CN104550678A - Long-lasting surface coating for metal gravity casting die for aluminum piston and preparation method - Google Patents
Long-lasting surface coating for metal gravity casting die for aluminum piston and preparation method Download PDFInfo
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- CN104550678A CN104550678A CN201410816142.5A CN201410816142A CN104550678A CN 104550678 A CN104550678 A CN 104550678A CN 201410816142 A CN201410816142 A CN 201410816142A CN 104550678 A CN104550678 A CN 104550678A
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- coating
- long
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- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
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- Plasma & Fusion (AREA)
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention relates to a long-lasting surface coating for a metal gravity casting die for an aluminum piston and a preparation method. The coating is characterized in that the coating is resistant to high temperature, anti-oxidation and higher in thermal insulation, the flowability of molten aluminum can be changed, the mold filling capacity can be improved, and long-term reusability is achieved. The aims of improving the surface quality of an aluminum piston casting, improving the dimensional consistency of the casting, prolonging the service life of the die, improving the production efficiency and improving the working environment of the site are fulfilled.
Description
Technical field
The present invention relates to the long-acting coating of die surface, particularly relate to a kind of aluminium recovery metal gravity casting die long-acting coating in surface and preparation method.
Background technology
At present, aluminium recovery casting extensively adopts metal gravity casting die to produce blank, metal type dies has unsuitable perviousness, when aluminium recovery is cast in and uses metal type dies, its meeting alloy aluminium liquid flowing and process of setting produce diverse impact, are thus necessary to use suitable coating to be controlled said process.The key property selecting coating needs to consider is surfaceness, oilness after heat insulating ability, spraying, to ensure that foundry goods is easy to depanning and obtains good visual appearance.Metal current type aluminium recovery mold coating is mainly prepared by a certain percentage with aluminum oxide, talcum powder, mica, diatomite etc., then by operative employee's hand spray at die surface.Whole process batching is loaded down with trivial details, and work-ing life is short is generally no more than an order of classes or grades at school, and the aluminium recovery visual quality of casting consistence of acquisition is poor.And its subject matter existed is: Paint Adhesion is poor, duration of service is short, and metal type dies in use needs scraping repeatedly, spray material, extremely requires great effort time-consuming, and floating dust remaining during coatings components is serious to contamination, affects workman healthy.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, there is provided a kind of and can substitute traditional coating, coating and die matrix have enough bonding strengths and high temperature resistant aluminium corrosion ability, enough thermal fatigue resistances, the long-acting coating of certain thermal and insulating performance and preparation method.Reach the object improved aluminium recovery surface quality of continuous castings, improve casting dimension consistence, extend die life, work on the spot environment of enhancing productivity, improve.
For achieving the above object, the present invention adopts following operational path and technical scheme:
The long-acting coating in a kind of aluminium recovery metal gravity casting die surface, be made up of metal bonding bottom and composite ceramics top layer, described bond coating is coated on mould, described composite ceramics top layer is overlying on described bond coating, described bond coating is Co alloy material, and described Co alloy material is made up of the metallic substance of following weight percents: Cr:28-30%; W:4-5%; C:1-1.5%; Ni:1.2-1.7%; Fe:1.2-1.7%; Si:0.8-1.2%, all the other are Co; Described composite ceramics top layer is ZrO
2composite ceramics, described ZrO
2it is 8-10%Y that composite ceramics contains weight percent
2o
3.(each per-cent of the application is all weight percent)
The gauge control of described bond coating is at 15-20 μm.
Described composite ceramics skin depth controls at 90-130 μm.
The bonding strength of described long-acting coating and die surface: >7000Psi, the thickness of described long-acting coating: 100 μm ~ 150 μm; The porosity of described long-acting coating: alloy layer <1%; Ceramic layer <5%; The roughness of described long-acting coating: Ra10.
Described metal mold aluminium recovery die surface is without nitriding treatment, and die hardness controls at HRC30-40.
Described spraying technology adopts hypersonic flame spraying HVOF/HVAF+ plasma spray system.Metal mold aluminium recovery mould coating after spraying can remove old coating by electrolytic process, and repeatedly repeatedly sprays.A making method for the long-acting coating in aluminium recovery metal gravity casting die surface, comprises the following steps:
A) by completing cleaning, rotary table that the metal mold aluminium recovery gravity casting die matrix of grit blasting operation is placed on thermal spraying apparatus carries out preheating, preheating temperature controls at 100-120 DEG C;
B) use supersonic flame spraying method, on metal mold aluminium recovery gravity casting die matrix, spraying forms bond coating, and the material that bond coating is selected is the corrosion of the resistance to molten aluminum alloy that Co is added with Cr, Al, W, Ni, Fe, Si;
Spray gun model selects Praxair JP8000; Spraying equipment processing parameter is arranged: oxygen: 870L/min; Nitrogen: 11L/min; Fuel: 0.38L/min; Spray distance: 340-360mm.
C) use employing plasma spraying method, on bond coating, spraying forms one deck composite ceramics top layer, and composite ceramics top layer adopts ZrO
2be added with Y
2o
3composite ceramic material.
Spray gun model selects METCO 9MB; Spraying equipment processing parameter: electric current: 450A; Main gas (argon gas): 30-40L/min; Secondary gas (hydrogen): 18-25L/min; Spray distance: 70-80mm.Coat-thickness controls between 90-130 μm.In spraying process, die matrix temperature must not higher than 120 DEG C, and the path that the spraying path clustering in whole process adopts robot prepared in advance is consistent with metal type dies forming part bit-type face.
Preferably, the b) high speed of spraying process described in step flame temperature≤700 DEG C.
Preferably, c) top layer of composite ceramics described in step degree controls at 100 μm-150 μm.
Preferably, c) the spraying path clustering of step adopts robot path prepared in advance consistent with metal type dies forming part bit-type face.
Preparation (cleaning, the sandblasting) → preheating → spraying alloy bonding bottom → spraying composite ceramics top layer → inspection of die matrix.
The preparation of metal mold aluminium recovery gravity casting die matrix: require to design and produce metal mold aluminium recovery gravity casting die according to piston finished product, in mold pressing process, the every dimensional requirement of strict control, each shaping position of foundry goods are breathed freely good.The metal mold aluminium recovery gravity casting die of machine-shaping can not carry out nitriding treatment, and die matrix surface hardness controls between HRC30-40.Need to clean die matrix before the metal mold aluminium recovery gravity casting die matrix completed sprays long-acting coating, remove grease that matrix surface sticks, by the method textured metal type aluminium recovery gravity casting die of sandblasting (16# white fused alumina) surface, surface is have activated like this by increasing die surface free energy, increase the surface area that long-acting coated microgranules adheres to, to improve the bonding strength of coating and die matrix simultaneously.
The infrastructure device of the long-acting coating of metal mold aluminium recovery gravity casting die and preparation method: thermospray infrastructure device mainly contains spray painting room, spray gun, thermal source, coated material feedway and Controlling System and cooling system composition.By completing cleaning, the metal mold aluminium recovery gravity casting die matrix of grit blasting operation protects non-spraying region, is placed on the rotary table of thermal spraying apparatus and carries out preheating, and preheating temperature controls be preheated to 100-120 DEG C.First adopt hypersonic flame spraying to adopt Co to be added with the bond coating of the corrosion of the resistance to molten aluminum alloy material composition of Cr, the gauge control of bond coating must not higher than 700 DEG C 15-20 μm of spraying process high speed flame temperature.Then plasma spraying Y is adopted
2o
3composite ceramic material, coat-thickness controls between 90-130 μm, and the path that the spraying path clustering in whole process adopts robot prepared in advance is consistent with metal type dies forming part bit-type face.
The long-acting coating of metal mold aluminium recovery die surface that inspection thermospray completes should reach following requirement: the bonding strength that it is characterized in that long-acting coating and die surface: be greater than 7000Psi (ASTM C633), the thickness of long-acting coating: 100 μm-150 μm; The porosity of long-acting coating: alloy layer <1%; Ceramic layer <5% (ASTM E2109); The roughness of long-acting coating: Ra10.Ensure that foundry goods is easy to depanning and obtains good visual appearance, and ensure that coating has higher heat insulating ability, change the flowing of aluminium liquid and improve cavity filling ability.
The removing of the long-acting coating of metal mold aluminium recovery die surface: use for some time, complete the metal mold aluminium recovery mould of some amount, because partial coating comes off, when cannot meet specification of quality, die matrix is placed in special electrolytic tank, adopt the electrolytic solution for this coating special configuration, electrolyte PH value to control while thorough corrosion resistant coating again on metal mold aluminium recovery mold surface roughness without impact, adjust Faradaic current in corrosion process and adopt low current inhibition mode to carry out.
Beneficial effect of the present invention
1. provide a kind of and can substitute traditional coating, coating and die matrix have enough bonding strengths and high temperature resistant aluminium corrosion ability, enough thermal fatigue resistances, the long-acting coating of certain thermal and insulating performance and preparation method.Reach the object improved aluminium recovery surface quality of continuous castings, improve casting dimension consistence, extend die life, work on the spot environment of enhancing productivity, improve.
2. often spraying once long-acting coating by the metal mold aluminium recovery mould of above preparation method's process can continuous seepage 8000 aluminium recovery foundry goods; A set of metal mold aluminium recovery mould can repeatedly spray, and die life, the mould of specific surface nitriding treatment improve 1 times; Every order of classes or grades at school can be saved the mold cleaning of 0.5-1 hour and paint spay-coating time, improve the production efficiency of 20%; Improve aluminium recovery surface quality of continuous castings, improve the dimensional uniformity of aluminium recovery foundry goods; Improve on-the-spot Working environment.
Embodiment
Mode by the following examples further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments.The experimental technique of unreceipted actual conditions in the following example, conventionally selects with condition.
Embodiment 1:
By completing cleaning, the WD615E2-3A resultant metal type aluminium recovery gravity casting die matrix of grit blasting operation protects non-spraying region, is placed on the rotary table of thermal spraying apparatus and carries out preheating, and preheating temperature controls be preheated to 100 DEG C.First hypersonic flame spraying is adopted to adopt Co:58.9%; Cr:30%; W:5%; C:1.5%; Ni:1.7%; Fe:1.7%; The bond coating of the corrosion of the resistance to molten aluminum alloy material composition of Si:1.2%, the gauge control of bond coating is at 15 μm, and spraying process high speed flame temperature must not higher than 700 DEG C.Then plasma spraying, adopts and is added with 10%Y
2o
3zrO
2composite ceramics, coat-thickness controls at 90-100 μm, and the path that the spraying path clustering in whole process adopts robot prepared in advance is consistent with metal type dies forming part bit-type face.
The long-acting coating of metal mold aluminium recovery die surface that inspection thermospray completes should reach following requirement: the bonding strength that it is characterized in that long-acting coating and die surface: 7030Psi (ASTM C633), the thickness of long-acting coating: 110 μm; The porosity of long-acting coating: alloy layer is 0.89%; Ceramic layer is 4.6% (ASTM E2109); The roughness of long-acting coating: Ra10.
Embodiment 2:
By completing cleaning, the WD615E2-3A resultant metal type aluminium recovery gravity casting die matrix of grit blasting operation protects non-spraying region, is placed on the rotary table of thermal spraying apparatus and carries out preheating, and preheating temperature controls be preheated to 120 DEG C.First hypersonic flame spraying is adopted to adopt Co:63.8%; Cr:28%; W:4%; C:1%; Ni:1.2%; Fe:1.2%; The bond coating of the corrosion of the resistance to molten aluminum alloy material composition of Si:0.8%, the gauge control of bond coating is at 20 μm, and spraying process high speed flame temperature must not higher than 700 DEG C.Then plasma spraying, adopts and is added with 8%Y
2o
3zrO
2composite ceramics, coat-thickness controls at 120-130 μm, and the path that the spraying path clustering in whole process adopts robot prepared in advance is consistent with metal type dies forming part bit-type face.
The long-acting coating of metal mold aluminium recovery die surface that inspection thermospray completes should reach following requirement: the bonding strength that it is characterized in that long-acting coating and die surface: 7051Psi (ASTM C633), the thickness of long-acting coating: 145 μm; The porosity of long-acting coating: alloy layer is 0.75%; Ceramic layer is 3.5% (ASTM E2109); The roughness of long-acting coating: Ra10.
Embodiment 3:
By completing cleaning, the WD615E2-3A resultant metal type aluminium recovery gravity casting die matrix of grit blasting operation protects non-spraying region, is placed on the rotary table of thermal spraying apparatus and carries out preheating, and preheating temperature controls be preheated to 110 DEG C.First hypersonic flame spraying is adopted to adopt Co:61.25%; Cr:29%; W:4.5%; C:1.25%; Ni:1.5%; Fe:1.5%; The bond coating of the corrosion of the resistance to molten aluminum alloy material composition of Si:1.0%, the gauge control of bond coating must not higher than 700 DEG C 18 μm of spraying process high speed flame temperatures.Then plasma spraying, adopts and is added with 9%Y
2o
3zrO
2composite ceramics, coat-thickness controls at 110-120 μm, and the path that the spraying path clustering in whole process adopts robot prepared in advance is consistent with metal type dies forming part bit-type face.
The long-acting coating of metal mold aluminium recovery die surface that inspection thermospray completes should reach following requirement: the bonding strength that it is characterized in that long-acting coating and die surface: be 7046i (ASTM C633), the thickness of long-acting coating: 135 μm; The porosity of long-acting coating: alloy layer is 0.85%; Ceramic layer 0.48% (ASTM E2109); The roughness of long-acting coating: Ra10.
Mould prepared by above 3 examples is for actual production, and the blank of acquisition all meets the requirement of Q/BG matter 139-2012 " piston non-machined surface blank appearance standard "
Embodiment 4
Adding up respectively for the mould producing WD615E2-3A product adopts two mold use procedure data of traditional coating and the long-acting coating of spraying to compare:
Although above-mentioned, the specific embodiment of the present invention is described; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. the long-acting coating in aluminium recovery metal gravity casting die surface, be made up of metal bonding bottom and composite ceramics top layer, it is characterized in that, described bond coating is coated on mould, described composite ceramics top layer is overlying on described bond coating, described bond coating is Co alloy material, and described Co alloy material is made up of the metallic substance of following weight percents: Cr:28-30%; W:4-5%; C:1-1.5%; Ni:1.2-1.7%; Fe:1.2-1.7%; Si:0.8-1.2%, all the other are Co; Described composite ceramics top layer is ZrO
2composite ceramics, described ZrO
2composite ceramics contains the Y that weight percent is 8-10%
2o
3.
2. long-acting coating according to claim 1, is characterized in that, the gauge control of described bond coating is at 15-20 μm.
3. long-acting coating according to claim 2, is characterized in that, described composite ceramics skin depth controls at 90-130 μm.
4. the arbitrary described long-acting coating of claim 1-3, is characterized in that, the bonding strength of described long-acting coating and die surface: >7000Psi, the thickness of described long-acting coating: 100 μm ~ 150 μm; The porosity of described long-acting coating: alloy layer <1%; Ceramic layer <5%; The roughness of described long-acting coating: Ra10.
5. the arbitrary described long-acting coating of claim 1-3, it is characterized in that, metal mold aluminium recovery die surface is without nitriding treatment, and die hardness controls at HRC30-40.
6. the arbitrary described long-acting coating of claim 1-3, is characterized in that, adopt hypersonic flame spraying HVOF/HVAF+ plasma spray system.
7. the arbitrary described long-acting coating of claim 1-3, it is characterized in that, the metal mold aluminium recovery mould coating after spraying can remove old coating by electrolytic process, and repeatedly repeatedly sprays.
8. a making method for the long-acting coating in aluminium recovery metal gravity casting die surface, is characterized in that, comprise the following steps:
A) by completing cleaning, rotary table that the metal mold aluminium recovery gravity casting die matrix of grit blasting operation is placed on thermal spraying apparatus carries out preheating, preheating temperature controls at 100-120 DEG C;
B) use supersonic flame spraying method, on metal mold aluminium recovery gravity casting die matrix, spraying forms bond coating, and the material that bond coating is selected is the corrosion of the resistance to molten aluminum alloy that Co is added with Cr, Al, W, Ni, Fe, Si;
C) use employing plasma spraying method, on bond coating, spraying forms one deck composite ceramics top layer, and composite ceramics top layer adopts ZrO
2be added with Y
2o
3composite ceramic material.
9. preparation method according to claim 8, is characterized in that, b) high speed of spraying process described in step flame temperature≤700 DEG C.
10. preparation method according to claim 8, is characterized in that, c) top layer of composite ceramics described in step degree controls at 100 μm-150 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410816142.5A CN104550678A (en) | 2014-12-23 | 2014-12-23 | Long-lasting surface coating for metal gravity casting die for aluminum piston and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410816142.5A CN104550678A (en) | 2014-12-23 | 2014-12-23 | Long-lasting surface coating for metal gravity casting die for aluminum piston and preparation method |
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| CN104550678A true CN104550678A (en) | 2015-04-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109881137A (en) * | 2019-03-21 | 2019-06-14 | 浪潮商用机器有限公司 | A kind of mold texture processing method |
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| US6503442B1 (en) * | 2001-03-19 | 2003-01-07 | Praxair S.T. Technology, Inc. | Metal-zirconia composite coating with resistance to molten metals and high temperature corrosive gases |
| CN1548578A (en) * | 2003-05-21 | 2004-11-24 | 中国科学院金属研究所 | Prepn of heat shock resisting heat barrier coating |
| EP1837412A2 (en) * | 2006-03-24 | 2007-09-26 | United Technologies Corporation | Coating suitable for use as a bondcoat in a thermal barrier coating system |
| CN102094170A (en) * | 2009-12-15 | 2011-06-15 | 沈阳天贺新材料开发有限公司 | Zirconium oxide thermal barrier coating for turbine buckets of gas turbine and preparation method thereof |
| CN103374693A (en) * | 2012-04-27 | 2013-10-30 | 上海宝钢工业技术服务有限公司 | Nano thermal barrier coating on surface of high-temperature furnace roller and preparation method thereof |
| CN103521581A (en) * | 2013-10-23 | 2014-01-22 | 武汉理工大学 | Method and die for obtaining mechanical performance gradient hot stamping part |
-
2014
- 2014-12-23 CN CN201410816142.5A patent/CN104550678A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6503442B1 (en) * | 2001-03-19 | 2003-01-07 | Praxair S.T. Technology, Inc. | Metal-zirconia composite coating with resistance to molten metals and high temperature corrosive gases |
| CN1548578A (en) * | 2003-05-21 | 2004-11-24 | 中国科学院金属研究所 | Prepn of heat shock resisting heat barrier coating |
| EP1837412A2 (en) * | 2006-03-24 | 2007-09-26 | United Technologies Corporation | Coating suitable for use as a bondcoat in a thermal barrier coating system |
| EP1837412A3 (en) * | 2006-03-24 | 2011-03-16 | United Technologies Corporation | Coating suitable for use as a bondcoat in a thermal barrier coating system |
| CN102094170A (en) * | 2009-12-15 | 2011-06-15 | 沈阳天贺新材料开发有限公司 | Zirconium oxide thermal barrier coating for turbine buckets of gas turbine and preparation method thereof |
| CN103374693A (en) * | 2012-04-27 | 2013-10-30 | 上海宝钢工业技术服务有限公司 | Nano thermal barrier coating on surface of high-temperature furnace roller and preparation method thereof |
| CN103521581A (en) * | 2013-10-23 | 2014-01-22 | 武汉理工大学 | Method and die for obtaining mechanical performance gradient hot stamping part |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109881137A (en) * | 2019-03-21 | 2019-06-14 | 浪潮商用机器有限公司 | A kind of mold texture processing method |
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Effective date of registration: 20170713 Address after: 256602 Bohai Road, Shandong, No. twenty-one, No. 569, Binzhou Applicant after: Binzhou Bohai piston Co., Ltd. Address before: 256602 Bohai Road, Shandong, No. 21, No. 569, Binzhou Applicant before: Bohai Piston Co., Ltd., Bingzhou City, Shandong Prov. |
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