CN103276276B - High-entropy alloy coating that a kind of VC strengthens and preparation method thereof - Google Patents
High-entropy alloy coating that a kind of VC strengthens and preparation method thereof Download PDFInfo
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Abstract
High-entropy alloy coating that a kind of VC strengthens and preparation method thereof, belongs to coating technology field.High-entropy alloy matrix by mole% VC and 65%-99.9% by 0.1%-35% forms; High-entropy alloy matrix is CrCoCuFeMnNi, and its composition is: Cr:5-35at.%; Co:5-35at.%; Fe:5-35at.%; Mn:5-35at.%; Ni:5-35at.%; Cu:5-35at.%.Adopt in-situ synthetic method or the preparation of Ex-situ sythesis method.Invention increases the mechanical property of material.
Description
Technical field
The invention belongs to coating technology field, relate to the high-entropy alloy coating that a kind of VC strengthens, the invention still further relates to a kind of method adopting plasma cladding to prepare this coating.
Background technology
High-entropy alloy is a kind of brand-new alloy designs theory, and its constituent element number is defined between 5-13, and the atomic percentage conc of often kind of constituent element is between 5%-35%.Because metallic element in alloy kind is many, the randomness of Atomic Arrangement is large, and high entropy effect facilitates the mixing between element, alloy phase is formed and is tending towards simple body-centered cubic or face-centred cubic structure, or the mixed structure of the two, and the formation suppressing the intermetallic compound of fragility.High-entropy alloy has very excellent mechanical property, such as, have that high rigidity, high temperature resistance are softening, a characteristic such as high temperature oxidation resisting, corrosion-resistant and high resistivity, has and is widely used, the advantage of application potential diversification.
The current research about high-entropy alloy is mainly limited to the combination between alloy heterogeneity, and preparation method also mainly adopts vacuum arc fumace fusion casting.High-entropy alloy has very excellent mechanical property, high-entropy alloy is introduced material surface field, for material surface modifying, is of great practical significance.In high-entropy alloy coating, add VC as wild phase, can effectively improve the mechanical properties such as the hardness of high-entropy alloy coating, play the application potential of high-entropy alloy.Believe that the high-entropy alloy coating that this VC strengthens has very wide application prospect.The bonding strength of coating and the base material of preparation is high, and surface quality is excellent, and comprehensive mechanical property is stable, durable.
Summary of the invention
The object of this invention is to provide the high-entropy alloy coating that a kind of VC strengthens, obtain the coating that mechanical property is better than high-entropy alloy matrix.
For achieving the above object, the present invention adopts following technical scheme.
The high-entropy alloy coating that VC strengthens, is characterized in that, by mole% by the preferred 1%-20% of the VC(of 0.1%-35%) and the high-entropy alloy matrix of 65%-99.9% form; High-entropy alloy matrix is CrCoCuFeMnNi, and its composition is: Cr:5-35at.%; Co:5-35at.%; Fe:5-35at.%; Mn:5-35at.%; Ni:5-35at.%; Cu:5-35at.%.
The above-mentioned high-entropy alloy coating containing VC enhancing adopts in-situ synthetic method or the preparation of Ex-situ sythesis method.
Adopt the method for plasma cladding to prepare the high-entropy alloy coating of carbide-containing enhancing, it is characterized in that, adopt the method directly adding VC, carry out according to the following steps:
A) pretreatment of base material, base material preferably uses soft steel, and pretreatment of base material comprises removes oxide compound and surface cleaning; Wherein, remove oxide compound and adopt the mechanical means such as turning, polishing, until expose metalluster; Surface cleaning can be cleaned by the heat alkali liquid such as metal cleaner, sodium hydroxid and alcohol, acetone and other organic solvent;
B) prepare starting material, take each pantogen material needed for VC material and high-entropy alloy matrix, then in powdered alloy, add appropriate slag former, slag former add-on is the 5-15wt.% of powdered alloy; Consisting of of slag former: rutile: 50-100wt.%; Fluorite: 0-25wt.%; Mica: 0-25wt.%;
C) mixed powder, puts into mixed powder machine and mixes by the raw material in step b).
D) prepare high-entropy alloy coating, the processing parameter adopting plasma spraying welding equipment to prepare coating is: untransferable arc voltage: 18-21V; Untransferable arc electric current: 58-63A; Transferred arc voltage: 29-32V; Transferred arc electric current: 100-130A; Powder feeding voltage: 4.0-5.5V; Ion-gas: 200-350L/h; Powder feeding gas: 300-600L/h; Protection gas: 360-450L/h; Surfacing speed: 25-30mm/min; The welding gun amplitude of oscillation: 15-25mm; Spray distance: 10-15mm.
The present invention is preferred, and in step b), the composition of slag former comprises rutile, fluorite and mica three kinds of materials.Because the surface tension of liquid high-entropy alloy is excessive, very large with the wetting angle angle of base material, cannot well at substrate surface generation epitaxial solidification, shaping not good.Slag former can reduce the surface tension of liquid droplets, and cladding can form skull at clad layer surface after terminating, not residual in cladding layer.Namely slag former improves shaping, does not affect coated component again.
The present invention is preferred, and when adopting fabricated in situ wild phase, in step b), the transition of carbon adopts carbon ferrochrome (comprising high carbon ferro-chrome, medium carbon ferrochrome, low carbon ferrochromium), and does not adopt graphite.The transition of v element adopts vanadium iron (preferably containing the V of 50%, the Fe of 50%), and then take other each pantogen materials needed for high-entropy alloy matrix, raw materials used purity requirement is more than 99%, and granularity is between 80 order-300 orders.
The present invention is preferred, and in described step d), described ion-gas, protection gas, powder feeding gas are argon gas.In order to reduce the impact of base material on high-entropy alloy coating, adopt identical processing parameter, repeat cladding process, make cladding layer reach more than 4 layers, coat-thickness reaches 8-10mm, to avoid base material on the impact of coating.
VC adds the microstructure changing matrix significantly, VC is evenly distributed on matrix can hinder dislocation motion effectively, thus cause piling up of dislocations and dislocation tangling, play the effect of particle reinforce, make the intensity of coating, hardness is effectively improved.
Principal feature of the present invention is: be matrix with high-entropy alloy, and using VC as wild phase, the high-entropy alloy-base composite material comprehensive mechanical property of preparation obtains strengthening.Wild phase adds in the generation of high-entropy alloy matrix situ or outside.The present invention further increases the mechanical property of material on the basis of original high-entropy alloy, the hardness ratio high-entropy alloy matrix of high-entropy alloy coating that carbide strengthens has had and has significantly improved, the great potentiality playing high-entropy alloy, and make this emerging materials application of high-entropy alloy become possibility in field of surface modification, the high-entropy alloy coating that the carbide that can be used for preparing satisfied different operating mode strengthens.
Accompanying drawing explanation
Fig. 1 prepares the process figure that VC strengthens high-entropy alloy coating process in the embodiment of the present invention;
Fig. 2 is CrCoCuFeMnNi-(VC) in embodiment 1
0.2coating stereoscan photograph (BSE), wherein " 1 " is matrix, and " 2 " are VC;
Fig. 3 is CrCoCuFeMnNi-(VC) in embodiment 1
0.4coating stereoscan photograph (BSE), wherein " 1 " is matrix, and " 2 " are VC.
Embodiment
The present invention is explained in detail in conjunction with the embodiments, can be easy to be readily appreciated by one skilled in the art, but the present invention is not limited to following examples to make advantages and features of the invention.
Embodiment 1
The high-entropy alloy coating that VC strengthens, its composition is CrCoCuFeMnNi-(VC)
0.2, the method that VC adds matrix is fabricated in situ.The high-entropy alloy coating adopting the method preparation of plasma cladding to strengthen containing VC, carry out according to the following steps:
A) pretreatment of base material, first, mild steel plate being cut into thickness is 10mm, and width is 100mm, and length is the sheet material of 2000mm; Then, with milling machine, carbon steel sheet surface is cut, remove zone of oxidation, until expose metalluster; Then, carry out cleaning by degreasing to carbon steel sheet, grease-removing agent main component is potassium hydroxide, and uses organic complexing agent as cleaning additive, and during cleaning, temperature controls, at about 25 DEG C, to rinse after cleaning with clear water; Finally dry with alcohol wipe surface of steel plate, for subsequent use.
B) raw material is prepared, according to CrCoCuFeMnNi-(VC)
0.2component proportions choose the metal-powder of respective element, the transition of carbon adopts high carbon ferro-chrome (containing the C of 7%, the Fe of 30%, the Cr of 63%), and the transition of v element adopts vanadium iron (containing the V of 50%, the Fe of 50%).And in powdered alloy, adding the slag former of 10wt.%, slag former composition is: rutile: 60wt.%; Fluorite: 20wt.%; Mica: 20wt.%.Powder required for accurate weighing, the purity of powder is more than 99%, and granularity is between 80 order-300 orders.Powdered alloy composition is as shown in table 1 below:
Table 1 alloy raw material composition quality
C) mixed powder, by the various powder of accurately weighing, loads successively in mixed powder machine and mixes powder to ensure that powder mixes.
D) high-entropy alloy coating is prepared.The powdered alloy mixed is loaded in powder feeder, adopts plasma spraying welding equipment to carry out cladding operation.Protection gas, ion-gas and powder feeding gas used are argon gas, and concrete technology parameter is: untransferable arc voltage: 18V; Untransferable arc electric current: 60A; Transferred arc voltage: 29V; Transferred arc electric current: 110A; Powder feeding voltage: 5.5V; Ion-gas: 350L/h; Powder feeding gas: 540L/h; Protection gas: 400L/h; Surfacing speed: 30mm/min; The welding gun amplitude of oscillation: 15mm; Spray distance: 10mm.Adopt identical processing parameter, repeat cladding process, make cladding layer reach more than 4 layers, coat-thickness reaches 8-10mm, to avoid base material on the impact of coating.
Embodiment 2
The high-entropy alloy coating that VC strengthens, its composition is CrCoCuFeMnNi-(VC)
0.3, the method that VC adds matrix is fabricated in situ.The high-entropy alloy coating adopting the method preparation of plasma cladding to strengthen containing VC, carry out according to the following steps:
A) pretreatment of base material, first, mild steel plate being cut into thickness is 10mm, and width is 100mm, and length is the sheet material of 2000mm; Then, with milling machine, carbon steel sheet surface is cut, remove zone of oxidation, until expose metalluster; Then, carry out cleaning by degreasing to carbon steel sheet, grease-removing agent main component is potassium hydroxide, and uses organic complexing agent as cleaning additive, and during cleaning, temperature controls, at about 25 DEG C, to rinse after cleaning with clear water; Finally dry with alcohol wipe surface of steel plate, for subsequent use.
B) raw material is prepared, according to CrCoCuFeMnNi-(VC)
0.3component proportions choose the metal-powder of respective element, the transition of carbon adopts high carbon ferro-chrome (containing the C of 7%, the Fe of 30%, the Cr of 63%), and the transition of v element adopts vanadium iron (containing the V of 50%, the Fe of 50%).And in powdered alloy, adding the slag former of 10wt.%, slag former composition is: rutile: 70wt.%; Fluorite: 15wt.%; Mica: 15wt.%.Powder required for accurate weighing, the purity of powder is more than 99%, and granularity is between 80 order-300 orders.Powdered alloy composition is as shown in table 2 below:
Show 2-in-1 golden composition of raw material quality
C) mixed powder, by the various powder of accurately weighing, loads successively in mixed powder machine and mixes powder to ensure that powder mixes.
D) high-entropy alloy coating is prepared.The powdered alloy mixed is loaded in powder feeder, adopts plasma spraying welding equipment to carry out cladding operation.Protection gas, ion-gas and powder feeding gas used are argon gas, and concrete technology parameter is: untransferable arc voltage: 18V; Untransferable arc electric current: 60A; Transferred arc voltage: 29V; Transferred arc electric current: 120A; Powder feeding voltage: 5.5V; Ion-gas: 330L/h; Powder feeding gas: 550L/h; Protection gas: 360L/h; Surfacing speed: 30mm/min; The welding gun amplitude of oscillation: 15mm; Spray distance: 11mm.Adopt identical processing parameter, repeat cladding process, make cladding layer reach more than 4 layers, coat-thickness reaches 8-10mm, to avoid base material on the impact of coating.
Embodiment 3
The high-entropy alloy coating that VC strengthens, its composition is CrCoCuFeMnNi-(VC)
0.4, the method that VC adds matrix is fabricated in situ.The high-entropy alloy coating adopting the method preparation of plasma cladding to strengthen containing VC, carry out according to the following steps:
A) pretreatment of base material, first, mild steel plate being cut into thickness is 10mm, and width is 100mm, and length is the sheet material of 2000mm; Then, with milling machine, carbon steel sheet surface is cut, remove zone of oxidation, until expose metalluster; Then, carry out cleaning by degreasing to carbon steel sheet, grease-removing agent main component is potassium hydroxide, and uses organic complexing agent as cleaning additive, and during cleaning, temperature controls, at about 25 DEG C, to rinse after cleaning with clear water; Finally dry with alcohol wipe surface of steel plate, for subsequent use.
B) raw material is prepared, according to CrCoCuFeMnNi-(VC)
0.4component proportions choose the metal-powder of respective element, the transition of carbon adopts high carbon ferro-chrome (containing the C of 7%, the Fe of 30%, the Cr of 63%), and the transition of v element adopts vanadium iron (containing the V of 50%, the Fe of 50%).And in powdered alloy, adding the slag former of 15wt.%, slag former composition is: rutile: 80wt.%; Fluorite: 10wt.%; Mica: 10wt.%.Powder required for accurate weighing, the purity of powder is more than 99%, and granularity is between 80 order-300 orders.Powdered alloy composition is as shown in table 3 below:
Table 3 alloy raw material composition quality
C) mixed powder, by the various powder of accurately weighing, loads successively in mixed powder machine and mixes powder to ensure that powder mixes.
D) high-entropy alloy coating is prepared.The powdered alloy mixed is loaded in powder feeder, adopts plasma spraying welding equipment to carry out cladding operation.Protection gas, ion-gas and powder feeding gas used are argon gas, and concrete technology parameter is: untransferable arc voltage: 18V; Untransferable arc electric current: 60A; Transferred arc voltage: 29V; Transferred arc electric current: 115A; Powder feeding voltage: 5.5V; Ion-gas: 330L/h; Powder feeding gas: 580L/h; Protection gas: 400L/h; Surfacing speed: 30mm/min; The welding gun amplitude of oscillation: 15mm; Spray distance: 13mm.Adopt identical processing parameter, repeat cladding process, make cladding layer reach more than 4 layers, coat-thickness reaches 8-10mm, to avoid base material on the impact of coating.
Embodiment 4
The high-entropy alloy coating that VC strengthens, its composition is CrCoCu
1.2feMn
0.8ni-(VC)
0.3, VC adds the method for matrix for directly to add.The high-entropy alloy coating adopting the method preparation of plasma cladding to strengthen containing VC, carry out according to the following steps:
A) pretreatment of base material, first, mild steel plate being cut into thickness is 10mm, and width is 100mm, and length is the sheet material of 2000mm; Then, with milling machine, carbon steel sheet surface is cut, remove zone of oxidation, until expose metalluster; Then, carry out cleaning by degreasing to carbon steel sheet, grease-removing agent main component is potassium hydroxide, and uses organic complexing agent as cleaning additive, and during cleaning, temperature controls, at about 25 DEG C, to rinse after cleaning with clear water; Finally dry with alcohol wipe surface of steel plate, for subsequent use.
B) raw material is prepared, according to CrCoCu
1.2feMn
0.8ni-(VC)
0.3component proportions choose the metal-powder of respective element, the feed postition of vanadium carbide for directly to add vanadium carbide particle in mixed powder.And in powdered alloy, adding the slag former of 10wt.%, slag former composition is: rutile: 50wt.%; Fluorite: 25wt.%; Mica: 25wt.%.Powder required for accurate weighing, the purity of powder is more than 99%, and granularity is between 80 order-300 orders.Powdered alloy composition is as shown in table 4 below:
Table 4 alloy raw material composition quality
C) mixed powder, by the various powder of accurately weighing, loads successively in mixed powder machine and mixes powder to ensure that powder mixes.
D) high-entropy alloy coating is prepared.The powdered alloy mixed is loaded in powder feeder, adopts plasma spraying welding equipment to carry out cladding operation.Protection gas, ion-gas and powder feeding gas used are argon gas, and concrete technology parameter is: untransferable arc voltage: 18V; Untransferable arc electric current: 60A; Transferred arc voltage: 29V; Transferred arc electric current: 110A; Powder feeding voltage: 5.5V; Ion-gas: 300L/h; Powder feeding gas: 600L/h; Protection gas: 420L/h; Surfacing speed: 30mm/min; The welding gun amplitude of oscillation: 15mm; Spray distance: 12mm.Adopt identical processing parameter, repeat cladding process, make cladding layer reach more than 4 layers, coat-thickness reaches 8-10mm, to avoid base material on the impact of coating.
Embodiment 5
The high-entropy alloy coating that VC strengthens, its composition is CrCoCuFe
1.4mnNi-(VC)
0.5, VC adds the method for matrix for directly to add.The high-entropy alloy coating adopting the method preparation of plasma cladding to strengthen containing VC, carry out according to the following steps:
A) pretreatment of base material, first, mild steel plate being cut into thickness is 10mm, and width is 100mm, and length is the sheet material of 2000mm; Then, with milling machine, carbon steel sheet surface is cut, remove zone of oxidation, until expose metalluster; Then, carry out cleaning by degreasing to carbon steel sheet, grease-removing agent main component is potassium hydroxide, and uses organic complexing agent as cleaning additive, and during cleaning, temperature controls, at about 25 DEG C, to rinse after cleaning with clear water; Finally dry with alcohol wipe surface of steel plate, for subsequent use.
B) raw material is prepared, according to CrCoCuFe
1.4mnNi-(VC)
0.5component proportions choose the metal-powder of respective element, the feed postition of vanadium carbide for directly to add vanadium carbide particle in mixed powder.And in powdered alloy, adding the slag former of 12wt.%, slag former composition is: rutile: 70wt.%; Fluorite: 15wt.%; Mica: 15wt.%.Powder required for accurate weighing, the purity of powder is more than 99%, and granularity is between 80 order-300 orders.Powdered alloy composition is as shown in table 5 below:
Table 5 alloy raw material composition quality
C) mixed powder, by the various powder of accurately weighing, loads successively in mixed powder machine and mixes powder to ensure that powder mixes.
D) high-entropy alloy coating is prepared.The powdered alloy mixed is loaded in powder feeder, adopts plasma spraying welding equipment to carry out cladding operation.Protection gas, ion-gas and powder feeding gas used are argon gas, and concrete technology parameter is: untransferable arc voltage: 18V; Untransferable arc electric current: 60A; Transferred arc voltage: 29V; Transferred arc electric current: 115A; Powder feeding voltage: 5.5V; Ion-gas: 350L/h; Powder feeding gas: 550L/h; Protection gas: 400L/h; Surfacing speed: 30mm/min; The welding gun amplitude of oscillation: 15mm; Spray distance: 12mm.Adopt identical processing parameter, repeat cladding process, make cladding layer reach more than 4 layers, coat-thickness reaches 8-10mm, to avoid base material on the impact of coating.
Embodiment 6
The high-entropy alloy coating that VC strengthens, its composition is Cr
0.8co
1.2cuFeMnNi-(VC)
0.6, VC adds the method for matrix for directly to add.The high-entropy alloy coating adopting the method preparation of plasma cladding to strengthen containing VC, carry out according to the following steps:
A) pretreatment of base material, first, mild steel plate being cut into thickness is 10mm, and width is 100mm, and length is the sheet material of 2000mm; Then, with milling machine, carbon steel sheet surface is cut, remove zone of oxidation, until expose metalluster; Then, carry out cleaning by degreasing to carbon steel sheet, grease-removing agent main component is potassium hydroxide, and uses organic complexing agent as cleaning additive, and during cleaning, temperature controls, at about 25 DEG C, to rinse after cleaning with clear water; Finally dry with alcohol wipe surface of steel plate, for subsequent use.
B) raw material is prepared, according to Cr
0.8co
1.2cuFeMnNi-(VC)
0.6component proportions choose the metal-powder of respective element, the feed postition of vanadium carbide for directly to add vanadium carbide particle in mixed powder.And in powdered alloy, adding the slag former of 15wt.%, slag former composition is: rutile: 70wt.%; Fluorite: 15wt.%; Mica: 15wt.%.Powder required for accurate weighing, the purity of powder is more than 99%, and granularity is between 80 order-300 orders.Powdered alloy composition is as shown in table 6 below:
Table 6 alloy raw material composition quality
C) mixed powder, by the various powder of accurately weighing, loads successively in mixed powder machine and mixes powder to ensure that powder mixes.
D) high-entropy alloy coating is prepared.The powdered alloy mixed is loaded in powder feeder, adopts plasma spraying welding equipment to carry out cladding operation.Protection gas, ion-gas and powder feeding gas used are argon gas, and concrete technology parameter is: untransferable arc voltage: 18V; Untransferable arc electric current: 60A; Transferred arc voltage: 29V; Transferred arc electric current: 110A; Powder feeding voltage: 5.5V; Ion-gas: 350L/h; Powder feeding gas: 550L/h; Protection gas: 400L/h; Surfacing speed: 30mm/min; The welding gun amplitude of oscillation: 15mm; Spray distance: 12mm.Adopt identical processing parameter, repeat cladding process, make cladding layer reach more than 4 layers, coat-thickness reaches 8-10mm, to avoid base material on the impact of coating.
The high-entropy alloy coating performance that VC prepared in embodiment 1-3 strengthens detects following describing:
Adopt HXD-1000 digital micro-analysis sclerometer to carry out Vickers' hardness test to coating, experiment load is 300gf, and the load dwell time is 10S, and end-result gets 5 average value measured, to ensure the accuracy measured.Preparation method of sample is as follows: adopt Linear cut along the cross section taken 15mm × 15mm × 10mm sample of cladding layer, then by the surface of sample successively through 200#, 400#, 600#, 800#, 1000# water-proof abrasive paper grinds, and carries out polished finish to ensure the accuracy of numerical value.
Table 7 embodiment 1-3 floating coat microhardness (HV)
Wherein, plasma cladding CrCoCuFeMnNi coating nominal composition is as shown in table 8,
Table 8 coating nominal composition
Claims (3)
1. a method for the high-entropy alloy coating of VC enhancing, it is characterized in that, the high-entropy alloy matrix by mole% VC and 65%-99.9% by 0.1%-35% forms; High-entropy alloy matrix is CrCoCuFeMnNi, and its composition is: Cr:5-35at.%; Co:5-35at.%; Fe:5-35at.%; Mn:5-35at.%; Ni:5-35at.%; Cu:5-35at.%; The molar content of VC is 1%-20%; Carry out according to the following steps:
A) pretreatment of base material, soft steel selected by base material, and pretreatment of base material comprises removes oxide compound and surface cleaning;
B) prepare starting material, take each pantogen material needed for VC material and high-entropy alloy matrix, then in powdered alloy, add appropriate slag former, slag former add-on is the 5-15wt.% of powdered alloy; Consisting of of slag former: rutile: 50-100wt.%; Fluorite: 0-25wt.%; Mica: 0-25wt.%;
C) mixed powder, by step b) in raw material put into mixed powder machine and mix;
D) prepare high-entropy alloy coating, the processing parameter adopting plasma spraying welding equipment to prepare coating is: untransferable arc voltage: 18-21V; Untransferable arc electric current: 58-63A; Transferred arc voltage: 29-32V; Transferred arc electric current: 100-130A; Powder feeding voltage: 4.0-5.5V; Ion-gas: 200-350L/h; Powder feeding gas: 300-600L/h; Protection gas: 360-450L/h; Surfacing speed: 25-30mm/min; The welding gun amplitude of oscillation: 15-25mm; Spray distance: 10-15mm.
2. according to the method for claim 1, it is characterized in that, raw materials used purity requirement is more than 99%, and granularity is between 80 order-300 orders.
3., according to the method for claim 1 or 2, it is characterized in that, step b) in the transition of carbon adopt carbon ferrochrome, the transition of v element adopts vanadium iron, then takes other each pantogen materials needed for high-entropy alloy matrix.
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