CN109912308A - A kind of anti-corrosion anti-coking high-temperature nano ceramic coating and its spraying process - Google Patents
A kind of anti-corrosion anti-coking high-temperature nano ceramic coating and its spraying process Download PDFInfo
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Abstract
The present invention relates to a kind of anti-corrosion anti-coking high-temperature nano ceramic coating and its spraying process, nano ceramic coat is prepared by ceramic coating by spraying process, and it includes: 90-100 parts of water, 10-15 parts of nano aluminium oxide, 30-40 parts of nano-graphene, 15-25 parts of nm-class boron nitride, 10-15 parts of aluminium dihydrogen phosphate, 1-2 parts of nano magnesia, 0.5-1 parts of nano zine oxide that ceramic coating, which installs parts by weight,.Aluminium dihydrogen phosphate is soluble easily in water to be dispersed in water nano aluminium oxide, nano-graphene and boron nitride, nano magnesia and nano zine oxide, form ceramic coating, ceramic coating is sprayed on matrix surface film-forming, then is sintered as nano ceramic coat.Nano ceramic coat prepared by the present invention has high-termal conductivity and super-hydrophobicity, is conducive to increase heat-transfer effect and reduces energy consumption, and reduce flue gas the tube skin coking a possibility that, increases safety and service life that boiler tube uses.
Description
Technical field
The present invention relates to inorganic high-temp protective coating technique field more particularly to a kind of anti-corrosion anti-coking high-temperature nano ceramics
Coating and its spraying process.
Background technique
Currently, electric energy is one of not retrievable energy of human survival and development.Thermal power plant be still now mainly for
Electric mode, the big capital equipment of the three of thermal power plant have boiler, steam turbine and generator.Wherein, boiler is to utilize fuel (coal, stone
Oil, combustion gas, biomass, waste etc.) the energy heats water supply discharged of burning, to obtain regulation parameter (temperature, pressure) and product
The steaming plant of matter is the package for carrying out fuel combustion, heat transfer and water vapor process.Boiler is divided into fume tube type and water
Tubular type.Wherein, watertube boiler is that water flows in boiler tube, flue gas flowing heat transfer outside water pipe, relatively securely and reliably, easily
Amplify and high pressure resistant, therefore is widely used.
Watertube boiler is in use, and furnace tube outer wall is easy the coking by contamination.Boiler tube is easily led to after furnace tube outer wall coking
Heat exchange efficiency reduces, and leads to the even easy generation booster of boiler tube uneven heating.When furnace tube outer wall coking is serious, need manually to carry out clear
Reason not only reduces efficiency but also extremely dangerous, is turned in cleaning and sandblasting, can wear to furnace tube outer wall, easy
It reduces the service life of boiler tube but improves the probability of boiler tube booster.
Summary of the invention
The purpose of the present invention one is to provide a kind of anti-corrosion anti-coking high-temperature nano ceramic coating, is covered on tube skin reduction
The probability of tube skin coking.
Above-mentioned purpose one of the invention has the technical scheme that a kind of anti-corrosion anti-coking high-temperature nano
Ceramic coating is sprayed by ceramic coating, and the ceramic coating includes following component according to parts by weight:
90-100 parts of water
10-15 parts of nano aluminium oxide
30-40 parts of nano-graphene
15-25 parts of nm-class boron nitride
10-15 parts of aluminium dihydrogen phosphate
1-2 parts of nano magnesia
0.5-1 parts of nano zine oxide.
By using above-mentioned technical proposal, aluminium dihydrogen phosphate is soluble easily in water to form the liquid with viscosity, can be by nanometer
Aluminium oxide, nano-graphene and boron nitride, nano magnesia and nano zine oxide are dispersed in water, and are formed nano ceramics and are applied
Material.Ceramic coating is sprayed on matrix surface film-forming, then is sintered, during the sintering process aluminium dihydrogen phosphate conduct
Cured coating is fixed on base by inorganic bond, aluminium dihydrogen phosphate and curing agent (nano magnesia and nano zine oxide) effect
Body surface face forms nano ceramic coat after sintering.Nano ceramic coat has high temperature resistant, corrosion-resistant and wear-resistant etc. excellent
Point, and graphene imparts nano ceramic coat high-termal conductivity, is conducive to increase heat transfer in tube skin covering nano ceramic coat
Effect reduces energy consumption；Boron nitride has high-lubricity and thermal conductivity, is conducive to the hydrophobicity for increasing ceramic coating surface, reduces cigarette
Gas increases safety and service life that boiler tube uses the tube skin coking a possibility that.
The present invention is further arranged to: the average grain diameter of the nano-graphene is 20-40nm.
By using above-mentioned technical proposal, nano-graphene selects receiving for suitable dimension since its own property is easy to reunite
Rice graphene reduces agglomeration while guaranteeing that its surface area is larger.
The present invention is further arranged to: the average grain diameter of the nm-class boron nitride is 10-20nm.
By using above-mentioned technical proposal, nm-class boron nitride has high-termal conductivity, wearability and lubricity, and partial size is relatively
It is small, there is synergistic effect to nano-graphene, increase the surface smoothness of nano ceramic coat after being uniformly dispersed, increases nano ceramics
The hydrophobicity of coating, a possibility that advantageously reducing the tube coking after being covered with nano ceramic coat.
The present invention is further arranged to: the average grain diameter of the nano aluminium oxide is 20-30nm.
By using above-mentioned technical proposal, nano aluminium oxide is dispersed in nano ceramic coat as high temperature resistant filler, choosing
It selects suitable size and support and humidification is risen to nano ceramic coat, conducive to the service life for increasing nano ceramic coat.
The present invention is further arranged to: the average grain diameter of the nano magnesia is 20-30nm, the nano aluminium oxide
Average grain diameter is 20-30nm.
By using above-mentioned technical proposal, as fixative, acted on aluminium dihydrogen phosphate by nano ceramics under hot conditions
Coated adhesive is simultaneously fixed on the surface of matrix, and suitable uniform particle sizes is selected to be dispersed in ceramic coating, is conducive to increase
The uniformity and surface smoothness of plus nano ceramic coating.
The present invention is further arranged to: the preparation method of the ceramic coating includes the following steps:
A1, aluminium dihydrogen phosphate is added in 45-50 parts of water and is dissolved, sealing obtains solution A in 12 hours；
A2, nano-graphene, nm-class boron nitride and nano aluminium oxide are added in 45-50 parts of water, are uniformly mixed and obtain solution
B；
A3, solution B are stirred under the mixing speed of 1000-1200r/min, and solution A is added with the speed of 10Kg/min
In solution B, it is uniformly mixed and obtains solution C；
A4, nano magnesia and nano aluminium oxide are added to solution C, are uniformly mixed.
By using above-mentioned technical proposal, it is uniformly mixed each component, increases the uniformity and stabilization of ceramic coating
Property, is conducive to be sprayed on matrix surface and forms uniform nano ceramic coat.
The purpose of the present invention two is to provide a kind of spraying process for preparing anti-corrosion anti-coking high-temperature nano ceramic coating, will receive
Rice ceramic coating is sprayed on tube skin and forms firm nano ceramic coat in tube skin.
Above-mentioned purpose two of the invention, which has the technical scheme that, a kind of prepares anti-corrosion anti-coking high temperature
The spraying process of nano ceramic coat, includes the following steps:
B1, matrix surface cleaning: blasting treatment is carried out to matrix surface, matrix surface is made to reach Sa2.5-3.0 grades of requirements；
B2, matrix surface are washed and dried with water；
B3, normal temperature air spraying: 0.8-1.0MPa compressed air spraying, spraying divide 3-4 spraying, are spaced 6h between spraying, entirely
Room temperature 24 hours solidifications, 80 DEG C of constant temperature 6h after portion sprays；
B4, sinter molding: 380-400 DEG C of sintering 5-6h forms to obtain nano ceramic coat.
By using above-mentioned technical proposal, matrix surface is cleared up, reduces the impurity of matrix surface to nano ceramics
The influence of coating.Matrix surface is cleaned with aqueous solution, is left when reducing sandblasting polishing matrix surface in matrix surface
Attachment of the impurity effect nano ceramic coat to matrix.Spraying is relatively easy to control the thickness of nano ceramic coat by several times.Nano ceramics
Coating is strong to matrix surface adhesive force and any surface finish is even if outer surface of furnace tube has coking appearance can be rinsed with water, be increased
Add the convenience of cleaning coking, while the damage to boiler tube can also be reduced, increases the service life of boiler tube.
The present invention is further arranged to: the nano ceramic coat with a thickness of 0.2mm-0.25mm.
By using above-mentioned technical proposal, the thickness of nano ceramic coat is too small to be easy to cause nano ceramic coat uneven
It is even, it is unfavorable for the smoothness on surface；And blocked up be easy to cause between coating and matrix of nano ceramic coat deforms asynchronous and causes
Nano ceramic coat peels off, and is unfavorable for the stability of the long-time service of nano ceramic coat.
The present invention is further arranged to: the phosphoric acid hydrogen two aluminium of 1-3wt% is added in the water in the step B2.
By using above-mentioned technical proposal, add suitable aluminium dihydrogen phosphate in water, clean matrix surface when, portion
Point be filled into matrix it is processed after surface in, convenient in sinter molding by nano ceramic coat stable adhesion in matrix table
Face increases the stability of nano ceramic coat.
In conclusion advantageous effects of the invention are as follows:
1, ceramic coating is sprayed in boiler tube matrix surface, forms nano ceramic coat after sinter molding, nano ceramics applies
Layer has high temperature resistant, corrosion-resistant and high-termal conductivity, is conducive to protect boiler tube, and the surface of nano ceramic coat has height
Finish and super-hydrophobicity have nano ceramic coat non-stick, reduce a possibility that tube coking occurs, and increasing boiler tube makes
Safety and service life；
2, before spraying to matrix, matrix carries out removing surface and filling bonding agent, is conducive to the nanometer for increasing sinter molding
The adhesive strength of ceramic coating and matrix surface reduces a possibility that nano ceramic coat peels off, and is conducive to increase nano ceramics
Protective capability of the coating to boiler tube；
3, ceramic coating is uniformly mixed, conducive to the smoothness for the uniformity and surface for increasing nano ceramic coat.
Specific embodiment
Embodiment 1
A kind of anti-corrosion anti-coking high-temperature nano ceramic coating and its spraying process, include the following steps:
(1) preparation of ceramic coating:
A1, according to parts by weight, 14 parts of aluminium dihydrogen phosphates are added in 50 parts of water and dissolves and stirs evenly, and are sealed 12 hours
Obtain solution A；
A2, by 35 parts of partial sizes be 20-40nm nano-graphene, 25 parts of partial sizes be 10-20nm nm-class boron nitride and 10 parts
The nano aluminium oxide that partial size is 20-30nm is added in 50 parts of water, is uniformly mixed to obtain solution B；
A3, solution B are stirred under the mixing speed of 1200r/min, and solution B is added with the speed of 10Kg/min in solution A
In, it is uniformly mixed to obtain solution C；
A4, by 1.8 parts of partial sizes be 20-30nm nano magnesia and 0.9 part of partial size be 20-30nm nano aluminium oxide be added to
Solution C is uniformly mixed to obtain ceramic coating.
(2) spraying process of anti-corrosion anti-coking high-temperature nano ceramic coating is prepared
B1, matrix surface cleaning: boiler tube carries out blasting treatment with 20 mesh quartz sands as matrix, to the outer surface of boiler tube, makes base
Body surface face reaches Sa3.0 grades of ISO08501-1 (GB8923-88) requirements；
B2, matrix surface are cleaned with the aqueous solution for the aluminium dihydrogen phosphate for being added to 2.5wt% and carry out drying drying；
B3, normal temperature air spraying: the ceramic coating that 1.0MPa compressed air is prepared into matrix surface spraying process (1),
3 progress gradation sprayings of spraying point are spaced 6h every time between spraying, all room temperature 24 hours solidifications, 80 DEG C of perseverances after spraying
Warm 6h；
B4, sinter molding: 380-400 DEG C of sintering 6h forms to obtain the nano ceramic coat that average thickness is 0.2mm.
Embodiment 2
The difference of embodiment 2 and embodiment 1 is:
The partial size of nano aluminium oxide is 10-20nm in step (1), and the additional amount of nano aluminium oxide is 10 in parts by weight
Part.
Embodiment 3
The difference of embodiment 3 and embodiment 1 is:
The partial size of nano aluminium oxide is 20-30nm in step (1), and the additional amount of nano aluminium oxide is 15 in parts by weight
Part.
Embodiment 4
The difference of embodiment 4 and embodiment 1 is:
The partial size of nano aluminium oxide is 30-40nm in step (1), and the additional amount of nano aluminium oxide is 10 in parts by weight
Part.
Comparative example 1
The difference of comparative example 1 and embodiment 1 is:
The partial size of nano aluminium oxide is 20-30nm in step (1), and the additional amount of nano aluminium oxide is 8 parts in parts by weight.
Comparative example 2
The difference of comparative example 2 and embodiment 1 is:
The partial size of nano aluminium oxide is 20-30nm in step (1), and the additional amount of nano aluminium oxide is 18 in parts by weight
Part.
Embodiment 5
The difference of embodiment 5 and embodiment 1 is:
The partial size of nano-graphene is 20-40nm in step (1), and the additional amount of nano-graphene is 30 in parts by weight
Part.
Embodiment 6
The difference of embodiment 6 and embodiment 1 is:
The partial size of nano-graphene is 20-40nm in step (1), and the additional amount of nano-graphene is 40 in parts by weight
Part.
Embodiment 7
The difference of embodiment 7 and embodiment 1 is:
The partial size of nano-graphene is 10-20nm in step (1), and the additional amount of nano-graphene is 35 in parts by weight
Part.
Embodiment 8
The difference of embodiment 8 and embodiment 1 is:
The partial size of nano-graphene is 40-60nm in step (1), and the additional amount of nano-graphene is 35 in parts by weight
Part.
Comparative example 3
The difference of comparative example 3 and embodiment 1 is:
The partial size of nano-graphene is 20-40nm in step (1), and the additional amount of nano-graphene is 27 in parts by weight
Part.
Comparative example 4
The difference of comparative example 4 and embodiment 1 is:
The partial size of nano-graphene is 20-40nm in step (1), and the additional amount of nano-graphene is 42 in parts by weight
Part.
Embodiment 9
The difference of embodiment 9 and embodiment 1 is:
The partial size of nm-class boron nitride is 10-20nm in step (1), and the additional amount of nm-class boron nitride is 15 in parts by weight
Part.
Embodiment 10
The difference of embodiment 10 and embodiment 1 is:
The partial size of nm-class boron nitride is 10-20nm in step (1), and the additional amount of nm-class boron nitride is 20 in parts by weight
Part.
Embodiment 11
The difference of embodiment 11 and embodiment 1 is:
The partial size of nm-class boron nitride is 20-30nm in step (1), and the additional amount of nm-class boron nitride is 25 in parts by weight
Part.
Embodiment 12
The difference of embodiment 12 and embodiment 1 is:
The partial size of nm-class boron nitride is 30-40nm in step (1), and the additional amount of nm-class boron nitride is 25 in parts by weight
Part.
Comparative example 5
The difference of comparative example 5 and embodiment 1 is:
The partial size of nm-class boron nitride is 10-20nm in step (1), and the additional amount of nm-class boron nitride is 13 in parts by weight
Part.
Comparative example 6
The difference of comparative example 6 and embodiment 1 is:
The partial size of nm-class boron nitride is 10-20nm in step (1), and the additional amount of nm-class boron nitride is 27 in parts by weight
Part.
Embodiment 13
The difference of embodiment 13 and embodiment 1 is:
The partial size of nano magnesia is 20-30nm in step (1), and the additional amount of nano magnesia is 1.0 in parts by weight
Part；The partial size of nano zine oxide is 20-40nm, and the additional amount of nano zine oxide is 0.5 part in parts by weight.
Embodiment 14
The difference of embodiment 14 and embodiment 1 is:
The partial size of nano magnesia is 20-30nm in step (1), and the additional amount of nano magnesia is 1.5 in parts by weight
Part；The partial size of nano zine oxide is 20-40nm, and the additional amount of nano zine oxide is 1.0 parts in parts by weight.
Embodiment 15
The difference of embodiment 15 and embodiment 1 is:
The partial size of nano magnesia is 20-30nm in step (1), and the additional amount of nano magnesia is 2.0 in parts by weight
Part；The partial size of nano zine oxide is 20-40nm, and the additional amount of nano zine oxide is 1.0 parts in parts by weight.
Embodiment 16
The difference of embodiment 16 and embodiment 1 is:
The partial size of nano magnesia is 30-40nm in step (1), and the additional amount of nano magnesia is 1.8 in parts by weight
Part；The partial size of nano zine oxide is 10-20nm, and the additional amount of nano zine oxide is 0.9 part in parts by weight.
Embodiment 17
The difference of embodiment 17 and embodiment 1 is:
The partial size of nano magnesia is 30-40nm in step (1), and the additional amount of nano magnesia is 1.8 in parts by weight
Part；The partial size of nano zine oxide is 30-40nm, and the additional amount of nano zine oxide is 0.9 part in parts by weight.
Comparative example 7
The difference of comparative example 7 and embodiment 1 is:
The partial size of nano magnesia is 20-30nm in step (1), and the additional amount of nano magnesia is 0.8 in parts by weight
Part；The partial size of nano zine oxide is 20-30nm, and the additional amount of nano zine oxide is 0.4 part in parts by weight.
Comparative example 8
The difference of comparative example 8 and embodiment 1 is:
The partial size of nano magnesia is 20-30nm in step (1), and the additional amount of nano magnesia is 2.2 in parts by weight
Part；The partial size of nano zine oxide is 20-30nm, and the additional amount of nano zine oxide is 1.1 parts in parts by weight.
Embodiment 18
The difference of embodiment 18 and embodiment 1 is:
The additional amount of aluminium dihydrogen phosphate is 10 parts in parts by weight in step (1).
Embodiment 19
The difference of embodiment 19 and embodiment 1 is:
The additional amount of aluminium dihydrogen phosphate is 12 parts in parts by weight in step (1).
Embodiment 20
The difference of embodiment 20 and embodiment 1 is:
The additional amount of aluminium dihydrogen phosphate is 15 parts in parts by weight in step (1).
Comparative example 9
The difference of comparative example 9 and embodiment 1 is:
The additional amount of aluminium dihydrogen phosphate is 9 parts in parts by weight in step (1).
Comparative example 10
The difference of comparative example 10 and embodiment 1 is:
The additional amount of aluminium dihydrogen phosphate is 16 parts in parts by weight in step (1).
Embodiment 21
The difference of embodiment 21 and embodiment 1 is:
45 parts according to parts by weight of water in step (1) in A1,45 parts according to parts by weight of water in step A2, the stirring speed of A3
Degree is 1000r/min.
Embodiment 22
The difference of embodiment 22 and embodiment 1 is:
48 parts according to parts by weight of water in step (1) in A1,45 parts according to parts by weight of water in step A2, the stirring speed of A3
Degree is 1100r/min.
Comparative example 11
The difference of comparative example 11 and embodiment 1 is:
40 parts according to parts by weight of water in step (1) in A1,40 parts according to parts by weight of water in step A2, the stirring speed of A3
Degree is 800r/min.
Comparative example 12
The difference of comparative example 12 and embodiment 1 is:
55 parts according to parts by weight of water in step (1) in A1,55 parts according to parts by weight of water in step A2, the stirring speed of A3
Degree is 800r/min.
Embodiment 23
The difference of embodiment 23 and embodiment 1 is:
Aqueous solution does not add aluminium dihydrogen phosphate in B2 in step (2).
Embodiment 24
The difference of embodiment 24 and embodiment 1 is:
The additive amount of aluminium dihydrogen phosphate is 0.5wt% in aqueous solution in B2 in step (2).
Embodiment 25
The difference of embodiment 25 and embodiment 1 is:
The additive amount of aluminium dihydrogen phosphate is 0.8wt% in aqueous solution in B2 in step (2).
Embodiment 26
The difference of embodiment 26 and embodiment 1 is:
The additive amount of aluminium dihydrogen phosphate is 1wt% in aqueous solution in B2 in step (2).
Embodiment 27
The difference of embodiment 27 and embodiment 1 is:
The additive amount of aluminium dihydrogen phosphate is 1.5wt% in aqueous solution in B2 in step (2).
Embodiment 28
The difference of embodiment 28 and embodiment 1 is:
The additive amount of aluminium dihydrogen phosphate is 2wt% in aqueous solution in B2 in step (2).
Embodiment 29
The difference of embodiment 29 and embodiment 1 is:
The additive amount of aluminium dihydrogen phosphate is 0.8wt% in aqueous solution in B2 in step (2).
Embodiment 30
The difference of embodiment 30 and embodiment 1 is:
The additive amount of aluminium dihydrogen phosphate is 3.2wt% in aqueous solution in B2 in step (2).
Embodiment 31
Embodiment 31 the difference from embodiment 1 is that:
Matrix surface all reaches Sa2.5 grades of ISO08501-1 (GB8923-88) requirements after B1 blasting treatment in step (2).
Embodiment 32
Embodiment 32 the difference from embodiment 1 is that:
B3 is sprayed in 0.8MPa compressed air to matrix surface in step (2), point 4 sprayings；B4 is sintered 5h molding, is averaged
With a thickness of the nano ceramic coat of 0.25mm.
Embodiment 33
Embodiment 33 the difference from embodiment 1 is that:
B3 is sprayed in 0.9MPa compressed air to matrix surface in step (2), point 4 sprayings；B4 is sintered 5h molding, is averaged
With a thickness of the nano ceramic coat of 0.23mm.
Embodiment 34
Embodiment 34 the difference from embodiment 1 is that:
The average thickness of obtained nano ceramic coat is 0.18mm.
Embodiment 35
Embodiment 35 the difference from embodiment 1 is that:
The average thickness of obtained nano ceramic coat is 0.26mm.
Embodiment 36
Embodiment 36 the difference from embodiment 1 is that:
Omit the B2 in step (2).
Embodiment 37
Embodiment 37 the difference from embodiment 1 is that:
Omit the B1 in step (2).
Embodiment 38
Embodiment 38 the difference from embodiment 1 is that:
Omit the B1 and B2 in step (2).
Embodiment 39
Embodiment 39 the difference from embodiment 1 is that:
Matrix surface all reaches Sa2.0 grades of ISO08501-1 (GB8923-88) requirements after B1 blasting treatment in step (2).
Embodiment 40
Embodiment 40 the difference from embodiment 1 is that:
B3 is sprayed 1 time in step (2).
The embodiment 1-40 and comparative example 1-12 nano ceramic coat prepared is tested for the property respectively, concrete outcome
It is shown in Table 1-8.
The test non-stick of nano ceramic coat uses the water contact angle on the surface of test nano ceramic coat.Nanometer pottery
The adhesion strength of porcelain coating and matrix is carried out according to GB8642-1988 standard, and with bonding pulling method, binder uses high strength loop
Oxygen resin.The tensile strength of nano ceramic coat is carried out according to GB8642-2002 standard.The thermal shock resistance of nano ceramic coat is adopted
It with thermal shock resistance test, tests nano ceramic coat and undergoes 1200 DEG C and Water-cooling circulating, the thermal shock resistance of nano ceramic coat is with receiving
Rice ceramic coating experience circulation still keeps the complete maximum times of macroscopic view.The thermal conductivity of nano ceramic coat uses thermally conductive point of laser
Analyzer is tested.
The performance test results of nano ceramic coat prepared by 1 embodiment 1-4 of table and comparative example 1,2
As shown in Table 1, nano aluminium oxide can increase nanometer as filler, the amount and size of addition in a certain range
The tensile strength of ceramic coating.But nano aluminium oxide can make the viscous of nano ceramic coat when being added excessive or when partial size is larger
Knotting strength, thermal conductivity and thermal shock performance reduce.
The performance test results of nano ceramic coat prepared by 2 embodiment 1 of table, 5-8 and comparative example 3,4
As shown in Table 2, nano-graphene it is undersized when be easy to happen aggregation, be unfavorable for the intensity of nano ceramic coat
And thermal shock performance.Nanometer is the oversized non-stick and adhesion strength for being unfavorable for nano ceramic coat of graphene.Nanometer stone
Black alkene is in the range of 30-40 parts, and with the increase of the content of nano-graphene, the thermal conductivity of nano ceramic coat increases, but
It is that the additional amount of nano-graphene is unfavorable for nano ceramic coat surface hydrophobic and adhesion strength when excessive.
The performance test results of nano ceramic coat prepared by 3 embodiment 1 of table, 9-12 and comparative example 5,6
As shown in Table 3, increase the non-stick of the surface of nano ceramic coat when the partial size of nm-class boron nitride is smaller, be conducive to
Anti-coking.And the thermal conductivity of nm-class boron nitride is higher, the nm-class boron nitride of smaller size is evenly distributed in nano ceramic coat
Conducive to the thermal conductivity of nano ceramic coat.But the additional amount of nm-class boron nitride is excessively detrimental to nano ceramic coat intensity.
The performance test results of nano ceramic coat prepared by 4 embodiment 1 of table, 13-17 and comparative example 7,8
As shown in Table 4, nano magnesia and nano zine oxide be as curing agent, at high temperature with inorganic binder phosphoric acid hydrogen
Two aluminium, which are reacted, is fixed on the nano ceramic coat of formation on matrix, with the addition of nano magnesia and nano zine oxide
The increase of amount, be conducive to inorganic binder fully reacting, increase the adhesion strength and tensile strength of nano ceramic coat.But
The additional amount of nano magnesia and nano zine oxide is unfavorable for the increase of the thermal conductivity of nano ceramic coat when excessive.It is nano oxidized
The partial size of magnesium and nano zine oxide is conducive to increase the uniformity of dispersion when smaller, apply conducive to uniformly bright and clean nano ceramics is formed
Layer.
The performance test results of nano ceramic coat prepared by 5 embodiment 1 of table, 18-20 and comparative example 9,10
As shown in Table 5, as inorganic binder, additional amount is conducive to increase nanometer pottery aluminium dihydrogen phosphate at 10-15 parts
The adhesion strength and tensile strength of porcelain coating.But aluminium dihydrogen phosphate it is excessive when, the viscosity of one side solution is excessive to be unfavorable for
Grain dispersion, is on the other hand also unfavorable for the increase of the thermal conductivity of nano ceramic coat.
The performance test results of nano ceramic coat prepared by 6 embodiment 1 of table, 21-22 and comparative example 11,12
As shown in Table 6, it is applied in the spraying that the viscosity and uniformity for preparing ceramic coating influence nano ceramic coat
Work and molding smoothness and intensity.
The performance test results of nano ceramic coat prepared by 7 embodiment 1 of table, 23-30
As shown in Table 7, it is known in spraying process from embodiment 1,23-30, phosphoric acid hydrogen two is added in the solution of cleaning
Aluminium first coats one layer of inorganic binder on matrix surface, is conducive to the adhesion strength for improving nano ceramic coat and base, but
It is the reduction that nano ceramic coat thermal conductivity is easy to cause when additional amount is excessive.
The performance test results of nano ceramic coat prepared by 8 embodiment 1 of table, 31-40
As shown in Table 8, it carries out being sprayed by several times in spraying process, is conducive to the final thickness for controlling nano ceramic coat
And the abundant volatilization and drying of the moisture in ceramic coating, it avoids destroying nanometer pottery at steam in sinter molding Shi Youshui
Porcelain coating influences the hydrophobicity of nano ceramic coat and non-stick.
The embodiment of present embodiment is presently preferred embodiments of the present invention, not limits protection of the invention according to this
Range, therefore: the equivalence changes that all structures under this invention, shape, principle are done, should all be covered by protection scope of the present invention it
It is interior.
Claims (9)
1. a kind of anti-corrosion anti-coking high-temperature nano ceramic coating, which is characterized in that it is sprayed by ceramic coating, it is described to receive
Rice ceramic coating includes following component according to parts by weight:
90-100 parts of water
10-15 parts of nano aluminium oxide
30-40 parts of nano-graphene
15-25 parts of nm-class boron nitride
10-15 parts of aluminium dihydrogen phosphate
1-2 parts of nano magnesia
0.5-1 parts of nano zine oxide.
2. a kind of anti-corrosion anti-coking high-temperature nano ceramic coating according to claim 1, which is characterized in that the nanometer stone
The average grain diameter of black alkene is 20-40nm.
3. a kind of anti-corrosion anti-coking high-temperature nano ceramic coating according to claim 1 or 2, which is characterized in that described to receive
The average grain diameter of rice boron nitride is 10-20nm.
4. a kind of anti-corrosion anti-coking high-temperature nano ceramic coating according to claim 1, which is characterized in that the nano oxygen
The average grain diameter for changing aluminium is 20-30nm.
5. a kind of anti-corrosion anti-coking high-temperature nano ceramic coating according to claim 1, which is characterized in that the nano oxygen
The average grain diameter for changing magnesium is 20-30nm, and the average grain diameter of the nano aluminium oxide is 20-30nm.
6. a kind of anti-corrosion anti-coking high-temperature nano ceramic coating according to claim 1, which is characterized in that the nanometer pottery
The preparation method of porcelain coating includes the following steps:
A1, aluminium dihydrogen phosphate is added in 45-50 parts of water and is dissolved, sealing obtains solution A in 12 hours；
A2, nano-graphene, nm-class boron nitride and nano aluminium oxide are added in 45-50 parts of water, are uniformly mixed and obtain solution
B；
A3, solution B are stirred under the mixing speed of 1000-1200r/min, and solution A is added with the speed of 10Kg/min
In solution B, it is uniformly mixed and obtains solution C；
A4, nano magnesia and nano aluminium oxide are added to solution C, are uniformly mixed.
7. a kind of spraying process for preparing anti-corrosion anti-coking high-temperature nano ceramic coating described in any one of claims 1-6,
It is characterized in that, includes the following steps:
B1, matrix surface cleaning: blasting treatment is carried out to matrix surface, matrix surface is made to reach 2.5-3.0 grades of Sa requirements；
B2, matrix surface are washed and dried with water；
B3, normal temperature air spraying: 0.8-1.0MPa compressed air spraying, spraying divide 3-4 spraying, are spaced 6h between spraying, entirely
Room temperature 24 hours solidifications, 80 DEG C of constant temperature 6h after portion sprays；
B4, sinter molding: 380-400 DEG C of sintering 5-6h forms to obtain nano ceramic coat.
8. a kind of spraying process for preparing anti-corrosion anti-coking high-temperature nano ceramic coating according to claim 7, feature
Be, the nano ceramic coat with a thickness of 0.2mm-0.25mm.
9. a kind of spraying process for preparing anti-corrosion anti-coking high-temperature nano ceramic coating according to claim 7, feature
It is, the phosphoric acid hydrogen two aluminium of 1-3wt% is added in the water in the step B2.
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Application publication date: 20190621 |