CN103290352B - A kind of spraying method prepares the method for Zirconium oxide heat barrier coating - Google Patents
A kind of spraying method prepares the method for Zirconium oxide heat barrier coating Download PDFInfo
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- CN103290352B CN103290352B CN201310240992.0A CN201310240992A CN103290352B CN 103290352 B CN103290352 B CN 103290352B CN 201310240992 A CN201310240992 A CN 201310240992A CN 103290352 B CN103290352 B CN 103290352B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention relates to a kind of method that spraying method prepares Zirconium oxide heat barrier coating, first it adopt the method for environmental protection to prepare large-specific-area stable nano zirconium oxide powder, then, on the basis of prepared large-specific-area stable nano zirconium oxide powder, appropriate Lu is added
2o
3, In
2o
3, Al
2o
3and TiO
2prepare ZrO
2thermal barrier coating, obtained coating stability is good and have higher corrosion resistance.
Description
Technical field
The invention belongs to materials science field, be specifically related to a kind of method that spraying method prepares Zirconium oxide heat barrier coating.
Background technology
Thermal barrier coating (Thermal Barrier Coating) is one deck ceramic coating, it is deposited on the surface of refractory metal or superalloy, thermal barrier coating plays heat-blocking action for base material, reduce base reservoir temperature, the device (as engine turbine blade) made with it at high temperature can be run, and device (engine etc.) thermo-efficiency can be improved reach more than 60%.
U.S. NASA (National Aeronautics and Space Administration)-Lewis research centre, in order to improve gas-turbine blade, the high temperature resistance of rocket engine and corrosion resistance nature, just proposes thermal barrier coating concept as far back as twentieth century the fifties.After the Material selec-tion and preparation technology of coating carry out the exploration of long period, the beginning of the eighties achieves important breakthrough, and solid foundation has been established in the application for thermal barrier coating.Document shows, current advanced thermal barrier coating can reduce high-temperature engine hot-end component about temperature 170K under Working environment.Along with the application of thermal barrier coating on high-temperature engine hot-end component, people recognize that the application of thermal barrier coating not only can reach and improve matrix resistance to high temperature corrosion ability, the object of further raising engine operating temperature, and fuel oil consumption can be reduced, raise the efficiency, extend the work-ing life of hot-end component.Compared with development of new high temperature alloy, the research cost of thermal barrier coating is relatively low, and technique is practicable also.
Along with the development of Aeronautics and Astronautics and civilian technology, the use temperature of hot-end component requires more and more higher, with the extreme condition of reach a high temperature alloy and monocrystal material.For the heating part of gas turbine as nozzle, blade, combustion chamber, they are in the severe environment such as high temperature oxidation and high temperature gas flow erosion, and withstand temp, up to 1100 DEG C, has exceeded the ultimate temperature (1075 DEG C) that high temperature nickel alloy uses.The high strength of metal, high tenacity are combined a little prepared thermal barrier coating can solve the problem with the resistant to elevated temperatures of pottery, it can play heat insulation, anti-oxidant, etch-proof effect, on the hot junction materials such as steam turbine, oil electric engine, jet engine, obtain certain application, and improve the work-ing life of hot-end component.
Zirconium dioxide is the main raw material in current thermal barrier coating, zirconium dioxide (chemical formula: ZrO
2, or claim zirconium white) and be the main oxides of zirconium, be white odorless, tasteless crystal under usual condition, be insoluble in water, hydrochloric acid and dilute sulphuric acid.Generally normal containing a small amount of hafnium oxide.Chemical property torpescence, but high-melting-point, the character of high resistivity, high refractive index and low thermal coefficient of expansion, makes it become important high temperature material, ceramic insulating material and ceramic opalizer.
Pure zirconium dioxide is a kind of senior refractory raw material, and its melt temperature is about 2900 DEG C.It can improve the high temperature viscosity of glaze and expand the temperature range of viscosity B coefficent, has good thermostability, when its content is 2%-3%, can improve the freedom from cracking performance of glaze.Unreactiveness also because of it is large, therefore can improve chemical stability and the acid and alkali-resistance ability of glaze, can also play the effect of opacifying agent. and in architectural pottery glaze, use zircon, general consumption is 8%-12% more.And be the main raw material of " under glaze white ", zirconium white is the good assistant toner of yellow-green pigment, obtains the zirconium white that good vanadium zirconium yellow pigment must select matter pure if want.
The chemical property of zirconium dioxide is very stable, the zirconium dioxide character especially torpescence after calcining.It can by Thickish hot hydrochloric acid, sulfuric acid, hydrofluoric acid and nitric acid corrode, can generate zirconate with oxyhydroxide, oxide compound and carbonate congruent melting under high temperature, be in fact high molecular mixed metal oxide.Zirconium dioxide and carbon and chlorine pyroreaction, or and carbon tetrachloride reaction, generate zirconium tetrachloride and zirconyl chloride, hydrolysis is got back zirconium dioxide.It generates zirconium carbide with carbon effect in electric arc.
The preparation method of zirconium dioxide is more, and the sol-gel method wherein in wet chemistry method is due to the trickle and narrowly distributing of material particle size of preparation; The material purity obtained is high, chemical composition is even; The advantages such as lower than traditional method 400 DEG C-500 DEG C of firing temperature are ideal and have the method preparing zirconium dioxide powder of practical value at present.
From french chemist J.J.Ebelmen SiCl in 1846
4after mixing with ethanol, find to occur be hydrolyzed and define gel in wet air.Colloidal sol in 100 years-gel technique gradual perfection also obtains tremendous development.After 1970, sol-gel technique (Sol-Gel method) is as the emerging manufacturing technology of a kind of high-tech, obtain the great attention of scientific and technological circle and business circles, the composite oxide material being difficult to obtain in glass, ultrafine powder, oxide coating, fiber, function ceramics powder and traditional method is succeeded application.
Sol-gel process is one of wet-chemical reaction method, usually presoma is made with metal alkoxide or inorganic salt, by these raw material Homogeneous phase mixing under liquid phase, and be hydrolyzed, condensation chemical reaction, form stable vitreosol system in the solution, colloidal sol is slowly polymerized through between ageing micelle, forms the gel of three-dimensional space network structure, be filled with the solvent lost flowability between gel network, form gel.Gel prepares the material of molecule and even nanometer substructure through super-dry, sintering curing.
Solvation:
M(H
2O)nz+=M(H
2O)n-1(OH)(z-1)+H
+
Hydrolysis reaction:
M(OR)n+xH
2O=M(OH)x(OR)n-x+xROH------M(OH)n
Polycondensation:
Dehydration polycondensation :-M-OH+HO-M-=-M-O-M-+H
2o
Lose alcohol polycondensation :-M-OR+HO-M-=-M-O-M-+ROH
Inorganic salt or metal alkoxide are made presoma, by these raw material Homogeneous phase mixing under liquid phase, and be hydrolyzed, condensation chemical reaction, or solidifying form colloidal sol by separating, the principal element affecting this process has the temperature of reaction of water, add-on, rate of addition, pH etc.The raising of temperature contributes to the hydrolysis of alkoxide, to the alkoxide (as silicon alkoxide) low to hydrolytic activity, its hydrolysis often need be carried out under heating state, that water speed increases the increase of micelle molecular kinetic energy, probability of collision also increases, rate of polymerization is fast, thus cause aerosol time to shorten, on the other hand, under comparatively high temps, the volatilization of solvent alcohol is also accelerated, be equivalent to add reactant concn, also colloidal sol speed simultaneous temperature is accelerated to a certain extent also unsuitable too high, too high temperature can make the colloidal sol of generation relatively unstable, and easily have the hydrolytic-polymeric reaction of multi-products, generate not volatile organic matter.Therefore, when guaranteeing to generate colloidal sol, lesser temps is taked as far as possible.The add-on of water should add according to stoichiometric ratio.The plastic mass that stoichiometric ratio adds is good, and the time of plastic is relatively short.If amount of water extends aerosol time lower than the consumption required for stoichiometric ratio can make alcoholization hydrolysis reaction slow; If amount of water, higher than in the consumption required for stoichiometric ratio, can make solution become dilution, soltion viscosity declines, and plastic is more difficult.When dripping alkoxide solution, rate of addition should be observed when other are consistent, drop rate is faster, gelation rate is also fast, but rate of addition is too fast, local can be made to be hydrolyzed too fast generation polymerization and gel and generate precipitation, a part of sol solutions is hydrolyzed and finally cannot obtains homogeneous gel simultaneously, so also should uniform stirring be aided with when reacting, thus ensure to obtain the gel be evenly distributed.The pH of reaction solution is different, and its reaction mechanism is different, thus to the hydrolytie polycondensation of same metal alkoxide, often produces structure, polycondensation that form is different.Research shows, when pH is less, polycondensation speed is far longer than hydrolysis reaction, is hydrolyzed by H
+close motor reason cause, polycondensation starts before complete hydrolysis, and therefore polycondensate degree of crosslinking is low; When pH is larger, the hydrolysis reaction system of system is by [OH
-] nucleophilic substitution cause, hydrolysis rate is greater than nucleophilic speed, forms high polymer, has higher degree of crosslinking, can select suitable acid base catalysator by the material requirements that specifically will produce.
Form stable vitreosol system in the solution, colloidal sol is slowly polymerized through between ageing micelle, and form the gel of three-dimensional space network structure, the colloidal sol of tool mobility forms the gelling system that can not flow after polycondensation.Through polycondensation formed sol solution in ageing time, the further agglomeration of polymkeric substance becomes granule submanifold, and they mutually collide and connect into macroparticle bunch, and meanwhile, liquid phase is wrapped in solid skeleton and loses flowing, formed gel.Be filled with the solvent lost flowability between gel network, form gel.Gel prepares the material of molecule and even nanostructure through super-dry, sintering curing and subsequent heat treatment.It is that preparation nano material is comparatively commonly used and novel method that is convenient and easy, that do not need severe condition.
But in prior art, the usual metal alkoxide adopted is as the organic procedures of presoma, although preparing product has the ultra-fine ZrO of bigger serface
2powder, but the method cost is higher, and zirconium alkoxide is expensive, not easily realizes suitability for industrialized production.Prior art also has to be avoided using expensive alkoxide, and the oxalic acid adopting decomposition can not produce obnoxious flavour is precipitation agent, has also prepared ZrO
2nano-powder.The sol-gel method of this modification adds the different tensio-active agent of molecular size range before coagulation, adopt dehydrated alcohol ultrasonic disperse after coagulation, effectively can eliminate agglomeration, however numerous and diverse according to the method preparation process, and amount of surfactant is difficult to control, production cost is higher.Therefore bigger serface stabilized nanoscale ZrO how is prepared
2free from environmental pollutionly again while powder become problem demanding prompt solution.
In addition, people are confirmed by a large amount of tests, and the main medium gas turbine engine scribbling thermal barrier coating being produced to thermal etching effect is NaCl, Na
2sO
4, V
2o
5deng.At different conditions, they are attached to the surface of high-temperature component with gaseous state, liquid state or solid-state form.Wherein NaCl is mainly from the pollution of air or seawater, especially at sea or the aircraft of operation in coastal atmospheric environment.Na
2sO
4and V
2o
5not directly from air.Na
2sO
4combustion oxidation mainly from sulphur in rocket engine fuel and compound thereof reacts.In the technique preparing thermal barrier coating, usually with Y in prior art
2o
3, Ta
2o
5, Nd
2o
3or or La
2o
3as stabilizer element, the thermal etching that the impurity chemical reaction at high temperature such as vanadic salts, sodium salt in mentioned component and oil plant causes also is the common factors causing coating failure.Corrode fused salt under high temperature and penetrate into coating by the hole in plasma spraying coating, normal and Na
2sO
4-V
2o
5fused salt reacts, and causes fused salt to infiltrate along thermal barrier coating, and reacting with tack coat makes thermal barrier coating unsticking lose efficacy.
Summary of the invention
The object of this invention is to provide a kind of method that spraying method prepares Zirconium oxide heat barrier coating, main purpose is on the basis of prepared large-specific-area stable nano zirconium oxide powder, adds appropriate Lu
2o
3, In
2o
3, Al
2o
3and TiO
2prepare ZrO
2thermal barrier coating, obtained coating stability is good and have higher corrosion resistance.
Goal of the invention of the present invention is achieved through the following technical solutions: a kind of spraying method prepares the method for Zirconium oxide heat barrier coating, comprises following steps:
A, nano level ZrO
2the preparation of powder
(1) Zr (OH) of 230 ~ 250 weight parts is taken
4with the YCl of 27 ~ 33 weight parts
3, join in deionized water and be mixed with the acidic solution that concentration is 6%, be heated to 65 DEG C under agitation, dissolve completely and fully mixing;
(2) potassium hydroxide of 660 ~ 690 weight parts is got, join in deionized water and be mixed with 13% basic solution, the acidic solution be mixed with in above-mentioned steps is at the uniform velocity added drop-wise in basic solution, adjust ph is 9.3 ~ 9.5, make two kinds of salt co-precipitation, obtain the yttria-stabilized zirconia with crystal water, precipitation 3h, obtain hydrogel;
(3) add dispersion agent in the hydrogel prepared in above-mentioned steps and filter, with the Zr (OH) after deionized water wash except alkaline agent making beating
4hydrogel AgNO
3inspection, until can't detect Cl
-;
(4) filter cake after filtration is added tertiary amyl alcohol and stir 30min, the volume ratio 1:5 of filter cake and alcohol;
(5) continuing to carry out dynamic component distillation when being warming up to 95 ~ 98 DEG C, obtaining the zirconium hydroxide powder loosened;
(6) continue at 550 ~ 700 DEG C after high-temperature calcination 1.5 ~ 2h, temperature rise rate 5 DEG C/min, obtains the ZrO of nano level bigger serface
2powder;
B, prepare thermal barrier coating
(7) ZrO of the nano level bigger serface of 90 ~ 110 weight parts prepared by above-mentioned steps is chosen
2powder, then the stablizer choosing 12 ~ 15 weight parts, described stablizer is Lu
2o
3, In
2o
3, Al
2o
3and TiO
2mixture, Lu in mixture
2o
3, In
2o
3, Al
2o
3and TiO
2mol ratio be 1:1:1:1;
(8) by ZrO that proportioning in above-mentioned steps is good
2powder and stablizer mixing and ball milling, the speed of ball milling is 270 ~ 290r/min, and the time of described ball milling is 2h;
(9) high temperature and high speed plasma jet is formed by plasma gun, after the mixed powder that powder feeding air propels above-mentioned steps obtains enters plasma jet, mixed powder is rapidly heated to melting or semi-melting state, and accelerated by plasma jet, form the spraying particle bundle flying to base material, particle beam strikes through pretreated substrate surface, finally forms thermal barrier coating.
Further, dispersion agent adopts PEG4000, and add-on is 0.03% of slip weight, and except alkaline agent is oxalic acid, add-on is 0.8% of slip weight.
About technique effect of the present invention.First, be uniformly mixed with in reaction process, zirconium white nucleus just begins to take shape, and just can grow up through Overheating Treatment forms Tetragonal stabilized nanoscale Zirconium powder.Owing to there is not chlorion, sulfonium ion problem normal in liquid phase method in reaction product, thus the cleaning of product is easy, and powder loosens, and reunite few, reactive behavior is high, and specific surface area is long-pending large, Heat stability is good.Then, when preparing thermal barrier coating, owing to have selected Lu
2o
3, In
2o
3, Al
2o
3and TiO
2mixture as stablizer, when spraying particle bundle, host (ZrO in particle beam
2) and stablizer (Lu
2o
3, In
2o
3, Al
2o
3with TiO
2) between spread, formed Lu
2o
3, In
2o
3, Al
2o
3with TiO
2impurity ZrO
2particle beam, particle beam strikes through pretreated substrate surface, finally forms Lu
2o
3, In
2o
3, Al
2o
3with TiO
2polynary stabilizing zirconia (Tetragonal and metastable tetragonal zirconia phase) corrosion and heat resistant coating.Due to Lu
5+, In
3+, Al
3+and Ti
4+ionic radius be less than Na
2sO
4-V
2o
5v in fused salt
5+ionic radius, and Lu
5+with In
3+defect combined action add In
2o
3anti-Na
2sO
4-V
2o
5fused salt corrosion performance, therefore stablizer Lu
2o
3, In
2o
3, Al
2o
3and TiO
2all and Na
2sO
4-V
2o
5fused salt is difficult to chemical reaction occurs.So Multi-component stable thermal-corrosion-rezirconia zirconia coat material of the present invention has excellent stability and anti-fused salt corrosion performance.Above-mentioned preparation method is not reported in the prior art.
To sum up, thermal barrier coating preparation process prepared by the present invention is scientific and reasonable, and reaction process is easy to control, and product safety is reliable, and has excellent stability and anti-fused salt corrosion performance, can realize suitability for industrialized production.
Embodiment
The technique means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with specific embodiment, setting forth the present invention further.
embodiment 1
A, nano level ZrO
2the preparation of powder
(1) Zr (OH) of 230 weight parts is taken
4with the YCl of 33 weight parts
3, join in deionized water and be mixed with the acidic solution that concentration is 6%, be heated to 65 DEG C under agitation, dissolve completely and fully mixing;
(2) potassium hydroxide of 660 weight parts is got, join in deionized water and be mixed with 13% basic solution, the acidic solution be mixed with in above-mentioned steps is at the uniform velocity added drop-wise in basic solution, adjust ph is 9.4, make two kinds of salt co-precipitation, obtain the yttria-stabilized zirconia with crystal water, precipitation 3h, obtain hydrogel;
(3) add dispersion agent in the hydrogel prepared in above-mentioned steps and filter, with the Zr (OH) after deionized water wash except alkaline agent making beating
4hydrogel AgNO
3inspection, until can't detect Cl
-; Dispersion agent adopts PEG4000, and add-on is 0.03% of slip weight, and except alkaline agent is oxalic acid, add-on is 0.8% of slip weight;
(4) filter cake after filtration is added tertiary amyl alcohol and stir 30min, the volume ratio 1:5 of filter cake and alcohol;
(5) continuing to carry out dynamic component distillation when being warming up to 97 DEG C, obtaining the zirconium hydroxide powder loosened;
(6) continue at 550 DEG C after high-temperature calcination 2h, temperature rise rate 5 DEG C/min, obtains the ZrO of nano level bigger serface
2powder;
B, prepare thermal barrier coating
(7) ZrO of the nano level bigger serface of 90 weight parts prepared by above-mentioned steps is chosen
2powder, then the stablizer choosing 15 weight parts, described stablizer is Lu
2o
3, In
2o
3, Al
2o
3and TiO
2mixture, Lu in mixture
2o
3, In
2o
3, Al
2o
3and TiO
2mol ratio be 1:1:1:1;
(8) by ZrO that proportioning in above-mentioned steps is good
2powder and stablizer mixing and ball milling, the speed of ball milling is 270r/min, and the time of described ball milling is 2h;
(9) high temperature and high speed plasma jet is formed by plasma gun, after the mixed powder that powder feeding air propels above-mentioned steps obtains enters plasma jet, mixed powder is rapidly heated to melting or semi-melting state, and accelerated by plasma jet, form the spraying particle bundle flying to base material, particle beam strikes through pretreated substrate surface, finally forms thermal barrier coating.
embodiment 2
A, nano level ZrO
2the preparation of powder
(1) Zr (OH) of 240 weight parts is taken
4with the YCl of 29 weight parts
3, join in deionized water and be mixed with the acidic solution that concentration is 6%, be heated to 65 DEG C under agitation, dissolve completely and fully mixing;
(2) potassium hydroxide of 680 weight parts is got, join in deionized water and be mixed with 13% basic solution, the acidic solution be mixed with in above-mentioned steps is at the uniform velocity added drop-wise in basic solution, adjust ph is 9.3, make two kinds of salt co-precipitation, obtain the yttria-stabilized zirconia with crystal water, precipitation 3h, obtain hydrogel;
(3) add dispersion agent in the hydrogel prepared in above-mentioned steps and filter, with the Zr (OH) after deionized water wash except alkaline agent making beating
4hydrogel AgNO
3inspection, until can't detect Cl
-; Dispersion agent adopts PEG4000, and add-on is 0.03% of slip weight, and except alkaline agent is oxalic acid, add-on is 0.8% of slip weight;
(4) filter cake after filtration is added tertiary amyl alcohol and stir 30min, the volume ratio 1:5 of filter cake and alcohol;
(5) continuing to carry out dynamic component distillation when being warming up to 98 DEG C, obtaining the zirconium hydroxide powder loosened;
(6) continue at 600 DEG C after high-temperature calcination 2h, temperature rise rate 5 DEG C/min, obtains the ZrO of nano level bigger serface
2powder;
B, prepare thermal barrier coating
(7) ZrO of the nano level bigger serface of 100 weight parts prepared by above-mentioned steps is chosen
2powder, then the stablizer choosing 13 weight parts, described stablizer is Lu
2o
3, In
2o
3, Al
2o
3and TiO
2mixture, Lu in mixture
2o
3, In
2o
3, Al
2o
3and TiO
2mol ratio be 1:1:1:1;
(8) by ZrO that proportioning in above-mentioned steps is good
2powder and stablizer mixing and ball milling, the speed of ball milling is 280r/min, and the time of described ball milling is 2h;
(9) high temperature and high speed plasma jet is formed by plasma gun, after the mixed powder that powder feeding air propels above-mentioned steps obtains enters plasma jet, mixed powder is rapidly heated to melting or semi-melting state, and accelerated by plasma jet, form the spraying particle bundle flying to base material, particle beam strikes through pretreated substrate surface, finally forms thermal barrier coating.
embodiment 3
A, nano level ZrO
2the preparation of powder
(1) Zr (OH) of 250 weight parts is taken
4with the YCl of 27 weight parts
3, join in deionized water and be mixed with the acidic solution that concentration is 6%, be heated to 65 DEG C under agitation, dissolve completely and fully mixing;
(2) potassium hydroxide of 690 weight parts is got, join in deionized water and be mixed with 13% basic solution, the acidic solution be mixed with in above-mentioned steps is at the uniform velocity added drop-wise in basic solution, adjust ph is 9.5, make two kinds of salt co-precipitation, obtain the yttria-stabilized zirconia with crystal water, precipitation 3h, obtain hydrogel;
(3) add dispersion agent in the hydrogel prepared in above-mentioned steps and filter, with the Zr (OH) after deionized water wash except alkaline agent making beating
4hydrogel AgNO
3inspection, until can't detect Cl
-; Dispersion agent adopts PEG4000, and add-on is 0.03% of slip weight, and except alkaline agent is oxalic acid, add-on is 0.8% of slip weight;
(4) filter cake after filtration is added tertiary amyl alcohol and stir 30min, the volume ratio 1:5 of filter cake and alcohol;
(5) continuing to carry out dynamic component distillation when being warming up to 95 DEG C, obtaining the zirconium hydroxide powder loosened;
(6) continue at 700 DEG C after high-temperature calcination 1.5h, temperature rise rate 5 DEG C/min, obtains the ZrO of nano level bigger serface
2powder;
B, prepare thermal barrier coating
(7) ZrO of the nano level bigger serface of 90 ~ 110 weight parts prepared by above-mentioned steps is chosen
2powder, then the stablizer choosing 12 ~ 15 weight parts, described stablizer is Lu
2o
3, In
2o
3, Al
2o
3and TiO
2mixture, Lu in mixture
2o
3, In
2o
3, Al
2o
3and TiO
2mol ratio be 1:1:1:1;
(8) by ZrO that proportioning in above-mentioned steps is good
2powder and stablizer mixing and ball milling, the speed of ball milling is 290r/min, and the time of described ball milling is 2h;
(9) high temperature and high speed plasma jet is formed by plasma gun, after the mixed powder that powder feeding air propels above-mentioned steps obtains enters plasma jet, mixed powder is rapidly heated to melting or semi-melting state, and accelerated by plasma jet, form the spraying particle bundle flying to base material, particle beam strikes through pretreated substrate surface, finally forms thermal barrier coating.
Embodiment 1-3 and traditional YSZ heat barrier coat material are carried out contrast experiment, passes through at 900 DEG C, 60mg/cm
2the Na of concentration
2sO
4-V
2o
5carry out corrosion resistance test in fused salt, net result shows the anti-Na of the polynary stabilizing zirconia of the present invention anti-fused salt corrosion heat barrier coat material
2sO
4-V
2o
5the fused salt corrosion life-span improves more than 8 times than traditional thermal barrier material.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention; the technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications; these changes and improvements all fall in the claimed scope of the invention, and application claims protection domain is defined by appending claims and equivalent thereof.
Claims (4)
1. spraying method prepares a method for Zirconium oxide heat barrier coating, comprises following steps:
A, nano level ZrO
2the preparation of powder
(1) Zr (OH) of 230 ~ 250 weight parts is taken
4with the YCl of 27 ~ 33 weight parts
3, join in deionized water and be mixed with the acidic solution that concentration is 6%, be heated to 65 DEG C under agitation, dissolve completely and fully mixing;
(2) potassium hydroxide of 660 ~ 690 weight parts is got, join in deionized water and be mixed with 13% basic solution, the acidic solution be mixed with in above-mentioned steps is at the uniform velocity added drop-wise in basic solution, adjust ph is 9.3 ~ 9.5, make two kinds of salt co-precipitation, obtain the yttria-stabilized zirconia with crystal water, precipitation 3h, obtain hydrogel;
(3) add dispersion agent in the hydrogel prepared in above-mentioned steps and filter, with the Zr (OH) after deionized water wash except alkaline agent making beating
4hydrogel AgNO
3inspection, until can't detect Cl
-;
(4) filter cake after filtration is added tertiary amyl alcohol and stir 30min, the volume ratio 1:5 of filter cake and alcohol;
(5) continuing to carry out dynamic component distillation when being warming up to 95 ~ 98 DEG C, obtaining the zirconium hydroxide powder loosened;
(6) continue at 550 ~ 700 DEG C after high-temperature calcination 1.5 ~ 2h, temperature rise rate 5 DEG C/min, obtains the ZrO of nano level bigger serface
2powder;
B, prepare thermal barrier coating
(7) ZrO of the nano level bigger serface of 90 ~ 110 weight parts prepared by above-mentioned steps is chosen
2powder, then the stablizer choosing 12 ~ 15 weight parts, described stablizer is Lu
2o
3, In
2o
3, Al
2o
3and TiO
2mixture, Lu in mixture
2o
3, In
2o
3, Al
2o
3and TiO
2mol ratio be 1:1:1:1;
(8) by ZrO that proportioning in above-mentioned steps is good
2powder and stablizer mixing and ball milling, the speed of ball milling is 270 ~ 290r/min, and the time of described ball milling is 2h;
(9) high temperature and high speed plasma jet is formed by plasma gun, after the mixed powder that powder feeding air propels above-mentioned steps obtains enters plasma jet, mixed powder is rapidly heated to melting or semi-melting state, and accelerated by plasma jet, form the spraying particle bundle flying to base material, particle beam strikes through pretreated substrate surface, finally forms thermal barrier coating.
2. spraying method according to claim 1 prepares the method for Zirconium oxide heat barrier coating, it is characterized in that, dispersion agent adopts PEG4000, and add-on is 0.03% of slip weight.
3. spraying method according to claim 1 and 2 prepares the method for Zirconium oxide heat barrier coating, it is characterized in that, except alkaline agent is oxalic acid, add-on is 0.8% of slip weight.
4. spraying method according to claim 1 prepares the method for Zirconium oxide heat barrier coating, it is characterized in that, the speed of the ball milling in above-mentioned steps is preferably 280r/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310240992.0A CN103290352B (en) | 2013-06-18 | 2013-06-18 | A kind of spraying method prepares the method for Zirconium oxide heat barrier coating |
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|---|---|---|---|
| CN201310240992.0A CN103290352B (en) | 2013-06-18 | 2013-06-18 | A kind of spraying method prepares the method for Zirconium oxide heat barrier coating |
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| Publication Number | Publication Date |
|---|---|
| CN103290352A CN103290352A (en) | 2013-09-11 |
| CN103290352B true CN103290352B (en) | 2015-09-09 |
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| CN113403567B (en) * | 2021-06-25 | 2022-10-11 | 西安热工研究院有限公司 | Nano yttrium oxide stabilized zirconia thermal barrier coating and preparation method thereof |
| CN116477940B (en) * | 2023-03-17 | 2024-04-12 | 电子科技大学 | Yttrium titanate doped zirconia ceramic material and preparation method and application thereof |
| CN117088686B (en) * | 2023-10-19 | 2024-01-02 | 沈阳恒泰鑫源精铸耐材有限公司 | Modified zirconia coating and preparation method thereof |
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