CN107043994B - Composite coating needle selector and preparation method thereof - Google Patents

Composite coating needle selector and preparation method thereof Download PDF

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Publication number
CN107043994B
CN107043994B CN201710183684.7A CN201710183684A CN107043994B CN 107043994 B CN107043994 B CN 107043994B CN 201710183684 A CN201710183684 A CN 201710183684A CN 107043994 B CN107043994 B CN 107043994B
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coating
needle selector
alloy
pvd
remelting
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CN107043994A (en
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沈学忠
袁安素
朱国朝
温振伟
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Dongguan Hanjing Nano Material Co., Ltd.
Nashi New Materials (Zhejiang) Co., Ltd.
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Dongguan Hanjing Nano Materials Ltd
Nashi New Materials Co ltd
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/0641—Nitrides
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Plasma & Fusion (AREA)
  • Physics & Mathematics (AREA)
  • Textile Engineering (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

The invention relates to a needle selector with a composite coating and a preparation method thereof. The invention provides a needle selector with a composite coating, which comprises a needle selector, wherein a thermal spraying remelting alloy coating and a PVD coating are sequentially adhered to the surface of the needle selector; wherein the thermally sprayed remelted alloy coating comprises Cr3C2The PVD coating is an alloy coating comprising AlCrN, CrAlN, CrN, AlTiN, TiAlN, TiAlCrN, TiSiN, TiSiAlN, TiAlWN or a combination thereof. According to the needle selector with the composite coating and the preparation method thereof, the needle selector with the composite coating is formed by sequentially depositing the thermal spraying remelting alloy coating and the PVD coating on the surface of the needle selector body, so that the needle selector with the composite coating is effectively prevented from being corroded and worn in the using process, and the service life of the needle selector with the composite coating is further prolonged.

Description

Composite coating needle selector and preparation method thereof
Technical Field
The invention relates to the technical field of spinning, in particular to a needle selector with a composite coating and a preparation method thereof.
Background
In the field of current textile processing, along with the expansion of textile materials, needle selectors not only need stronger wear resistance, but also need to have corrosion resistance to cope with the surrounding corrosive environment. However, the conventional selector has failed to satisfy the above-described requirements. Specifically, changes in the components (such as a shuttle, a needle, a thread, etc.) which are in sliding contact with the surface of the selector, the sliding rate or manner, and the environment in which the selector is placed may increase the wear and corrosion of the ordinary selector, resulting in a reduction in the service life of the ordinary selector.
Therefore, the existing needle selector needs to be improved to improve the wear resistance and corrosion resistance of the needle selector and prolong the service life of the needle selector.
Disclosure of Invention
One of the purposes of the invention is to provide a needle selector with a composite coating, which can effectively improve the corrosion resistance and the abrasion resistance of the needle selector.
According to one embodiment of the invention, the needle selector with the composite coating comprises the needle selector, wherein the surface of the needle selector is sequentially adhered with a thermal spraying remelting alloy coating and a Physical Vapor Deposition (PVD) coating; wherein the thermally sprayed remelted alloy coating comprises Cr3C2The PVD coating is an alloy coating comprising AlCrN, CrAlN, CrN, AlTiN, TiAlN, TiAlCrN, TiSiN, TiSiAlN, TiAlWN or a combination thereof.
According to another embodiment of the invention, a method for preparing a needle selector with a composite coating is also provided, which comprises the following steps: providing a needle selector; the surface of the needle selector is sprayed with Cr by adopting a supersonic flame spraying process3C2-an alloy coating of NiCr, WC-12Co, WC-12Ni, WC-10Co-4Cr, WC-15Ni, TiC-15Ni or combinations thereof to form a thermal sprayed alloy coating; remelting the thermal spraying alloy coating attached to the surface of the needle selector to form a thermal spraying remelting alloy coating; and depositing a nano hard coating comprising AlCrN, CrAlN, CrN, AlTiN, TiAlN, TiAlCrN, TiSiN, TiSiAlN, TiAlWN or a combination thereof on the surface of the hot spraying remelting alloy coating subjected to remelting treatment by adopting a PVD process to form the PVD coating.
According to the needle selector with the composite coating and the preparation method thereof, the needle selector with the composite coating is formed by sequentially depositing the thermal spraying remelting alloy coating and the PVD coating on the surface of the needle selector body, so that the needle selector with the composite coating is effectively prevented from being corroded and worn in the using process, and the service life of the needle selector with the composite coating is further prolonged.
Drawings
FIG. 1 is a front view of a composite coating selector according to an embodiment of the invention
FIG. 2 is a partial cross-sectional view of the composite coated needle selector shown in FIG. 1 cut in the A-A direction
FIG. 3 is a front view of a composite coating selector according to another embodiment of the invention
FIG. 4 is a partial cross-sectional view of the composite coated needle selector shown in FIG. 3 cut in the direction B-B
Detailed Description
In order that the spirit of the invention may be better understood, some preferred embodiments of the invention are described below.
Fig. 1 is a front view of a composite coating selector 100 according to an embodiment of the present invention, and fig. 2 is a partial sectional view of the composite coating selector 100 shown in fig. 1 cut in the a-a direction.
As shown in fig. 1 and 2, the composite coating needle selector 100 includes a needle selector 10, and a thermally sprayed remelted alloy coating 12 and a PVD coating 14 are attached to a surface 10a of the needle selector 10 in this order. Wherein the thermally sprayed remelted alloy coating 12 comprises Cr3C2An alloy coating of-Ni-Cr, WC-12Co, WC-12Ni, WC-10Co-4Cr, WC-15Ni, TiC-15Ni or a combination thereof for enhancing the corrosion resistance of the needle selector 10, and the PVD coating 14 is a nano hard coating comprising AlCrN, CrAlN, CrN, AlTiN, TiAlN, TiAlCrN, TiSiN, TiSiAlN, TiAlWN or a combination thereof for enhancing the wear resistance of the needle selector 10.
In one embodiment of the invention, the thermally sprayed remelted alloy coating 12 is comprised of Cr3C2A dual alloy coating of Ni-Cr and the PVD coating 14 is a nano hard coating comprising AlCrN; cr (chromium) component3C2And Ni-Cr are preferably present in a weight ratio of about 75% to about 25%.
In yet another embodiment of the present invention, the thickness of the thermally sprayed remelted alloy coating 12 is 0.1mm to 1mm, and the thickness of the thermally sprayed remelted alloy coating 12 may further preferably be 0.2mm to 0.5 mm. The thickness of the PVD coating 14 is 0.1 μm to 15 μm, and the thickness of the PVD coating 14 may further preferably be 6 μm to 12 μm, more preferably 8 μm to 10 μm.
In a further embodiment of the invention, the surface hardness of the PVD coating 14 is 1500HV to 5000 HV. The surface hardness of the PVD coating 14 may further preferably be about 3300HV-3800 HV.
The preparation method of the composite coating needle selector 100 shown in fig. 1 according to the embodiment of the invention comprises the following steps:
providing a needle selector 10;
spraying an alloy coating on the surface 10a of the needle selector 10 by adopting a supersonic flame spraying process;
remelting the thermal spray alloy coating attached to the surface 10a of the selector 10 to form a thermal spray remelted alloy coating 12;
and depositing a PVD coating 14 on the surface 12a of the hot spraying remelting alloy coating 12 after remelting treatment by adopting a PVD process, thereby forming the composite coating needle selector 100.
According to an embodiment of the invention, a bonding layer can be added between the thermal spray remelting alloy coating 12 and the PVD coating 14, so that the bonding strength between the thermal spray remelting alloy coating 12 and the PVD coating 14 is further improved.
Fig. 3 is a front view of a composite coated needle selector 200 according to another embodiment of the present invention, and fig. 4 is a partial sectional view of the composite coated needle selector 200 shown in fig. 3 cut in the direction B-B.
As shown in fig. 3 and 4, the composite coated needle selector 200 further includes a bonding layer 16 between the thermally sprayed remelted alloy coating 12 and the PVD coating 14, based on the composite coated needle selector 100.
In one embodiment of the invention, the bonding layer 16 is a Ti, Cr or Al metal layer or an alloy layer thereof.
In a further embodiment of the invention, the bonding layer 16 has a thickness of 0.05 μm to 1 μm, preferably 0.05 μm to 0.5 μm.
The preparation method of the composite coating needle selector 200 shown in fig. 3 according to the embodiment of the invention comprises the following steps:
providing a needle selector 10;
spraying an alloy coating on the surface 10a of the needle selector 10 by adopting a supersonic flame spraying process;
remelting the thermal spray alloy coating attached to the surface 10a of the selector 10 to form a thermal spray remelted alloy coating 12;
depositing a bonding layer 16 on the surface 12a of the thermally sprayed remelted alloy coating 12 after remelting by PVD
The PVD coating 14 is deposited on the surface 16a of the bonding layer 16 using a PVD process,
thereby forming the composite coated needle selector 200.
In one embodiment of the present invention, the step of forming the PVD coating 14 using a PVD process comprises: firstly, argon with the purity of 99.999 percent is introduced, and the surface of the thermal spraying remelting alloy coating 12 or the surface of the bonding layer 16 is cleaned under the condition of the bias voltage of 800-; then, the argon gas supply is stopped, nitrogen gas with the purity of 99.999 percent is supplied, the target containing the metal for composing the PVD coating 14 is opened under the condition of the bias voltage of 80-100V, the arc current is 120A-200A, and the PVD process is adopted to deposit and form the PVD coating 14 on the surface of the cleaned hot spraying remelting alloy coating 12 or the surface of the bonding layer 16.
In one embodiment of the present invention, the step of forming the bonding layer 16 using a PVD process comprises: argon gas with the purity of 99.999 percent is introduced under the conditions of bias voltage of 400-600V and arc current of 100A, then the argon gas is turned off, and a target containing metal for forming the bonding layer 16 is adopted to deposit and form the bonding layer 16 on the surface of the thermally sprayed and remelted alloy coating 12 after remelting treatment by adopting a PVD process.
In yet another embodiment of the present invention, the reflow process is performed by using a laser with a power of 500-1000W (preferably about 800W), a spot diameter of 3-5mm (preferably about 4mm), and a moving speed of 0.5-3m/min (preferably about 1.5 m/min).
The thermal spraying remelting treatment is to melt the most easily-melted metal in the alloy contained in the thermal spraying remelting alloy coating 12 by using a heat source, the generated liquid phase is beneficial to strengthening in the diffusion process and penetration of components, the melting process enables the bonding area of the thermal spraying remelting alloy coating 12 and the surface 10a of the needle selector 10 to be changed from the original stacked layered structure into a compact and uniform structure, and pores are reduced or even disappear, so that the bonding degree between the thermal spraying remelting alloy coating 12 and the needle selector 10 and the internal quality of the thermal spraying remelting alloy coating 12 are improved, and the corrosion resistance and the wear resistance of the thermal spraying remelting alloy coating 12 are further improved.
The needle selector 200 is additionally provided with the bonding layer 16 positioned in front of the thermal spraying remelting alloy coating 12 and the PVD coating 14 on the basis of the needle selector 100 for the composite coating, and the bonding degree between the PVD coating 14 and the thermal spraying remelting alloy coating 12 can be further enhanced by forming the transition between the thermal spraying remelting alloy coating 12 and the PVD coating 14 through the bonding layer 16.
Embodiments of the present invention may form the thermally sprayed remelted alloy coating 12 by a conventional spray process with conventional supersonic flame spraying equipment, and the bonding layer 16 and the PVD coating 14 by a conventional PVD process with conventional PVD equipment.
In another embodiment of the invention, the composite coating needle selector is based on the composite coating needle selector 100 or the composite coating needle selector 200, and further comprises a nitriding layer between the surface of the needle selector and the thermal spray remelting alloy coating 12 to further strengthen the bonding degree between the surface of the needle selector and the thermal spray remelting alloy coating 12. The thickness of the nitrided layer is 0.1mm to 0.5mm, and the thickness of the nitrided layer may further preferably be not less than 0.2 mm. According to one embodiment of the invention, the preparation process of the nitriding layer comprises the following steps: before the supersonic flame spraying process is adopted to spray on the surface of the needle selector to form the thermal spraying alloy coating, the needle selector is subjected to ion nitriding treatment to form a nitriding layer.
The invention will now be further described with reference to some of its more preferred embodiments.
Example 1
Providing a needle selector 10;
cr is sprayed on the surface 10a of the needle selector 10 by adopting the supersonic flame spraying process3C2-a Ni-Cr alloy to form a thermal sprayed alloy coating with a thickness of 0.3 mm; wherein, Cr3C2And Ni-Cr in the weight proportions of 75% and 25%;
remelting the thermal spray alloy coating attached to the surface 10a of the needle selector 10 to form a thermal spray remelting alloy coating 12, wherein laser remelting is adopted for remelting, the set power is 800W, the spot diameter is 4mm, and the moving speed is 1.5 m/min;
argon gas with the purity of 99.999 percent (namely high-purity argon gas) is introduced, the surface of the hot spraying remelting alloy coating 12 after remelting treatment is cleaned under the condition of bias voltage of 800-1000V, then the argon gas is turned off, nitrogen gas with the purity of 99.999 percent (namely high-purity nitrogen gas) is introduced, a CrAl target is opened under the condition of bias voltage of 80-100V, the arc current is 120A-200A, and AlCrN alloy is deposited on the surface 12a of the cleaned hot spraying remelting alloy coating 12 by adopting a PVD process to form a PVD coating 14 with the thickness of 7-9 mu m, so that the composite coating needle selector 100 is formed. The surface hardness of the composite coating needle selector 100 is about 3800 HV.
Example 2
Providing a needle selector 10;
cr is sprayed on the surface 10a of the needle selector 10 by adopting the supersonic flame spraying process3C2-a Ni-Cr alloy to form a thermal sprayed alloy coating with a thickness of 0.3 mm; wherein, Cr3C2And Ni-Cr in the weight proportions of 75% and 25%;
remelting the thermal spray alloy coating attached to the surface 10a of the needle selector 10 to form a thermal spray remelting alloy coating 12, wherein laser remelting is adopted for remelting, the set power is 1000W, the spot diameter is 5mm, and the moving speed is 0.5 m/min;
argon gas with the purity of 99.999 percent (namely high-purity argon gas) is introduced, the surface of the hot spraying remelting alloy coating 12 after remelting treatment is cleaned under the condition of bias voltage of 800-1000V, then the argon gas is turned off, nitrogen gas with the purity of 99.999 percent (namely high-purity nitrogen gas) is introduced, an AlTi target is turned on under the condition of bias voltage of 80-100V, the arc current is 120A-200A, TiAlN alloy is deposited on the surface 12a of the cleaned hot spraying remelting alloy coating 12 by adopting a PVD process to form a PVD coating 14 with the thickness of 4-8 mu m, and therefore the composite coating needle selector 100 is formed. The surface hardness of the composite coating needle selector 100 is about 3300 HV.
Example 3
Providing a needle selector 10;
subjecting the needle selector 10 to ion nitriding treatment at 400 ℃ in a nitrogen atmosphere to form a nitrided layer having a thickness of 0.25 mm;
spraying Cr on the surface of the nitriding layer by adopting a supersonic flame spraying process3C2-a Ni-Cr alloy to form a thermal sprayed alloy coating with a thickness of 0.3 mm; wherein, Cr3C2And Ni-Cr in the weight proportions of 75% and 25%;
remelting the thermal spraying alloy coating attached to the surface of the nitriding layer to form a thermal spraying remelting alloy coating 12, wherein laser remelting is adopted for remelting, the power is set to be 500W, the diameter of a light spot is 3mm, and the moving speed is 3 m/min;
under the conditions of bias voltage of 400-600V and arc current of 100A, argon with the purity of 99.999 percent (namely high-purity argon) is introduced, then the argon is turned off, a Cr metal target is adopted, and Cr metal is deposited on the surface 12a of the hot spraying remelting alloy coating 12 after remelting treatment by adopting a PVD process to form a bonding layer 16 with the thickness of 0.5 mu m;
introducing nitrogen with the purity of 99.999 percent (namely high-purity nitrogen), opening the CrAl target under the condition of bias voltage of 80-100V, carrying out arc current of 120A to 200A, and depositing AlCrN alloy on the surface 16a of the bonding layer 16 by adopting a PVD process to form a PVD coating 14 with the thickness of 7-9 mu m so as to form the composite coating needle selector 200. The surface hardness of the composite coating needle selector 200 is about 3700 HV.
Example 4
Providing a needle selector 10;
subjecting the needle selector 10 to ion nitriding treatment at 400 ℃ in a nitrogen atmosphere to form a nitriding layer, the thickness of which is 0.3 mm;
spraying WC-10Co-4Cr alloy on the surface of the nitriding layer by adopting a supersonic flame spraying process to form a thermal spraying alloy coating with the thickness of 0.3 mm; wherein, the weight proportion of WC, Co and Cr is 86%, 10% and 4%;
remelting the thermal spraying alloy coating attached to the surface of the nitriding layer to form a thermal spraying remelting alloy coating 12, wherein laser remelting is adopted for remelting, the power is set to be 800W, the diameter of a light spot is 4mm, and the moving speed is 1.5 m/min;
argon gas with the purity of 99.999 percent (namely high-purity argon gas) is introduced, the surface of the hot spraying remelting alloy coating 12 after remelting treatment is cleaned under the condition of bias voltage of 800-1000V, then the argon gas is turned off, nitrogen gas with the purity of 99.999 percent (namely high-purity nitrogen gas) is introduced, a CrAl target is opened under the condition of bias voltage of 80-100V, the arc current is 120A-200A, and AlCrN alloy is deposited on the surface 12a of the cleaned hot spraying remelting alloy coating 12 by adopting a PVD process to form a PVD coating 14 with the thickness of 7-9 mu m, so that the composite coating needle selector 100 is formed. The surface hardness of the composite coating needle selector 100 is about 3750 HV.
Example 5
Providing a needle selector 10;
spraying WC-10Co-4Cr alloy on the surface 10a of the needle selector 10 by adopting a supersonic flame spraying process to form a thermal spraying alloy coating with the thickness of 0.3 mm; wherein, the weight proportion of WC, Co and Cr is 86%, 10% and 4%;
remelting the thermal spray alloy coating attached to the surface 10a of the needle selector 10 to form a thermal spray remelting alloy coating 12, remelting by laser, setting the power to be 800W, the spot diameter to be 4mm, and the moving speed to be 1.5 m/min;
under the conditions of bias voltage of 400-600V and arc current of 100A, argon with the purity of 99.999 percent (namely high-purity argon) is introduced, then the argon is turned off, and Cr metal is deposited on the surface 12a of the hot spraying remelting alloy coating 12 after remelting treatment by adopting a Cr metal target to form a bonding layer 16 with the thickness of 0.5 mu m;
introducing nitrogen with the purity of 99.999 percent (namely high-purity nitrogen), opening the CrAl target under the condition of bias voltage of 80-100V, carrying out arc current of 120A to 200A, and depositing AlCrN alloy on the surface 16a of the bonding layer 16 by adopting a PVD process to form a PVD coating 14 with the thickness of 7-9 mu m so as to form the composite coating needle selector 200. The surface hardness of the composite coating needle selector 200 is about 3800 HV.
Example 6
Providing a needle selector 10;
spraying WC-12Ni alloy on the surface 10a of the needle selector 10 by adopting a supersonic flame spraying process to form a thermal spraying alloy coating with the thickness of 0.3 mm; wherein, the weight ratio of WC to Ni is 88% and 12%;
remelting the thermal spray alloy coating attached to the surface 10a of the needle selector 10 to form a thermal spray remelting alloy coating 12, remelting by laser, setting the power to be 800W, the spot diameter to be 4mm, and the moving speed to be 1.5 m/min;
under the conditions of bias voltage of 400-600V and arc current of 100A, argon with the purity of 99.999 percent (namely high-purity argon) is introduced, then the argon is turned off, and Cr metal is deposited on the surface 12a of the hot spraying remelting alloy coating 12 after remelting treatment by adopting a Cr metal target to form a bonding layer 16 with the thickness of 0.5 mu m;
introducing nitrogen with the purity of 99.999 percent (namely high-purity nitrogen), opening the CrAl target under the condition of bias voltage of 80-100V, carrying out arc current of 120A to 200A, and depositing AlCrN alloy on the surface 16a of the bonding layer 16 by adopting a PVD process to form a PVD coating 14 with the thickness of 7-9 mu m so as to form the composite coating needle selector 200. The surface hardness of the composite coating needle selector 200 is about 3800 HV.
Example 7
Providing a needle selector 10;
spraying WC-12Co alloy on the surface 10a of the needle selector 10 by adopting a supersonic flame spraying process to form a thermal spraying alloy coating with the thickness of 0.3 mm; wherein, the weight ratio of WC to Co is 88% and 12%;
remelting the thermal spray alloy coating attached to the surface 10a of the needle selector 10 to form a thermal spray remelting alloy coating 12, remelting by laser, setting the power to be 800W, the spot diameter to be 4mm, and the moving speed to be 1.5 m/min;
introducing argon with the purity of 99.999 percent (namely high-purity argon) under the conditions of bias voltage of 400-600V and arc current of 100A, then turning off the argon, and depositing Ti metal on the surface 12a of the hot spraying remelting alloy coating 12 subjected to remelting treatment by adopting a Ti metal target to form a bonding layer 16 with the thickness of 0.5 mu m;
introducing nitrogen with the purity of 99.999 percent (namely high-purity nitrogen), opening the AlTi target under the condition of bias voltage of 80-100V, carrying out arc current of 120A to 200A, and depositing TiAlN alloy on the surface 16a of the bonding layer 16 by adopting a PVD process to form a PVD coating 14 with the thickness of 4-8 mu m so as to form the composite coating needle selector 200. The surface hardness of the composite coating needle selector 200 is about 3200 HV.
Example 8
Providing a needle selector 10;
cr is sprayed on the surface 10a of the needle selector 10 by adopting the supersonic flame spraying process3C2-a Ni-Cr alloy to form a thermal sprayed alloy coating with a thickness of 0.3 mm; wherein, Cr3C2And Ni-Cr in the weight proportions of 75% and 25%;
remelting the thermal spray alloy coating attached to the surface 10a of the needle selector 10 to form a thermal spray remelting alloy coating 12, remelting by laser, setting the power to be 800W, the spot diameter to be 4mm, and the moving speed to be 1.5 m/min;
under the conditions of bias voltage of 400-600V and arc current of 100A, argon with the purity of 99.999 percent (namely high-purity argon) is introduced, then the argon is turned off, and Cr metal is deposited on the surface 12a of the hot spraying remelting alloy coating 12 after remelting treatment by adopting a Cr metal target to form a bonding layer 16 with the thickness of 0.5 mu m;
introducing nitrogen with the purity of 99.999 percent (namely high-purity nitrogen), opening the AlTi target and the Cr target under the condition of bias voltage of 80-100V, carrying out arc current of 120A to 200A, and depositing TiAlCrN alloy on the surface 16a of the bonding layer 16 by adopting a PVD process to form a PVD coating 14 with the thickness of 7-9 mu m, thereby forming the composite coating needle selector 200. The surface hardness of the composite coating needle selector 200 is about 3600 HV.
The following table shows the comparison of the performance parameters of the composite coating needle selector of each embodiment of the invention and the common needle selector
Figure BDA0001254272280000081
Figure BDA0001254272280000091
Note:
the ● double alloy needle selector was made of 42CrMo quenched and tempered steel, and the surface was subjected to a nickel-base alloy spray welding treatment with a thickness of about 0.27mm (0.27mm is the average thickness of the coating on the surface of the needle selector 10 in examples 1 to 8).
● powder alloy stainless steel needle selector is made of imported powder alloy stainless steel.
● PVD coating needle selector is a needle selector only adhered with PVD technique deposition coating.
● the corrosion resistance was tested by immersing the coating of the selector in 10% HCl solution at 40 deg.C for 10h and measuring the weight loss per unit surface area per unit time.
● the wear resistance is measured by a grinding wheel abrasion tester under defined test conditions by means of a planar reciprocating movement of the coating and the grinding paper glued to the outer edge of the grinding wheel, the grinding wheel being rotated through a small angle (0.9 ℃) after each double stroke, the reduction in the coating mass (mg) after a defined number of grindings being taken as a measure for the wear resistance, according to the standards ISO 8251-87 and JISH 8682.
As can be seen from the above table, compared with common needle selectors (i.e., dual-alloy needle selector, powdered alloy stainless steel needle selector, and PVD coated needle selector), the composite coated needle selector provided by the embodiments of the present invention effectively improves the surface hardness and corrosion resistance of the composite coated needle selector by disposing the thermal spray remelting alloy coating and the PVD coating on the surface of the needle selector, thereby improving the quality and service life of the composite coated needle selector.
In addition, the double-alloy needle selector mainly utilizes the corrosion resistance of nickel, so that the process control is difficult, the combination degree of the double-alloy layer on the surface is low, and the double-alloy layer is easy to fall off, so that the quality of the needle selector is rapidly reduced in the using process. The needle selector with the composite coating provided by the embodiment of the invention can improve the bonding degree of the coating on the surface of the needle selector by remelting the hot spraying remelting alloy coating and/or additionally arranging the bonding layer between the hot spraying remelting alloy coating and the PVD coating, and effectively avoid the coating from falling off, so that the quality of the needle selector with the composite coating is further improved, and the service life of the needle selector with the composite coating is prolonged.
Compared with a powder alloy stainless steel needle selector with higher price, the composite coating needle selector provided by the embodiment of the invention has the advantages that the performance is improved, the price is reduced, and the production cost is saved.
Although the PVD technique is a known engineering technique established on the basis of modern physics, chemistry, materials science, electronics, mechanics, etc., a process of depositing a metal or non-metal target (a coating material) on a workpiece surface to be coated through a physical process in a vacuum environment is provided. However, the corrosion resistance and wear resistance of the needle selector obtained by directly depositing the coating on the surface of the needle selector 10 by using the PVD technique cannot meet the use requirements of the needle selector. The needle selector with the composite coating provided by the embodiment of the invention combines the supersonic flame spraying process and the PVD process, and the hot spraying remelting alloy coating and the PVD coating are respectively formed on the needle selector, so that the corrosion resistance and the wear resistance of the needle selector with the composite coating are improved. Meanwhile, the combination degree between the thermal spraying remelting alloy coating and the needle selector and between the thermal spraying remelting alloy coating and the PVD coating is ensured through remelting treatment on the thermal spraying remelting alloy coating, or the combination degree between the thermal spraying remelting alloy coating and the PVD coating is further enhanced through adding a combination layer between the thermal spraying remelting alloy coating and the PVD coating, and effective combination between coatings formed by different processes is realized.
While the foregoing has been with reference to the disclosure of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention should not be limited to the disclosure of the embodiments, but should include various alternatives and modifications without departing from the invention, which are covered by the claims of the present patent application.

Claims (11)

1. A composite coating needle selector, comprising: the needle selector is characterized in that a nitriding layer, a hot spraying remelting alloy coating and a physical vapor deposition PVD coating are sequentially attached to the surface of the needle selector; wherein the thermally sprayed remelted alloy coating comprises Cr3C2-Ni-Cr、WC-12Co、WC-12Ni、WC-10Co-4Cr、The PVD coating is an alloy coating of WC-15Ni, TiC-15Ni or a combination thereof, the PVD coating is a nano hard coating comprising AlCrN, CrAlN, CrN, AlTiN, TiAlN, TiAlCrN, TiSiN, TiSiAlN, TiAlWN or a combination thereof, the thickness of the nitriding layer is 0.1mm-0.5mm, and the thickness of the thermal spraying remelting alloy coating is 0.1mm-1 mm.
2. The composite coating selector of claim 1 wherein the thermally sprayed remelted alloy coating is comprised of Cr3C2-an alloy coating of Ni-Cr and the PVD coating is a nano hard coating comprising AlCrN.
3. The composite coating selector of claim 2 wherein the Cr is3C2Is 75% by weight, and the Ni-Cr proportion is 25% by weight.
4. The composite coated needle selector of claim 1, further comprising a bonding layer between the thermally sprayed remelted alloy coating and the PVD coating; the bonding layer is a Ti, Cr or Al metal layer or an alloy layer thereof.
5. The composite coating selector of claim 4, wherein the thickness of the bonding layer is 0.05 μm to 1 μm.
6. The composite coating needle selector as claimed in any one of claims 1 to 5, wherein the thickness of the PVD coating is 0.1 μm to 15 μm; the surface hardness of the PVD coating is 1500HV-5000 HV.
7. A preparation method of a needle selector with a composite coating comprises the following steps:
providing a needle selector;
subjecting the selector to ion nitriding treatment to form a nitrided layer;
spraying Cr on the surface of the nitriding layer by adopting a supersonic flame spraying process3C2-Ni-Cr, WC-12Co, WC-12Ni, WC-10Co-4Cr, WC-15Ni, TiC-15Ni or theirCombining the alloy coatings to form a thermal sprayed alloy coating;
remelting the thermally sprayed alloy coating adhered to the surface of the nitrided layer to form a thermally sprayed remelted alloy coating;
and depositing a nano hard coating comprising AlCrN, CrAlN, CrN, AlTiN, TiAlN, TiAlCrN, TiSiN, TiSiAlN, TiAlWN or a combination thereof on the surface of the hot spraying remelting alloy coating subjected to remelting treatment by adopting a Physical Vapor Deposition (PVD) process to form the PVD coating.
8. The method of making a composite coated needle selector of claim 7 wherein the thermally sprayed remelted alloy coating is comprised of Cr3C2-an alloy coating of Ni-Cr and the PVD coating is a nano hard coating comprising AlCrN.
9. The method for preparing a composite coating selector as claimed in claim 8, wherein the Cr is3C2Is 75% by weight, and the Ni-Cr proportion is 25% by weight.
10. The needle selector for composite coating as described in claim 7, further comprising the steps of forming a bonding layer on the surface of said thermally sprayed remelted alloy coating by PVD process after remelting said thermally sprayed alloy coating, and then depositing said PVD coating on the surface of said bonding layer by PVD process; wherein the bonding layer is a metal layer of Ti, Cr or Al or an alloy layer thereof.
11. The needle selector for preparing composite coatings according to claim 7 or 10, wherein the remelting treatment is carried out by using a laser with power of 500-1000W, spot diameter of 3-5mm, and moving speed of 0.5-3 m/min.
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