CN102327963A - Preparation method of nickel-based super-heat-resisting die with self-lubricating coating - Google Patents
Preparation method of nickel-based super-heat-resisting die with self-lubricating coating Download PDFInfo
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- CN102327963A CN102327963A CN201110161619A CN201110161619A CN102327963A CN 102327963 A CN102327963 A CN 102327963A CN 201110161619 A CN201110161619 A CN 201110161619A CN 201110161619 A CN201110161619 A CN 201110161619A CN 102327963 A CN102327963 A CN 102327963A
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Abstract
The invention relates to a preparation method of a nickel-based super-heat-resisting die with a self-lubricating coating. The method comprises the following steps: providing the nickel-based super-heat-resisting die as a substrate and preprocessing the surface to be processed of the substrate; applying an intermediate transition layer which is an NiCrAlY coating; applying a barrier layer which is a TiN or TaN coating; and applying a surface coating with the self-lubricating function, wherein the surface coating contains BN. By adopting the die, the service life and usability of the die can be improved.
Description
Technical field
The present invention relates to a kind of preparation method of metal die, in particular, relate to a kind of preparation method with Ni-based ultra heat-resisting mould of self-lubricating coat in use.
Background technology
Mould is widely used in punch forming processing.Generally need have following performance for stamping forming mould:
(1) under the hot environment, has good rigidity, anti-mechanical impact strength and high hardness.
(2) repeatedly and under the thermal shock of Fast Heating cooling, mould does not crack or is out of shape.
(3) under the hot conditions, chemical reaction does not take place in molding surface and forming metal.
(4) the high-temperature oxydation phenomenon can not take place in mould under hot conditions.
(5) good processability, the surface that is prone to be processed into high accuracy and high surface finish.
Traditional mould that is used to pour into a mould materials such as refractory metal or glass adopts stainless steel or Refractoloy steel as mold materials mostly; But high-temperature oxydation takes place in this mould easily; Under thermal cycle effect repeatedly; The inside crystal phase structure of material changes, and also variation of surface quality, thereby causes mould to lose efficacy easily.
In order to address the above problem, the metal oxide ceramic particle of hard and superhard alloy are used to mfg. moulding die.But, be difficult to be processed into required given shape because described material hardness is very high.So with superhard alloy or high-temperature alloy is die matrix, the composite construction mould that forms wear-resisting, high-temperature corrosion resistance on its surface or have a coating of other property becomes the new direction of industry development.
Summary of the invention
The object of the present invention is to provide a kind of preparation method with Ni-based ultra heat-resisting mould of self-lubricating function, this method can be used for improving the molding performance of Ni-based ultra heat-resisting mould and the service life of this mould of significant prolongation.
To achieve these goals, the present invention at first provides a kind of preparation method with Ni-based ultra heat-resisting mould of self-lubricating function, and it may further comprise the steps:
(1) provides a kind of Ni-based ultra heat-resisting mould as substrate, pre-treatment is carried out on the surface that substrate is pending;
(2) apply one deck intermediate layer, described intermediate layer is the NiCrAlY coating;
(3) apply one deck barrier layer, described barrier layer is TiN or TaN coating;
(4) apply the face coat with self-lubricating function, the face coat of described self-lubricating function comprises BN.
Wherein, Comprise the greasy dirt of removing substrate surface and the step of oxide layer at the pre-treatment step described in the step (1); It can use pre-treating technology commonly known in the art, for example uses alkali cleaning, pickling etc., preferably uses plasma etching method to etch away the oxide layer on surface.
Wherein, in step (2), can use the method for brushing or spraying to form the NiCrAlY coating, annealing forms intermediate layer under protective atmosphere then.Described spraying method can be selected from methods such as flame-spraying, HVAF, electric arc spraying, detonation flame spraying, cold spraying; In the described NiCrAlY coating, the mass fraction of Ni is: 75-83.5wt%, the mass fraction of Cr is: 8-15wt%, the mass fraction of Al are the Y of 2.5-7.5wt% and surplus.Wherein said protective atmosphere annealing is meant vacuum annealing or inert atmosphere annealing or reducing atmosphere annealing, and described protective gas can be selected from by N
2, Ar, H
2In the group that perhaps their combination in any is formed.The thickness in intermediate layer is 5um-100um, and preferably its thickness is 5um-20um.
Wherein, in step (3), can use the method for brushing, spraying, hot dipping, solid state diffusion to form the barrier layer, the thickness on barrier layer is 10um-50um, and preferably its thickness is 10um-25um.The preferred method of solid state diffusion of using forms the barrier layer, promptly at first oozes titanium or tantalum on the surface that step (2) is handled through powder solid or liquid, in nitrogen containing atmosphere, anneals then, forms TiN or TaN coating.
Wherein, in step (4), the face coat of self-lubricating function forms through the powder of spraying nitrogen boron and boron, in the wherein said powder, and nitrogen boron: 45-78wt%, boracic: 22-55wt%.During spraying, its technological parameter is: operating voltage: 25-40V; Spray distance is: 100-250mm; Air pressure is 0.5-0.9MPa.The thickness of self-lubricating coat in use is 500um-5mm, and preferably its thickness is 2mm-5mm.
Use the intermediate layer can prevent that basalis is in high temperature casting cycle generation high-temperature oxydation phenomenon; Also strengthened the adhesion strength between substrate and the coating in addition; Use the barrier layer to prevent that inner metal level (basalis and NiCrAlY alloy-layer) is through diffusion; Metallic atom wherein diffuses in the self-lubricating function coating on surface, the self-lubricating function of infringement self-lubricating function coating.
Ni-based ultra heat-resisting mould through method preparation of the present invention; Have NiCrAlY intermediate layer, TiN or TaN barrier layer and contain the boron nitride coating of boron; Because setting adjacent one another are and atomic structure are roughly close between substrate and the coating; Therefore, adjacent coating can be because of problems such as atom defects, produces internal stress and causes the problem of bad adhesion between the coating; Through coating structure of the present invention design, intermediate layer and barrier layer can increase the boron nitride coating that contains boron and substrate between Ni-based ultra heat-resisting mould between cohesive force.And, in the self-lubricating coat in use of the present invention, except boron nitride, also have the boron of specific quantity as the hard phase, can reduce the internal stress and the coefficient of friction thereof of face coat.Therefore, adopt the mould of the said structure of the application, can increase the service life and the serviceability thereof of mould.
The specific embodiment
Below will make further explanation to technical scheme of the present invention through specific embodiment.The applicant it is emphasized that following examples only are the needs for the content that specifies invention, and can not think limitation of the present invention.The present invention requires the scope protected, is as the criterion with the technical scheme that claims were limited.
Embodiment 1
Step 1
Provide a kind of Ni-based ultra heat-resisting mould as substrate; What described Ni-based ultra heat-resisting mould used is a kind of nickel-base heat resisting superalloy; It is formed and content is: the Ni of Cr:15wt%, Al:5wt%, B:2wt%, Mo:10wt% and surplus and unavoidable impurities, wherein the total content of unavoidable impurities is lower than 0.15wt%.At first use the greasy dirt of the means removal substrate surface of conventional alkali cleaning, use the method for plasma etching then, etch away the oxide of substrate surface, expose fresh base alloy layer.
Step 2
Brushing under vacuum atmosphere, forms the NiCrAlY coating in 600 degree annealing 1h then by the metal powder coating of Ni, Cr, Al, Y powder constituent; In the described NiCrAlY coating, the mass fraction of Ni is: 78.5wt%, the mass fraction of Cr is: 10wt%, the mass fraction of Al are the Y of 6.2wt% and surplus.The thickness in intermediate layer is 10um.
Step 3
Use the method for solid state diffusion to form the Ti layer, in nitrogen atmosphere, formed the TiN barrier layer in 25 minutes in 300 degree annealing in process then, the thickness on barrier layer is 10um.
Step 4
The face coat of self-lubricating function forms through the powder of spraying nitrogen boron and boron, in the wherein said powder, and nitrogen boron: 72wt%, boracic: 28wt%.During spraying, its technological parameter is: operating voltage: 30V; Spray distance is: 150mm; Air pressure is 0.8MPa.The thickness of self-lubricating coat in use is 2mm.
Embodiment 2
Step 1
Provide a kind of Ni-based ultra heat-resisting mould as substrate; What described Ni-based ultra heat-resisting mould used is a kind of nickel-base heat resisting superalloy; It is formed and content is: the Ni of Cr:12wt%, Al:8wt%, C:2wt%, Fe:8wt% and surplus and unavoidable impurities, wherein the total content of unavoidable impurities is lower than 0.15wt%.At first use the greasy dirt of the means removal substrate surface of conventional alkali cleaning, use the method for plasma etching then, etch away the oxide of substrate surface, expose fresh base alloy layer.
Step 2
Spraying forms sprayed coating by the metal dust of Ni, Cr, Al, Y powder constituent, under vacuum atmosphere, forms the NiCrAlY coating in 500 degree annealing 1h then; In the described NiCrAlY coating, the mass fraction of Ni is: 82.5wt%, the mass fraction of Cr is: 12wt%, the mass fraction of Al are the Y of 5.5wt% and surplus.The thickness in intermediate layer is 10um.
Step 3
Use the method for solid state diffusion to form the Ta layer, in nitrogen atmosphere, formed the TaN barrier layer in 30 minutes in 450 degree annealing in process then, the thickness on barrier layer is 10um.
Step 4
The face coat of self-lubricating function forms through the powder of spraying nitrogen boron and boron, in the wherein said powder, and nitrogen boron: 68wt%, boracic: 32wt%.During spraying, its technological parameter is: operating voltage: 30V; Spray distance is: 180mm; Air pressure is 0.7MPa.The thickness of self-lubricating coat in use is 3mm.
Embodiment 3
Step 1
Provide a kind of Ni-based ultra heat-resisting mould as substrate; What described Ni-based ultra heat-resisting mould used is a kind of nickel-base heat resisting superalloy; It is formed and content is: the Ni of Cr:20wt%, Ti:5wt%, B:3wt%, Mo:12wt% and surplus and unavoidable impurities, wherein the total content of unavoidable impurities is lower than 0.15wt%.At first use the greasy dirt of the means removal substrate surface of conventional alkali cleaning, use the method for plasma etching then, etch away the oxide of substrate surface, expose fresh base alloy layer.
Step 2
Electric arc spraying under inert gas atmosphere, forms the NiCrAlY coating in 500 degree annealing 1h then by the metal powder coating of Ni, Cr, Al, Y powder constituent; In the described NiCrAlY coating, the mass fraction of Ni is: 83.5wt%, the mass fraction of Cr is: 12wt%, the mass fraction of Al are the Y of 3.2wt% and surplus.The thickness in intermediate layer is 20um.
Step 3
Use the method for solid state diffusion to form the Ta layer, in nitrogen atmosphere, formed the TaN barrier layer in 30 minutes in 450 degree annealing in process then, the thickness on barrier layer is 20um.
Step 4
The face coat of self-lubricating function forms through the powder of spraying nitrogen boron and boron, in the wherein said powder, and nitrogen boron: 63wt%, boracic: 37wt%.During spraying, its technological parameter is: operating voltage: 30V; Spray distance is: 180mm; Air pressure is 0.7MPa.The thickness of self-lubricating coat in use is 5mm.
Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art works as can make various corresponding changes and distortion by summary of the invention according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
1. preparation method with Ni-based ultra heat-resisting mould of self-lubricating function, it may further comprise the steps:
(1) provides a kind of Ni-based ultra heat-resisting mould as substrate, pre-treatment is carried out on the surface that substrate is pending;
(2) apply one deck intermediate layer, described intermediate layer is the NiCrAlY coating;
(3) apply one deck barrier layer, described barrier layer is TiN or TaN coating;
(4) apply the face coat with self-lubricating function, the face coat of described self-lubricating function comprises BN.
2. the preparation method of the described Ni-based ultra heat-resisting mould of claim 1 is characterized in that described pre-treatment step comprises the alkali cleaning oil removing and uses plasma etching method to etch away the oxide layer on surface.
3. the preparation method of the described Ni-based ultra heat-resisting mould of claim 1; The mass fraction of the composition of described NiCrAlY coating and content position: Ni is: 75-83.5wt%; The mass fraction of Cr is: 8-15wt%, the mass fraction of Al are the Y of 2.5-7.5wt% and surplus.
4. the preparation method of the described Ni-based ultra heat-resisting mould of claim 1 is characterized in that the method formation that described NiCrAlY coating is used brushing or sprayed, and annealing forms intermediate layer under protective atmosphere then.
5. the preparation method of the described Ni-based ultra heat-resisting mould of claim 4 is characterized in that described spraying method is selected from flame-spraying, HVAF, electric arc spraying, detonation flame spraying or cold spray-coating method.
6. the preparation method of the described Ni-based ultra heat-resisting mould of claim 4 is characterized in that described protective atmosphere annealing is meant vacuum annealing or inert atmosphere annealing or reducing atmosphere annealing.
7. the preparation method of the described Ni-based ultra heat-resisting mould of claim 4 is characterized in that described protective gas is selected from by N
2, Ar, H
2The perhaps group formed of their combination in any.
8. the preparation method of the described Ni-based ultra heat-resisting mould of claim 1 is characterized in that the method for barrier layer use brushing, spraying, hot dipping, solid state diffusion forms Titanium or tantalum layer, in nitrogen containing atmosphere, anneals then, forms TiN or TaN coating.
9. the preparation method of the described Ni-based ultra heat-resisting mould of claim 1 is characterized in that the powder formation of the face coat of self-lubricating function through spraying nitrogen boron and boron.
10. the preparation method of the described Ni-based ultra heat-resisting mould of claim 1 is characterized in that nitrogen boron: 45-78wt% in the wherein said powder, boracic: 22-55wt%.
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|---|---|---|---|
| CN201110161619A CN102327963A (en) | 2011-06-16 | 2011-06-16 | Preparation method of nickel-based super-heat-resisting die with self-lubricating coating |
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| CN201110161619A CN102327963A (en) | 2011-06-16 | 2011-06-16 | Preparation method of nickel-based super-heat-resisting die with self-lubricating coating |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030044634A1 (en) * | 2001-08-31 | 2003-03-06 | Kelly Thomas Joseph | Article having a superalloy protective coating, and its fabrication |
| US20060286401A1 (en) * | 2005-04-01 | 2006-12-21 | Siemens Aktiengesellschaft | Layer system |
| CN101698362A (en) * | 2009-10-30 | 2010-04-28 | 华南理工大学 | Self-lubricating hard nanocomposite laminated coating and preparation method thereof |
| CN101927586A (en) * | 2009-12-04 | 2010-12-29 | 华中科技大学 | Metallic matrix surface composite coating and preparation method thereof |
-
2011
- 2011-06-16 CN CN201110161619A patent/CN102327963A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030044634A1 (en) * | 2001-08-31 | 2003-03-06 | Kelly Thomas Joseph | Article having a superalloy protective coating, and its fabrication |
| US20060286401A1 (en) * | 2005-04-01 | 2006-12-21 | Siemens Aktiengesellschaft | Layer system |
| CN101698362A (en) * | 2009-10-30 | 2010-04-28 | 华南理工大学 | Self-lubricating hard nanocomposite laminated coating and preparation method thereof |
| CN101927586A (en) * | 2009-12-04 | 2010-12-29 | 华中科技大学 | Metallic matrix surface composite coating and preparation method thereof |
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