；

Step 2) sprays：Sprayed with HVOF methods：

NiCr-Cr₃C₂Spraying method parameter be：Oxygen flow：55SCFH；Kerosene oil flow：22LPH；Spray distance 360mm。

A kind of boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating, after testing：

Anchoring strength of coating is tested：According to the assay method of GB/T8642-2002 thermal spraying resisting binding strengths：It is obtained The intensity of coating reaches 89MPa；

Coating hardness is analyzed：Being measured using Vickers, hardness reaches more than 1200HV,

Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and drying process Specimen surface.Test solution in paste penetrates into coating porosity, is acted on parent metal, spot of the generation with characteristic color, right Coloured speckle number is counted on lotion, you can is obtained coating porosity, is measured porosity 0.77%；

High temperature resistant property：It it is 20 times of No. 10 steel in 800 DEG C of antioxygenic properties, can effectively improve boron cast iron uses the longevity Life.

Embodiment 4

The boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating, and basic structure exists with embodiment 1, different and improvements In：The content of boron is 0.07% in boron cast iron；NiCr-Cr₃C₂Composite coating thickness is 450 μm, Cr₃C₂Content is 75%, NiCr For 25%.

The boron cast-iron cylinder jacket of the present embodiment scrapes the preparation of carbocyclic ring coating material：NiCr-Cr₃C₂Nano powder is mixed, wherein, receive Rice Cr₃C₂The preparation method of powder is：

Step 1：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.21 proportioning is placed in powder In the distilled water of gross weight 60%, it is mixed evenly in flow-like, it is in presoma to add compressing in square dies；With In bulk after the compacting of 2Mpa pressure, it is 3cm to be depressed into thickness, and anxious jelly is carried out to facilitate；

Step 2：It is anxious to freeze：Presoma is quickly transferred to -140 DEG C of anxious freeze in space and carries out anxious jelly 30min；

Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, lyophilized technique Curve is：

A, initial stage：0 DEG C~100 DEG C of plate temperature, heating slope 2 DEG C/min, 100 DEG C are kept for 30 minutes, be evacuated to 60Pa with It is interior；

B, mid-term：Plate temperature is cooled to 80 DEG C/min, is kept for 60 minutes, vacuum control is within 100Pa；

C, later stage, plate temperature are cooled to 50 DEG C/min, are kept for 200 minutes, vacuum control is within 80Pa.

Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated, 1200 DEG C are warming up in 30 minutes to keep being cooled to 1100 DEG C in 30 minutes, 10 minutes and keeping again 40 minutes, are dropped again in 10 minutes Temperature is cooled to 900 DEG C in 20 minutes, 10 minutes to 1000 DEG C of insulations and kept for 10 minutes again, is the advantages of this stage cooling, The stability of reaction is kept, and then the uniformity of carburizing reagent can be ensured and realized the more uniform nanoscale of granularity is made Chromium carbide, detected through SEM ESEMs, particle size is about between 35-40nm, and granularity gap is smaller.

A kind of boron cast-iron cylinder jacket of the present embodiment scrapes the spraying method of carbocyclic ring coating, and step is：

Step 1) pre-treatment：By cylinder-barrel surface mechanical grinding, polish and substrate surface is entered using 1000# carborundum papers Row polishing, with washes of absolute alcohol, acetone degreasing；Cylinder-barrel surface is mechanical grinding at least Sa3 levels cleannes；Afterwards at sandblasting Reason, the use of particle diameter is that 0.5mm iron-sands are abrasive particle, compressed air pressure 1.2MPa, sandblasting distance is 100mm, and sandblasting angle is 20 °, smart rugosity is set to reach RZ70 μm；Frock has been refilled, masking protection has been carried out to non-spraying face, afterwards to phase on special turntable Position is answered to be roughened；

Step 2) sprays：Sprayed with HVOF methods：

NiCr-Cr₃C₂Spraying method parameter be：Oxygen flow：57SCFH；Kerosene oil flow：21LPH；Spray distance 370mm；

Step 3) is polished：Design size is machined to grinding machine mill；

Step 4) sealing of hole：Sealing of hole is carried out with inorganic silicate hole sealing agent.

A kind of boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating, after testing：

Anchoring strength of coating is tested：According to the assay method of GB/T8642-2002 thermal spraying resisting binding strengths：It is obtained The intensity of coating reaches 97MPa；

Coating hardness is analyzed：Being measured using Vickers, hardness reaches more than 1300HV,

Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and drying process Specimen surface.Test solution in paste penetrates into coating porosity, is acted on parent metal, spot of the generation with characteristic color, right Coloured speckle number is counted on lotion, you can is obtained coating porosity, is measured porosity 0.67%；

High temperature resistant property：It it is 25 times of No. 10 steel in 800 DEG C of antioxygenic properties, can effectively improve boron cast iron uses the longevity Life.

During detection, inventor is investigated thermal shock resistance of the coating under 500 DEG C of (every 10min quenchings once) hot conditions Can, NiCr/Cr3C2-25NiCr coatings are through more than 50 circulations without peeling off.

Strength test：Using E-7 glue as binding agent, carry out stretching experiment after solidification, with 0.1mm/min rate tensiles, When tensile strength is 97.5MPa, bonding sample is broken, and the plane of disruption is in glued layer, shows that anchoring strength of coating is more than 97.5MPa。

Embodiment 5

The boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating, and basic structure exists with embodiment 1, different and improvements In：The content of boron is 0.09% in boron cast iron；NiCr-Cr₃C₂Composite coating thickness is 460 μm, Cr₃C₂Content is 80%, NiCr For 20%.

The boron cast-iron cylinder jacket of the present embodiment scrapes the preparation of carbocyclic ring coating material：NiCr-Cr₃C₂Nano powder is mixed, wherein, receive Rice Cr₃C₂The preparation method of powder is：

Step 1：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.19 proportioning is placed in powder In the distilled water of gross weight 60%, it is mixed evenly in flow-like, it is in presoma to add compressing in square dies；With In bulk after the compacting of 1.2Mpa pressure, it is 2cm to be depressed into thickness, and anxious jelly is carried out to facilitate；

Step 2：It is anxious to freeze：Presoma is quickly transferred to -120 DEG C of anxious freeze in space and carries out anxious jelly 80min；

Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, lyophilized technique Curve is：

A, initial stage：0 DEG C~100 DEG C of plate temperature, heating slope 2 DEG C/min, 100 DEG C are kept for 40 minutes, be evacuated to 60Pa with It is interior；

B, mid-term：Plate temperature is cooled to 85 DEG C/min, is kept for 50 minutes, vacuum control is within 100Pa；

C, later stage, plate temperature are cooled to 55 DEG C/min, are kept for 120 minutes, vacuum control is within 80Pa.

Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated, 1200 DEG C are warming up in 40 minutes to keep being cooled to 1100 DEG C in 25 minutes, 10 minutes and keeping again 45 minutes, are dropped again in 10 minutes Temperature is cooled to 900 DEG C in 30 minutes, 5 minutes to 1000 DEG C of insulations and kept for 5 minutes again, is to protect the advantages of this stage cooling The stability of reaction is held, and then the uniformity of carburizing reagent can be ensured and realize that obtained granularity is more uniform nano level Chromium carbide, detected through SEM ESEMs, particle size is about between 35-40nm, and granularity gap is smaller.

A kind of boron cast-iron cylinder jacket of the present embodiment scrapes the spraying method of carbocyclic ring coating, and step is：

Step 1) pre-treatment：By cylinder-barrel surface mechanical grinding, polish and substrate surface is entered using 900# carborundum papers Row polishing, with washes of absolute alcohol, acetone degreasing；Cylinder-barrel surface is mechanical grinding at least Sa3 levels cleannes；Afterwards at sandblasting Reason, the use of particle diameter is that 0.25mm iron-sands are abrasive particle, compressed air pressure 1.0MPa, sandblasting distance is 90mm, and sandblasting angle is 20 °, smart rugosity is set to reach RZ50 μm；Frock has been refilled, masking protection has been carried out to non-spraying face, afterwards to phase on special turntable Position is answered to be roughened；

Step 2) sprays：Sprayed with HVOF methods：

NiCr-Cr₃C₂Spraying method parameter be：Oxygen flow：59SCFH；Kerosene oil flow：21LPH；Spray distance 370mm；

Step 3) is polished：Design size is machined to grinding machine mill；

Step 4) sealing of hole：Sealing of hole is carried out with inorganic silicate hole sealing agent.

A kind of boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating, after testing：

Anchoring strength of coating is tested：According to the assay method of GB/T8642-2002 thermal spraying resisting binding strengths：It is obtained The intensity of coating reaches 103.6MPa；

Coating hardness is analyzed：Being measured using Vickers, hardness reaches more than 1350HV,

Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and drying process Specimen surface.Test solution in paste penetrates into coating porosity, is acted on parent metal, spot of the generation with characteristic color, right Coloured speckle number is counted on lotion, you can is obtained coating porosity, is measured porosity 0.61%；

High temperature resistant property：It it is 29 times of No. 10 steel in 800 DEG C of antioxygenic properties, effectively increase boron cast iron uses the longevity Life.

During detection, inventor is investigated thermal shock resistance of the coating under 500 DEG C of (every 10min quenchings once) hot conditions Can, NiCr/Cr3C2-25NiCr coatings are through more than 60 circulations without peeling off.

Strength test：Using E-7 glue as binding agent, carry out stretching experiment after solidification, with 0.1mm/min rate tensiles, When tensile strength is 107.5MPa, bonding sample is broken, and the plane of disruption is in glued layer, shows that anchoring strength of coating is more than 107.5MPa。

Embodiment 6

The boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating, and basic structure exists with embodiment 1, different and improvements In：The content of boron is 0.10% in boron cast iron；NiCr-Cr₃C₂Composite coating thickness is 470 μm, Cr₃C₂Content is 80%, NiCr For 20%.

The boron cast-iron cylinder jacket of the present embodiment scrapes the preparation of carbocyclic ring coating material：NiCr-Cr₃C₂Nano powder is mixed, wherein, receive Rice Cr₃C₂The preparation method of powder is：

Step 1：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.20 proportioning is placed in powder In the distilled water of gross weight 60%, it is mixed evenly in flow-like, it is in presoma to add compressing in square dies；With In bulk after the compacting of 1.4Mpa pressure, it is 2.5cm to be depressed into thickness, and anxious jelly is carried out to facilitate；

Step 2：It is anxious to freeze：Presoma is quickly transferred to -110 DEG C of anxious freeze in space and carries out anxious jelly 90min；

Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, lyophilized technique Curve is：

A, initial stage：0 DEG C~100 DEG C of plate temperature, heating slope 2 DEG C/min, 100 DEG C are kept for 35 minutes, be evacuated to 60Pa with It is interior；

B, mid-term：Plate temperature is cooled to 80 DEG C/min, is kept for 50 minutes, vacuum control is within 100Pa；

C, later stage, plate temperature are cooled to 60 DEG C/min, are kept for 100 minutes, vacuum control is within 80Pa.

Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated, 1200 DEG C are warming up in 40 minutes to keep being cooled to 1100 DEG C in 25 minutes, 10 minutes and keeping again 45 minutes, are dropped again in 10 minutes Temperature is cooled to 900 DEG C in 30 minutes, 5 minutes to 1000 DEG C of insulations and kept for 5 minutes again, is to protect the advantages of this stage cooling The stability of reaction is held, and then the uniformity of carburizing reagent can be ensured and realize that obtained granularity is more uniform nano level Chromium carbide, detected through SEM ESEMs, particle size is about between 30-35nm, and granularity gap is smaller.

A kind of boron cast-iron cylinder jacket of the present embodiment scrapes the spraying method of carbocyclic ring coating, and step is：

Step 1) pre-treatment：By cylinder-barrel surface mechanical grinding, polish and substrate surface is entered using 1100# carborundum papers Row polishing, with washes of absolute alcohol, acetone degreasing；Cylinder-barrel surface is mechanical grinding at least Sa3 levels cleannes；Afterwards at sandblasting Reason, the use of particle diameter is that 0.15mm iron-sands are abrasive particle, compressed air pressure 1.3MPa, sandblasting distance is 80mm, and sandblasting angle is 20 °, smart rugosity is set to reach RZ40 μm；Frock has been refilled, masking protection has been carried out to non-spraying face, afterwards to phase on special turntable Position is answered to be roughened；

Step 2) sprays：Sprayed with HVOF methods：

NiCr-Cr₃C₂Spraying method parameter be：Oxygen flow：60SCFH；Kerosene oil flow：23LPH；Spray distance 390mm；

Step 3) is polished：Design size is machined to grinding machine mill；

Step 4) sealing of hole：Sealing of hole is carried out with inorganic silicate hole sealing agent；

Step 5)：Laser remolten PROCESS FOR TREATMENT, laser power 900W are carried out with laser after cooling, sweep speed is 550mm/min, 10 × 3mm of spot size.

Embodiment 7

Contrast test：NiCr/1Cr13 coatings, granularity, thickness and technological parameter are identical, obtained NiCr/1Cr13 coatings, Using metallography microscope hardness analysis, as shown in Fig. 2 by interface to facing surface, hardness 236.5,271.5,361.2, 525.4、 608.7、844.7。

The boron cast-iron cylinder jacket of the present embodiment 6 scrapes carbocyclic ring coating and uses metallography microscope hardness analysis, as shown in figure 3, by boundary Face to face layer surface, hardness 253.4,334.1,751.2,1004.4,1122.9,1363.3.

It is as shown in Figure 4 that two kinds of coating cross sections hardness multi-point data acquisitions arrange result, it can be seen that of the present utility model NCr₃C₂- 20NiCr coatings are stepped up by interface to facing surface, microhardness, up to 1363.3HV.

Strength test：Using E-7 glue as binding agent, carry out stretching experiment after solidification, with 0.1mm/min rate tensiles, When tensile strength is 115.0MPa, bonding sample is broken, and the plane of disruption is in glued layer, shows that anchoring strength of coating is more than 115.0MPa。

Embodiment 8

The boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating, and basic structure exists with embodiment 1, different and improvements In：The content of boron is 0.11% in boron cast iron；NiCr-Cr₃C₂Composite coating thickness is 480 μm, Cr₃C₂Content is 80%, NiCr For 20%.

The boron cast-iron cylinder jacket of the present embodiment scrapes the preparation of carbocyclic ring coating material：NiCr-Cr₃C₂Nano powder is mixed, wherein, receive Rice Cr₃C₂The preparation method of powder is：

Step 1：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.18 proportioning is placed in powder In the distilled water of gross weight 60%, it is mixed evenly in flow-like, it is in presoma to add compressing in square dies；With In bulk after the compacting of 1.1Mpa pressure, it is 3cm to be depressed into thickness, and anxious jelly is carried out to facilitate；

Step 2：It is anxious to freeze：Presoma is quickly transferred to -130 DEG C of anxious freeze in space and carries out anxious jelly 100min；

Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, lyophilized technique Curve is：

A, initial stage：0 DEG C~100 DEG C of plate temperature, heating slope 2 DEG C/min, 100 DEG C are kept for 40 minutes, be evacuated to 60Pa with It is interior；

B, mid-term：Plate temperature is cooled to 85 DEG C/min, is kept for 50 minutes, vacuum control is within 100Pa；

C, later stage, plate temperature are cooled to 55 DEG C/min, are kept for 120 minutes, vacuum control is within 80Pa.

Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated, 1200 DEG C are warming up in 40 minutes to keep being cooled to 1100 DEG C in 25 minutes, 10 minutes and keeping again 45 minutes, are dropped again in 10 minutes Temperature is cooled to 900 DEG C in 30 minutes, 5 minutes to 1000 DEG C of insulations and kept for 5 minutes again, is to protect the advantages of this stage cooling The stability of reaction is held, and then the uniformity of carburizing reagent can be ensured and realize that obtained granularity is more uniform nano level Chromium carbide, detected through SEM ESEMs, particle size is about between 35-40nm, and granularity gap is smaller.

A kind of boron cast-iron cylinder jacket of the present embodiment scrapes the spraying method of carbocyclic ring coating, and step is：

Step 1) pre-treatment：By cylinder-barrel surface mechanical grinding, polish and substrate surface is entered using 1200# carborundum papers Row polishing, with washes of absolute alcohol, acetone degreasing；Cylinder-barrel surface is mechanical grinding at least Sa3 levels cleannes；Afterwards at sandblasting Reason, the use of particle diameter is that 0.2mm iron-sands are abrasive particle, compressed air pressure 1.1MPa, sandblasting distance is 85mm, and sandblasting angle is 20 °, smart rugosity is set to reach RZ40 μm；Frock has been refilled, masking protection has been carried out to non-spraying face, afterwards to phase on special turntable Position is answered to be roughened；

Step 2) sprays：Sprayed with HVOF methods：

NiCr-Cr₃C₂Spraying method parameter be：Oxygen flow：59SCFH；Kerosene oil flow：21LPH；Spray distance 370mm；

Step 3) is polished：Design size is machined to grinding machine mill；

Step 4) sealing of hole：Sealing of hole is carried out with inorganic silicate hole sealing agent；

Step 5)：Laser remolten PROCESS FOR TREATMENT, laser power 1000W are carried out with laser after cooling, sweep speed is 650mm/min, 10 × 3mm of spot size.

A kind of boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating, after testing：

Anchoring strength of coating is tested：According to the assay method of GB/T8642-2002 thermal spraying resisting binding strengths：It is obtained The intensity of coating reaches 124.4MPa；

Coating hardness is analyzed：Being measured using Vickers, hardness reaches more than 1360HV,

Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and drying process Specimen surface.Test solution in paste penetrates into coating porosity, is acted on parent metal, spot of the generation with characteristic color, right Coloured speckle number is counted on lotion, you can is obtained coating porosity, is measured porosity 0.37%；

High temperature resistant property：It it is 30 times of No. 10 steel in 800 DEG C of antioxygenic properties, effectively increase boron cast iron uses the longevity Life.

Embodiment 9

The boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating, and basic structure exists with embodiment 1, different and improvements In：The content of boron is 0.12% in boron cast iron；NiCr-Cr₃C₂Composite coating thickness is 450 μm, Cr₃C₂Content is 80%, NiCr For 20%.

The boron cast-iron cylinder jacket of the present embodiment scrapes the preparation of carbocyclic ring coating material：NiCr-Cr₃C₂Nano powder is mixed, wherein, receive Rice Cr₃C₂The preparation method of powder is：

Step 1：Mixing：By ammonium dichromate powder and nanometer carbon black powder by weight 1：0.20 proportioning is placed in powder In the distilled water of gross weight 60%, it is mixed evenly in flow-like, it is in presoma to add compressing in square dies；With In bulk after the compacting of 1.4Mpa pressure, it is 2.5cm to be depressed into thickness, and anxious jelly is carried out to facilitate；

Step 2：It is anxious to freeze：Presoma is quickly transferred to -110 DEG C of anxious freeze in space and carries out anxious jelly 90min；

Step 3：It is lyophilized：The anxious presoma frozen is quickly transferred in vacuum freeze drying cabin and freezed, lyophilized technique Curve is：

A, initial stage：0 DEG C~100 DEG C of plate temperature, heating slope 2 DEG C/min, 100 DEG C are kept for 35 minutes, be evacuated to 60Pa with It is interior；

B, mid-term：Plate temperature is cooled to 80 DEG C/min, is kept for 50 minutes, vacuum control is within 100Pa；

C, later stage, plate temperature are cooled to 60 DEG C/min, are kept for 100 minutes, vacuum control is within 80Pa.

Step 4：Carbonization：Vacuum freeze drying cabin cold-trap is closed, using the pattern of stage cooling again after being rapidly heated, 1200 DEG C are warming up in 40 minutes to keep being cooled to 1100 DEG C in 25 minutes, 10 minutes and keeping again 45 minutes, are dropped again in 10 minutes Temperature is cooled to 900 DEG C in 30 minutes, 5 minutes to 1000 DEG C of insulations and kept for 5 minutes again, is to protect the advantages of this stage cooling The stability of reaction is held, and then the uniformity of carburizing reagent can be ensured and realize that obtained granularity is more uniform nano level Chromium carbide, detected through SEM ESEMs, particle size is about between 30-35nm, and granularity gap is smaller.

A kind of boron cast-iron cylinder jacket of the present embodiment scrapes the spraying method of carbocyclic ring coating, with embodiment 9.

A kind of boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating, after testing：

Anchoring strength of coating is tested：According to the assay method of GB/T8642-2002 thermal spraying resisting binding strengths：It is obtained The intensity of coating reaches 128.0MPa；

Coating hardness is analyzed：Being measured using Vickers, hardness reaches more than 1360HV,

Coating porosity is using painting cream method：By the paste even application containing test solution by cleaning and drying process Specimen surface.Test solution in paste penetrates into coating porosity, is acted on parent metal, spot of the generation with characteristic color, right Coloured speckle number is counted on lotion, you can is obtained coating porosity, is measured porosity 0.41%；

High temperature resistant property：It it is 30 times of No. 10 steel in 800 DEG C of antioxygenic properties, effectively increase boron cast iron uses the longevity Life.

Embodiment 10

The boron cast-iron cylinder jacket of the present embodiment scrapes carbocyclic ring coating and its preparation and spraying method, basic structure with embodiment 8, Difference is：Carbocyclic ring coating 2 is scraped to be stepped ring-band shape, the width of escape 22 be scrape the width of carbocyclic ring cutting edge 21 1/8~ 1/10, avoid carbon distribution storage from excessively influenceing the reciprocating motion of piston head, very few memory space is too small；The width of upper and lower escape Spend for 1：1, form uniform carbon distribution temporarily providing room up and down；The width for scraping carbocyclic ring cutting edge 21 is the 1/8~1/ of the diameter of cylinder jacket 1 10.Escape 22 and scrape the intersection of carbocyclic ring cutting edge 21 and have arc-shaped transition, avoid cutting edge from forming piston head excessive damage excessive Carbon distribution.In the present embodiment, 1 a diameter of 320mm of cylinder jacket, the width for scraping carbocyclic ring cutting edge 21 is 40mm, upper and lower escape 22 Width is 5mm.

Step 5)：Laser remolten PROCESS FOR TREATMENT, laser power 950W are carried out with laser after cooling, sweep speed is 600mm/min, 10 × 3mm of spot size.

Schematically the utility model and embodiments thereof are described above, this describes no restricted, accompanying drawing Shown in be also one of embodiment of the present utility model, actual structure is not limited thereto.So if this area Those of ordinary skill enlightened by it, without departing from the spirit of the invention, without creativeness designing with should The similar frame mode of technical scheme and embodiment, all should belong to the scope of protection of the utility model.

Claims (4)

1. a kind of boron cast-iron cylinder jacket scrapes carbocyclic ring coating, the neck of cylinder jacket is arranged at, it is characterised in that described to scrape carbocyclic ring coating Composition be NiCr-Cr₃C₂Composite coating, the composition of the cylinder jacket is boron cast iron.

2. boron cast-iron cylinder jacket according to claim 1 scrapes carbocyclic ring coating, it is characterised in that：The NiCr-Cr₃C₂It is compound Coating layer thickness is 400~500 μm, and each car of its upper and lower has escape, and centre forms and scrapes carbocyclic ring cutting edge.

3. boron cast-iron cylinder jacket according to claim 2 scrapes carbocyclic ring coating, it is characterised in that：Be stepped ring-band shape；Institute It is scrape carbocyclic ring edge width 1/8~1/10 to state withdrawing well width；The width of upper and lower escape is 1：1；Scrape carbocyclic ring cutting edge Width is the 1/8~1/10 of cylinder liner diameter.

4. boron cast-iron cylinder jacket according to claim 2 scrapes carbocyclic ring coating, it is characterised in that：The escape and scrape carbocyclic ring There is arc-shaped transition cutting edge intersection.