CN107937799B - A kind of burr cylinder jacket of centrifugal casting and preparation method thereof - Google Patents
A kind of burr cylinder jacket of centrifugal casting and preparation method thereof Download PDFInfo
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- CN107937799B CN107937799B CN201711293486.2A CN201711293486A CN107937799B CN 107937799 B CN107937799 B CN 107937799B CN 201711293486 A CN201711293486 A CN 201711293486A CN 107937799 B CN107937799 B CN 107937799B
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/004—Cylinder liners
Abstract
A kind of burr cylinder jacket of centrifugal casting and preparation method thereof, belongs to cylinder jacket field, by weight percentage, the chemical composition of burr cylinder jacket are as follows: carbon: 2.8-3.7%；Sulphur: 0.03-0.08%；Silicon: 1.7-2.8%；0 < phosphorus≤0.5%；Manganese: 0.5-1.0%；0 < chromium≤0.4%；Copper: 0.1-0.6%, surplus are iron.A type graphite >=80% or more in cylinder jacket metallographic of the present invention, 4-7 grades of length, matrix is fine pearlite, ferrite is no more than 3%, the quantity of carbide and iron phosphide eutectic is not more than 5%, and the two should be in interrupted net distribution or be uniformly distributed, and mechanical performance meets customer requirement, pipe die inner wall is pulled situation and is significantly reduced, and the service life of mold greatly improves；And cylinder sleeve processing performance improves.
Description
Technical field
The invention belongs to cylinder jacket fields, and in particular to a kind of burr cylinder jacket of centrifugal casting and preparation method thereof.
Background technique
All-aluminium engine has many advantages, such as light-weight, perfect heat-dissipating, in industry by wide popularization and application, still
Its mechanical performance, wear-resisting property, thermal stability etc. are not so good as cast iron.For this purpose, adding cast iron bushing using aluminum cylinder in industry at present
Mode solves the problems, such as this.
The bushing also known as cylinder jacket of cast iron applied to aluminum cylinder, the biggish cylinder jacket of existing market demand is burr gas
Cylinder sleeve.Burr cylinder jacket is directly cast by iron liquid, and the projections collapse point of similar burr, these burrs are distributed in outer surface
The binding force and heating conduction of cylinder jacket and aluminum cylinder can be increased, and then promote the radiating efficiency of engine.
Centrifugal casting production outer wall of cylinder jachet requires have the product of convex burr form, and when production is limited by technique, cylinder
Cover outer wall burr directly and mold contact, cause the cooling velocity of molten iron to be accelerated, molten iron mold-filling capacity is poor, and burr top and
Mold inner-cavity is in close contact, and during subsequent cylinder out, burr is easy to pull mold, causes die life to reduce, cylinder
It covers metallographic structure to be deteriorated, poor processability.
Summary of the invention
The purpose of the present invention is to provide burr cylinder jacket of a kind of centrifugal casting and preparation method thereof.
Based on above-mentioned purpose, the present invention is adopted the following technical scheme that:
A kind of burr cylinder jacket of centrifugal casting, by weight percentage, the chemical composition of burr cylinder jacket are as follows: carbon:
2.8-3.7%；Sulphur: 0.03-0.08%；Silicon: 1.7-2.8%；0 < phosphorus≤0.5%；Manganese: 0.5-1.0%；0 < chromium≤0.4%；Copper:
0.1-0.6%, surplus are iron.
The preparation method of the burr cylinder jacket of above-mentioned centrifugal casting, includes the following steps:
(1) each raw material is accurately weighed, using medium-frequency induction furnace melting, the pretreatment for accounting for iron liquid quality 0.1 ~ 0.2% is added
Agent controls 1500-1550 DEG C of iron liquid tapping temperature；
(2) preparation of coating: by bentonite and water according to 1:(8 ~ 12) mass ratio be mixed and stirred for 10-12 hours,
At least 4 hours are stood after choosing diatomite stirring 1-2 hours of 100kg solution addition 15-20kg, the first coating is made；
(3) the first configured coating is respectively charged into the first coating pressure tank, second of coating is packed into the second coating
Pressurized tank forms uniform cavity with the surface in casting pipe die inner wall, and the pressure of the first coating pressure tank is 0.1-0.2MPa, the
The pressure of two coating pressure tanks is 0.3-0.5MPa；
(4) the casting pipe die of centrifugal casting machine is preheating to 150-450 DEG C, the first painting then is sprayed to casting pipe die
The revolving speed of material, setting casting pipe die is 1000-1300r/min, forms the first layer of 0.05-0.3mm thickness in casting pipe die inner wall
Coating, after first layer coating is dry, to casting pipe die inner-wall spraying second layer coating, the revolving speed for being poured pipe die is 1400 ~
1700 r/min, second layer coating with a thickness of 0.3 ~ 1.1mm, to be coated be completely dried can be poured；
(5) melting qualification iron liquid is poured after inoculation, 1350-1450 DEG C of pouring temperature, pregnant using fair current
It educates, the additional amount of inovulant is casting iron liquid quality 0.4-0.8%, is poured into casting pipe die after molten steel preparation processing, cooling is
Obtain burr cylinder jacket.
Further, the carborundum powder that pretreating agent is granularity 0.2-10mm in the step (1).
Further, -300 mesh of diatomite granularity requirements accounts for 70% or more in the step (2).
Further, the inovulant is silicon strontium inoculant.
After the spraying of the first coating, for coating uniform fold in the inner wall of casting pipe die, which is mainly thermal insulation property
It is good, casting cooling velocity can be slowed down, after second of coating spraying, the heated generation steam of coating forms in coating rapidly uniform
Cavity, then coating surface generates rupture, and it is subsequent that gas overflowing dope layer, which finally generates many holes in coating surface,
The type that fills of casting iron liquid provides space, guarantees that blank surface generates uniform raised burr.The application is used and is poured with same
The two different coatings of spraying in pipe die are infused, while guaranteeing outer wall of cylinder jachet burr formation, casting pipe die is reduced and is led from iron liquid
The heat walked improves the mold-filling capacity of iron liquid, and burr formation is preferable, high uniformity, and metallographic structure is good, and processing performance improves.
Second of the coating that the present invention uses is the masking liquid in patent CN2014108380494, concrete component and system
Standby process is also discussed in detail in patent CN2014108380494.
A type graphite >=80% or more in cylinder jacket metallographic of the present invention, 4-7 grades of length, matrix is fine platy pearl
Body of light, ferrite is no more than 3%, and the quantity of carbide and iron phosphide eutectic is not more than 5%, and the two should be in interrupted net distribution or uniform
Distribution, mechanical performance meet customer requirement, and pipe die inner wall is pulled situation and significantly reduced, and the service life of mold greatly improves；And cylinder
Set processing performance improves.
Detailed description of the invention
Fig. 1 is spraying process schematic diagram of the present invention；1 is the first spray station for spraying trolley, 21 in Fig. 1, and 22 be second
Spray station, 3 be spraying guide rail, and 41 be the first coating pressure tank, and 42 be the second coating pressure tank, and 5 be air accumulator, and 6 be casting
Pipe die guide rail, 7 be casting pipe die；
Fig. 2 is that the casting pipe die of prior art only sprays the amplification of cylinder jacket finished product wear surface graphite prepared by one layer of coating
100 times of photo；As shown in Figure 2, A type graphite 65%, b type eraphite 20%, D type graphite 5%, E type graphite 10%, graphite rank 6-7
Grade；
Fig. 3 is that embodiment 1 is poured 100 times of cylinder jacket finished product wear surface graphite amplification prepared by pipe die spraying two layers of coatings
Photo；From the figure 3, it may be seen that 95% or more A type graphite, 4-6 grades of graphite rank；
Fig. 4 only sprays cylinder jacket finished product wear surface matrix prepared by one layer of coating for the casting pipe die of prior art and puts
Big 100 times of photo；As shown in Figure 4, matrix medium pearlite 94%, ferrite 4%, carbide 2%, pearlite piece spacing are thick piece
Shape；
Fig. 5 is that embodiment 1 is poured cylinder jacket finished product wear surface matrix amplification 100 prepared by pipe die spraying two layers of coatings
Photo again；As shown in Figure 5, matrix medium pearlite is greater than 97%, and pearlite spacing is fine platy.
Specific embodiment
Below in conjunction with specific embodiment, further details of the technical solution of the present invention, but protection model of the invention
It encloses and is not limited thereto.
Embodiment 1
A kind of burr cylinder jacket of centrifugal casting, by weight percentage, the chemistry of burr cylinder jacket provided by this example
Ingredient is as follows:
The preparation method of the burr cylinder jacket of above-mentioned centrifugal casting, includes the following steps:
(1) each raw material is accurately weighed, using medium-frequency induction furnace melting, the carborundum powder for accounting for iron liquid quality 0.1% is added
(0.2 ~ 10mm of granularity) controls 1550 DEG C of iron liquid tapping temperature；
(2) preparation of coating: bentonite and water are mixed according to mass ratio 1:10, after stirring 10 hours, weigh 100kg
Solution is added 16kg diatomite (- 300 mesh account for 70% or more), after being stirred for 1.5 hours, as shown in Figure 1, the coating that will be stirred
It is added in the first coating pressure tank 41, adjustment 41 pressure of the first coating pressure tank is 0.15MPa, by second of preprepared
Coating is added in the second coating pressure tank 42, and the pressure of the second coating pressure tank 42 of adjustment is 0.4MPa；
(3) the casting pipe die 7 of centrifugal casting machine is preheating to 300 DEG C, casting pipe die 7 is moved by being poured pipe die guide rail 7
To the first spray station 21, the revolving speed of centrifugal casting pipe die 7 is 1100r/min, and the spraying rate of spraying trolley 1 is 80mm/s,
A spraying is completed in the movement of spraying guide rail 1 and the rotation of casting pipe die 7 by spraying trolley 1, is formed after spraying 6 times coating
First layer coating, casting pipe die 7 continue to rotate 30-60 seconds after first layer coating is dry, stop the observation of centrifugal casting machine testing
7 inside coating of pipe die is poured with a thickness of 0.12mm, coating surface is smooth, smooth；Casting pipe die 7 is gone into the second spray station
22, the fluffy coating of the starting centrifugal casting machine spraying second layer, the revolving speed of casting pipe die 7 is 1500 r/min, after the completion of spraying
Casting pipe die 7 continues to rotate 70 seconds so that coating is completely dried, and is constantly got angry by inward wall and generates certain hole, the second layer
Coating with a thickness of 0.8mm；
(4) be poured: the mode that will be bred using fair current, which is added, accounts for 0.7% silicon strontium inoculant of iron liquid weight (purchased from Ningxia casting peak spy
Different alloy Co., Ltd) processing iron liquid casting to casting pipe die inner wall, pouring temperature is 1420 DEG C, under the influence of centrifugal force
With the burr that will form uniformly protrusion after crystallisation by cooling in the outer surface of blank.
Sample prepared by the blank of technique production in the past carries out metallographic observation, and as a result for A type graphite amount in 60-80%, graphite is long
5-7 grades, ferrite content 4-5% of degree, iron phosphide eutectic+carbide are not more than 2%(such as Fig. 2 and Fig. 4)；Die life less than 10000,
There have been pull phenomenon for mould inner wall, it is necessary to repair to mold inner hole；Cylinder sleeve chip processing performance experiments have shown that: it is same
Knife is capable of processing 100-150 cylinder sleeve.
Metallographic observation carried out to prepared sample, the pearlite of A type graphite+97% or more of the testing result greater than 95%+
A small amount of ferrite and iron phosphide eutectic, 4-6 grades of graphite size (such as Fig. 3 and Fig. 5)；The service life of mold can reach 18000-20000 only, arrive
Mould inner wall does not also occur pulling phenomenon when mold is scrapped, cylinder sleeve chip processing performance experiments have shown that: it is same that knife is capable of processing
150-200 cylinder sleeve, cylinder sleeve become smaller to the abrasion of cutter, and cylinder sleeve processing performance improves.
Embodiment 2
A kind of burr cylinder jacket of centrifugal casting, by weight percentage, the chemistry of burr cylinder jacket provided by this example
Ingredient is as follows:
The preparation method of the burr cylinder jacket of above-mentioned centrifugal casting, includes the following steps:
(1) each raw material is accurately weighed, using medium-frequency induction furnace melting, the carborundum powder for accounting for iron liquid quality 0.15% is added
(0.2 ~ 10mm of granularity) controls 1500 DEG C of iron liquid tapping temperature；
(2) preparation of coating: bentonite and water are mixed according to mass ratio 1:10, after stirring 11 hours, weigh 100kg
Solution is added 15kg diatomite (- 300 mesh account for 70% or more), after being stirred for 1 hour, as shown in Figure 1, the coating being stirred is added
Enter in the first coating pressure tank 41, adjustment 41 pressure of the first coating pressure tank is 0.1MPa, and second of preprepared is applied
Material is added in the second coating pressure tank 42, and the pressure of the second coating pressure tank 42 of adjustment is 0.3MPa；
(3) the casting pipe die 7 of centrifugal casting machine is preheating to 150 DEG C, casting pipe die 7 is moved by being poured pipe die guide rail 7
To the first spray station 21, the revolving speed of centrifugal casting pipe die 7 is 1000r/min, and the spraying rate of spraying trolley 1 is 80mm/s,
A spraying is completed in the movement of spraying guide rail 1 and the rotation of casting pipe die 7 by spraying trolley 1, is formed after spraying 4 times coating
First layer coating, casting pipe die 7 continue to rotate 30-60 seconds after first layer coating is dry, stop the observation of centrifugal casting machine testing
7 inside coating of pipe die is poured with a thickness of 0.05mm, coating surface is smooth, smooth；Casting pipe die 7 is gone into the second spray station
22, the fluffy coating of the starting centrifugal casting machine spraying second layer, the revolving speed of casting pipe die 7 is 1400 r/min, after the completion of spraying
Casting pipe die 7 continues to rotate 50 seconds so that coating is completely dried, and is constantly got angry by inward wall and generates certain hole, the second layer
Coating with a thickness of 0.3mm；
(4) be poured: the mode that will be bred using fair current, which is added, accounts for 0.4% silicon strontium inoculant of iron liquid weight (purchased from Ningxia casting peak spy
Different alloy Co., Ltd) processing iron liquid casting to casting pipe die inner wall, pouring temperature is 1350 DEG C, under the influence of centrifugal force
With the burr that will form uniformly protrusion after crystallisation by cooling in the outer surface of blank.
Metallographic observation carried out to prepared sample, the pearlite of A type graphite+97% or more of the testing result greater than 90%+
A small amount of ferrite and iron phosphide eutectic, 4-6 grades of graphite size；The service life of mold can reach 18000-20000 only, mould when scrapping to mold
Tool inner wall also do not occur pulling phenomenon, cylinder sleeve chip processing performance experiments have shown that: it is same that knife is capable of processing 150-200 cylinder
Set, cylinder sleeve become smaller to the abrasion of cutter, and cylinder sleeve processing performance improves.
Sample prepared by the blank of technique production in the past carries out metallographic observation, and as a result for A type graphite amount in 60-80%, graphite is long
5-7 grades, ferrite content 4-5% of degree, iron phosphide eutectic+carbide are not more than 5%, and die life, mould inner wall just went out less than 10000
Show and pulled phenomenon, it is necessary to which mold inner hole has been repaired；Cylinder sleeve chip processing performance experiments have shown that: it is same that knife is capable of processing
100-150 cylinder sleeve.
Embodiment 3
A kind of burr cylinder jacket of centrifugal casting, by weight percentage, the chemistry of burr cylinder jacket provided by this example
Ingredient is as follows:
The preparation method of the burr cylinder jacket of above-mentioned centrifugal casting, includes the following steps:
(1) each raw material is accurately weighed, using medium-frequency induction furnace melting, the carborundum powder for accounting for iron liquid quality 0.2% is added
(0.2 ~ 10mm of granularity) controls 1550 DEG C of iron liquid tapping temperature；
(2) preparation of coating: bentonite and water are mixed according to mass ratio 1:10, after stirring 12 hours, weigh 100kg
Solution is added 20kg diatomite (- 300 mesh account for 70% or more), after being stirred for 2 hours, as shown in Figure 1, the coating being stirred is added
Enter in the first coating pressure tank 41, adjustment 41 pressure of the first coating pressure tank is 0.2MPa, and second of preprepared is applied
Material is added in the second coating pressure tank 42, and the pressure of the second coating pressure tank 42 of adjustment is 0.5MPa；
(3) the casting pipe die 7 of centrifugal casting machine is preheating to 450 DEG C, casting pipe die 7 is moved by being poured pipe die guide rail 7
To the first spray station 21, the revolving speed of centrifugal casting pipe die 7 is 1300r/min, and the spraying rate of spraying trolley 1 is 80mm/s,
Spray and form first layer coating after 6 times coating, casting pipe die 7 continues to rotate 30-60 second after first layer coating is dried, stop from
The heart is poured machine testing observation casting 7 inside coating of pipe die with a thickness of 0.3mm, and coating surface is smooth, smooth；7 turns of pipe die will be poured
To the second spray station 22, start the fluffy coating of the centrifugal casting machine spraying second layer, the revolving speed for being poured pipe die is 1700 r/
Min, casting pipe die 7 continues to rotate the generation of constantly getting angry by inward wall so that coating is completely dried 60 seconds after the completion of spraying
Certain hole, second layer coating with a thickness of 1.1mm；
(4) it is poured: the iron liquid casting for accounting for 0.8% silicon strontium inoculant of iron liquid weight and handling is added by mode is bred using fair current
To casting pipe die inner wall, pouring temperature is 1450 DEG C, is incited somebody to action under the influence of centrifugal force with after crystallisation by cooling in the outer surface of blank
Form the burr of uniformly protrusion.
Metallographic observation carried out to prepared sample, the pearlite of A type graphite+97% or more of the testing result greater than 90%+
A small amount of ferrite and iron phosphide eutectic, 4-6 grades of graphite size；The service life of mold can reach 18000-20000 only, mould when scrapping to mold
Tool inner wall also do not occur pulling phenomenon, cylinder sleeve chip processing performance experiments have shown that: it is same that knife is capable of processing 150-200 cylinder
Set.
Sample prepared by the blank of technique production in the past carries out metallographic observation, and as a result for A type graphite amount in 60-80%, graphite is long
5-7 grades, ferrite content 4-5% of degree, iron phosphide eutectic+carbide are not more than 5%, and die life, mould inner wall just went out less than 10000
Show and pulled phenomenon, it is necessary to which mold inner hole has been repaired；Cylinder sleeve chip processing performance experiments have shown that: it is same that knife is capable of processing
100-150 cylinder sleeve.
Claims (2)
1. a kind of preparation method of the burr cylinder jacket of centrifugal casting, characterized in that include the following steps: that (1) accurately weighs respectively
The pretreating agent for accounting for iron liquid quality 0.1 ~ 0.2% is added using medium-frequency induction furnace melting in raw material, controls iron liquid tapping temperature
1500-1550℃；Wherein, by weight percentage, the chemical composition of burr cylinder jacket are as follows: carbon: 2.8-3.7%；Sulphur: 0.03-
0.08%；Silicon: 1.7-2.8%；0 < phosphorus≤0.5%；Manganese: 0.5-1.0%；0 < chromium≤0.4%；Copper: 0.1-0.6%, surplus are iron；
(2) preparation of coating: by bentonite and water according to 1:(8 ~ 12) mass ratio be mixed and stirred for 10-12 hours, choose
The diatomite that 15-20kg is added in 100kg solution stands at least 4 hours after stirring 1-2 hours, the first coating is made；
(3) the first configured coating is respectively charged into the first coating pressure tank, second of coating is packed into the second coating pressure
Tank forms uniform cavity with the surface in casting pipe die inner wall, and the pressure of the first coating pressure tank is 0.1-0.2MPa, and second applies
The pressure for expecting pressurized tank is 0.3-0.5MPa；
(4) the casting pipe die of centrifugal casting machine is preheating to 150-450 DEG C, the first coating then is sprayed to casting pipe die, if
The revolving speed for setting casting pipe die is 1000-1300r/min, forms the first layer coating of 0.05-0.3mm thickness in casting pipe die inner wall,
After first layer coating is dry, to casting pipe die inner-wall spraying second layer coating, the revolving speed for being poured pipe die is 1400 ~ 1700 r/
Min, second layer coating with a thickness of 0.3 ~ 1.1mm, to be coated be completely dried can be poured；
(5) melting qualification iron liquid is poured after inoculation, 1350-1450 DEG C of pouring temperature, is bred using fair current,
The additional amount of inovulant is casting iron liquid quality 0.4-0.8%, is poured into casting pipe die after molten steel preparation processing, cooling to obtain the final product
Burr cylinder jacket.
2. the preparation method of the burr cylinder jacket of centrifugal casting according to claim 1, characterized in that in the step (2)
- 300 mesh of diatomite granularity requirements accounts for 70% or more.
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| CN108690937A (en) * | 2018-06-13 | 2018-10-23 | 中原内配集团安徽有限责任公司 | A kind of production method of wearproof engine cylinder sleeve |
| CN108754341A (en) * | 2018-06-13 | 2018-11-06 | 中原内配集团安徽有限责任公司 | A kind of cylinder jacket based on chrome molybdenum copper alloy |
| CN108906394B (en) * | 2018-07-05 | 2021-09-14 | 四川耀业科技股份有限公司 | Equipment for machining anti-burr cylinder sleeve |
| CN109594011A (en) * | 2019-01-23 | 2019-04-09 | 中国科学院光电技术研究所 | Applied to high-precision inside and outside circle, the grinding cast iron of plane lapping and its manufacturing method |
| CN111664019B (en) * | 2019-03-08 | 2022-03-15 | 中原内配集团股份有限公司 | Cylinder sleeve and preparation process thereof |
| CN111659868B (en) * | 2019-03-08 | 2022-07-19 | 中原内配集团股份有限公司 | Novel cylinder sleeve and preparation method thereof |
| CN110923563B (en) * | 2019-12-17 | 2021-06-25 | 扬州神驰新材料科技有限公司 | Wear-resistant cylinder sleeve for diesel engine and preparation process thereof |
| CN111690867B (en) * | 2020-07-08 | 2021-12-07 | 中原内配集团股份有限公司 | Alloy cast iron and preparation method thereof |
| CN111852681A (en) * | 2020-07-28 | 2020-10-30 | 中原内配集团安徽有限责任公司 | Low-density burr cylinder jacket |
| CN113245520A (en) * | 2021-03-31 | 2021-08-13 | 安庆帝伯格茨缸套有限公司 | Production process of bearing bushing with needled surface |
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| CN101381838A (en) * | 2008-10-17 | 2009-03-11 | 河南省中原内配股份有限公司 | Vermicular cast iron cylinder liner and preparation method thereof |
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