CN106637045A - Technique for preparing Co-based WC coating on metal surface - Google Patents
Technique for preparing Co-based WC coating on metal surface Download PDFInfo
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- CN106637045A CN106637045A CN201611174175.XA CN201611174175A CN106637045A CN 106637045 A CN106637045 A CN 106637045A CN 201611174175 A CN201611174175 A CN 201611174175A CN 106637045 A CN106637045 A CN 106637045A
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- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/07—Alloys based on nickel or cobalt based on cobalt
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
-
- 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
- C23C4/18—After-treatment
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention relates to a technique for preparing a Co-based WC coating on a metal surface. The technique for preparing the Co-based WC coating on the metal surface comprises the steps that mixed powder which comprises Co-based powder and WC powder is prepared; the surface of a metal matrix is pretreated; the mixed powder is sprayed on the treated surface of the metal matrix through the plasma spraying technique, so that the Co-based WC coating is formed on the surface of the metal matrix; and laser remelting treatment is conducted on the formed Co-based WC coating, so that a compact Co/WC coating which is metallurgically bonded with the metal matrix is obtained on the metal surface. According to the technique for preparing the Co-based WC coating on the metal surface, Co-based alloy is used as a bonding matrix, and the defect that an obtained coating is prone to breakage due to the fact that the sinterability of WC is poor is overcome; and meanwhile, the plasma spraying technique and the laser remelting technique are combined, and thus the Co-based WC coating obtained on the metal surface has the advantages of being uniform, compact, not prone to breakage, and capable of being metallurgically bonded with the metal matrix.
Description
Technical field
The present invention relates to metal material surface handling process, more particularly to a kind of metal surface prepares the work of Co base WC coatings
Process.
Background technology
Metal material as the most popular engineering material of modern society, its under arms during, tend to produce
Heat fatigue is worn and torn or is corroded by corrosive medium, and this will result directly in the failure of metal material, therefore in practical application, is led to
Often metal base surface is applied coating to extend its working life.In view of tungsten carbide (WC) non-oxidizability is strong, hardness is high, wear-resisting
Corrosion resistance is good and the features such as little thermal coefficient of expansion, numerous researchs are by technologies such as thermal spraying, laser melting coating, pulsed electrode depositions
Method, improves matrix wearability, corrosion resistance etc., so as to further as coating material deposition in metal component surface
Improve the actual application value of metal material.
But the fusing point of WC is higher, fragility is larger, although the coating uniformity obtained using plasma spraying is good, receives
Adhesion affects, and obscission often easily occurs.And laser melting and coating technique method can generally realize coating with metallic matrix
Metallurgical binding, meets the requirement of adhesion, but due in laser cladding process heating and cooldown rate be exceedingly fast, cladding layer and matrix
Between thermal coefficient of expansion difference, be easily caused cladding coating be partially formed micro-crack or deformation the shortcomings of.Therefore, using single painting
The coating that layer preparation means are obtained can not often meet the application request of coating, and this constrains to a certain extent WC paintings
The performance of the bigger performance of layer.
In view of the foregoing, Co base WC are prepared in the urgent need to developing a kind of metal surface for solving above-mentioned technical problem
The process of coating.
The content of the invention
The object of the invention aims to solve the problem that deficiency of the prior art, proposes a kind of by adding Co based alloys in WC coatings
It is larger to make up tungsten carbide (WC) fragility itself as Binder Phase, the coating for being obtained easily occur fracture, hole the shortcomings of, and
It is real while ensureing that WC coating uniforms are attractive in appearance with reference to plasma spraying and the advantage of two kinds of preparation technology of coating of laser melting coating
WC coatings and metallic matrix metallurgical binding are showed.
For achieving the above object, the invention provides a kind of metal surface prepares the process of Co base WC coatings.The party
Method is comprised the following steps：
A, the configuration for carrying out mixed-powder, the mixed-powder includes Co based powders and WC powder；
B, metal base surface is pre-processed；
C, using plasma spray coating process by the mixed-powder in step a be sprayed on step b process after metal base surface on,
To form Co base WC coatings in metal base surface；
D, laser remolten process is carried out to the Co base WC coatings in step c, with metal surface obtain with matrix in metallurgical binding,
Fine and close Co/WC coatings.
Preferably, step a specifically includes following steps：
E, Co based powders and WC powder are carried out respectively ball milling granulation process；
F, by step e ball milling granulation after Co based powders and WC powder mechanical mixture it is uniform.
It is further preferred that step e is specifically included：Respectively by two kinds of powder respectively with dissolving after polyvinyl alcohol
(PVA) 15 are pressed:1 mass fraction is dried than mixing Jing after ball milling, pulverizes, and step by step sieve takes using 100#, 200# sieve,
Retain Co based powders and WC powder that particle diameter is 100-200#.
It is further preferred that step f is specifically included：By Co based powders and WC powder after ball milling granulation in step e
Mix by mass fraction percentage, wherein Co based powders are 60.0-80.0 wt.%, WC powder is 20.0-40.0 wt.%, and Jing machines
Tool is stand-by after being well mixed.
Preferably, the metallic matrix in step b includes the one kind in carbon steel, stainless steel or titanium alloy.
Preferably, step b is specifically included：Metallic matrix Jing 180-500#SiC sand paperings are processed, and uses acetone
Cleaning oil removing, subsequently to its surface sand-blasting process 4-8min, until metal surface loses metallic luster, and is cleaned with acetone again
Oil removing.
Preferably, the material spray of the blasting treatment adopts corundum sand.
Preferably, the parameter of spraying coating process is in step c：Distance is 90-110mm between spray gun and metallic matrix；Deng
Plasma spray power is 80-90kW；Argon gas flow velocity is 40-48L/min；Hydrogen flow rate is 13-19L/min；Powder feeding rate is 25-
30g/min。
Preferably, the parameter of laser remolten process is in step d：Nitrogen flow rate is 20L/min；Laser melting coating power
For 70-85W/mm2；Cladding frequency is 8-10Hz；Electric current pulsewidth is 6-8 μ s；Electric current is 220A；Sweep speed is 3-8mm/s.
Effective effect of the present invention：Using Co based alloys as bonding matrix, WC is overcome because agglutinating property is poor, acquisition
The shortcomings of coating easy fracture；In combination with plasma spraying and the advantage of two kinds of technologies of laser melting coating, obtain in metal surface
One layer of even compact, not easy fracture, and with Co base WC coating of the matrix in metallurgical binding.The coating significantly improves Metal Substrate
The scratch-resistant performance of body, and can effectively stop the infiltration of corrosive medium in sour environment, metal material surface characteristics are carried
Height has very high practical value, can be applicable to the surfacecti proteon of metal material and the field such as wear-resisting.
Description of the drawings
Fig. 1 is the process method flow chart that a kind of metal surface of the present invention prepares Co base WC coatings.
Specific embodiment
In order that those skilled in the art are better understood from the technical scheme in the embodiment of the present invention, and make of the invention real
Applying the above-mentioned purpose of example, feature and advantage can become apparent from understandable technology below by drawings and Examples, to the present invention
Scheme is described in further detail.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
Property work under the premise of all other embodiment for being obtained, belong to the scope of protection of the invention.
Fig. 1 is the process method flow chart that a kind of metal surface of the present invention prepares Co base WC coatings.
As shown in figure 1, the process that a kind of metal surface of the present invention prepares Co base WC coatings is comprised the following steps：
In a step 101, the configuration of mixed-powder is carried out, the mixed-powder includes Co based powders and WC powder.
In a step 102, metal base surface is pre-processed, the metallic matrix is that carbon steel, stainless steel or titanium are closed
One kind in gold.
In step 103, the mixed-powder in step 101 is sprayed on into step 102 using plasma spray coating process to process
On metal base surface afterwards, with the pre-prepared one layer of Co base WC coatings of metal base surface.
At step 104, laser remolten process is carried out to the pre-prepared Co base WC coatings in step 103, with metal
Surface is obtained with matrix in metallurgical binding, fine and close Co/WC coatings.
Specifically, above-mentioned steps 101 specifically include following steps：
Co based powders and WC powder are carried out into respectively ball milling granulation process.Co based powders are with WC powder ball milling granulation process：Point
Two kinds of powder are not pressed into 15 with the polyvinyl alcohol (PVA) after dissolving respectively:1 mass fraction is dried than mixing Jing after ball milling, grinds
Grinds, and using 100#, 200# sieve, step by step sieve takes, and retains Co based powders and WC powder that particle diameter is 100-200#.
Co based powders after above-mentioned ball milling is granulated are uniform with WC powder mechanical mixture.Co based powders mixed with WC powder
Cheng Wei：Co based powders after ball milling is granulated are mixed with WC powder by mass fraction percentage, and wherein Co based powders are 60.0-
80.0 wt.%, WC powder is 20.0-40.0 wt.%, and stand-by Jing after mechanical mixture is uniform.
Pretreatment of metal surface technique is specially in above-mentioned steps 102：By metallic matrix Jing 180-500#SiC sand paperings
Process, and oil removing is cleaned with acetone, subsequently 4-8min is processed to its surface sand-blasting (corundum sand), until metal surface loses gold
Category gloss, and with acetone clean oil removing again.
Spraying of the plasma spray coating process in the pre-prepared Co bases WC coatings of metal base surface is adopted in above-mentioned steps 103
Parameter is：Distance is 90-110mm between spray gun and metallic matrix；Plasma spraying power is 80-90kW；Argon gas flow velocity is 40-
48L/min；Hydrogen flow rate is 13-19L/min；Powder feeding rate is 25-30g/min.
It is to the technological parameter that pre-prepared Co bases WC coatings carry out laser remolten process in above-mentioned steps 104：Nitrogen flow rate
For 20L/min；Laser melting coating power is 70-85W/mm2；Cladding frequency is 8-10Hz；Electric current pulsewidth is 6-8 μ s；Electric current is
220A；Sweep speed is 3-8mm/s.
In addition, the behavior pattern in order to detect the Co base WC coatings prepared by above-mentioned technique, the present invention can be to preparation
Co base WC coatings carry out Evaluation of Corrosion Resistance and the test of coating fragility.Concrete operations can be as follows：
Erosion analysis：Co base WC coating samples prepared by the present invention are carried out into dynamic potential scanning in 3.5%NaCl solution, is led to
Cross the Assessment of Changes of corrosion potential its corrosion resistance.
Coating fragility is tested：Co base WC coating samples prepared by the present invention are clipped on the vice of the upper cloth of pad, and to examination
Piece makees 90o bendings, until crackle occurs in test piece, further according to number of bends when there is crackle coating fragility is evaluated.
The Co base WC coatings tested through Evaluation of Corrosion Resistance and coating fragility have not easy fracture and corrosion resistant advantage.
The preparation process of the composite coating is illustrated by the following examples.
Respectively Co base alloy powders and WC powder are pressed into 15 with the polyvinyl alcohol (PVA) after dissolving:1 mass fraction is than mixed
Close, Jing planetary ball mill ball milling 2h are dried 24h in air dry oven, be subsequently ground into powder, and using 100# with
200# crosses mesh sieve and sieves step by step and takes, retain particle diameter for 100-200# Co based powders and WC powder.
Metallic matrix is cut from carbon steel, titanium alloy or stainless steel (following instance selects 316L stainless steels) by line
The flat substrates for being cut to into 10mm × 10mm × 3mm are cut, 180-500#SiC sand paperings are processed, and are cleaned with acetone
Oil removing, subsequently processes 4-8min to its surface sand-blasting (corundum sand), until metal surface loses metallic luster, and again with third
Ketone cleans oil removing.
Embodiment one：
This example directly prepares the WC powder after above-mentioned granulation in metal pretreated matrix surface using plasma spraying technology
Coating is obtained, is 95mm by the spray distance between manipulator control spray gun and metallic matrix, and adjust spray power for 85kW,
It is 45L/min to control argon gas flow velocity, and hydrogen flow rate is 18L/min, and powder feeding rate remains 25g/min or so.
The WC coating layer thicknesses that this example is obtained are about 15 μm, and potentiodynamic polarization test shows the coating relative to matrix,
Corrosion potential lifts about 120 mV, and after the bend test of 1-2 time, coating occurs in that obvious crackle, and with obscission.
Embodiment two：
This example is mixed the WC powder after above-mentioned granulation by mass fraction percentage with Co based powders, and wherein Co based powders are
60.0 wt.%, WC powder is 40.0 wt.%, and Jing mechanical mixtures make its uniform.Subsequently by manipulator control spray gun and Metal Substrate
Spray distance between body is 95mm, and adjusts spray power for 80kW, and it is 45L/min to control argon gas flow velocity, and hydrogen flow rate is
18L/min, powder feeding rate remains 28g/min or so.
The Co base WC coating layer thicknesses that this example is obtained are about 18 μm, and potentiodynamic polarization test shows the coating relative to base
Body, corrosion potential lifts about 160 mV, and after the bend test of 4-5 time, coating occurs in that peeling, obscission.Show Co bases
The addition of Binder Phase, advantageously reduces the fragility of WC coatings.
Embodiment three：
This example is mixed the WC powder after above-mentioned granulation by mass fraction percentage with Co based powders, and wherein Co based powders are
60.0 wt.%, WC powder is 40.0 wt.%, and Jing mechanical mixtures make its uniform.By between manipulator control spray gun and metallic matrix
Spray distance be 95mm, and adjust spray power for 80kW, it is 45L/min control argon gas flow velocity, and hydrogen flow rate is 18L/
Min, powder feeding rate remains 28g/min or so.It is about 18 μm of coating in the pre-prepared a layer thickness of matrix surface.Subsequently to coating
Make further Laser Cladding Treatment, laser remolten is carried out in the case where flow velocity is for the nitrogen protection of 20L/min, and it is defeated to adjust laser melting coating
Go out power for 89W/mm2；Cladding frequency is 9Hz；Electric current pulsewidth is 8 μ s；Electric current is 220A；Sweep speed is 8mm/s.
The remelting Co base WC coating layer thicknesses that this example is obtained are about 20 μm, and potentiodynamic polarization test shows that the coating is relative
In matrix, corrosion potential lifts about 280 mV, 10 with the bend test of last time after, coating starts crackle occur, but not
Obscission is produced.Show after laser remolten, Co base WC coatings are remarkably reinforced with basal body binding force.
Example IV：
This example is mixed the WC powder after above-mentioned granulation by mass fraction percentage with Co based powders, and wherein Co based powders are
80.0 wt.%, WC powder is 20.0 wt.%, and Jing mechanical mixtures make its uniform.By between manipulator control spray gun and metallic matrix
Spray distance be 90mm, and adjust spray power for 80kW, it is 42L/min control argon gas flow velocity, and hydrogen flow rate is 18L/
Min, powder feeding rate remains 28g/min or so.It is about 18 μm of coating in the pre-prepared a layer thickness of matrix surface.Subsequently to coating
Make further Laser Cladding Treatment, laser remolten is carried out in the case where flow velocity is for the nitrogen protection of 20L/min, and it is defeated to adjust laser melting coating
Go out power for 85W/mm2；Cladding frequency is 9Hz；Electric current pulsewidth is 8 μ s；Electric current is 220A；Sweep speed is 5mm/s.
The remelting Co base WC coating layer thicknesses that this example is obtained are about 20 μm, and potentiodynamic polarization test shows that the coating is relative
In matrix, corrosion potential lifts about 260 mV, 15 with the bend test of last time after, coating starts crackle occur, but not
Obscission is produced.Show after laser remolten, Co base WC coatings are remarkably reinforced with basal body binding force.
To sum up, the technique for preparing Co base WC coatings in metal surface that the present invention is provided adopts Co based alloys as bonding base
Body, overcomes WC because agglutinating property is poor, the shortcomings of the coating easy fracture of acquisition；In combination with plasma spraying and laser melting coating
The advantage of two kinds of technologies, obtains one layer of even compact, not easy fracture in metal surface, and is in the Co bases of metallurgical binding with matrix
WC coatings.The coating prepared by the present invention is remarkably improved the scratch-resistant performance of metallic matrix, and can in sour environment
Effectively stop the infiltration of corrosive medium, metal material surface characteristics are improved there is very high practical value.
Above-described specific embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the specific embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, done etc. all should include
Within protection scope of the present invention.
Claims (9)
1. a kind of metal surface prepares the process of Co base WC coatings, it is characterised in that comprise the following steps：
A, the configuration for carrying out mixed-powder, the mixed-powder includes Co based powders and WC powder；
B, metal base surface is pre-processed；
C, using plasma spray coating process by the mixed-powder in step a be sprayed on step b process after metal base surface on,
To form Co base WC coatings in metal base surface；
D, laser remolten process is carried out to the Co base WC coatings in step c, with metal surface obtain with matrix in metallurgical binding,
Fine and close Co/WC coatings.
2. a kind of metal surface according to claim 1 prepares the process of Co base WC coatings, it is characterised in that described
Step a specifically includes following steps：
E, Co based powders and WC powder are carried out respectively ball milling granulation process；
F, by step e ball milling granulation after Co based powders and WC powder mechanical mixture it is uniform.
3. a kind of metal surface according to claim 2 prepares the process of Co base WC coatings, it is characterised in that described
Step e is specifically included：Respectively two kinds of powder are pressed into 15 with the polyvinyl alcohol (PVA) after dissolving respectively:1 mass fraction is than mixed
Close, be dried Jing after ball milling, pulverize, and using 100#, 200# sieve, step by step sieve takes, and retains Co original washing powder of the particle diameter for 100-200#
End and WC powder.
4. a kind of metal surface according to claim 2 prepares the process of Co base WC coatings, it is characterised in that described
Step f is specifically included：Co based powders after ball milling granulation in step e are mixed with WC powder by mass fraction percentage, wherein
Co based powders are 60.0-80.0 wt.%, and WC powder is 20.0-40.0 wt.%, and stand-by Jing after mechanical mixture is uniform.
5. a kind of metal surface according to claim 1 prepares the process of Co base WC coatings, it is characterised in that described
Metallic matrix in step b includes the one kind in carbon steel, stainless steel or titanium alloy.
6. a kind of metal surface according to claim 1 prepares the process of Co base WC coatings, it is characterised in that described
Step b is specifically included：Metallic matrix Jing 180-500#SiC sand paperings are processed, and oil removing is cleaned with acetone, subsequently to its table
Face blasting treatment 4-8min, until metal surface loses metallic luster, and with acetone cleans oil removing again.
7. a kind of metal surface according to claim 6 prepares the process of Co base WC coatings, it is characterised in that described
The material spray of blasting treatment adopts corundum sand.
8. a kind of metal surface according to claim 1 prepares the process of Co base WC coatings, it is characterised in that described
The parameter of spraying coating process is in step c：Distance is 90-110mm between spray gun and metallic matrix；Plasma spraying power is 80-
90kW；Argon gas flow velocity is 40-48L/min；Hydrogen flow rate is 13-19L/min；Powder feeding rate is 25-30g/min.
9. a kind of metal surface according to claim 1 prepares the process of Co base WC coatings, it is characterised in that described
The parameter of laser remolten process is in step d：Nitrogen flow rate is 20L/min；Laser melting coating power is 70-85W/mm2；Cladding frequency
Rate is 8-10Hz；Electric current pulsewidth is 6-8 μ s；Electric current is 220A；Sweep speed is 3-8mm/s.
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| CN201611174175.XA CN106637045A (en) | 2016-12-19 | 2016-12-19 | Technique for preparing Co-based WC coating on metal surface |
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| CN108103502A (en) * | 2018-01-29 | 2018-06-01 | 阳江市五金刀剪产业技术研究院 | A kind of laser cladding powder for martensitic stain less steel |
| CN109136824A (en) * | 2018-11-16 | 2019-01-04 | 常州瑞赛激光技术有限公司 | Plasma hybrid laser paint finishing, spraying method and workpiece |
| CN110257824A (en) * | 2019-07-12 | 2019-09-20 | 江西省科学院应用物理研究所 | A kind of 3D printing method and device of the wear-resisting composite coating of rich chromium cast iron base |
| CN110699626A (en) * | 2019-10-24 | 2020-01-17 | 中国科学院宁波材料技术与工程研究所 | Laser remelting method of thermal spraying metal ceramic coating for cavitation erosion resistance |
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| CN113046601A (en) * | 2021-03-15 | 2021-06-29 | 上海大学 | Tungsten carbide reinforced cobalt-based composite material and application thereof |
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| CN109136824A (en) * | 2018-11-16 | 2019-01-04 | 常州瑞赛激光技术有限公司 | Plasma hybrid laser paint finishing, spraying method and workpiece |
| CN110257824A (en) * | 2019-07-12 | 2019-09-20 | 江西省科学院应用物理研究所 | A kind of 3D printing method and device of the wear-resisting composite coating of rich chromium cast iron base |
| CN110699626A (en) * | 2019-10-24 | 2020-01-17 | 中国科学院宁波材料技术与工程研究所 | Laser remelting method of thermal spraying metal ceramic coating for cavitation erosion resistance |
| CN110923620A (en) * | 2019-12-17 | 2020-03-27 | 武汉铭高新材料有限公司 | Preparation method of high-wear-resistance boride coating for sealing surface of hard sealing valve |
| CN113046601A (en) * | 2021-03-15 | 2021-06-29 | 上海大学 | Tungsten carbide reinforced cobalt-based composite material and application thereof |
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