CN111793781A - Ternary boride metal ceramic solar selective absorption composite coating and preparation method thereof - Google Patents
Ternary boride metal ceramic solar selective absorption composite coating and preparation method thereof Download PDFInfo
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- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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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
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- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S70/00—Details of absorbing elements
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a ternary boride metal ceramic solar selective absorption composite coating and a preparation method thereof, relating to the technical field of metal/ceramic composite material preparation and comprising the following steps: weighing powdery Mo, B, Cr and M according to a proportion, mixing, ball-milling and drying to obtain Mo-B-Cr-M composite powder, wherein M is Co or Ni; adding a binder into the dried Mo-B-Cr-M composite powder, magnetically stirring until the mixture is uniformly mixed, and then drying, crushing and sieving the mixture; and spraying the screened Mo-B-Cr-M composite powder on the surface of a base material by adopting a supersonic flame spraying technology to obtain a MoB/CoCr or MoB/NiCr metal ceramic coating. The invention obtains CoMoB and CoMo through supersonic flame spraying in-situ reaction of Mo, B, Cr and Ni or Co2B2Or NiMo2B2The ternary boride is beneficial to reducing the economic cost, and improving the inter-particle and inter-phase interlaminar combination of the coating, and can improve the performance of the coating.
Description
Technical Field
The invention relates to the technical field of metal/ceramic composite material preparation, in particular to a ternary boride metal ceramic solar selective absorption composite coating and a preparation method thereof.
Background
Solar energy is environment-friendly energy, does not pollute the environment, has zero emission of toxic and harmful gases, and is one of ideal clean energy sources at present. The solar spectrum selective absorption coating is a core component for solar energy photo-thermal conversion. However, at present, there are several main factors that restrict the development of solar selective absorbing coatings: firstly, element diffusion and oxidation among various sub-layers of the solar spectrum selective absorption coating can cause the component distribution of the coating to change, particularly new phases formed by diffusion and oxidation among elements of a metal substrate such as Cu, Al, Fe and the like and elements of the absorption layer at high temperature; secondly, the microstructure of the solar spectrum selective absorption coating changes, such as the grain size changes caused by the phenomena of crystallization of amorphous and nanocrystalline tissues at high temperature or recrystallization of grains and the like; and thirdly, the difference of thermal expansion coefficients of the solar spectrum selective absorption coating and the substrate material causes the change of the internal stress of the coating in the heating process, and the phenomena of film layering, cracking, peeling and the like occur under severe conditions, and the holes and the microcracks can become rapid channels for element diffusion, thereby greatly promoting the diffusion and oxidation among elements.
In order to solve the above problems, it has been found that a novel heterogeneous composite material formed by mixing very fine metal or alloy particles into a matrix of a plurality of ceramic phases combines the advantages of thermal conductivity, electrical conductivity, high toughness of metal and high temperature and oxidation resistance of ceramic. For W/Mo-AlN and W/Mo-Al from the 70 th of the 20 th century till now2O3A great deal of research has been conducted and significant progress has been made in the representative cermet composite coatings. CongWang et al, Beijing university of aerospace, uses magnetron sputtering
Method for preparing double-layer gradual change Mo-Al on Stainless Steel (SS) substrate2O3Spectral coating, the coatingIn that
The surface of the coating has severe phenomena of cracking, falling and the like after annealing for 2 to 5 hours in vacuum at 350 to 1000 ℃ or raising the annealing temperature, and the problems of optical performance attenuation and high-temperature cracking of the coating exist after the coating is oxidized and recycled at high temperature. Therefore, a novel solar selective absorption coating material with good high-temperature thermal stability is needed to be selected, and a suitable surface coating preparation technology is combined to finally obtain a solar selective absorption coating with good optical absorption performance and weather resistance, wherein the absorptivity is still 0.91-0.93, the emissivity is 0.19-0.27, but the surface of the coating has severe phenomena of cracking, falling off and the like when the annealing time is prolonged or the annealing temperature is increased. Aiming at the problems of poor thermal stability, high preparation cost and the like of the existing medium-high temperature solar spectrum selective absorption coating, the solar spectrum selective absorption coating suitable for being used under the medium-high temperature condition is prepared by adopting an electroplating method and a conventional plasma spraying method, when the annealing temperature is lower than 600 ℃, the light absorption rate and the heat emissivity of the coating are not obviously changed, the numerical values are about 0.868 and 0.347, and the coating still has no cracking and shedding phenomena at the high temperature of 900 ℃, so that the coating prepared by the method has good thermal stability and has the defect of slightly insufficient high-temperature optical performance.
Disclosure of Invention
In order to solve the problems, the invention provides a ternary boride cermet solar selective absorption composite coating and a preparation method thereof2B2Or NiMo2B2The ternary boride is beneficial to improving the bonding among particles and among phase layers; meanwhile, the prepared ternary boride-based metal ceramic solar selective absorbing coating has good optical absorptivity and high-temperature thermal stability, simple process operation and lower cost, and is particularly suitable for industrial application and popularization.
In order to achieve the purpose, the invention adopts the technical scheme that: a preparation method of a ternary boride cermet solar selective absorption composite coating comprises the following steps:
s1: weighing powdery Mo, B, Cr and M according to a proportion, mixing, ball-milling and drying to obtain Mo-B-Cr-M composite powder, wherein M is Co or Ni;
s2: adding a binder into the dried Mo-B-Cr-M composite powder, magnetically stirring until the mixture is uniformly mixed, and then drying, crushing and sieving the mixture;
s3: and (4) spraying the Mo-B-Cr-M composite powder screened in the step S2 on the surface of a base material by adopting a supersonic flame spraying technology to obtain a MoB/CoCr or MoB/NiCr metal ceramic coating.
Furthermore, the grain diameters of the powdery Mo, Co, Cr and Ni are 15-45 μm, and the grain diameter of the powdery B is 1-5 μm.
Further, the particle size of the sieved Mo-B-Cr-M composite powder is 15-50 μ M.
Furthermore, the binder is polyvinyl alcohol, and the addition amount is 5-10 wt%.
Further, said mMo+BAnd mM+Cr1-3:1, wherein the atomic ratio of Mo to B is 1:1, and the mass ratio of M to Cr is 1: 1.
Further, the base material is 316L stainless steel.
Still further, the method further comprises subjecting the matrix material to a grit blasting roughening pretreatment process.
Furthermore, the process parameters of spraying by the supersonic flame spraying technology are as follows: oxygen is combustion-supporting gas, the flow rate is 322-402L/min, and the pressure is 0.6 MPa; propane is fuel gas, the flow is 36-42L/min, and the pressure is 0.4 MPa; the nitrogen is used as powder feeding gas, the flow is 45L/min, the pressure is 0.55MPa, and the powder feeding rate is 50-80 r/min; the spraying distance is 150-200 mm.
The second technical scheme adopted by the invention is as follows: a ternary boride cermet solar selective absorption composite coating is prepared by the method in any one of the technical schemes.
Further, the thickness of the coating is 100 μm to 200 μm.
The invention has the beneficial effects that:
ternary borides, e.g. CoMoB, CoMo2B2、NiMo2B2The boride has high melting point, high hardness, good abrasion and corrosion resistance and high-temperature oxidation resistance, can bear the cycle impact under severe working environment which is hard to be met by other solar selective absorption coating materials, and in addition, the boride also has good optical property stability, so that the optical absorption and high-temperature thermal stability of the solar selective absorption coating can be improved.
The invention obtains CoMoB and CoMo through supersonic flame spraying in-situ reaction of Mo, B, Cr and Ni or Co2B2Or NiMo2B2Compared with MoB/CoCr or MoB/NiCr powder which is directly sprayed, the ternary boride is beneficial to reducing the economic cost, and improving the interparticle and interphase combination of various phases of the coating, and can improve the performance of the coating.
The invention prepares the CoMoB and the CoMo through in-situ reaction2B2Or NiMo2B2The ternary boride has high melting point, good physical and chemical stability and oxidation resistance, is combined with the good solar energy light absorption and oxidation resistance of transition Co, and Cr is added to increase the binding power of the coating, so that the optical absorption and high-temperature thermal stability of the coating can be improved.
The absorptivity of MoB/CoCr and MoB/NiCr coatings is 0.96-1.12 and 1.10-1.16 respectively at room temperature of 25 ℃, and the emissivity of the MoB/CoCr and MoB/NiCr coatings is 0.080-0.096 and 0.082-0.097 respectively; in addition, the thermal shock resistance cycle times of the MoB/CoCr coating sample at 600 ℃ can reach 180-230 times, and the thermal shock resistance cycle times at 900 ℃ can reach 70-90 times. The thermal shock resistance cycle times of the MoB/NiCr coating sample at 600 ℃ can reach 200-250 times, and the thermal shock resistance cycle times at 900 ℃ can reach 80-100 times.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is an XRD pattern of MoB/CoCr and MoB/NiCr cermet coatings of embodiments of the present invention;
FIG. 2 is a cross-sectional profile of the MoB/CoCr and MoB/NiCr cermet coatings of the embodiments of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A preparation method of a ternary boride cermet solar selective absorption composite coating comprises the following steps:
s11: according to mMo+BAnd mCo+CrWeighing Mo, Cr and Co with the grain diameter of 15-45 mu m and B with the grain diameter of 1-5 mu m according to the ratio of 1:1, wherein the atomic ratio of Mo to B is 1:1, and the mass ratio of Co to Cr is 1: 1; then mechanically mixing according to the ball milling parameters of the rotating speed of 160rpm, the ball milling time of 3 hours and the ball-to-material ratio of 10:1, wherein absolute ethyl alcohol is adopted as a ball milling medium;
s12: and drying the powder which is subjected to ball milling and uniform mixing, adding 5wt% of polyvinyl alcohol as a binder while performing magnetic stirring, putting the powder into a blast drier for drying after the powder and the binder are uniformly stirred, and crushing and screening to obtain the Mo-B-Co-Cr composite powder with the particle size of 15-50 microns.
S13: selecting 316L stainless steel as a spraying substrate, carrying out sand blasting and coarsening treatment on the substrate before spraying, and depositing a MoB/CoCr metal ceramic coating with the thickness of about 200 mu m on the surface of the 316L stainless steel substrate by adopting a supersonic speed flame spraying system, wherein the spraying process parameters are as follows: oxygen is taken as combustion-supporting gas, the flow is 402L/min, and the pressure is 0.6 MPa; propane is used as fuel gas, the flow is 36L/min, and the pressure is 0.4 MPa; nitrogen is used as powder feeding gas, the flow is 45L/min, the pressure is 0.55MPa, and the powder feeding rate is 50 r/min; the spraying distance is 200 mm.
S14: the absorptivity alpha of the coating is 0.96 when the coating is tested in a 0.3-2.5 mu m waveband by adopting a Lamda750 type UV-Vis-NIR spectrophotometer, and the emissivity of the coating is 0.091 when the coating is tested in a 2.5-25 mu m waveband by adopting a Tensor 27 type BRUKER infrared spectrometer; a high-temperature thermal stability test experiment is carried out by adopting a cyclic heating air cooling method, a sample is firstly placed in a muffle furnace with certain stability for heating and heat preservation for 10min, then the sample is taken out to the air for cooling to room temperature, and cyclic operation is repeated, the experimental test shows that the thermal shock resistance cycle times of the coating sample at 600 ℃ can reach 196 times, and the thermal shock resistance cycle times at 900 ℃ can reach 75 times.
The MoB/CoCr cermet coating of example 1 was analyzed by X-ray diffraction and the results are shown in FIG. 1a, where it can be seen that CoMoB and CoMo were formed in situ in the MoB/CoCr cermet coating2B2A ternary boride.
The results of the texture morphology analysis of the MoB/CoCr cermet coating of this example 1 are shown in FIG. 2a, which shows that the inter-particle and interlayer interface bonding of the coating is good, the MoB/CoCr cermet coating has high bonding strength, and the optical absorption and high-temperature thermal stability are good.
Example 2
A preparation method of a ternary boride cermet solar selective absorption composite coating comprises the following steps:
s11: according to mMo+BAnd mCo+CrWeighing Mo, Cr and Co with the grain diameter of 15-45 mu m and B with the grain diameter of 1-5 mu m at a ratio of 2:1, wherein the atomic ratio of Mo to B is 1:1, and the mass ratio of Co to Cr is 1: 1; then mechanically mixing according to the ball milling parameters of the rotating speed of 160rpm, the ball milling time of 3 hours and the ball-to-material ratio of 10:1, wherein absolute ethyl alcohol is adopted as a ball milling medium;
s12: and drying the powder which is subjected to ball milling and uniform mixing, adding 8wt% of polyvinyl alcohol as a binder while performing magnetic stirring, putting the powder into a blast drier for drying after the powder and the binder are uniformly stirred, and crushing and screening to obtain the Mo-B-Co-Cr composite powder with the particle size of 15-50 microns.
S13: selecting 316L stainless steel as a spraying substrate, carrying out sand blasting and coarsening treatment on the substrate before spraying, and depositing a MoB/CoCr metal ceramic coating with the thickness of about 200 mu m on the surface of the 316L stainless steel substrate by adopting a supersonic speed flame spraying system, wherein the spraying process parameters are as follows: oxygen is taken as combustion-supporting gas, the flow is 402L/min, and the pressure is 0.6 MPa; propane is used as fuel gas, the flow is 36L/min, and the pressure is 0.4 MPa; nitrogen is used as powder feeding gas, the flow is 45L/min, the pressure is 0.55MPa, and the powder feeding rate is 50 r/min; the spraying distance is 150 mm.
S14: the absorptivity alpha of the coating is 1.08 when the coating is tested by a Lamda750 type UV-Vis-NIR spectrophotometer at a wave band of 0.3-2.5 mu m, and the emissivity of the coating is 0.087 when the coating is tested by a Tensor 27 type BRUKER infrared spectrometer at a wave band of 2.5-25 mu m; a high-temperature thermal stability test experiment is carried out by adopting a cyclic heating air cooling method, a sample is firstly placed in a muffle furnace with certain stability for heating and heat preservation for 10min, then the sample is taken out to the air for cooling to room temperature, and cyclic operation is repeated, the experimental test shows that the heat-shock resistant cycle times of the coating sample at 600 ℃ can reach 201 times, and the heat-shock resistant cycle times at 900 ℃ can reach 81 times.
Example 3
A preparation method of a ternary boride cermet solar selective absorption composite coating comprises the following steps:
s11: according to mMo+BAnd mCo+CrWeighing Mo, Cr and Co with the grain diameter of 15-45 mu m and B with the grain diameter of 1-5 mu m at a ratio of 3:1, wherein the atomic ratio of Mo to B is 1:1, and the mass ratio of Co to Cr is 1: 1; then mechanically mixing according to the ball milling parameters of the rotating speed of 160rpm, the ball milling time of 3 hours and the ball-to-material ratio of 10:1, wherein absolute ethyl alcohol is adopted as a ball milling medium;
s12: and drying the powder which is subjected to ball milling and uniform mixing, adding 10wt% of polyvinyl alcohol as a binder while performing magnetic stirring, putting the powder into a blast drier for drying after the powder and the binder are uniformly stirred, and crushing and screening to obtain the Mo-B-Co-Cr composite powder with the particle size of 15-50 microns.
S13: selecting 316L stainless steel as a spraying substrate, carrying out sand blasting and coarsening treatment on the substrate before spraying, and depositing a MoB/CoCr metal ceramic coating with the thickness of about 100 mu m on the surface of the 316L stainless steel substrate by adopting a supersonic speed flame spraying system, wherein the spraying process parameters are as follows: oxygen is taken as combustion-supporting gas, the flow is 402L/min, and the pressure is 0.6 MPa; propane is used as fuel gas, the flow is 36L/min, and the pressure is 0.4 MPa; nitrogen is used as powder feeding gas, the flow is 45L/min, the pressure is 0.55MPa, and the powder feeding rate is 50 r/min; the spraying distance is 150 mm.
S14: the absorptivity alpha of the coating is 1.12 when the coating is tested by a Lamda750 type UV-Vis-NIR spectrophotometer at a wave band of 0.3-2.5 mu m, and the emissivity of the coating is 0.085 when the coating is tested by a Tensor 27 type BRUKER infrared spectrometer at a wave band of 2.5-25 mu m; a high-temperature thermal stability test experiment is carried out by adopting a cyclic heating air cooling method, a sample is firstly placed in a muffle furnace with certain stability for heating and heat preservation for 10min, then the sample is taken out to the air for cooling to room temperature, and cyclic operation is repeated, the experimental test shows that the heat-shock resistant cycle times of the coating sample at 600 ℃ can reach 209 times, and the heat-shock resistant cycle times at 900 ℃ can reach 87 times.
Example 4
A preparation method of a ternary boride cermet solar selective absorption composite coating comprises the following steps:
s11: according to mMo+BAnd mNi+CrWeighing Mo, Cr and Ni with the grain diameter of 15-45 mu m and B with the grain diameter of 1-5 mu m according to the ratio of 1:1, wherein the atomic ratio of Mo to B is 1:1, and the mass ratio of Ni to Cr is 1: 1; then mechanically mixing according to the ball milling parameters of the rotation speed of 200rpm, the ball milling time of 3 hours and the ball-to-material ratio of 10:1, wherein absolute ethyl alcohol is adopted as a ball milling medium;
s12: drying the powder which is subjected to ball milling and uniform mixing, adding 10wt% of polyvinyl alcohol as a binder while performing magnetic stirring, putting the mixed powder and the binder into a blast drier for drying after uniformly stirring, and crushing and screening to obtain Mo-B-Ni-Cr composite powder with the particle size of 15-50 microns.
S13: selecting 316L stainless steel as a spraying substrate, carrying out sand blasting roughening treatment on the substrate before spraying, and depositing a MoB/NiCr metal ceramic coating with the thickness of about 200 mu m on the surface of the 316L stainless steel substrate by adopting a supersonic speed flame spraying system, wherein the spraying process parameters are as follows: oxygen is taken as combustion-supporting gas, the flow is 322L/min, and the pressure is 0.6 MPa; propane is used as fuel gas, the flow is 42L/min, and the pressure is 0.4 MPa; nitrogen is used as powder feeding gas, the flow is 45L/min, the pressure is 0.55MPa, and the powder feeding rate is 80 r/min; the spraying distance is 150 mm.
S14: the absorptivity alpha of the coating is 1.13 when tested in a 0.3-2.5 mu m wave band by adopting a Lamda750 type UV-Vis-NIR spectrophotometer, and the emissivity of the coating is 0.083 when tested in a 2.5-25 mu m wave band by adopting a Tensor 27 type BRUKER infrared spectrometer; a high-temperature thermal stability test experiment is carried out by adopting a cyclic heating air cooling method, a sample is firstly placed in a muffle furnace with certain stability for heating and heat preservation for 10min, then the sample is taken out to the air for cooling to room temperature, and cyclic operation is repeated, and the experimental test shows that the heat-shock resistant cycle times of the coating sample at 600 ℃ can reach 213 times, and the heat-shock resistant cycle times at 900 ℃ can reach 92 times.
The results of X-ray diffraction analysis of the MoB/NiCr cermet coating of example 4 are shown in FIG. 1b, where it can be seen that the in-situ reaction in the MoB/NiCr cermet coating produced NiMo2B2A ternary boride.
The structure morphology analysis of the MoB/NiCr cermet coating of this example 4 was performed, and the results are shown in fig. 2b, which shows that the inter-particle and inter-layer interfaces in the coating are well bonded, the MoB/NiCr cermet coating has high bonding strength, and good optical absorption and high temperature thermal stability.
Example 5
A preparation method of a ternary boride cermet solar selective absorption composite coating comprises the following steps:
s11: according to mMo+BAnd mNi+CrWeighing Mo, Cr and Ni with the grain diameter of 15-45 mu m and B with the grain diameter of 1-5 mu m at a ratio of 2:1, wherein the atomic ratio of Mo to B is 1:1, and the mass ratio of Ni to Cr is 1: 1; then mechanically mixing according to the ball milling parameters of the rotation speed of 200rpm, the ball milling time of 3 hours and the ball-to-material ratio of 10:1, wherein absolute ethyl alcohol is adopted as a ball milling medium;
s12: and drying the powder which is subjected to ball milling and uniform mixing, adding 8wt% of polyvinyl alcohol as a binder while performing magnetic stirring, putting the powder into a blast drier for drying after the powder and the binder are uniformly stirred, and crushing and screening to obtain the Mo-B-Ni-Cr composite powder with the particle size of 15-50 microns.
S13: selecting 316L stainless steel as a spraying substrate, carrying out sand blasting coarsening treatment on the substrate before spraying, and depositing a MoB/NiCr metal ceramic coating with the thickness of about 160 mu m on the surface of the 316L stainless steel substrate by adopting a supersonic speed flame spraying system, wherein the spraying process parameters are as follows: oxygen is taken as combustion-supporting gas, the flow is 322L/min, and the pressure is 0.6 MPa; propane is used as fuel gas, the flow is 42L/min, and the pressure is 0.4 MPa; nitrogen is used as powder feeding gas, the flow is 45L/min, the pressure is 0.55MPa, and the powder feeding rate is 80 r/min; the spraying distance is 150 mm.
S14: the absorptivity alpha of the coating is 1.14 when tested in a 0.3-2.5 mu m wave band by using a Lamda750 type UV-Vis-NIR spectrophotometer, and the emissivity of the coating is 0.083 when tested in a 2.5-25 mu m wave band by using a Tensor 27 type BRUKER infrared spectrometer; a high-temperature thermal stability test experiment is carried out by adopting a cyclic heating air cooling method, a sample is firstly placed in a muffle furnace with certain stability for heating and heat preservation for 10min, then the sample is taken out to the air for cooling to room temperature, and cyclic operation is repeated, the experimental test shows that the thermal shock resistance cycle times of the coating sample at 600 ℃ can reach 221 times, and the thermal shock resistance cycle times at 900 ℃ can reach 96 times.
Example 6
A preparation method of a ternary boride cermet solar selective absorption composite coating comprises the following steps:
s11: according to mMo+BAnd mNi+CrWeighing Mo, Cr and Ni with the grain diameter of 15-45 mu m and B with the grain diameter of 1-5 mu m according to the ratio of 3:1, wherein the atomic ratio of Mo to B is 1:1, and the mass ratio of Ni to Cr is 1: 1; then mechanically mixing according to the ball milling parameters of the rotation speed of 200rpm, the ball milling time of 3 hours and the ball-to-material ratio of 10:1, wherein absolute ethyl alcohol is adopted as a ball milling medium;
s12: and drying the powder which is subjected to ball milling and uniform mixing, adding 5wt% of polyvinyl alcohol serving as a binder while performing magnetic stirring, putting the powder into a blast drier for drying after the powder and the binder are uniformly stirred, and crushing and screening to obtain the Mo-B-Ni-Cr composite powder with the particle size of 15-50 microns.
S13: selecting 316L stainless steel as a spraying substrate, carrying out sand blasting coarsening treatment on the substrate before spraying, and depositing a MoB/NiCr metal ceramic coating with the thickness of about 100 mu m on the surface of the 316L stainless steel substrate by adopting a supersonic speed flame spraying system, wherein the spraying process parameters are as follows: oxygen is taken as combustion-supporting gas, the flow is 322L/min, and the pressure is 0.6 MPa; propane is used as fuel gas, the flow is 42L/min, and the pressure is 0.4 MPa; nitrogen is used as powder feeding gas, the flow is 45L/min, the pressure is 0.55MPa, and the powder feeding rate is 80 r/min; the spraying distance is 150 mm.
S14: the absorptivity alpha of the coating is 1.16 when the coating is tested in a 0.3-2.5 mu m waveband by adopting a Lamda750 type UV-Vis-NIR spectrophotometer, and the emissivity of the coating is 0.082 when the coating is tested in a 2.5-25 mu m waveband by adopting a Tensor 27 type BRUKER infrared spectrometer; a high-temperature thermal stability test experiment is carried out by adopting a cyclic heating air cooling method, a sample is firstly placed in a muffle furnace with certain stability for heating and heat preservation for 10min, then the sample is taken out to the air for cooling to room temperature, and cyclic operation is repeated, the experimental test shows that the thermal shock resistance cycle times of the coating sample at 600 ℃ can reach 245 times, and the thermal shock resistance cycle times at 900 ℃ can reach 98 times.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A preparation method of a ternary boride cermet solar selective absorption composite coating is characterized by comprising the following steps:
s1: weighing powdery Mo, B, Cr and M according to a proportion, mixing, ball-milling and drying to obtain Mo-B-Cr-M composite powder, wherein M is Co or Ni;
s2: adding a binder into the dried Mo-B-Cr-M composite powder, magnetically stirring until the mixture is uniformly mixed, and then drying, crushing and sieving the mixture;
s3: and (4) spraying the Mo-B-Cr-M composite powder screened in the step S2 on the surface of a base material by adopting a supersonic flame spraying technology to obtain a MoB/CoCr or MoB/NiCr metal ceramic coating.
2. The method for preparing the ternary boride cermet solar selective absorption composite coating according to claim 1, wherein the grain sizes of the powdery Mo, Co, Cr and Ni are 15 μm to 45 μm, and the grain size of the powdery B is 1 μm to 5 μm.
3. The method for preparing the ternary boride cermet solar selective absorption composite coating according to claim 1, wherein the particle size of the sieved Mo-B-Cr-M composite powder is 15 μ M to 50 μ M.
4. The method for preparing the ternary boride cermet solar selective absorption composite coating according to claim 1, characterized in that the binder is polyvinyl alcohol and the addition amount is 5-10 wt%.
5. The method for preparing a ternary boride cermet solar selective absorption composite coating according to claim 1, characterised in that m isMo+BAnd mM+Cr1-3:1, wherein the atomic ratio of Mo to B is 1:1, and the mass ratio of M to Cr is 1: 1.
6. The method for preparing a ternary boride cermet solar selective absorption composite coating according to claim 1, characterised in that the base material is 316L stainless steel.
7. The method of preparing a ternary boride cermet solar selective absorption composite coating of claim 6 further including a grit blasting roughening pretreatment process on the base material.
8. The method for preparing the ternary boride cermet solar selective absorption composite coating according to claim 1, wherein the process parameters of the spray coating by the supersonic flame spraying technology are as follows: oxygen is combustion-supporting gas, the flow rate is 322-402L/min, and the pressure is 0.6 MPa; propane is fuel gas, the flow is 36-42L/min, and the pressure is 0.4 MPa; the nitrogen is used as powder feeding gas, the flow is 45L/min, the pressure is 0.55MPa, and the powder feeding rate is 50-80 r/min; the spraying distance is 150-200 mm.
9. A ternary boride cermet solar selective absorbing composite coating prepared by the method of any one of claims 1 to 8.
10. The ternary boride cermet solar selective absorption composite coating of claim 9 wherein the thickness of the coating is 100-200 μ ι η.
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