CN116970895B - Yttrium chromate suspension, low infrared emissivity coating, method of making same and weapon - Google Patents
Yttrium chromate suspension, low infrared emissivity coating, method of making same and weapon Download PDFInfo
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- CN116970895B CN116970895B CN202311227032.0A CN202311227032A CN116970895B CN 116970895 B CN116970895 B CN 116970895B CN 202311227032 A CN202311227032 A CN 202311227032A CN 116970895 B CN116970895 B CN 116970895B
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- 239000000725 suspension Substances 0.000 title claims abstract description 62
- CONVCFJAFLECAQ-UHFFFAOYSA-N [Y+3].[Y+3].[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O Chemical compound [Y+3].[Y+3].[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O CONVCFJAFLECAQ-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 239000011248 coating agent Substances 0.000 title claims abstract description 56
- 238000000576 coating method Methods 0.000 title claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 239000000843 powder Substances 0.000 claims abstract description 47
- 238000005507 spraying Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002270 dispersing agent Substances 0.000 claims abstract description 25
- 238000002360 preparation method Methods 0.000 claims abstract description 25
- 239000000243 solution Substances 0.000 claims abstract description 24
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- 239000007787 solid Substances 0.000 claims abstract description 17
- 239000012266 salt solution Substances 0.000 claims abstract description 16
- 239000007864 aqueous solution Substances 0.000 claims abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 13
- 239000001301 oxygen Substances 0.000 claims abstract description 13
- 239000000446 fuel Substances 0.000 claims abstract description 11
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 238000005488 sandblasting Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000009210 therapy by ultrasound Methods 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 9
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 claims description 7
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 claims description 7
- 235000012538 ammonium bicarbonate Nutrition 0.000 claims description 7
- 239000001099 ammonium carbonate Substances 0.000 claims description 7
- 239000001509 sodium citrate Substances 0.000 claims description 6
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 4
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 4
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 229910052727 yttrium Inorganic materials 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 7
- 230000005855 radiation Effects 0.000 abstract description 3
- 238000007747 plating Methods 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000008367 deionised water Substances 0.000 description 19
- 229910021641 deionized water Inorganic materials 0.000 description 19
- 239000002245 particle Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 10
- 238000003756 stirring Methods 0.000 description 7
- 238000003760 magnetic stirring Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000007750 plasma spraying Methods 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 4
- 238000005524 ceramic coating Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 230000035899 viability Effects 0.000 description 1
Classifications
-
- 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
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
-
- 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
- C23C4/12—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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- F41H3/00—Camouflage, i.e. means or methods for concealment or disguise
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The application provides yttrium chromate suspension, a low infrared emissivity coating, a preparation method thereof and a weapon thereof, and relates to the technical field of metal plating. The yttrium chromate suspension comprises: 10-35% of superfine yttrium chromate powder, 0.1-7% of dispersing agent and the balance of water. The preparation method comprises the following steps: adding the aqueous solution of the precipitant into the mixed salt solution, carrying out solid-liquid separation after the reaction to obtain a solid, and drying and heat-treating to obtain superfine yttrium chromate powder; mixing superfine yttrium chromate powder with water solution of dispersant, and ultrasonic treating to obtain yttrium chromate suspension. The preparation method of the coating with low infrared emissivity comprises the following steps: and (3) carrying out pretreatment and coarsening sand blasting on the substrate, and preparing the low-infrared-emissivity coating on the surface of the substrate by using yttrium chromate suspension and adopting a suspension high-speed oxygen fuel spraying process. The coating provided by the application has strong high temperature resistance, high bonding strength and lower infrared emissivity at a high temperature of 900 ℃, and can effectively inhibit the infrared radiation intensity of the alloy at a high temperature.
Description
Technical Field
The application relates to the field of metal plating, in particular to yttrium chromate suspension, a low infrared emissivity coating, a preparation method thereof and a weapon.
Background
The infrared guided missile uses infrared radiation released by an object as a signal source, can lock, track and destroy the object, and forms a serious threat to the battlefield viability of military weapon equipment. However, with the upgrading and updating of fighter, the temperature of the hot end parts such as the tail nozzle can reach more than 900 ℃, and the conventional metal low-infrared emissivity coating cannot meet the service requirement of a high-temperature environment, so that the ceramic coating has a tendency of preparing the coating with high temperature resistance and low infrared emissivity.
The existing ceramic coating preparation process is high-temperature plasma spraying, but because the flame flow temperature is extremely high, particles in a molten or semi-molten state are deposited on the surface of a substrate and are quickly melted to form a particle staggered stacking state structure, and defects such as cracks and cavities exist among particles, the porosity of the coating is higher, the emissivity of the coating is increased, and therefore, the low-infrared-emissivity coating is difficult to obtain by the high-temperature plasma spraying process.
In view of this, there is a need to develop a new process to obtain a high temperature resistant, low infrared emissivity coating, and further a need to develop materials compatible with this process.
Disclosure of Invention
The application aims to provide yttrium chromate suspension, a low infrared emissivity coating, a preparation method thereof and a weapon for solving the problems.
In order to achieve the above purpose, the application adopts the following technical scheme:
an yttrium chromate suspension comprising: 10-35% of superfine yttrium chromate powder, 0.1-7% of dispersing agent and the balance of water;
the granularity of the superfine yttrium chromate powder is 50-4000 nm, and the dispersing agent comprises one or more of sodium polyacrylate, sodium citrate, sodium ethylenediamine tetraacetate and polyvinyl alcohol.
The application provides a preparation method of yttrium chromate suspension, which comprises the following steps:
adding an aqueous precipitant solution to a solution comprising Y (NO) 3 ) 3 •6H 2 O and Cr (NO) 3 ) 3 •9H 2 In mixed salt solution containing O, carrying out solid-liquid separation after reaction to obtain a solid, and drying and heat-treating the solid to obtain the superfine yttrium chromate powder;
and mixing the superfine yttrium chromate powder with the aqueous solution of the dispersing agent, and carrying out ultrasonic treatment to obtain the yttrium chromate suspension.
Preferably, the preparation method of the yttrium chromate suspension meets one or more of the following conditions:
(1) The precipitant in the aqueous solution of precipitant comprises any one of sodium hydroxide, ammonium bicarbonate or ammonia water;
(2) Y in the mixed salt solution 3+ With Cr 3+ The concentration is 0.05-0.3mol/L independently;
(3) The concentration of the aqueous solution of the precipitant is Y in the mixed salt solution 3+ With Cr 3+ 3-5 times of the total concentration;
(4) The volume ratio of the precipitant aqueous solution to the mixed salt solution is 1:1-1.5:1.
Preferably, the preparation method of the yttrium chromate suspension meets one or more of the following conditions:
(1) The solid-liquid separation further comprises 3-5 times of centrifugal cleaning;
(2) The drying temperature is 90-150 ℃ and the drying time is 3-10h;
(3) The temperature of the heat treatment is 900-1100 ℃ and the time is 2-8h;
(4) The ultrasonic treatment time is 10-30min.
The application provides a low infrared emissivity coating, which comprises the yttrium chromate suspension as a raw material.
The application provides a preparation method of the coating with low infrared emissivity, which comprises the following steps:
and (3) carrying out pretreatment and coarsening sand blasting on the substrate, and preparing the low-infrared-emissivity coating on the surface of the substrate by using the yttrium chromate suspension and adopting a suspension high-speed oxyfuel spraying process.
Preferably, in the suspension high-speed oxygen fuel spraying process, the spraying distance is 150mm-250mm, the oxygen pressure is 0.6-1.3MPa, the hydrogen pressure is 0.3-1.2MPa, the flow rate of the yttrium chromate suspension is 40-120ml/min, and the moving speed of a spray gun is 5-20mm/s.
Preferably, the pretreatment comprises an oil removal treatment.
Preferably, the low infrared emissivity coating has a thickness of 50-150 μm.
The present application provides a weapon, the surface of which is provided, in whole or in part, with said low infrared emissivity coating.
Compared with the prior art, the application has the beneficial effects that:
the yttrium chromate suspension provided by the application comprises superfine yttrium chromate powder, a dispersing agent and water in a proper proportion, wherein the granularity of the superfine yttrium chromate powder is 50-4000 nm; the yttrium chromate has excellent high temperature resistance, and compared with the powder particle size used by the existing high-temperature plasma spraying technology, the particle size of 50-4000 nm is smaller, the stability of the obtained suspension is better, the high-speed oxygen fuel spraying technology can be met, the suspension is well melted, obvious cracks, holes and other defects do not exist among particles in the prepared coating, a compact coating with low porosity is formed, and therefore the high-temperature-resistant coating with low infrared emissivity is obtained. The main purpose of the selection of the dispersing agent and the limitation of the dosage of each component is to ensure the stability of the yttrium chromate suspension, so that the yttrium chromate suspension has good spraying applicability and the uniformity of the prepared coating is realized.
According to the preparation method of the yttrium chromate suspension, a liquid phase coprecipitation method is adopted to obtain a solid, and then drying heat treatment is carried out to obtain superfine yttrium chromate powder; during precipitation, a large amount of crystal nuclei are simultaneously nucleated and grown, so that the granularity is controllable and the preparation efficiency is high.
According to the low-infrared-emissivity coating and the preparation method thereof, yttrium chromate suspension is used as spraying feed, the liquid feeding mode is easier to send the feed to the flame flow center, and the size of powder particles is not limited any more, so that powder with smaller diameter can be selected as a spraying material, the smaller powder can be better melted by a high-speed oxygen fuel spraying technology, and the ceramic coating with extremely low porosity can be prepared due to higher flame flow speed of high-speed oxygen fuel spraying and smaller particle diameter of the powder, and the preparation of the excellent high-temperature-resistant low-infrared-emissivity coating can be realized, and the infrared radiation inhibition and infrared stealth performance of an object in a high-temperature environment can be realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope of the present application.
FIG. 1 shows the superfine YCrO obtained in example 1 3 A morphology graph of the powder;
FIG. 2 is YCrO of example 1 3 Cross-sectional topography of the ceramic coating.
Detailed Description
The term as used herein:
"prepared from … …" is synonymous with "comprising". The terms "comprising," "including," "having," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, step, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, step, method, article, or apparatus.
The conjunction "consisting of … …" excludes any unspecified element, step or component. If used in a claim, such phrase will cause the claim to be closed, such that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of … …" appears in a clause of the claim body, rather than immediately following the subject, it is limited to only the elements described in that clause; other elements are not excluded from the stated claims as a whole.
When an equivalent, concentration, or other value or parameter is expressed as a range, preferred range, or a range bounded by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when ranges of "1 to 5" are disclosed, the described ranges should be construed to include ranges of "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a numerical range is described herein, unless otherwise indicated, the range is intended to include its endpoints and all integers and fractions within the range.
In these examples, the parts and percentages are by mass unless otherwise indicated.
"parts by mass" means a basic unit of measurement showing the mass ratio of a plurality of components, and 1 part may be any unit mass, for example, 1g may be expressed, 2.689g may be expressed, and the like. If we say that the mass part of the a component is a part and the mass part of the B component is B part, the ratio a of the mass of the a component to the mass of the B component is represented as: b. alternatively, the mass of the A component is aK, and the mass of the B component is bK (K is an arbitrary number and represents a multiple factor). It is not misunderstood that the sum of the parts by mass of all the components is not limited to 100 parts, unlike the parts by mass.
"and/or" is used to indicate that one or both of the illustrated cases may occur, e.g., a and/or B include (a and B) and (a or B).
An yttrium chromate suspension comprising: 10-35% of superfine yttrium chromate powder, 0.1-7% of dispersing agent and the balance of water;
the granularity of the superfine yttrium chromate powder is 50-4000 nm, and the dispersing agent comprises one or more of sodium polyacrylate, sodium citrate, sodium ethylenediamine tetraacetate and polyvinyl alcohol.
When the particles are too large, the preparation of a stable suspension is not favored, and the particles are not easily melted during spraying, resulting in a high porosity of the coating and thus a higher infrared emissivity.
Alternatively, the superfine yttrium chromate powder may be used in an amount of any one of 10%, 15%, 20%, 25%, 30%, 35% or 10-35% in the yttrium chromate suspension; the dispersant may be used in an amount of any of 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7% or between 0.1 and 7%; the balance being water.
The application provides a preparation method of yttrium chromate suspension, which comprises the following steps:
adding an aqueous precipitant solution to a solution comprising Y (NO) 3 ) 3 •6H 2 O and Cr (NO) 3 ) 3 •9H 2 In mixed salt solution containing O, carrying out solid-liquid separation after reaction to obtain a solid, and drying and heat-treating the solid to obtain the superfine yttrium chromate powder;
and mixing the superfine yttrium chromate powder with the aqueous solution of the dispersing agent, and carrying out ultrasonic treatment to obtain the yttrium chromate suspension.
In an alternative embodiment, the yttrium chromate suspension is prepared by a process that satisfies one or more of the following conditions:
(1) The precipitant in the aqueous solution of precipitant comprises any one of sodium hydroxide, ammonium bicarbonate or ammonia water;
(2) Y in the mixed salt solution 3+ With Cr 3+ The concentration is 0.05-0.3mol/L independently;
by preparing high-concentration solution, a large amount of crystal nuclei are simultaneously nucleated and grown during precipitation, and finally ultrafine powder with controllable granularity is generated.
Optionally, Y in the mixed salt solution 3+ With Cr 3+ The concentration may be, independently of one another, 0.05mol/L, 0.06mol/L, 0.07mol/L, 0.08mol/L, 0.09mol/L, 0.1mol/L, 0.15mol/L, 0.2mol/L, 0.25mol/L, 0.3mol/L or any value between 0.05 and 0.3 mol/L.
(3) The concentration of the aqueous solution of the precipitant is Y in the mixed salt solution 3+ With Cr 3+ 3-5 times of the total concentration;
optionally, the concentration of the aqueous precipitant solution is Y in the mixed salt solution 3+ With Cr 3+ Any value between 3-fold, 4-fold, 5-fold, or 3-5-fold of the total concentration;
(4) The volume ratio of the precipitant aqueous solution to the mixed salt solution is 1:1-1.5:1.
Alternatively, the volume ratio of the aqueous precipitant solution to the mixed salt solution may be 1: 1. 1.1: 1. 1.2: 1. 1.3: 1. 1.4: 1. 1.5:1 or any value between 1:1 and 1.5:1.
In an alternative embodiment, the yttrium chromate suspension is prepared by a process that satisfies one or more of the following conditions:
(1) The solid-liquid separation further comprises 3-5 times of centrifugal cleaning;
(2) The drying temperature is 90-150 ℃ and the drying time is 3-10h;
(3) The temperature of the heat treatment is 900-1100 ℃ and the time is 2-8h;
(4) The ultrasonic treatment time is 10-30min.
Alternatively, the centrifugal washing may be 3 times, 4 times or 5 times; the drying temperature can be any value between 90 ℃, 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃ or 90-150 ℃ and the drying time can be any value between 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours or 3-10 hours; the temperature of the heat treatment can be 900 ℃, 1000 ℃, 1100 ℃ or any value between 900 and 1100 ℃ and the time can be any value between 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours or 2 to 8 hours; the time of the ultrasonic treatment may be 10min, 20min, 30min or any value between 10 and 30min.
The application provides a low infrared emissivity coating, which comprises the yttrium chromate suspension as a raw material.
The application provides a preparation method of the coating with low infrared emissivity, which comprises the following steps:
and (3) carrying out pretreatment and coarsening sand blasting on the substrate, and preparing the low-infrared-emissivity coating on the surface of the substrate by using the yttrium chromate suspension and adopting a suspension high-speed oxyfuel spraying process.
In the prior art, when small powder particles are adopted, the powder is difficult to be sent to the center of a plasma flame flow; the adoption of large powder particle size leads to high porosity and high emissivity of the coating. Therefore, it is necessary to use a powder having a smaller particle size, and to change the spraying process. The powder can be more easily conveyed to the center of flame flow by using the suspension without being limited by the particle size of the powder.
In an alternative embodiment, the suspension is sprayed by a high-speed oxygen fuel spraying process, the spraying distance is 150mm-250mm, the oxygen pressure is 0.6-1.3MPa, the hydrogen pressure is 0.3-1.2MPa, the flow rate of the yttrium chromate suspension is 40-120ml/min, and the moving speed of a spray gun is 5-20mm/s.
Alternatively, in the suspension high-speed oxy-fuel spraying process, the spraying distance may be 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, or any value between 150mm and 250mm, the oxygen pressure may be 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa, 1.0MPa, 1.1MPa, 1.2MPa, 1.3MPa, or any value between 0.6 and 1.3MPa, the hydrogen pressure may be any value between 0.3MPa, 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa, 0.9MPa, 1.0MPa, 1.1MPa, 1.2MPa, or 0.3-1.2MPa, the flow rate of the yttrium chromate suspension may be any value between 40ml/min, 50ml/min, 60ml/min, 70ml/min, 80ml/min, 90ml/min, 100ml/min, 110ml/min, 120ml/min, or 40-120ml/min, and the spray gun moving speed may be any value between 5mm/s, 10mm/s, 15mm/s, 20mm/s, or 5-20mm/s.
In an alternative embodiment, the pretreatment includes a degreasing treatment.
In an alternative embodiment, the low infrared emissivity coating has a thickness of 50 to 150 μm.
The present application provides a weapon, the surface of which is provided, in whole or in part, with said low infrared emissivity coating.
Embodiments of the present application will be described in detail below with reference to specific examples, but it will be understood by those skilled in the art that the following examples are only for illustrating the present application and should not be construed as limiting the scope of the present application. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
The present example provides a yttrium chromate suspension prepared as follows:
(1) Superfine YCrO 3 Preparing ceramic powder:
(1) will Y (NO) 3 ) 3 •6H 2 O and Cr (NO) 3 ) 3 •9H 2 O is added into deionized water, Y 3+ With Cr 3+ The concentration is 0.2mol/L, and the mixture is completely dissolved by using magnetic stirring;
(2) adding ammonium bicarbonate into deionized water with the concentration of 1.2 mol/L, and using magnetic stirring to completely dissolve the ammonium bicarbonate;
(3) adding the solution obtained in the step (2) into the solution obtained in the step (1) in a volume ratio of 1.2:1, and stirring for 2 hours by using magnetic force to enable the solution to be completely precipitated.
(4) The precipitate was separated by passing the solution obtained in (3) through a centrifuge and subjected to centrifugal washing with deionized water 3 times.
(5) Treating the solid obtained in the step (4) in a vacuum drying oven at 120 ℃ for 6 hours, then treating the solid in a high-temperature furnace at 900 ℃ for 2 hours, and cooling the solid along with the furnace to obtain the superfine YCrO 3 And (3) powder. The obtained superfine YCrO 3 The microscopic morphology of the powder is shown in fig. 1.
（2）YCrO 3 Preparation of a suspension:
(1) adding sodium polyacrylate serving as a dispersing agent into deionized water with the mass fraction of 1%, and stirring for 10min by using magnetic force;
(2) the superfine YCrO obtained in the step (1) is treated 3 Adding the powder into deionized water containing a dispersing agent, wherein the mass fraction is 20%, and carrying out ultrasonic treatment for 25min to obtain YCrO which is uniformly dispersed 3 A suspension.
The embodiment also provides a low infrared emissivity coating, and the preparation method thereof is as follows:
(1) carrying out oil removal treatment on the metal matrix;
(2) coarsening and sand blasting the degreased metal matrix;
(3) YCrO prepared by suspension high-speed oxyfuel spraying process 3 The coating and spraying process parameters are as follows: the spraying distance is 180mm, the oxygen pressure is 1.2MPa, the hydrogen pressure is 0.4MPa, the flow rate of the suspension is 60ml/min, and the moving speed of the spray gun is 10mm/s.
YCrO prepared in example 1 3 The thickness of the coating is 115 mu m, the bonding strength is 16.8MPa, and the infrared emissivity of the 3-5 mu m wave band at 900 ℃ is 0.49. The cross-sectional morphology of the resulting coating is shown in figure 2.
Example 2
The present example provides a yttrium chromate suspension prepared as follows:
(1) Superfine YCrO 3 Preparing ceramic powder:
(1) will Y (NO) 3 ) 3 •6H 2 O and Cr (NO) 3 ) 3 •9H 2 O is added into deionized water, Y 3+ With Cr 3+ The concentration is 0.1mol/L, and the mixture is completely dissolved by using magnetic stirring;
(2) adding sodium hydroxide into deionized water with the concentration of 0.6mol/L, and completely dissolving by using magnetic stirring;
(3) adding the solution obtained in the step (2) into the solution obtained in the step (1) in a volume ratio of 1.1:1, and stirring for 2 hours by using magnetic force to enable the solution to be completely precipitated.
(4) The precipitate was separated by passing the solution obtained in (3) through a centrifuge and subjected to centrifugal washing with deionized water 3 times.
(5) Treating the solid obtained in the step (4) in a vacuum drying oven at 110 ℃ for 5 hours, then treating the solid in a high-temperature furnace at 900 ℃ for 4 hours, and cooling the solid along with the furnace to obtain the superfine YCrO 3 And (3) powder.
（2）YCrO 3 Preparation of a suspension:
(1) adding sodium citrate serving as a dispersing agent into deionized water with the mass fraction of 1.2%, and stirring for 10min by using magnetic force;
(2) the superfine YCrO obtained in the step (1) is treated 3 Adding the powder into deionized water containing a dispersing agent, wherein the mass fraction is 25%, and carrying out ultrasonic treatment for 30min to obtain YCrO which is uniformly dispersed 3 A suspension.
Example 3
The present example provides a yttrium chromate suspension prepared as follows:
(1) Superfine YCrO 3 Preparing ceramic powder:
(1) will Y (NO) 3 ) 3 •6H 2 O and Cr (NO) 3 ) 3 •9H 2 O is added into deionized water, Y 3+ With Cr 3+ The concentration is 0.25mol/L, and the mixture is completely dissolved by using magnetic stirring;
(2) adding ammonium bicarbonate into deionized water with the concentration of 1.5mol/L, and using magnetic stirring to completely dissolve the ammonium bicarbonate;
(3) adding the solution obtained in the step (2) into the solution obtained in the step (1) in a volume ratio of 1.2:1, and stirring for 2 hours by using magnetic force to enable the solution to be completely precipitated.
(4) The precipitate was separated by passing the solution obtained in (3) through a centrifuge and subjected to centrifugal washing 5 times with deionized water.
(5) Treating the solid obtained in the step (4) for 8 hours in a vacuum drying oven at 130 ℃, then treating the solid in a high-temperature furnace at 1000 ℃ for 6 hours, and cooling the solid along with the furnace to obtain the superfine YCrO 3 And (3) powder.
（2）YCrO 3 Preparation of a suspension:
(1) polyvinyl alcohol is used as a dispersing agent, added into deionized water, the mass fraction of the polyvinyl alcohol is 3%, and magnetically stirred for 10min;
(2) the superfine YCrO obtained in the step (1) is treated 3 Adding the powder into deionized water containing a dispersing agent, wherein the mass fraction is 35%, and carrying out ultrasonic treatment for 30min to obtain YCrO which is uniformly dispersed 3 A suspension.
Comparative example 1
YCrO 3 Preparation of a suspension:
(1) adding sodium citrate serving as a dispersing agent into deionized water with the mass fraction of 1.2%, and stirring for 10min by using magnetic force;
(2) YCrO with granularity of 10 μm 3 Adding the powder into deionized water containing a dispersing agent, wherein the mass fraction is 25%, and carrying out ultrasonic treatment for 30min.
In this comparative example, YCrO 3 The particle size of the powder is not within the scope of the application, and the prepared suspension is YCrO in the standing process 3 The powder may precipitate and spray coating may not be achieved.
Comparative example 2
YCrO 3 Preparation of a suspension:
(1) adding sodium citrate serving as a dispersing agent into deionized water with the mass fraction of 0.01%, and stirring for 10min by using magnetic force;
(2) superfine YCrO prepared in example 1 3 Adding the powder into deionized water containing dispersing agent, wherein the mass fraction is 25%And performing ultrasonic treatment for 30min.
In this comparative example, the dispersant ratio was outside the range of the present application, and the prepared suspension was YCrO during standing 3 The powder may precipitate and spray coating may not be achieved.
Comparative example 3
YCrO preparation by plasma spraying process 3 And (3) coating:
(1) carrying out oil removal treatment on the metal matrix;
(2) coarsening and sand blasting the degreased metal matrix;
(3) YCrO is prepared by adopting a plasma spraying process 3 The coating and spraying process parameters are as follows: the spraying distance is 100mm, ar gas flow is 38L/min, H 2 The air flow is 13L/min, the spraying power is 45KW, and the moving speed of the spray gun is 10mm/s.
In this comparative example, YCrO was prepared by a plasma spray process 3 The porosity of the prepared coating is high, the infrared emissivity of the 3-5 mu m wave band at 900 ℃ is more than 0.8, and infrared stealth cannot be realized.
Comparative example 4
In this comparative example, YCrO was prepared by a high-velocity oxy-fuel spray process 3 The difference between the coating and the coating in example 1 is that the spraying distance is 100mm, and the coating is not in the scope of the application, and the coating begins to fall off when the thickness of the coating is less than 50 mu m in the spraying process.
Comparative example 5
In this comparative example, YCrO was prepared by a high-velocity oxy-fuel spray process 3 The difference between the coating and the coating in example 1 is that the spraying times are reduced, so that the thickness of the prepared coating is 20 mu m, the infrared emissivity of the 3-5 mu m wave band of the coating at 900 ℃ is more than 0.8, and the infrared stealth cannot be realized.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims below, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (5)
1. A method for preparing a low infrared emissivity coating, comprising:
pretreating and coarsening the substrate for sand blasting, and preparing the low-infrared-emissivity coating on the surface of the substrate by adopting a high-speed oxygen fuel spraying process by using yttrium chromate suspension; the yttrium chromate suspension comprises: 10-35% of superfine yttrium chromate powder, 0.1-7% of dispersing agent and the balance of water;
the granularity of the superfine yttrium chromate powder is 50-4000 nm, and the dispersing agent comprises one or more of sodium polyacrylate, sodium citrate, sodium ethylenediamine tetraacetate and polyvinyl alcohol;
the preparation method of the yttrium chromate suspension comprises the following steps:
adding an aqueous precipitant solution to a solution comprising Y (NO) 3 ) 3 •6H 2 O and Cr (NO) 3 ) 3 •9H 2 In mixed salt solution containing O, carrying out solid-liquid separation after reaction to obtain a solid, and drying and heat-treating the solid to obtain the superfine yttrium chromate powder;
mixing the superfine yttrium chromate powder with the aqueous solution of the dispersing agent, and carrying out ultrasonic treatment to obtain yttrium chromate suspension;
the pretreatment comprises oil removal treatment; in the suspension high-speed oxygen fuel spraying process, the spraying distance is 150-250 mm, the oxygen pressure is 0.6-1.3MPa, the hydrogen pressure is 0.3-1.2MPa, the flow of the yttrium chromate suspension is 40-120ml/min, and the moving speed of a spray gun is 5-20mm/s;
the low infrared emissivity coating has a thickness of 50-150 μm.
2. The method of preparing a low infrared emissivity coating of claim 1, wherein one or more of the following conditions are met:
(1) The precipitant in the aqueous solution of precipitant comprises any one of sodium hydroxide, ammonium bicarbonate or ammonia water;
(2) Y in the mixed salt solution 3+ With Cr 3+ The concentration is 0.05-0.3mol/L independently;
(3) The concentration of the aqueous solution of the precipitant is Y in the mixed salt solution 3+ With Cr 3+ 3-5 times of the total concentration;
(4) The volume ratio of the precipitant aqueous solution to the mixed salt solution is 1:1-1.5:1.
3. The method of producing a low infrared emissivity coating according to claim 1 or 2, characterized in that one or more of the following conditions are satisfied:
(1) The solid-liquid separation further comprises 3-5 times of centrifugal cleaning;
(2) The drying temperature is 90-150 ℃ and the drying time is 3-10h;
(3) The temperature of the heat treatment is 900-1100 ℃ and the time is 2-8h;
(4) The ultrasonic treatment time is 10-30min.
4. A low infrared emissivity coating, characterized in that it is produced using the method for producing a low infrared emissivity coating according to any one of claims 1 to 3.
5. A weapon, characterized in that the surface of the weapon is provided, in whole or in part, with the low infrared emissivity coating of claim 4.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101438439A (en) * | 2006-04-26 | 2009-05-20 | 丹麦技术大学 | A multi-layer coating |
| CN102758164A (en) * | 2011-04-25 | 2012-10-31 | 中国农业机械化科学研究院 | Temperature-resistant thermal-spray radar absorbing coating and preparation method of spraying powder thereof |
| CN106395905A (en) * | 2016-09-12 | 2017-02-15 | 渤海大学 | Preparation method of yttrium chromate spherical hierarchical structure |
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| DE102019129924A1 (en) * | 2019-08-21 | 2021-02-25 | Endress+Hauser Conducta Gmbh+Co. Kg | Optochemical sensor, sensor cap, use of the optochemical sensor and method for producing an analyte-sensitive layer of the optochemical sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101438439A (en) * | 2006-04-26 | 2009-05-20 | 丹麦技术大学 | A multi-layer coating |
| CN102758164A (en) * | 2011-04-25 | 2012-10-31 | 中国农业机械化科学研究院 | Temperature-resistant thermal-spray radar absorbing coating and preparation method of spraying powder thereof |
| CN106395905A (en) * | 2016-09-12 | 2017-02-15 | 渤海大学 | Preparation method of yttrium chromate spherical hierarchical structure |
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| Title |
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| 高温红外低发射率涂层研究现状;黄文质;刘海韬;;材料导报(S1);全文 * |
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