CN100453789C - Surface-treated piston for internal combustion engine, and its preparing method - Google Patents
Surface-treated piston for internal combustion engine, and its preparing method Download PDFInfo
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- CN100453789C CN100453789C CNB2006100439461A CN200610043946A CN100453789C CN 100453789 C CN100453789 C CN 100453789C CN B2006100439461 A CNB2006100439461 A CN B2006100439461A CN 200610043946 A CN200610043946 A CN 200610043946A CN 100453789 C CN100453789 C CN 100453789C
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Abstract
The present invention relates to an internal combustion engine piston, particularly to an internal combustion engine piston with a processed surface and a manufacturing method thereof. A piston base body is formed by casting aluminum alloy. A working surface comprises a top part and a skirt part. The internal combustion engine piston is characterized in that the surface of the top part of the piston base body has a ceramic layer, and the skirt part has a MoS2 spraying layer. Generally, the thickness of the ceramic layer is from 0.08 to 0.15mm, and the thickness of the MoS2 spraying layer is from 0.01 to 0.03mm. The manufacturing method of the piston comprises a microarc oxidation technology used for the ceramic layer of the top part of the piston and the manufacturing method of the MoS2 spraying layer of the skirt part of the piston. The manufacturing technology of the MoS2 spraying layer comprises the following steps of cleaning, preheating, spraying, first baking and second baking for the surface of the piston. The high temperature resistance, the impact resistance, the corrosion resistance, the abrasive resistance and other integrative properties of the internal combustion engine piston with a processed surface are greatly improved.
Description
Technical field
The present invention relates to an internal combustion engine, relate more specifically to the surface treatment of internal combustion engine.
Background technique
Internal combustion engine requires the operating temperature height, and thermal shock is big, and the high friction of speed is frequent, and pot type piston (simple cast aluminium or aluminum alloy material are made) is difficult to satisfy under the operating mode harsh conditions works, and is restricting the raising of motor combination property for a long time.Scientific and technical personnel have implemented various behaves both at home and abroad for this reason: as: " anodization ", " plasma gas-phase deposit ceramic treatment ", " the spraying teflon is handled " etc., serious hope can solve above difficult point, but the result is one-side solution difficult point, does not solve above-mentioned difficult point on the whole.
The plasma micro-arc oxidation is a kind of direct new technology at aluminum alloy surface growth in situ ceramic layer.It is to grow up on anodised basis the nearly more than ten years, but both are in mechanism, technology and many differences are arranged in nature.The piston head differential arc oxidation is that piston head is placed electrolyte aqueous solution, utilize electrochemical method in the surface micropore of this material, to produce the spot of sparkover, under thermochemistry, under plasma chemistry and the electrochemical acting in conjunction, generate the method for ceramic membrane.The piston sample is put into electrolyte aqueous solution, after the energising, the surface generates very thin layer oxide film immediately, when the voltage that applies on the sample surpasses a certain critical value, some weak link on this layer dielectric film is breakdown, the micro-arc discharge phenomenon takes place, and is immersed in and can sees numerous acnode of moving about and spark on the sample surfaces in the solution.Position a little less than the patina relative thin takes place because always puncture, and after oxide insulating film is breakdown, generates new patina at this position, and breakdown spot is transferred to the weak zone of other relative thin, and the final patina that forms is uniform.This patina is by γ-Al
2O
3, α-Al
2O
3Form, can obtain higher wear resistance, corrosion resistance, resistance to sudden heating, improve the life-span and the efficient of motor.
Micro-arc oxidation device mainly contains voltage regulation of electric power sources control system, electrolytic bath, stirring system, cooling system four parts composition.Power supply and voltage control system provide differential arc oxidation required high-tension electricity, and electrolytic bath is made by stainless steel usually, the double negative electrode of doing, interior Sheng differential arc oxidation electrolyte aqueous solution; Stirring system can improve electrolytical uniformity in the solution; The circulatory system can guarantee the relatively stable of electrolytic solution.
At present, Russia preponderates on research scale and level, China is introducing on the basis that absorbs Russian technology, begin now with wear-resisting, high temperature resistant impact, the form of corrosion-resistant finishes is moved towards operational phase, and the unit of domestic research and successful Application is also few, mainly contain comparatively system of Institute of Low Energy Nuclear Physics, Beijing Normal University's research work in this respect, they are to the appearance structure of the preparation process of Micro-Arc Oxidized Ceramic Layer of Aluminum Alloy, energy interchange, film and use and all inquire into.Harbin Huanya Micro Arc Technology Co., Ltd turns to pilot run the existing experimental stage, and has built up a semi-automatic production line.This technology case report as yet of being successfully applied to piston head up to now.
MoS
2(molybdenum disulfide) coating is a kind of oiling agent of high-quality, has advantages such as friction factor little (about 0.05) anti-attrition is good, and it can improve piston skirt spraying molybdenum disulfide the break-in situation and reduce the scuffing of cylinder bore fault, and can make the wear resistance of cylinder sleeve improve 1-2 doubly, in addition MoS
2The raising of the The friction coefficient of coating load and progressively reducing, and good film-forming property.
Summary of the invention
The objective of the invention is to overcome the shortcoming that existing piston exists, a kind of surface-treated piston for internal combustion engine and manufacture method thereof are provided.Integrated utilization differential arc oxidation treatment technology, MoS
2Spraying technology is handled piston, so that the combination properties such as high temperature resistant impact, corrosion resistance and wear resistance of piston are greatly improved.
The present invention is achieved by the following scheme: a kind of manufacture method of surface-treated piston for internal combustion engine comprises spraying one deck MOS on the skirt surface that adopts micro-arc oxidation process to adhere to last layer oxidation vitrification ceramic layer, piston matrix on the piston matrix top surface
2, it is characterized in that described ceramic layer micro-arc oxidation process controlled conditions is: voltage is at 600-800V, and electric current is at 10-25A/dm
2, the oxidation liquid temp is at 20-60 ℃, oxidization time 20-50 minute; Described MoS
2The manufacturing technology steps of sprayfused coating comprises: piston face cleans, and----secondary baking--is once toasted--in spraying in preheating.
The micro-arc oxidation process of optimizing: voltage is at 600-650V, and electric current is at 15-20A/dm
2, the oxidation liquid temp is at 20-60 ℃, oxidization time 25-35 minute.
MoS
2The manufacturing process of sprayfused coating: dirts such as the all-aluminium piston matrix is cleaned and deoiled, dirt; be preheating to about 120-140 ℃ after the vapour degreasion cleaning with tetrachloroethylene or trichloroethylene; the position that annular groove, pin-and-hole etc. need not be sprayed protects and is placed on the spraying machine, with spray gun with MoS
2Be sprayed onto on the piston skirt, coating thickness is 0.01-0.03mm.MoS
2The spray coating liquor prescription is: contain 2-5g boric acid, 8-12g lead fluorosilicate [Pb (SiF in every 100ML solvent
6)
2] and 5-10g/MoS
2The adding of prescription mesoboric acid and lead fluorosilicate can make MoS
2Powder keeps even suspension state, not only makes the thickness homogeneous of spraying, and can significantly improve its adhesive strength.During spraying, piston temperature remains on 100-140 ℃, decides film quality by the control temperature, and temperature is too high, and thickness easily surpasses, and temperature is low excessively, MoS
2Imperfect bonding, and uneven thickness.Will toast after the spraying, roasting temperature and time control have determined MoS
2Bonding quality.General baking at twice, one time roasting temperature 130-140 ℃, endurance 25-30 minute, take out and wipe the superfluous powder in surface, carry out secondary baking then, continue 25-35 minute down at 125-135 ℃, make MOS
2Powder bonds fully.
Beneficial effect of the present invention is that surface treated piston is shock-resistant, corrosion-resistant, wear-resisting property improves greatly, and the installation back is compared with the common aluminum alloy piston: 1. moment of torsion improves 4Nm, power improves more than the 2Kw; 2. durability improves, and the overhaul mileage prolongs 50%-100%; 3. mechanical efficiency improves more than 2%; 4. exhaust emissions CO, HC content obviously descend.
In the method for making piston of the present invention, piston head arc differential oxide ceramic layer technology and skirt section spraying MoS
2The technology major advantage is that technology is grasped easily and the realization parameter is controlled automatically, is easy to organize industrialized production, and occupation area of equipment is little, and Processing capacity is strong, and the manufacturing efficiency height is not reducing material γ-Al
2O
3, α-Al
2O
3The ceramic membrane value reaches and does not change under the condition of the former physical dimension of alloy workpiece, surface roughness, can increase substantially wear-resisting, corrosion-resistant, the high temperature resistance impact property of piston, satisfies the needs under the various bad working environments conditions.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a piston head micro arc oxidation treatment device structural representation of the present invention.
Fig. 3 is piston skirt MoS of the present invention
2The spray-coating apparatus schematic representation.
Among the figure, 1. piston head, 2. arc differential oxide ceramic layer, 3. skirt section, 4.MOS
2Sprayfused coating, 5. piston matrix, 71. high-voltage poweies, 72. control system, 73. the deionized water coolant pump, 74. bring disaster to wiring terminal, 75. electrolytic baths, 76. insulating rods, 77. stirring system, 78. frocks, 79. pistons, 710. electrolytic solution, 81. motor, 82,83,84,815. belt pulleys, 85. position limit switches, 86. nuts, 87. gunjet rack .88. lead screw shaft, 89. electromagnet, 810. spray guns, 811. piston 812. seam dishes, 813. seam seats, 814. main shafts
Embodiment
A kind of surface-treated piston for internal combustion engine has a ceramic layer (2) on the top surface of piston matrix (5), thickness is 0.08-0.15mm, and skirt section (3) have a MoS
2Sprayfused coating (4), thickness are 0.01-0.03mm.
The manufacture method of above-mentioned surface-treated piston for internal combustion engine comprises piston head (1) ceramic layer (2) and piston skirt (3) MoS
2The manufacture method of sprayfused coating (4).
Piston head (1) ceramic layer (2) adopts micro-arc oxidation process: at first calculate the piston head surface area, in thermostatic chamber, measure piston head thickness and skirt section molded lines size, cleaning piston surface, preferred every process parameter, prepare suitable oxidation liquid composition and component, the pH value 9-12 of oxidation liquid, use deionized water, and be provided with constand current, constand voltage control gear and oxidation liquid heat exchange temperature controlling device, voltage is risen to 500V, initial current starts electrolytic solution cooling and stirring system at 10-15A.Oxidation film layer thickness changes with the variation of oxidization time, notice that the control ceramic film generates the best formation speed of initial time, create conditions for patina turns to growth inside, the control of differential arc oxidation electric current, voltage, the control of oxidization time are the keys that improves the piston head ceramic layer thickness.The differential arc oxidation Control of Voltage changes in the 600-650 scope, and oxidation current is controlled at 10-15A/dm
2Change in the scope, the oxidation liquid temp is controlled in the 20-60 ℃ of scope, the part surface that is immersed in the oxidation liquid applies down in higher voltage, make the initial one deck rete that generates in its surface, breakdown when the insulating oxide part, produce minute-pressure plasma arc light discharge, under the high density energy effect of plasma micro-arc discharge generation, piston head surface forms TRANSIENT HIGH TEMPERATURE, the high pressure differential of the arc with oxide side, patina and interface layer materials such as oxidation liquid be melted and form γ-Al
2O
3, α-Al
2O
3Ceramic membrane.Oxidization time is according to the technical matters parameter request, and ceramic layer thickness determines that oxidization time is 30 minutes.The current efficiency of the growing process by optimizing differential arc oxidation film layer and the process parameter of differential arc oxidation amount of time finally obtain the corrosion-resistant of optimal economic thickness, high temperature resistant impact ceramic layer
Piston skirt MoS
2The manufacturing technology steps of sprayfused coating may further comprise the steps: piston face cleans, and----secondary baking--is once toasted--in spraying in preheating.According to MoS
2The technical requirements of the manufacturing process of sprayfused coating, optimizing technology parameters and solution ratio, MoS
2The spray coating liquor prescription is: add 2-5g boric acid, 8-12g lead fluorosilicate [Pb (SiF in every 100ML solvent
6)
2] and the MoS of 5-10g
2The adding of prescription mesoboric acid and lead fluorosilicate can make MoS
2Powder keeps the evenly outstanding turbid state of tucking in, and not only makes the thickness homogeneous of spraying, and can significantly improve its adhesive strength.All-aluminium piston matrix (5), clean deoil, dirt such as dirt, carry out preheating 120-140 ℃ after cleaning with the vapour degreasion of tetrachloroethylene or trichloroethylene, the position that annular groove, pin-and-hole etc. need not be sprayed protects and is placed on the spraying machine, with spray gun with MoS
2Be sprayed onto on the piston skirt (3).Coating thickness is 0.01-0.03mm.Piston temperature is controlled at about 125 ℃ during spraying, and temperature is too high, and thickness easily surpasses; Temperature is low excessively, MoS
2Imperfect bonding, and uneven thickness.Will degree of carrying out after the spraying; Superfluous MoS is wiped with soft cotton yarn in the baking back for the first time
2Powder baking about 130 ℃ about 30 minutes, bonds it more fully.
The piston head differential arc oxidation is handled employed apparatus structure and is seen accompanying drawing 2 in the foregoing description; Piston skirt MoS
2Spray employed device and see accompanying drawing 3.
Claims (3)
1. the manufacture method of a surface-treated piston for internal combustion engine comprises spraying one deck MOS on the skirt surface that adopts micro-arc oxidation process to adhere to last layer oxidation ceramic layer, piston matrix on the piston matrix top surface
2, it is characterized in that described ceramic layer micro-arc oxidation process controlled conditions is: voltage is at 600-800V, and electric current is at 10-25A/dm
2, the oxidation liquid temp is at 20-60 ℃, oxidization time 20-50 minute; Described MoS
2The manufacturing technology steps of sprayfused coating comprises: piston face cleans, and----secondary baking--is once toasted--in spraying in preheating.
2. the manufacture method of a kind of surface-treated piston for internal combustion engine as claimed in claim 1 is characterized in that described ceramic layer micro-arc oxidation process: voltage 600-650V, electric current 15-20A/dm
2, oxidizing temperature 20-60 ℃, oxidization time 25-35 minute.
3. the manufacture method of a kind of surface-treated piston for internal combustion engine as claimed in claim 1 is characterized in that MoS
2The manufacturing process of sprayfused coating also comprises piston substrate preheating after the cleaning to 120-140 ℃, and the position that annular groove, pin-and-hole etc. need not be sprayed protects and is placed on the spraying machine, with spray gun with Mos
2Be sprayed onto on the skirt section of piston matrix, coating thickness is 0.01-0.03mm, spraying temperature 110-140 ℃; Mos
2The spray coating liquor prescription is: contain 2-5g boric acid, 8-12g lead fluorosilicate [Pb[siF6] in every 100ML solvent
2And 5-10g/MoS
2One time roasting temperature 130-150 ℃, endurance 25-35 minute, take out and to wipe the superfluous powder in surface, secondary baking again, roasting temperature continues 25-35 minute down at 125-135 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100439461A CN100453789C (en) | 2006-05-15 | 2006-05-15 | Surface-treated piston for internal combustion engine, and its preparing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100439461A CN100453789C (en) | 2006-05-15 | 2006-05-15 | Surface-treated piston for internal combustion engine, and its preparing method |
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| Publication Number | Publication Date |
|---|---|
| CN1851251A CN1851251A (en) | 2006-10-25 |
| CN100453789C true CN100453789C (en) | 2009-01-21 |
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|---|---|---|---|
| CNB2006100439461A Active CN100453789C (en) | 2006-05-15 | 2006-05-15 | Surface-treated piston for internal combustion engine, and its preparing method |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338126A (en) * | 2011-08-06 | 2012-02-01 | 河南兴发精细化工有限公司 | Application of deionized water in cooling chemical pump machine seal |
| CN102943295A (en) * | 2012-10-31 | 2013-02-27 | 东风汽车零部件(集团)有限公司 | Aluminium alloy piston top and ring groove anodization method |
| CN103016196A (en) * | 2012-12-27 | 2013-04-03 | 石家庄金刚凯源动力科技有限公司 | Piston applicable to heavy oil |
| CN104343576B (en) * | 2013-08-01 | 2017-04-12 | 日立汽车系统株式会社 | A piston of an internal combustion engine, a manufacturing method thereof, an aluminum alloy part and a manufacturing method of the aluminum alloy part |
| CN103757679B (en) * | 2014-01-22 | 2016-05-18 | 东风活塞轴瓦有限公司 | A kind of all-aluminium piston top differential arc oxidation method |
| CN106435673A (en) * | 2016-12-22 | 2017-02-22 | 日照金港活塞有限公司 | Preparation technology of thermal insulation coating on internal combustion engine forging steel piston top |
| CN108180085A (en) * | 2018-01-24 | 2018-06-19 | 安徽浩丰实业有限公司 | A kind of aluminum piston and its surface treatment method |
| CN109026426A (en) * | 2018-08-15 | 2018-12-18 | 全椒县全动机械有限公司 | A kind of internal combustion engine and its surface treatment method |
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