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CN104911662B - Preparation method of composite ceramic coating layer - Google Patents

Preparation method of composite ceramic coating layer Download PDF

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CN104911662B
CN104911662B CN201510223610.2A CN201510223610A CN104911662B CN 104911662 B CN104911662 B CN 104911662B CN 201510223610 A CN201510223610 A CN 201510223610A CN 104911662 B CN104911662 B CN 104911662B
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aluminum alloy
alloy member
coating
preparation
positive
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CN104911662A (en
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吴护林
陈海涛
李忠盛
张隆平
易同斌
贾代金
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Southwest Institute of Technology and Engineering of China South Industries Group
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No 59 Research Institute of China Ordnance Industry
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Abstract

A preparation method of a composite ceramic coating layer includes successively pretreating the surface of an aluminum alloy element, preparing an arc-striking barrier layer on the surface of the aluminum alloy element, preparing a thermal insulation composite ceramic coating layer on the aluminum alloy surface and post-processing; the arc-striking barrier layer on the surface of the aluminum alloy element is prepared by coating in a deionized water-electrolysis solution system composed of NaOH, Na2SiO3, (NaPO3)6 and K2ZrF6; a preparation system of the aluminum alloy element surface coating layer is composed of a stainless steel solution tank (7), a tooling (4), the aluminum alloy element (5), a stirrer (2), a thermometer (6), a cooling water circulation heat-dissipation device (1) and a power source device (8). The composite ceramic coating layer prepared by the method and the system has the advantages of high toughness, strong binding force with the surface of the aluminum alloy element, long service life, and excellent heat insulation performance.

Description

A kind of preparation method of composite ceramic coat
The application is Application No. 201210143986.9, the division Shen of the patent of invention on the applying date 2012 year 05 month 10 Please.
Technical field
The present invention relates to prepare a kind of composite ceramics excellent with heat-proof quality on the working face of aluminum alloy spare part The method and its system of coating.
Background technology
Aluminium alloy as an alternative with the weight for mitigating parts industrially widely applied by the metal material such as steel And promotion, but there is the defects such as fusing point is low, heat transfer is fast, high temperature is oxidizable in aluminium alloy.Zirconium oxide is used as excellent heat insulating coat The attention of various countries is obtained, and has carried out substantial amounts of research, but due to the restriction of its own characteristic and preparation technology, prior art Mainly coating preparation, plasma spraying, physical vapour deposition (PVD) are carried out by technological means such as plasma spraying, physical vapour deposition (PVD)s All it is, in hydatogenesis to matrix surface, to be difficult to adopt because aluminum alloy materials characteristic is determined after oxidation zirconium melting etc. method Conventional method prepares zirconia ceramics coating on its surface.
Generally speaking, the existing preparation technology of zirconia ceramics coating has that coating binding force is not enough, easy embrittlement, therefore uses Life-span is not long, and the existing preparation technology such as technological means such as plasma spraying, electro beam physics vapour deposition is due to needing high temperature Fusing zirconium oxide re-evaporation deposits to workpiece substrate surface, therefore can only prepare on the materials with high melting point such as steel, composite surface and apply Layer, and crack because the difference of thermal coefficient of expansion between coating and matrix easily causes coating and is cooled in room temperature process, shadow Coating binding force is rung, application of the zirconium oxide on the light alloy material such as aluminium alloy surface is limited.
The content of the invention
It is an object of the invention to provide a kind of system with excellent thermal insulation performance, the composite ceramic coat of long service life Preparation Method.
The present invention seeks to be achieved through the following technical solutions:
A kind of preparation method of composite ceramic coat, it is characterised in that:It includes successively carrying out aluminum alloy member surface Pretreatment, preparation aluminum alloy member surface starting the arc barrier layer, the heat-insulated composite ceramic coat of preparation aluminum alloy surface and post processing;Institute The preparation for stating aluminum alloy member surface starting the arc barrier layer is with NaOH, Na2SiO3、(NaPO3)6、K2ZrF6The deionization of composition Carry out coating in water electrolysis liquid system, the coating be with aluminum alloy member frock be sandwiched in high-voltage dc pulse power anode, Aluminum alloy member frock is connected to the negative electrode of power supply, and coating prepares starting the arc barrier layer, wherein 3~5A/dm of current density2, frequency 800~1000Hz, the pulsewidth 30%~50% of positive pulse, 20~45min of process time;Preparing rising for aluminum alloy member surface After arc resistance barrier, the preparation of the heat-insulated composite ceramic coat of aluminum alloy surface is carried out, specifically there is the starting the arc to stop the surface The aluminum alloy member of layer is with NaOH, Na2SiO3、(NaPO3)6、Zr(NO3)4、Y(NO3)3、Al(NO3)3, and nanometer ZrO2With To carry out coating in the deionized water electrolyte system of constituent, the coating is to prepare to aqueous high-temperature-resistant inorganic binder The Al alloy parts for having starting the arc barrier layer are clamped in the negative electrode of high-voltage dc pulse power, and frock is connected to the anode of power supply, together When add it is positive and negative to voltage, wherein 5~8A/dm of current density2, 800~1200Hz of frequency, the pulsewidth of positive pulse takes 20%~ 50%, positive negative pulse stuffing compares 1:1、1:2 or 2:1,30~100min of process time.
In deionized water electrolyte system prepared by the heat-insulated composite ceramic coat of above-mentioned aluminum alloy surface, above-mentioned nanometer ZrO2 Preferably nanometer ZrO of particle diameter 20-40nm2, its addition is preferably 27-33g/L (more preferably 30g/L);In order to enter One step improves the resistance to elevated temperatures of final obtained coating, and above-mentioned aqueous high-temperature-resistant inorganic bond is preferably nano rare earth oxidation Thing composite water soluble inorganic binder, the oxide nano rare earth composite water soluble inorganic binder is added in aqueous high-temperature-resistant glue Enter lanthana, yittrium oxide that percentage by weight is 0.5%~1% or/and the obtained high temperature resistant of cerium oxide Jing bunchings reaction is combined Aqueous inorganic binding agent is commercially available prod (as Beijing will contains the oxide nano rare earth of prestige China Tech skill Development Co., Ltd production Aqueous high-temperature-resistant inorganic bond ZS-1071), its consumption is 31-33g/L (preferably 32g/L).
Above-mentioned each composition is commercially available prod;Obtained first by method made above is Al2O3Weight/mass percentage composition is 88%-95% is used as Al2O3Principal phase, ZrO2Weight/mass percentage composition is the aluminum alloy member surface starting the arc barrier layer of 5-12%, finally Obtained is ZrO2Weight/mass percentage composition is 75%-85% as ZrO2Principal phase, Y2O3Weight/mass percentage composition is 5-10%, Al2O3 Weight/mass percentage composition is the heat-insulated composite ceramic coat of aluminum alloy surface of 10-20%.
In the preparation on above-mentioned aluminum alloy member surface starting the arc barrier layer, its voltage is more preferably also controlled in 0~400V;On In stating the preparation of the heat-insulated composite ceramic coat of aluminum alloy surface, its generating positive and negative voltage ratio is more preferably also controlled for 3:1.
Specifically, a kind of preparation method of composite ceramic coat, it is characterised in that:It is included successively to aluminum alloy member Surface carries out pre-processing oil removing dedusting, prepares aluminum alloy member surface starting the arc barrier layer, prepares the heat-insulated composite ceramic of aluminum alloy surface Porcelain coating and post processing;
The preparation on the aluminum alloy member surface starting the arc barrier layer is with NaOH, Na2SiO3、(NaPO3)6、K2ZrF6Group Into deionized water electrolyte system in carry out coating, wherein NaOH 8g/L, Na2SiO3 20g/L、(NaPO3)6 10g/L、 K2ZrF625g/L, the coating is anode, the aluminum alloy member work for being sandwiched in high-voltage dc pulse power with aluminum alloy member frock Load is connected to the negative electrode of power supply and carries out coating preparation starting the arc barrier layer, wherein current density 4A/dm2, frequency 950Hz, positive pulse Pulsewidth 40%, process time 33min, voltage is in 0~400V;
Behind the starting the arc barrier layer for preparing aluminum alloy member surface, the system of the heat-insulated composite ceramic coat of aluminum alloy surface is carried out It is standby, specifically the surface is had into the aluminum alloy member on starting the arc barrier layer with NaOH, Na2SiO3、(NaPO3)6、Zr (NO3)4、Y(NO3)3、Al(NO3)3, and nanometer ZrO2It is to constitute into oxide nano rare earth composite water soluble inorganic binder Coating, wherein NaOH 6g/L, Na are carried out in the deionized water electrolyte system for dividing2SiO3 16g/L、(NaPO3)6 8g/L、Zr (NO3)4 20g/L、Y(NO3)3 8g/L、Al(NO3)310g/L, nanometer ZrO2For nanometer ZrO of particle diameter 20-40nm2, its Addition is 30g/L;Oxide nano rare earth composite water soluble inorganic binder is that lanthana, yittrium oxide or/and cerium oxide Jing gather The obtained high temperature resistant composite water soluble inorganic adhesive of contracting reaction, is commercially available prod, and its consumption is 32g/L;The coating is to make The Al alloy parts for having starting the arc barrier layer are clamped in the negative electrode of high-voltage dc pulse power, and frock is connected to the anode of power supply, Add simultaneously positive and negative to voltage, wherein current density 6A/dm2, frequency 1000Hz, the pulsewidth of positive pulse takes 40%, positive negative pulse stuffing Than 1:2, generating positive and negative voltage compares 3:1, process time 75min.
Most specifically say that a kind of preparation method of composite ceramic coat is carried out according to the following steps:
A. the pretreatment on aluminum alloy member surface:
Aluminum alloy member is carried out into dedusting, oil removing cleaning using ultrasonic washing instrument, then using H3PO4With Al (OH)3Instead Should, the aqueous solution treatment fluid of biphosphate Alumina gel is obtained, aluminum alloy member is immersed into 2~3min in the solution, to remove aluminium The oxide skin of alloy surface, deionized water cleaning after process, then aluminum alloy member immersion 10~20g/LNaOH solution is carried out Surface alkali cleaning and Passivation Treatment at least 5 minutes;
B. the preparation on aluminum alloy member surface starting the arc barrier layer
The preparation on the aluminum alloy member surface starting the arc barrier layer is with NaOH, Na2SiO3、(NaPO3)6、K2ZrF6Group Into deionized water electrolyte system in carry out coating, wherein NaOH 8g/L, Na2SiO3 20g/L、(NaPO3)6 10g/L、 K2ZrF625g/L, the coating is anode, the aluminum alloy member work for being sandwiched in high-voltage dc pulse power with aluminum alloy member frock Load is connected to the negative electrode of power supply and carries out coating preparation starting the arc barrier layer, and negative voltage, wherein electric current are added without in coating preparation process Density 4A/dm2, frequency 950Hz, the pulsewidth 40% of positive pulse, process time 33min, voltage is in 0~400V;By above-mentioned steps Obtain Al2O3Weight/mass percentage composition is 95% Al2O3Principal phase, ZrO2Weight/mass percentage composition is that 5% aluminum alloy member surface is risen Arc resistance barrier;
C. the preparation of the heat-insulated composite ceramic coat of aluminum alloy surface
Behind the starting the arc barrier layer for preparing aluminum alloy member surface, the system of the heat-insulated composite ceramic coat of aluminum alloy surface is carried out It is standby, specifically the surface is had into the aluminum alloy member on starting the arc barrier layer with NaOH, Na2SiO3、(NaPO3)6、Zr (NO3)4、Y(NO3)3、Al(NO3)3, and nanometer ZrO2It is to constitute into oxide nano rare earth composite water soluble inorganic binder Coating, wherein NaOH 6g/L, Na are carried out in the deionized water electrolyte system for dividing2SiO3 16g/L、(NaPO3)6 8g/L、Zr (NO3)4 20g/L、Y(NO3)3 8g/L、Al(NO3)310g/L, nanometer ZrO2For nanometer ZrO of particle diameter 20-40nm2, its Addition is 30g/L;Oxide nano rare earth composite water soluble inorganic binder is that lanthana, yittrium oxide or/and cerium oxide Jing gather The obtained high temperature resistant composite water soluble inorganic adhesive of contracting reaction, is commercially available prod, and its consumption is 32g/L;The coating is to make The Al alloy parts for having starting the arc barrier layer are clamped in the negative electrode of high-voltage dc pulse power, and frock is connected to the anode of power supply, Add simultaneously positive and negative to voltage, wherein current density 6A/dm2, frequency 1000Hz, the pulsewidth of positive pulse takes 40%, positive negative pulse stuffing Than 1:2, generating positive and negative voltage compares 3:1, process time 75min, 0~560V of positive voltage, 0~300V of negative voltage;Obtain by above-mentioned steps ZrO2Weight/mass percentage composition is the ZrO of 75%-85%2Principal phase, Y2O3Weight/mass percentage composition is 5-10%, Al2O3Quality percentage contains Measure the heat-insulated composite ceramic coat of aluminum alloy surface for 10-20%;
Chemical composition in above two electrolyte system preferably adopts AR, prepares using deionized water as molten Agent, quality of de-ionized water require 25 DEG C of preferred 10M Ω cm@and more than, the distilled water of high-purity (three distillations and more than) can Preferably to replace deionized water as solvent, alcohol adopt purity for the analysis of 99.7% and the above it is pure;
D. post-process
The aluminum alloy member of the tool coating Jing after the process of step c is cleaned, then will have coating aluminium using hair dryer Alloying element is dried up;
Preferably, in order to obtain further improving obtained aluminum alloy member resistance to elevated temperatures, after above-mentioned post processing Also sealing pores are carried out to having coating aluminum alloy member, specifically using ZrO2Modified organosilicon phenolic resin (is commercially available product Product) even application is carried out to coating aluminum alloy member.
The present invention has following beneficial effect:
Aluminum alloy member face coat obtained in preparation method of the present invention is ZrO2-Y2O3-Al2O3Heat-insulated composite ceramics is applied Layer;Present invention utilizes there is c-ZrO in zirconium oxide2→t-ZrO2(2370 DEG C) and t-ZrO2(2370℃)→M-ZrO2(1170 DEG C) phase-change characteristic, introducing aluminum oxide, yttrium composition makes the c-ZrO of high-temperature stable2And t-ZrO2Mutually also can be in room Temperature is stable or meta-stable is present, and toughening effect is served to zirconia coating, further to improve zirconia coating in aluminium alloy The adhesion on surface;Meanwhile, the excellent high-temperature behavior of aluminum oxide, yittrium oxide forms reinforcement and makees to the heat-proof quality of zirconia coating With further increasing coating heat-proof quality.The composite ceramic coat is mainly by oxides such as zirconium oxide, yittrium oxide, aluminum oxide Ceramic phase composition, forms with zirconium oxide as principal phase, aluminum oxide, the composite coating structure of yttria toughened, the oxidation of non-master phase constituent Aluminium, yittrium oxide have the stable effect of toughness reinforcing and phase structure to principal phase zirconium oxide, and the zirconic fusing point of principal phase is 2677 DEG C, heat conduction Rate is 0.92wmK-1, thermal coefficient of expansion is 10 × 10-6·℃-1, with fusing point it is high, high-temperature heat-conductive rate is low, thermal coefficient of expansion The characteristic such as close with aluminum substrate.
Obtained aluminum alloy member face coat of the invention has high tenacity and aluminum alloy member surface adhesion strong, real Test result to show coating layer thickness adhesion is in 7.5Mpa-10Mpa in 350um or so, its long service life, heat-proof quality is excellent It is different.Inventor by long-term theoretical research and substantial amounts of test, solve aluminum alloy member cannot low temperature preparation go out zirconium oxide For the composite ceramic coat of principal phase, it is difficult to meet 2000 DEG C of high temperature above use requirement in short-term, improve aluminum alloy member Heat-proof quality, realizes reliability and uses 10s-30s under obtained hot environment of the aluminum alloy member more than 2000 DEG C of the present invention; The inventive method is applicable not only to small-sized aluminum alloy member, is also applied for large aluminum alloy parts;It is applicable not only to circle, side The aluminum alloy member of the regular shapes such as shape, is also applied for the aluminum alloy member of the arbitrary shapes such as ellipse, flat.Aluminium of the present invention is closed The preparation system of gold dollar part face coat is simple, workable, is easy to industrialization promotion.
Description of the drawings
Fig. 1:The ZrO obtained in embodiment 12-Y2O3-Al2O3Composite ceramic coat surface microscopic topographic figure;
Fig. 2:The ZrO obtained in embodiment 12-Y2O3-Al2O3Composite ceramic coat section microscopic appearance figure;
Fig. 3:The ZrO obtained in embodiment 12-Y2O3-Al2O3Composite ceramic coat EDAX results figure;
Fig. 4:For composite ceramic coat preparation system structural representation of the present invention;Wherein, 1- cooling water circulations heat abstractor, 2- agitators, 3- electrolyte, 4- frocks, 5- aluminum alloy members, 6- thermometers, 7- stainless steel solution tanks, 8- power-supply devices;
Fig. 5:The impulse waveform of the power supply output on aluminum alloy member surface starting the arc barrier layer, wherein T are prepared for embodiment 1: Cycle, f:Pulsewidth;
Fig. 6:The impulse waveform of the power supply output of the heat-insulated composite ceramic coat of aluminum alloy surface is prepared for embodiment 1, wherein T:Cycle, f:Pulsewidth;
Fig. 7:For the main circuit schematic diagram of power-supply device in composite ceramic coat preparation system of the present invention.
Specific embodiment
The present invention is specifically described below by example, it is necessary to it is pointed out here that, following instance is served only for right The present invention is further described, it is impossible to be interpreted as limiting the scope of the invention, and the person skilled in the art in the field can So that some nonessential modifications and adaptations are made to the present invention according to foregoing invention content.
Embodiment 1
A kind of preparation system of composite ceramic coat, as shown in figure 4, by stainless steel solution tank 7, frock 4, aluminum alloy member 5th, agitator 2, thermometer 6, cooling water circulation heat abstractor 1 and power-supply device 8 are constituted, and are wherein filled in stainless steel solution tank 7 Thermometer 6, agitator 2, frock 4 and aluminum alloy member 5 are provided with above-mentioned electrolyte 3, stainless steel solution tank 7, and are soaked In the electrolyte 3, wherein aluminum alloy member 5 is arranged in frock 4, the positive and negative electrode and aluminum alloy member 5 of power-supply device 8, Frock 4 connects respectively;The cooling water circulation heat abstractor 1 is arranged on the bottom of stainless steel solution tank 7 by pipeline and stainless steel Solution tank 7 is connected;Wherein power-supply device 8 is commercially available prod, and its main circuit schematic diagram is referring to Fig. 7.
Composite ceramic coat is prepared using the system, is carried out according to the following steps:
(1) preparation of high-voltage dc pulse power and aluminum alloy member frock:Using generating positive and negative voltage it is symmetrical, generating positive and negative voltage can Tune, positive negative pulse stuffing are than adjustable and positive negative pulse stuffing pulsewidth, the high-voltage direct-current pulse power of frequency-adjustable;Generating positive and negative voltage is all in 700V More than, generating positive and negative voltage can smooth adjustable between 0~700V, and positive negative pulse stuffing ratio can carry out 1:2、2:1、1:1 Three models are adjustable, Positive negative pulse stuffing width can be adjustable between 0~100%, and the frequency of positive negative pulse stuffing can be adjustable between 300Hz~3000Hz, the electricity The supporting electrolytic bath in source has cooling capacity, it is ensured that solution temperature is maintained at less than 30 DEG C in experimentation;And for aluminium alloy The aluminum alloy member frock that the Structural Feature Design of element goes out required for prepared by coating, the frock is simultaneously as the another of coating preparation An outer electrode, therefore the frock needs firm clamping aluminum alloy member and with excellent electric conductivity, additionally needs and aluminium alloy The process face of element prepares coating be in matching relationship, it is ensured that the field uniformity between frock and aluminium alloy, frock preferably with With aluminum alloy member identical material, to ensure the symmetry between frock and aluminum alloy member;Using granularity more than 600 mesh Sand paper frock is polished, make wear surface surface roughness in Ra more than 0.47;
(2) pretreatment on aluminum alloy member surface:
Aluminum alloy member is carried out into dedusting, oil removing cleaning using ultrasonic washing instrument, then using H3PO4With Al (OH)3Instead Should, the aqueous solution treatment fluid of biphosphate Alumina gel is obtained, aluminum alloy member is immersed into 2~3min in the solution, to remove aluminium The oxide skin of alloy surface, deionized water cleaning after process, then aluminum alloy member immersion 10~20g/LNaOH solution is carried out Surface alkali cleaning and Passivation Treatment at least 5 minutes;
(3) preparation on aluminum alloy member surface starting the arc barrier layer
The preparation on the aluminum alloy member surface starting the arc barrier layer is with NaOH, Na2SiO3、(NaPO3)6、K2ZrF6Group Into deionized water electrolyte system in carry out coating, wherein NaOH 8g/L, Na2SiO3 20g/L、(NaPO3)6 10g/L、 K2ZrF625g/L, the coating is anode, the aluminum alloy member work for being sandwiched in high-voltage dc pulse power with aluminum alloy member frock Load is connected to the negative electrode of power supply and carries out coating preparation starting the arc barrier layer, and negative voltage, wherein electric current are added without in coating preparation process Density 4A/dm2, frequency 950Hz, the pulsewidth 40% of positive pulse, process time 33min;The power supply output that its power-supply device is used Impulse waveform as shown in Figure 5.Al is obtained by above-mentioned steps2O3Weight/mass percentage composition is 95% Al2O3Principal phase, ZrO2Quality hundred Point content is 5% aluminum alloy member surface starting the arc barrier layer;
(4) preparation of the heat-insulated composite ceramic coat of aluminum alloy surface
Behind the starting the arc barrier layer for preparing aluminum alloy member surface, the system of the heat-insulated composite ceramic coat of aluminum alloy surface is carried out It is standby, specifically the surface is had into the aluminum alloy member on starting the arc barrier layer with NaOH, Na2SiO3、(NaPO3)6、Zr (NO3)4、Y(NO3)3、Al(NO3)3, and nanometer ZrO2It is to constitute into oxide nano rare earth composite water soluble inorganic binder Coating, wherein NaOH 6g/L, Na are carried out in the deionized water electrolyte system for dividing2SiO3 16g/L、(NaPO3)6 8g/L、Zr (NO3)4 20g/L、Y(NO3)3 8g/L、Al(NO3)310g/L, nanometer ZrO2For nanometer ZrO of particle diameter 20-40nm2, its Addition is 30g/L;Oxide nano rare earth composite water soluble inorganic binder is that lanthana, yittrium oxide or/and cerium oxide Jing gather The obtained high temperature resistant composite water soluble inorganic adhesive of contracting reaction, is commercially available prod, and its consumption is 32g/L;The coating is to make The Al alloy parts for having starting the arc barrier layer are clamped in the negative electrode of high-voltage dc pulse power, and frock is connected to the anode of power supply, Add simultaneously positive and negative to voltage, wherein current density 6A/dm2, frequency 1000Hz, the pulsewidth of positive pulse takes 40%, positive negative pulse stuffing Than 1:1, generating positive and negative voltage compares 3:1, process time 75min;The impulse waveform of the power supply output that its power-supply device is used is shown in Fig. 6 institutes Show.
Chemical composition in above two electrolyte system adopts AR, prepares using deionized water as solvent, Quality of de-ionized water requires the distilled water of 25 DEG C of preferred 10M Ω cm@and the above or high-purity (three distillations and more than), alcohol Adopt purity for the analysis of 99.7% and the above it is pure;
(5) post-process
The aluminum alloy member of the tool coating Jing after the process of step c is cleaned, then will have coating aluminium using hair dryer Alloying element is dried up;Also sealing pores are carried out to having coating aluminum alloy member after above-mentioned post processing, specifically using ZrO2Change Property organosilicon phenolic resin (be commercially available prod) even application is carried out to coating aluminum alloy member, and in 160~180 DEG C of temperature In the range of to organosilicon phenolic resin carry out solidify 5h and more than.
Aluminum alloy member face coat obtained above has high tenacity and the strong (employing of aluminum alloy member surface adhesion The circular specimen of band coating pulls open method test adhesion).Using GJB323A-1996《Ablator ablative test method》Test The sample heat-proof quality of band coating:Reliability is realized under 2200-2500 DEG C of hot environment and uses 20s-24s, fully met Aluminum alloy member use requirement in short-term at high temperature.Its obtained ZrO2-Y2O3-Al2O3Composite ceramic coat is referring to Fig. 1, figure 2nd, shown in Fig. 3.
Embodiment 2,3:Carry out by following raw material and technological parameter, remaining is with embodiment 1.
Composite ceramic coat obtained above has high tenacity and aluminum alloy member surface adhesion strong, in 2000-3000 DEG C hot environment under realize it is reliable use 15s-28s, meet its use requirement in high temperature environments.

Claims (1)

1. a kind of preparation method of composite ceramic coat, it is characterised in that carry out according to the following steps:
The preparation system that the coating is adopted, by stainless steel solution tank(7), frock(4), aluminum alloy member(5), agitator(2)、 Thermometer(6), cooling water circulation heat abstractor(1)And power-supply device(8)Composition, wherein stainless steel solution tank(7)Inside fill electricity Solution liquid(3), stainless steel solution tank(7)Inside it is provided with thermometer(6), agitator(2), frock(4)And aluminum alloy member(5), and And it is immersed in the electrolyte(3)In, wherein aluminum alloy member(5)It is arranged on frock(4)It is interior, power-supply device(8)Positive and negative electrode With aluminum alloy member(5), frock(4)Connect respectively;The cooling water circulation heat abstractor(1)It is arranged on stainless steel solution tank (7)Bottom is by pipeline and stainless steel solution tank(7)Connection;
A. the preparation of high-voltage dc pulse power and aluminum alloy member frock:Using generating positive and negative voltage it is symmetrical, generating positive and negative voltage is adjustable, Positive negative pulse stuffing is than adjustable and positive negative pulse stuffing pulsewidth, the high-voltage direct-current pulse power of frequency-adjustable;Generating positive and negative voltage all 700 V with On, generating positive and negative voltage is smooth adjustable between 0 ~ 700 V, and positive negative pulse stuffing ratio carries out 1:2、2:1、1:1 Three models are adjustable, positive and negative arteries and veins Rush that width is adjustable between 0 ~ 100%, the frequency of positive negative pulse stuffing is adjustable between 300 Hz ~ 3000 Hz, the supporting electricity of the power supply Solution liquid bath has cooling capacity, it is ensured that solution temperature is maintained at less than 30 DEG C in experimentation;And for the structure of aluminum alloy member The aluminum alloy member frock that characteristics design goes out required for prepared by coating, another electricity that the frock is prepared as coating simultaneously Pole;
B. the pretreatment on aluminum alloy member surface:
Aluminum alloy member is carried out into dedusting, oil removing cleaning using ultrasonic washing instrument, then using H3PO4With Al (OH)3Reaction, obtains To the aqueous solution treatment fluid of biphosphate Alumina gel, aluminum alloy member is immersed into 2~3 min in the solution, to remove aluminium alloy The oxide skin on surface, deionized water cleaning after process, then the NaOH solution that aluminum alloy member immerses 10~20 g/L is carried out Surface alkali cleaning and Passivation Treatment at least 5 minutes;
C. the preparation on aluminum alloy member surface starting the arc barrier layer
The preparation on the aluminum alloy member surface starting the arc barrier layer is with NaOH, Na2SiO3、(NaPO3)6、K2ZrF6Composition Coating, wherein NaOH 10 g/L, Na are carried out in deionized water electrolyte system2SiO3 18 g/L、(NaPO3)6 13 g/L、 K2ZrF627g/L, the coating is anode, the aluminum alloy member work for being sandwiched in high-voltage dc pulse power with aluminum alloy member frock Load is connected to the negative electrode of power supply and carries out coating preparation starting the arc barrier layer, and negative voltage, wherein electric current are added without in coating preparation process Density 3A/dm2, voltage 200V, the Hz of frequency 1000, the pulsewidth 50% of positive pulse, the min of process time 25;
D. the preparation of the heat-insulated composite ceramic coat of aluminum alloy surface
Behind the starting the arc barrier layer for preparing aluminum alloy member surface, the preparation of the heat-insulated composite ceramic coat of aluminum alloy surface is carried out, Specifically the surface had into the aluminum alloy member on starting the arc barrier layer with NaOH, Na2SiO3、(NaPO3)6、 Zr(NO3)4、Y (NO3)3、Al(NO3)3, and nanometer ZrO2With oxide nano rare earth composite water soluble inorganic binder for constituent go from Coating, wherein NaOH 6 g/L, Na are carried out in sub- water electrolysis liquid system2SiO3 17 g/L、(NaPO3)6 5 g/L、Zr(NO3)4 17 g/L、Y(NO3)3 9g/L、Al(NO3)39 g/L, nanometer ZrO2For nanometer ZrO of particle diameter 20-40nm2, its addition For 27g/L;Oxide nano rare earth composite water soluble inorganic binder is the reaction of lanthana, yittrium oxide or/and cerium oxide Jing bunchings Obtained high temperature resistant composite water soluble inorganic adhesive, its consumption is 33g/L;The coating is will to prepare the aluminium for having starting the arc barrier layer Alloy workpiece is clamped in the negative electrode of high-voltage dc pulse power, and frock is connected to the anode of power supply, while adding positive and negative to electricity Pressure, wherein current density 5A/dm2, positive voltage 560V, negative voltage 200V, frequency 1200Hz, the pulsewidth of positive pulse takes 50%, just Negative pulse compares 2:1, process time 80min;
E. post-process
The aluminum alloy member of the tool coating Jing after the process of step d is cleaned, then will have coating aluminium alloy using hair dryer Element is dried up;Also sealing pores are carried out to having coating aluminum alloy member, specifically using ZrO2Modified organosilicon phenolic resin Even application is carried out to coating aluminum alloy member, and organosilicon phenolic resin is solidified in 160 ~ 180 DEG C of temperature ranges 5h and more than.
CN201510223610.2A 2012-05-10 2012-05-10 Preparation method of composite ceramic coating layer Active CN104911662B (en)

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