CN104818482B - High temperature resistant, the low infrared emissivity composite coating of high bond strength, band coating metal alloy compositions and preparation method thereof - Google Patents
High temperature resistant, the low infrared emissivity composite coating of high bond strength, band coating metal alloy compositions and preparation method thereof Download PDFInfo
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Abstract
The low infrared emissivity composite coating of a kind of high temperature resistant, high bond strength, it includes NiCrAlY plasma sprayed coatings, ZrO successively outward by interior2The ZrO of plasma sprayed coating and the alloy containing AgPd2‑Al2O3‑SiO2It is glass coating.A kind of metal alloy compositions for being coated with aforementioned coatings, its surface roughness is less than 2.0 μm, and the bond strength of coating is more than 10MPa, and the tolerable temperature of coating is more than 1000 DEG C, and the average infrared emittance of specific band is less than 0.3.The preparation of the metal alloy compositions includes：Matrix is first subjected to blasting treatment；Then NiCrAlY layers and ZrO are sprayed using plasma spray coating process successively on matrix2Layer；Finally coating is uniformly brushed or is printed on ZrO2On layer, finished product is obtained after drying, sintering.The product of the present invention can be used in high temperature environments, effectively reduction high-temperature component infra-red radiation, and performance is stable, cost is low.
Description
Technical field
The present invention relates to functional coating and its technical field of composite materials, and in particular to a kind of low infrared emissivity is compound to be applied
Layer, metal alloy compositions and preparation method thereof.
Background technology
Infrared signal of the infrared detector to target in 3 μm~5 μm (high temperature) and 8 μm~14 μm (normal temperature) wave bands is received
Collection, recycles the infrared energy difference of target and background to recognize target by being imaged.According to infrared energy difference
Calculation formula：△ W=σ εMeshTMesh 4-σεThe back of the bodyTThe back of the body 4, in formula, εMeshFor the infrared emittance of target, εThe back of the bodyFor the infrared emittance of background, TMesh
For the surface temperature of target, TThe back of the bodyFor ambient temperature.Generally, due to reasons such as heatings, the surface temperature of target can be higher than background
Temperature, therefore, reduces target surface temperature, low-launch-rate (ε is prepared on high-temperature componentMesh) coating is reduction target and background spoke
Penetrate the effective means of strength difference.
With the high speed development of aeronautical and space technology, the flying speed of aircraft is more and more faster, from subsonic speed to velocity of sound again
To supersonic speed even superelevation velocity of sound, cause aircraft in flight, flow through the air-flow of aircraft surface due to the reasons such as friction by
To retardance, kinetic energy is changed into heat energy, produces Aerodynamic Heating phenomenon, aircraft surface temperature is drastically raised, and produces strongly red
External radiation feature, therefore, the infra-red radiation that control aircraft surface includes some hot-end components turn into Flight Vehicle Design and preparation
A trend, and as the most frequently used low emissivity coatings technology of control infra-red radiation, the resistance to elevated temperatures of its coating turns into
The problem of researcher is in the urgent need to address.
Low emissivity coatings are typically made up of binding agent and low-launch-rate filler, are divided into organic system and inorganic system two
Class.The low emissivity coatings temperature in use of organic system is not high, and temperature in use is usually no more than 400 DEG C, therefore is not suitable in height
Used under fast aircraft harsh environment.The low emissivity coatings of inorganic system are higher using warm area, and its temperature tolerance even can be with
More than 1000 DEG C, still, the low emissivity coatings using effect in high temperature environments of major part inorganic system and pay no attention at present
Think.Causing the main cause of problem above has：Firstth, performance is unstable in high temperature environments for most low-launch-rate fillers, easily
Generation transport phenomena；Secondth, the metal or alloy material of aircraft easily spreads toward surface infrared coating at high temperature, so that
Coating performance is caused to deteriorate；3rd, the thermal coefficient of expansion difference between coating and base material (such as aviation alloy material) is larger,
Thermal mismatching is produced, so as to cause the adhesion of coating poor, is easily come off；4th, metal material such as Au, Pt of existing use
Etc. expensive, cost is higher；5th, the preparation technology of existing some coatings generally requires to carry out compared with harsh environment
(such as magnetron sputtering is needed in vacuum environment), not only equipment requirement is high, and uncomfortable synthesis type prepares abnormal complex component.
In summary, with the high speed development of aeronautical and space technology, to high temperature resistant, high bond strength, low infrared emissivity
The demand of coating is increasingly urgent.Therefore, design a kind of with temperature in use is high, bond strength is high, emissivity is low and performance is stable
New coating, will have important practical significance.
The content of the invention
The technical problems to be solved by the invention are to overcome the shortcomings of to mention with defect that there is provided one in background above technology
Plant and can be used on metal alloy compositions and can in high temperature environments use, can effectively reduce high-temperature component infra-red radiation, simultaneity
Can the low high temperature resistant of stable, cost, the low infrared emissivity composite coating of high bond strength, correspondingly provide be coated with it is foregoing low
The metal alloy compositions of infrared emittance composite coating, correspondingly provide that a kind of technique is simple, operation easily, excellent product performance
Aforementioned metal alloy material preparation method.
In order to solve the above technical problems, technical scheme proposed by the present invention be a kind of high temperature resistant, high bond strength it is low red
Outer emissivity composite coating, the low infrared emissivity composite coating is multiple-layer stacked structure, and the multiple-layer stacked structure is by interior
Include metal gluing layer, ceramic interlayer and low-launch-rate functional layer successively outward, wherein, the metal gluing layer is
NiCrAlY plasma sprayed coatings, the ceramic interlayer is ZrO2Plasma sprayed coating, the low-launch-rate functional layer be containing
The ZrO of AgPd alloys2-Al2O3-SiO2It is glass coating.Each interlayer of the low infrared emissivity composite coating is with machinery knot
Close or chemical bonding mode is connected.
In above-mentioned low infrared emissivity composite coating, preferably：The thickness control of the metal gluing layer is 50~150
μm, the thickness control of the ceramic interlayer is 50~100 μm.
In above-mentioned low infrared emissivity composite coating, preferably：The ZrO of the alloy containing AgPd2-Al2O3-SiO2System
In glass coating, ZrO2-Al2O3-SiO2The mass ratio for being glass phase, metal Ag and metal Pd is (15~20): (50~65):
(20~35).More preferably：The ZrO2-Al2O3-SiO2The mass percent for being each component raw material in glass phase is respectively：
ZrO240%~60%；Al2O310%~25%；SiO215%~25%；CaO 2%~5%；MgO 1%~5%；With
B2O31%~6%.
As a total technical concept, the present invention, which is also provided, a kind of is coated with above-mentioned low infrared emissivity composite coating
Metal alloy compositions, including alloy base and the compound painting of the low infrared emissivity being coated on alloy base
Layer, the surface roughness Ra of the metal alloy compositions is less than 2.0 μm, and the bond strength of low infrared emissivity composite coating exceedes
10MPa, the tolerable temperature of the low infrared emissivity composite coating is more than 1000 DEG C, in the average infrared hair of 3~5 mu m wavebands
Rate is penetrated less than 0.3 (more preferably less than 0.2).
The design of the low infrared emissivity composite coating and its metal alloy compositions of the invention described above is based primarily upon following original
Reason：First, the thermal coefficient of expansion of the low infrared emissivity composite coating successively decreases successively from inside to outside, and this reduces the heat of each interlayer
Mismatch, it is ensured that the high bond strength of low infrared emissivity composite coating；Second, according to Infrared Physics principle, low infrared emission
In rate composite coating, control infra-red radiation depends on outermost low-launch-rate functional layer；The low-launch-rate work(of the present invention
Ergosphere uses ZrO2-Al2O3-SiO2It is that glass is binding agent, metal Ag and metal Pd are low-launch-rate filler, are used as binding agent
ZrO2-Al2O3-SiO2Be glass, its temperature tolerance and inoxidizability are fine, it is ensured that coating be on active service at relatively high temperatures and
Do not fail；As the metal Ag and metal Pd of filler, continuous solid solution alloy, that is, the painting after sintering can be formed in sintering process
Metal Ag and metal Pd are present in the form of alloy in layer, and alloy structure is very fine and close, is not in simple metal Ag migration
Diffusion phenomena, so as to improve the high-temperature stability of coating, it is ensured that the low infrared emissivity of coating under high temperature；3rd, the present invention
Also directly binded with alloy base material as metal gluing layer using NiCrAlY plasma sprayed coatings, this be mainly by
It is closest in the thermal coefficient of expansion of NiCrAlY materials in itself and conventional metal alloy compositions, bond strength between the two compared with
By force, meanwhile, the antioxygenic property of NiCrAlY materials is also preferable, can prevent outside air oxidized metal alloy material；4th,
The present invention also uses ZrO2Plasma sprayed coating is as ceramic interlayer, partly in order to further reduction thermal coefficient of expansion ladder
Degree is poor, prevents the problems such as anchoring strength of coating that thermal mismatching is brought is poor, on the other hand, can be with barrier metal or alloy material in height
Temperature is lower to cause coating performance to deteriorate toward the diffusion of low-launch-rate functional layer.
As a total technical concept, the present invention also provides a kind of preparation method of above-mentioned metal alloy compositions, wraps
Include following steps：
(1) substrate blasting treatment：The alloy base for needing to cover low infrared emissivity composite coating is placed in sandblasting
Blasting treatment is carried out in machine；The preferred technological parameter condition of blasting treatment includes：Air pressure control is 3~5MPa, sandblasting distance 30
~50mm, sand particle diameter is 50~100 μm, 20~60min of blast time；
(2) spray metal gluing layer：Sprayed using plasma spray coating process on the alloy base after step (1)
NiCrAlY plasma sprayed coatings；
(3) ceramic coated transition zone：The NiCrAlY plasma sprays obtained using plasma spray coating process after step (2)
Continue to spray ZrO on coating2Plasma sprayed coating；
(4) low-launch-rate functional layer is prepared：Obtained glass dust and metal Ag, metal Pd are mixed to prepare coating, then adopted
With spread coating or silk screen print method, the ZrO obtained during coating is uniformly brushed or printed in step (3)2Plasma sprayed coating
On, the thickness of low-launch-rate functional layer can be regulated and controled by brushing (or printing) number of times for adjusting coating, (be placed on through drying
Air apoplexy mainstream is flat or dries in an oven), sintering (being placed in Muffle furnace) obtain finished product afterwards.
Above-mentioned preparation method, it is preferred that in the step (2) and step (3), the technological parameter of plasma spray coating process
Condition includes：Ar ventilation flow rate is 20~40NL/min, H2Ventilation flow rate be 8~12NL/min；Powder feeding air-flow Ar is 2.5
~3.2NL/min, powder sending quantity 10%~30%；Size of current control is 500~600A, and power is 30~50kW；Shower nozzle and base
The distance of plate is 100~150mm.
Above-mentioned preparation method, it is preferred that in the step (4), the preparation of the glass dust specifically includes following steps：
ZrO will be included2、Al2O3、SiO2、CaO、MgO、B2O3Frit powder in the well mixed (dress of above-mentioned mass fraction ratio
Enter in platinum crucible), then be placed in Muffle furnace and carry out high melt, the glass melt after fusing is poured into deionized water and carried out
Quenching, ball milling is carried out by obtained glass, and drying, sieving (preferably referred to 200 mesh~400 mesh sieve) obtains glass dust.
The mass fraction of each oxide components is respectively preferably in foregoing glass material powder：
In the preparation of above-mentioned glass dust, the process regulation of the high melt process is preferably included：Smelting temperature is
1600 DEG C~1800 DEG C, melting soaking time is 1h~3h.
In the preparation of above-mentioned glass dust, it is preferred that the ball milling is carried out in zirconia ball grinding jar, using acetone as ball milling
Medium, ratio of grinding media to material is (2~3): 1, rotational speed of ball-mill is 380r/min~450r/min, and Ball-milling Time is 6h~12h.
Above-mentioned preparation method, in the preparation of the coating, it is preferred that the glass dust and metal Ag, metal Pd be
Mixed in planetary gravity mixer, the technological parameter of the planetary gravity mixer is preferably included：Revolution speed 1280rpm
~1500rpm, rotational velocity is 30%~60%, 60~120min of mixing time.Further, the preparation of the coating be by
The compound of glass dust and metal Ag, metal Pd is mixed with organic carrier by three-roll grinder again, and three-roll grinder turns
Speed is preferably 250~450r/min, and grinding mixing time is preferably 3~6h, and the mass fraction of wherein compound accounts for 75%~
80%, the mass fraction of organic carrier accounts for 25%~20%.The organic carrier is main by ATBC (solvent), nitric acid
Cellulose (thickener) and lecithin (surfactant) are constituted, and mass percent of the three in organic carrier is respectively：
ATBC 70%~80%；
Nitrocellulose 2%~10%；
Lecithin 10%~20%；
The viscosity control of the coating prepared is 170~300Pas.
Above-mentioned preparation method, it is preferred that in the step (4), sintering is general to be placed in carrying out in Muffle furnace, described to burn
Sintering temperature during knot is 1000 DEG C~1050 DEG C, and programming rate is 15 DEG C/min~20 DEG C/min, sintering time be 10min~
60min。
Compared with prior art, the advantage of the invention is that：
1st, high temperature resistant of the invention, the low infrared emissivity composite coating of high bond strength are set using multiple-layer stacked structure
Meter, from inside to outside, metal gluing layer, ceramic interlayer arrive low-launch-rate functional layer again, and the thermal coefficient of expansion of each layer realizes gradient
Slowly successively decrease, so as to reduce the thermal mismatching of each interlayer so that anchoring strength of coating is very excellent, the adhesive force of coating can reach
To 25MPa.
2nd, high temperature resistant of the invention, the low infrared emissivity composite coating of high bond strength are using unique metal gluing layer
With ceramic interlayer design, the High temperature diffusion between base metal material and low-launch-rate functional layer is on the one hand prevented, it is another
Aspect prevents the oxidation behaviors of base metal material, and more traditional individual layer low-launch-rate functional layer is more stable, it is ensured that
Coating material is used under 1000 DEG C of hot environment.
3rd, ZrO is mainly included in low-launch-rate functional layer of the invention2-Al2O3-SiO2It is glass phase and AgPd alloy phases
(referred to sinter after thing phase), two-phase can all be used under 1000 DEG C of hot environments, and infrared emittance at 1000 DEG C can be with
Less than 0.3, more conventional organic material system temperature in use is significantly increased, more current inorganic material coating system high-temperature
Stability and emissivity are significantly improved.
4th, the low-launch-rate filler added in low-launch-rate functional layer of the invention is Ag and Pd, and other noble metals, all
Such as Au, Pt are compared, and cost is cheaply a lot, meanwhile, Ag and Pd form solid solution thereof in sintering process, overcome again simple
Add migration problem caused by Ag.
5th, plasma spraying technology is used in preparation method of the invention, can carried out in atmosphere, not only cost
Low, process equipment requires low, and is adapted to prepare shaped piece and complex component.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are the present invention
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 is high temperature resistant, the section signal of the low infrared emissivity composite coating of high bond strength in the embodiment of the present invention
Figure.
Fig. 2 is high temperature resistant, the material object on the low infrared emissivity composite coating surface of high bond strength in the embodiment of the present invention 1
Photo.
Fig. 3 be the embodiment of the present invention 1 in high temperature resistant, high bond strength low infrared emissivity composite coating material object 600
DEG C, 800 DEG C, at 1000 DEG C 3~5 mu m wavebands average emitted rate.
Marginal data
1st, alloy base；2nd, metal gluing layer；3rd, ceramic interlayer；4th, low-launch-rate functional layer.
Embodiment
For the ease of understanding the present invention, more complete is made to the present invention below in conjunction with Figure of description and preferred embodiment
Face, meticulously describe, but protection scope of the present invention is not limited to embodiment in detail below.
Unless otherwise defined, the implication that all technical terms used hereinafter are generally understood that with those skilled in the art
It is identical.Technical term used herein is intended merely to describe the purpose of specific embodiment, is not intended to the limitation present invention
Protection domain.
Unless otherwise specified, various raw material, reagent, instrument and equipment used in the present invention etc. can be by city
Field is commercially available or can prepared by existing method.
Embodiment 1：
As shown in figure 1, a kind of be coated with high temperature resistant of the present invention, the gold of the low infrared emissivity composite coating of high bond strength
Belong to alloy material, including alloy base 1 (alloy base is using Aero-Space K424 alloys) and be coated in metal
Low infrared emissivity composite coating on alloy substrate 1, the low infrared emissivity composite coating is multiple-layer stacked structure, multi-laminate
Plus structure includes metal gluing layer 2, ceramic interlayer 3 and low-launch-rate functional layer 4 successively outward by interior, wherein, metal is sticked
Knot layer 2 is NiCrAlY plasma sprayed coatings, and ceramic interlayer 3 is ZrO2Plasma sprayed coating, low-launch-rate functional layer 4 be containing
The ZrO of AgPd alloys2-Al2O3-SiO2It is glass coating.The thickness control of metal gluing layer 2 is 100 μm, ceramic interlayer 3
Thickness control is 50 μm, and the thickness control of low-launch-rate functional layer 4 is 15 μm.In the ZrO of the alloy containing AgPd2-Al2O3-SiO2System
In glass coating, ZrO2-Al2O3-SiO2The mass ratio for being glass phase, metal Ag and metal Pd is 20: 60: 20.In ZrO2-
Al2O3-SiO2The mass percent for being each component in glass phase is respectively：ZrO250%；Al2O315%；SiO225%；CaO
3%；MgO 2% and B2O35%.
The surface roughness Ra of the metal alloy compositions of the present embodiment is 1.2 μm, the knot of low infrared emissivity composite coating
Conjunction intensity is 17MPa (using hubbing), and the tolerable temperature of low infrared emissivity composite coating is up to 1000 DEG C, in 3~5 μm of ripples
The average infrared emittance of section is less than 0.3.
The preparation method of the metal alloy compositions of the present embodiment, specifically includes following preparation process：
1. substrate blasting treatment：By Aero-Space K424 alloy substrates, carried out in sand-blasting machine at blasting treatment, sandblasting
The technological parameter of reason is respectively：Air pressure control is 3MPa, and sandblasting is 50 μm apart from 30mm, sand particle diameter, and blast time is
20min；
2. spray metal gluing layer：Sprayed using plasma spray coating process on the K424 alloy substrates after step (1)
NiCrAlY plasma sprayed coatings；The technological parameter condition of plasma spray coating process includes：Ar ventilation flow rate is 20NL/min,
H2Ventilation flow rate be 8NL/min；Powder feeding air-flow Ar is 3NL/min, powder sending quantity 10%；Electric current 500A, power 30kW；Shower nozzle and
Alloy substrate apart from 100mm, spray 10 times；
3. ceramic coated transition zone：The NiCrAlY plasma sprayings obtained using plasma spray coating process after step (2)
Continue to spray ZrO on layer2Plasma sprayed coating；The technological parameter condition of plasma spray coating process includes：Ar ventilation flow rate is
32NL/min, H2Ventilation flow rate be 12NL/min；Powder feeding air-flow Ar is 3.2NL/min, powder sending quantity 15%；Electric current 550A, work(
Rate 40kW；Shower nozzle and alloy substrate apart from 130mm, spray 10 times；
4. prepare low-launch-rate functional layer：
4.1 smelting glass：ZrO will be included2、Al2O3、SiO2、CaO、MgO、B2O3Frit powder be well mixed, dress
Enter in platinum crucible, then be placed in together in Muffle furnace, 1600 DEG C are raised to 20 DEG C/min, 3h is incubated, then, by the glass after fusing
Glass melt, which is poured into, carries out quenching in deionized water, that is, obtains required glass；
4.2 crush glass：The glass that above-mentioned melting is obtained carries out ball milling, and ball milling is carried out in zirconia ball grinding jar, with
Acetone is ball-milling medium, and ratio of grinding media to material is 2: 1, and rotating speed is 450r/min, Ball-milling Time be 100 DEG C of drying 1h after the completion of 8h, ball milling,
400 mesh sieves are crossed, the glass dust of particle diameter needed for obtaining；
4.3 batch mixing：By the glass dust after above-mentioned pulverize and sieve, metal Ag powder and metal Pd powder according to mass ratio 20: 60: 20
Ratio, the batch mixing in planetary gravity mixer, the revolution speed of mixer is 1460rpm, rotational velocity 30%, and the time is
120min；
4.4 prepare coating：First by ATBC, nitrocellulose and lecithin according to 80: 5: 15 mass ratio
It is configured to organic carrier；Then, obtained compound in above-mentioned steps 4.3 is mixed with organic carrier by 75: 25 mass ratio,
Then batch mixing is ground in three-roll grinder, rotating speed is 300r/min, grinding mixing time is 3h, obtains low infrared emissivity and be combined
The coating of coating, the viscosity of coating is 220Pas；
4.5 prepares coating：The ZrO obtained in step 3 using spread coating2On plasma sprayed coating, uniformly brush above-mentioned
Obtained coating, brush 1 time, be sintered after then drying 30min, drying at a temperature of 150 DEG C, programming rate be 20 DEG C/
Min, 1000 DEG C of sintering temperature, sintering time 10min, then obtain the present embodiment is coated with high temperature resistant of the present invention, high combination
The metal alloy compositions of the low infrared emissivity composite coating of intensity (referring to Fig. 2).
The surface roughness Ra of low infrared emissivity composite coating made from the present embodiment is 1.2 μm, anchoring strength of coating
For 17MPa, as shown in figure 3, testing average emitted rate value of its infrared emittance at 600 DEG C, 800 DEG C, 1000 DEG C respectively, survey
Test result is respectively 0.137,0.163 and 0.182.
Embodiment 2：
As shown in figure 1, a kind of be coated with high temperature resistant of the present invention, the gold of the low infrared emissivity composite coating of high bond strength
Belong to alloy material, including alloy base 1 (alloy base use 1Cr17 stainless steel substrates) and be coated in metal alloy
Low infrared emissivity composite coating on matrix 1, the low infrared emissivity composite coating is multiple-layer stacked structure, multiple-layer stacked knot
Structure includes metal gluing layer 2, ceramic interlayer 3 and low-launch-rate functional layer 4 successively outward by interior, wherein, metal gluing layer 2
For NiCrAlY plasma sprayed coatings, ceramic interlayer 3 is ZrO2Plasma sprayed coating, low-launch-rate functional layer 4 is to be closed containing AgPd
The ZrO of gold2-Al2O3-SiO2It is glass coating.The thickness control of metal gluing layer 2 is 80 μm, the thickness control of ceramic interlayer 3
80 μm are made as, the thickness control of low-launch-rate functional layer 4 is 28 μm.In the ZrO of the alloy containing AgPd2-Al2O3-SiO2It is that glass is applied
In layer, ZrO2-Al2O3-SiO2The mass ratio for being glass phase, metal Ag and metal Pd is 15: 65: 20.In ZrO2-Al2O3-SiO2
The mass percent for being each component in glass phase is respectively：ZrO245%；Al2O325%；SiO220%；CaO 5%；MgO 2%
And B2O33%.
The surface roughness Ra of the metal alloy compositions of the present embodiment is 1.0 μm, the knot of low infrared emissivity composite coating
Conjunction intensity is 22MPa, and the tolerable temperature of low infrared emissivity composite coating is up to 1000 DEG C, in the average infrared of 3~5 mu m wavebands
Emissivity is less than 0.3.
The preparation method of the metal alloy compositions of the present embodiment, specifically includes following preparation process：
1. substrate blasting treatment：By 1Cr17 stainless steel substrates, blasting treatment, the work of blasting treatment are carried out in sand-blasting machine
Skill parameter is respectively：Air pressure control is 5MPa, and sandblasting is 80 μm apart from 50mm, sand particle diameter, and blast time is 40min；
2. spray metal gluing layer：Sprayed using plasma spray coating process on the 1Cr17 stainless steel substrates after step (1)
NiCrAlY plasma sprayed coatings；The technological parameter condition of plasma spray coating process includes：Ar ventilation flow rate is 30NL/min,
H2Ventilation flow rate be 10NL/min；Powder feeding air-flow Ar is 2.5NL/min, powder sending quantity 20%；Electric current 600A, power 40kW；Spray
Head and stainless steel substrate are sprayed 8 times apart from 120mm；
3. ceramic coated transition zone：The NiCrAlY plasma sprayings obtained using plasma spray coating process after step (2)
Continue to spray ZrO on layer2Plasma sprayed coating；The technological parameter condition of plasma spray coating process includes：Ar ventilation flow rate is
30NL/min, H2Ventilation flow rate be 10NL/min；Powder feeding air-flow Ar is 2.5NL/min, powder sending quantity 20%；Electric current 600A, work(
Rate 40kW；Shower nozzle and stainless steel substrate apart from 120mm, spray 8 times；
4. prepare low-launch-rate functional layer：
4.1 smelting glass：ZrO will be included2、Al2O3、SiO2、CaO、MgO、B2O3Frit powder be well mixed, dress
Enter in platinum crucible, then be placed in together in Muffle furnace, 1800 DEG C are raised to 20 DEG C/min, 3h is incubated, then, by the glass after fusing
Glass melt, which is poured into, carries out quenching in deionized water, that is, obtains required glass；
4.2 crush glass：The glass that above-mentioned melting is obtained carries out ball milling, and ball milling is carried out in zirconia ball grinding jar, with
Acetone is ball-milling medium, and ratio of grinding media to material is 3: 1, and rotating speed is 400r/min, and Ball-milling Time is 100 DEG C of drying after the completion of 12h, ball milling
1h, excessively 400 mesh sieves, the glass dust of particle diameter needed for obtaining；
4.3 batch mixing：By the glass dust after above-mentioned pulverize and sieve, metal Ag powder and metal Pd powder according to mass ratio 15: 65: 20
Ratio, the batch mixing in planetary gravity mixer, the revolution speed of mixer is 1280rpm, rotational velocity 45%, and the time is
120min；
4.4 prepare coating：First by ATBC, nitrocellulose and lecithin according to 80: 5: 15 mass ratio
It is configured to organic carrier；Then, obtained compound in above-mentioned steps 4.3 is mixed with organic carrier by 80: 20 mass ratio,
Then batch mixing is ground in three-roll grinder, rotating speed is 300r/min, grinding mixing time is 3h, obtains low infrared emissivity and be combined
The coating of coating, the viscosity of coating is 250Pas；
4.5 prepares coating：The ZrO obtained in step 3 using spread coating2On plasma sprayed coating, uniformly brush above-mentioned
Obtained coating, brush 2 times, be sintered after then drying 30min, drying at a temperature of 150 DEG C, programming rate be 20 DEG C/
Min, 1000 DEG C of sintering temperature, sintering time 15min, then obtain the present embodiment is coated with high temperature resistant of the present invention, high combination
The metal alloy compositions of the low infrared emissivity composite coating of intensity.
The surface roughness Ra of low infrared emissivity composite coating made from the present embodiment is 1.0 μm, anchoring strength of coating
For 22MPa；Average emitted rate value of its infrared emittance at 600 DEG C, 800 DEG C, 1000 DEG C, test result difference are tested respectively
For 0.108,0.145,0.170.
Embodiment 3：
As shown in figure 1, a kind of be coated with high temperature resistant of the present invention, the gold of the low infrared emissivity composite coating of high bond strength
Belong to alloy material, including alloy base 1 (alloy base use 304 steel alloys) and be coated in alloy base 1
On low infrared emissivity composite coating, the low infrared emissivity composite coating be multiple-layer stacked structure, multiple-layer stacked structure by
Inside include metal gluing layer 2, ceramic interlayer 3 and low-launch-rate functional layer 4 successively outward, wherein, metal gluing layer 2 is
NiCrAlY plasma sprayed coatings, ceramic interlayer 3 is ZrO2Plasma sprayed coating, low-launch-rate functional layer 4 is alloy containing AgPd
ZrO2-Al2O3-SiO2It is glass coating.The thickness control of metal gluing layer 2 is 150 μm, the thickness control of ceramic interlayer 3
For 100 μm, the thickness control of low-launch-rate functional layer 4 is 15 μm.In the ZrO of the alloy containing AgPd2-Al2O3-SiO2It is that glass is applied
In layer, ZrO2-Al2O3-SiO2The mass ratio for being glass phase, metal Ag and metal Pd is 15: 65: 20.In ZrO2-Al2O3-SiO2
The mass percent for being each component in glass is respectively：ZrO255%；Al2O325%；SiO215%；CaO 2%；MgO 2%；
And B2O31%.
The surface roughness Ra of the metal alloy compositions of the present embodiment is 1.5 μm, the knot of low infrared emissivity composite coating
Conjunction intensity is 25MPa, and the tolerable temperature of low infrared emissivity composite coating is up to 1000 DEG C, in the average infrared of 3~5 mu m wavebands
Emissivity is less than 0.3.
The preparation method of the metal alloy compositions of the present embodiment, specifically includes following preparation process：
1. substrate blasting treatment：304 alloy steel substrates are placed in sand-blasting machine and carry out blasting treatment, the technique of blasting treatment
Parameter is respectively：Air pressure control is 3MPa, and sandblasting is 50 μm apart from 40mm, sand particle diameter, and blast time is 30min；
2. spray metal gluing layer：Sprayed using plasma spray coating process on the 304 alloy steel substrates after step (1)
NiCrAlY plasma sprayed coatings；The technological parameter condition of plasma spray coating process includes：Ar ventilation flow rate is 30NL/min,
H2Ventilation flow rate be 10NL/min；Powder feeding air-flow Ar is 3.2NL/min, powder sending quantity 10%；Electric current 600A, power 50kW；Spray
Head and stainless steel substrate are sprayed 15 times apart from 100mm；
3. ceramic coated transition zone：The NiCrAlY plasma sprayings obtained using plasma spray coating process after step (2)
Continue to spray ZrO on layer2Plasma sprayed coating；The technological parameter condition of plasma spray coating process includes：Ar ventilation flow rate is
32NL/min, H2Ventilation flow rate be 12NL/min；Powder feeding air-flow Ar is 3.2NL/min, powder sending quantity 15%；Electric current 500A, work(
Rate 40kW；Shower nozzle and stainless steel substrate apart from 130mm, spray 10 times；
4. prepare low-launch-rate functional layer：
4.1 smelting glass：ZrO will be included2、Al2O3、SiO2、CaO、MgO、B2O3Frit powder according to the above ratio
It is well mixed, it is fitted into platinum crucible, then be placed in together in Muffle furnace, 1600 DEG C are raised to 20 DEG C/min, 1h is incubated, then,
Glass melt after fusing is poured into quenching is carried out in deionized water, that is, obtain required glass；
4.2 crush glass：The glass that above-mentioned melting is obtained carries out ball milling, and ball milling is carried out in zirconia ball grinding jar, with
Acetone is ball-milling medium, and ratio of grinding media to material is 2: 1, and rotating speed is 400r/min, and Ball-milling Time is 100 DEG C of drying after the completion of 12h, ball milling
1h, excessively 400 mesh sieves, the glass dust of particle diameter needed for obtaining；
4.3 batch mixing：By the glass dust after above-mentioned pulverize and sieve, metal Ag powder and metal Pd powder according to mass ratio 15: 65: 20
Ratio, the batch mixing in planetary gravity mixer, the revolution speed of mixer is 1500rpm, rotational velocity 50%, and the time is
120min；
4.4 prepare coating：First by ATBC, nitrocellulose and lecithin according to 80: 8: 12 mass ratio
It is configured to organic carrier；Then, obtained compound in above-mentioned steps 4.3 is mixed with organic carrier by 80: 20 mass ratio,
Then batch mixing is ground in three-roll grinder, rotating speed is 300r/min, grinding mixing time is 3h, obtains low infrared emissivity and be combined
The coating of coating, the viscosity of coating is 280Pas；
4.5 prepares coating：The ZrO obtained in step 3 using spread coating2On plasma sprayed coating, uniformly brush above-mentioned
Obtained coating, brush 1 time, be sintered after then drying 30min, drying at a temperature of 150 DEG C, programming rate be 20 DEG C/
Min, 1000 DEG C of sintering temperature, sintering time 30min, then obtain the present embodiment is coated with high temperature resistant of the present invention, high combination
The metal alloy compositions of the low infrared emissivity composite coating of intensity.
The surface roughness Ra of low infrared emissivity composite coating made from the present embodiment is 1.5 μm, anchoring strength of coating
For 25MPa；Average emitted rate value of its infrared emittance at 600 DEG C, 800 DEG C, 1000 DEG C, test result difference are tested respectively
For 0.144,0.162,0.187.
Claims (10)
1. the low infrared emissivity composite coating of a kind of high temperature resistant, high bond strength, the low infrared emissivity composite coating is
Multiple-layer stacked structure, it is characterised in that：The multiple-layer stacked structure includes metal gluing layer, ceramic interlayer successively outward by interior
And low-launch-rate functional layer, wherein, the metal gluing layer is NiCrAlY plasma sprayed coatings, and the ceramic interlayer is
ZrO2Plasma sprayed coating, the low-launch-rate functional layer is the ZrO of the alloy containing AgPd2-Al2O3-SiO2It is glass coating.
2. low infrared emissivity composite coating according to claim 1, it is characterised in that：The thickness of the metal gluing layer
Control as 50~150 μm, the thickness control of the ceramic interlayer is 50~100 μm.
3. low infrared emissivity composite coating according to claim 1 or 2, it is characterised in that：The alloy containing AgPd
ZrO2-Al2O3-SiO2In being glass coating, ZrO2-Al2O3-SiO2The mass ratio for being glass phase, metal Ag and metal Pd is (15
~20): (50~65): (20~35).
4. low infrared emissivity composite coating according to claim 3, it is characterised in that：The ZrO2-Al2O3-SiO2System
The mass percent of each component raw material is in glass phase：
ZrO240%~60%；
Al2O310%~25%；
SiO215%~25%；
CaO 2%~5%；
MgO 1%~5%；With
B2O31%~6%.
5. a kind of metal alloy compositions for being coated with low infrared emissivity composite coating any one of Claims 1 to 4, its
It is characterised by：Including alloy base and the low infrared emissivity composite coating being coated on alloy base, institute
The surface roughness Ra for stating metal alloy compositions is less than 2.0 μm, and the bond strength of low infrared emissivity composite coating exceedes
10MPa, the tolerable temperature of the low infrared emissivity composite coating is more than 1000 DEG C, in the average infrared hair of 3~5 mu m wavebands
Rate is penetrated less than 0.3.
6. a kind of preparation method of metal alloy compositions as claimed in claim 5, comprises the following steps：
(1) substrate blasting treatment：The alloy base for needing to cover low infrared emissivity composite coating is placed in sand-blasting machine
Carry out blasting treatment；
(2) spray metal gluing layer：Sprayed using plasma spray coating process on the alloy base after step (1)
NiCrAlY plasma sprayed coatings；
(3) ceramic coated transition zone：The NiCrAlY plasma sprayed coatings obtained using plasma spray coating process after step (2)
It is upper to continue to spray ZrO2Plasma sprayed coating；
(4) low-launch-rate functional layer is prepared：Obtained glass dust and metal Ag, metal Pd are mixed to prepare coating, then using brush
Coating or silk screen print method, the ZrO obtained during coating is uniformly brushed or printed in step (3)2On plasma sprayed coating,
Finished product is obtained after drying, sintering.
7. preparation method according to claim 6, it is characterised in that in the step (2) and step (3), plasma spray
Applying the technological parameter condition of technique includes：Ar ventilation flow rate is 20~40NL/min, H2Ventilation flow rate be 8~12NL/
min；Powder feeding air-flow Ar is 2.5~3.2NL/min, powder sending quantity 10%~30%；Size of current control is 500~600A, power
For 30~50kW；The distance of shower nozzle and substrate is 100~150mm.
8. preparation method according to claim 6, it is characterised in that the preparation of the glass dust specifically includes following step
Suddenly：ZrO will be included2、Al2O3、SiO2、CaO、MgO、B2O3Frit powder it is well mixed in mass fraction ratio, then put
High melt is carried out in Muffle furnace, the glass melt after fusing is poured into quenching is carried out in deionized water, by obtained glass
Ball milling is carried out, is dried, sieving obtains glass dust；
The process regulation of the high melt process includes：Smelting temperature is 1600 DEG C~1800 DEG C, melting soaking time
For 1h~3h；The ball milling is carried out in zirconia ball grinding jar, using acetone as ball-milling medium, and ratio of grinding media to material is (2~3): 1, ball
Mill rotating speed is 380r/min~450r/min, and Ball-milling Time is 6h~12h；The sieving referred to the mesh sieve of 200 mesh~400；Institute
Stating glass dust and metal Ag, metal Pd is mixed in planetary gravity mixer, the technique of the planetary gravity mixer
Parameter includes：Revolution speed 1280rpm~1500rpm, rotational velocity is 30%~60%, 60~120min of mixing time.
9. the preparation method according to any one of claim 6~8, it is characterised in that the preparation of the coating is by glass
The compound of glass powder and metal Ag, metal Pd is mixed with organic carrier by three-roll grinder again, wherein the matter of compound
Amount fraction accounts for 75%~80%, and the mass fraction of organic carrier accounts for 25%~20%；
The organic carrier is mainly made up of ATBC, nitrocellulose and lecithin, and three is in organic carrier
Mass percent is respectively：
ATBC 70%~80%；
Nitrocellulose 2%~10%；
Lecithin 10%~20%；
The viscosity control of the coating prepared is 170~300Pas.
10. the preparation method according to any one of claim 6~8, it is characterised in that the sintering temperature during sintering
For 1000 DEG C~1050 DEG C, programming rate is 15 DEG C/min~20 DEG C/min, and sintering time is 10min~60min.
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| CN112095067B (en) * | 2020-08-25 | 2022-05-03 | 电子科技大学 | Preparation method of high-temperature-resistant infrared low-emissivity coating |
| CN114015992B (en) * | 2021-11-01 | 2022-05-20 | 重庆嘉陵特种装备有限公司 | High-temperature oxidation resistant heat-insulating coating suitable for titanium alloy surface and preparation method thereof |
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