CN106116702A - A kind of Cfthe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating - Google Patents

A kind of Cfthe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating Download PDF

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CN106116702A
CN106116702A CN201610478925.6A CN201610478925A CN106116702A CN 106116702 A CN106116702 A CN 106116702A CN 201610478925 A CN201610478925 A CN 201610478925A CN 106116702 A CN106116702 A CN 106116702A
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powder
lamgal
thermal barrier
sic
composite material
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邹兵林
王盈
蔡晓龙
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Changchun Institute of Applied Chemistry of CAS
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Changchun Institute of Applied Chemistry of CAS
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Abstract

The present invention provides a kind of CfThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, belongs to field of compound material.Solve existing at CfThe process complex process of coating is prepared on/SiC ceramic matrix composite material surface, the problem that the coating obtained is high temperature resistant and oxygen oozes diffusion difference.The method is first to use solid reaction process synthesis Re2Si2O7And LaMgAl11O19Powder, synthetic powder prepares C after the pre-treatment by APS technology after mist projection granulatingfRe is sprayed successively in/SiC matrix2Si2O7Ceramic layer and LaMgAl11O19Ceramic layer, obtains Cf/ SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating.Double ceramic layer thermal barrier coatings prepared by the present invention have good high high-temp stability, lower thermal conductivity, good anti-caking power, are suitable as the high-temperature hot protective hot barrier coating of hot junction component.

Description

A kind of CfThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating
Technical field
The invention belongs to field of compound material, be specifically related to a kind of Cf/ SiC ceramic matrix composite material surface high-temp antioxidation thermal boundary is coated with The preparation method of layer.
Background technology
Ceramic Matrix Composites Reinforced by Carbon Fibers (Cf/ SiC) there is high intensity, high rigidity, high heat conductance and low The advantages such as density, are one of candidate materials having application prospect most on Aeronautics and Astronautics, weaponry hot junction component.But, Cf/ SiC easily aoxidizes in high-temperature oxidation environment, greatly limit its application in high-temperature oxidation environment.At Cf/ surface of SiC system Standby ORC can be effectively improved its high-temperature oxidation resistance.
Patent CN 101353269A discloses that a kind of to use investment to prepare Zr-Si-C at C/SiC composite material surface resistance to The method of high temperature coating, coating is generated by reaction between refractory metal powder body and matrix, but the method is not suitable on a large scale Industrialized production, and the high temperature resistant and oxygen of coating to ooze diffusion not good enough.Patent CN 1718560A discloses one and exists Cf/ SiC ceramic matrix composite material surface use chemical vapour deposition technique, mud coating sintering method prepare SiC adhesive linkage, self-healing layer and The ORC of SiC erosion resistance layer three-decker, but the method preparation technology of coating is complicated, the longest, and use temperature not More than 1300 DEG C.
Summary of the invention
The invention aims to solve existing at CfThe process work of coating is prepared on/SiC ceramic matrix composite material surface Skill is complicated, and the coating obtained is high temperature resistant and oxygen oozes the problem that diffusion is poor, and provides a kind of Cf/ SiC ceramic matrix composite material surface The preparation method of high-temperature oxidation resistant thermal barrier coating.
The present invention provides a kind of CfThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, the method bag Include:
Step one: prepare Re respectively2Si2O7Powder and LaMgAl11O19Powder, Re is rare earth element, selected from Y, Er or Yb In one；
Step 2: the Re that step one is obtained2Si2O7Powder and LaMgAl11O19Powder respectively with deionized water, citric acid Ammonium, arabic gum mix, and obtain Re2Si2O7Slurry and LaMgAl11O19Slurry, by Re2Si2O7Slurry and LaMgAl11O19Slurry Carry out ball milling respectively, sieve and pelletize, obtain Re2Si2O7Dusty spray and LaMgAl11O19Dusty spray；
Step 3: by Cf/ SiC matrix carries out pretreatment, obtains pretreated Cf/ SiC matrix；
Step 4: use APS technology to prepare coating, Re step 2 obtained2Si2O7Dusty spray and LaMgAl11O19 Dusty spray is respectively put in plasma gun, at the pretreated C that step 3 obtainsfSpray successively in/SiC matrix Re2Si2O7Ceramic layer and LaMgAl11O19Ceramic layer, obtains Cf/ SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating.
Preferably, described preparation Re2Si2O7Powder particularly as follows:
By Re2O3Powder and SiO2Powder mixes, and adds water and zirconia ball, ball on ball mill in mixed-powder Mill 6～12h, the slurry drying that obtains, centrifugal ball milling, sieves, and obtains product and reacts 6～12h at 1400～1500 DEG C, obtains Re2Si2O7Powder.
Preferably, described Re2O3Powder and SiO2The mol ratio of powder is 1:2.
Preferably, described preparation LaMgAl11O19Powder particularly as follows:
Lanthanum oxide powder, alumina powder and magnesium oxide powder are mixed, in mixed-powder, adds water and zirconium oxide is little Ball, ball milling 6～12h on ball mill, the slurry drying obtained, centrifugal ball milling, sieve, obtain product at 1550～1650 DEG C Reaction 6～12h, obtains LaMgAl11O19Powder.
Preferably, the mol ratio of described lanthanum oxide powder, alumina powder and magnesium oxide powder is 1:11:2.
Preferably, described Re2Si2O7The mass ratio of powder, deionized water, ammonium citrate and arabic gum is 100: (100-150): (0.4-0.8): (1-2)；LaMgAl11O19The mass ratio of powder, deionized water, ammonium citrate and arabic gum For 100:(100-150): (0.4-0.8): (1-2).
Preferably, the Ball-milling Time of described step 2 is 48～72h.
Preferably, the preprocessing process of described step 3 is: by Cf/ SiC matrix surface emergy carries out sandblasting Process, then by Cf/ SiC matrix with ethanol purge, obtains pretreated C in ultrasonic cleaner after dryingf/ SiC base Body.
Preferably, in described step 4 spraying process, spraying current is 500～700A, and spray power is 30～40k W, plasma gas is argon and hydrogen, and wherein argon flow amount is 30～40SLPM, and hydrogen flowing quantity is 10～20SLPM, spray away from From for 90～110mm.
Preferably, described step 4 sprays Re2Si2O7The thickness of ceramic layer is 40～120 μm, LaMgAl11O19 The thickness of ceramic layer is 40～120 μm.
Beneficial effects of the present invention
The present invention provides a kind of CfThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, the method is First use solid reaction process synthesis Re2Si2O7And LaMgAl11O19Powder, synthetic powder passes through APS technology system after mist projection granulating Standby Re2Si2O7/LaMgAl11O19Coating, sprays outer layer after first spraying internal layer and form composite coating in the preparation process of coating.Described Raw material Re2Si2O7The thermal coefficient of expansion of (Re is rare earth element) and Cf/ SiC substrate has good matching, and has height Non-oxidizability, low oxygen permeability, thermal coefficient of expansion is between LaMgAl11O19And CfBetween/SiC.Therefore by Re2Si2O7As interior Ceramic layer and LaMgAl11O19As outer ceramic layer, efficiently solve coating and matrix because of thermal expansion do not mate, poor bonding strength And the problem come off, and use temperature to be up to 1400 DEG C, compared with prior art, atmospheric plasma spraying technology (APS) is permissible Being melted by high-melting-point ceramic material, and the composition of coating material, ratio can freely regulate, matrix material is damaged by spraying process Degree is relatively low, and double ceramic layer thermal barrier coatings prepared by the present invention have good high high-temp stability, lower thermal conductivity, good anti- Caking power, is suitable as the high-temperature hot protective hot barrier coating of hot junction component.
Accompanying drawing explanation
Fig. 1 is ceramic layer Y in the thermal barrier coating that the embodiment of the present invention 1 prepares2Si2O7XRD figure；
Fig. 2 is ceramic layer Er in the thermal barrier coating that the embodiment of the present invention 2 prepares2Si2O7XRD figure；
Fig. 3 is ceramic layer Yb in the thermal barrier coating that the embodiment of the present invention 3 prepares2Si2O7XRD figure；
Fig. 4 is the outer ceramic layer LaMgAl of thermal barrier coating that the embodiment of the present invention 1 prepares11O19XRD figure；
Fig. 5 is the electron scanning micrograph of the thermal barrier coating that the embodiment of the present invention 1 prepares；
Fig. 6 is the electron scanning micrograph of the thermal barrier coating that the embodiment of the present invention 2 prepares；
Fig. 7 is the electron scanning micrograph of the thermal barrier coating that the embodiment of the present invention 3 prepares.
Detailed description of the invention
The present invention provides a kind of CfThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, the method bag Include:
Step one: prepare Re respectively2Si2O7Powder and LaMgAl11O19Powder, Re is rare earth element, selected from Y, Er or Yb In one；
Step 2: the Re that step one is obtained2Si2O7Powder and LaMgAl11O19Powder respectively with deionized water, citric acid Ammonium, arabic gum mix, and obtain Re2Si2O7Slurry and LaMgAl11O19Slurry, by Re2Si2O7Slurry and LaMgAl11O19Slurry Carry out ball milling respectively, sieve and pelletize, obtain Re2Si2O7Dusty spray and LaMgAl11O19Dusty spray；
Step 3: by Cf/ SiC matrix carries out pretreatment, obtains pretreated Cf/ SiC matrix；
Step 4: use APS technology prepare coating, upper step 2 is obtained Re2Si2O7Dusty spray and LaMgAl11O19Dusty spray is respectively put in plasma gun, at the pretreated C that step 3 obtainsfDepend on in/SiC matrix Secondary spraying Re2Si2O7Ceramic layer and LaMgAl11O19Ceramic layer, obtains Cf/ SiC ceramic matrix composite material surface high-temp antioxidation thermal boundary is coated with Layer.
According to the present invention, prepare Re the most respectively2Si2O7Powder and LaMgAl11O19Powder, described preparation Re2Si2O7Powder Preferably particularly as follows:
By Re2O3Powder and SiO2Powder mixes, and adds water and the oxidation of different-diameter (1～15mm) in mixed-powder Zirconium bead, ball milling 6～12h on ball mill, the slurry drying obtained, centrifugal ball milling 5～30min, excessively 60 μm sieves, produced Thing, at 1400～1500 DEG C of high temperature solid state reactions 6～12h, obtains Re2Si2O7Powder, described Re2O3Powder and SiO2Powder Mol ratio is preferably 1:2.Re is rare earth element, the one in Y, Er or Yb；
Described preparation LaMgAl11O19Powder preferably particularly as follows:
By lanthana (La2O3) powder, aluminium oxide (Al2O3) powder and magnesium oxide (MgO) powder mixing, to mixed-powder Middle addition water and the zirconia ball of different-diameter (1～15mm), ball milling 6～12h on ball mill, the slurry obtained is through drying Ball milling 5～30min dry, centrifugal, cross 60 μm sieves, obtain product at 1550～1650 DEG C of high temperature solid state reactions 6～12h, obtain LaMgAl11O19Powder；The mol ratio of described lanthanum oxide powder, alumina powder and magnesium oxide powder is preferably 1:11:2.
According to the present invention, the Re that will obtain2Si2O7Powder and LaMgAl11O19Powder respectively with deionized water, citric acid Ammonium, arabic gum mix, and obtain Re2Si2O7Slurry and LaMgAl11O19Slurry, by Re2Si2O7Slurry and LaMgAl11O19Slurry Carrying out ball milling respectively, Ball-milling Time is preferably 48～72h, crosses 120 μm sieves, and the spray of 100～125 DEG C sent into by the slurry after sieving Carrying out mist projection granulating in mist drying instrument, to obtain the spherical powder of good fluidity, spray-dried powders is through bolting, choosing Take mist projection granulating powder that particle size is 32～100 μm as APS dusty spray.Described Re2Si2O7Powder, deionization The mass ratio of water, ammonium citrate and arabic gum is preferably 100:(100-150): (0.4-0.8): (1-2), more preferably 100: (100-120): (0.5-0.7): (1-2)；LaMgAl11O19The mass ratio of powder, deionized water, ammonium citrate and arabic gum It is preferably 100:(100-150): (0.4-0.8): (1-2), more preferably 100:(100-120): (0.5-0.7): (1-2).
According to the present invention, described Cf/ SiC matrix is pretreatment to be carried out before spraying, so that the coating result of spraying reaches To optimal, meeting the job demand under high temperature oxidative atmosphere, the process of pretreatment is particularly as follows: by Cf/ SiC matrix surface granularity It is the emergy (Al of 36 mesh2O3) carrying out blasting treatment, described blast time is preferably 2～5 seconds, makes matrix surface be roughened, and rises To the effect promoting anchoring strength of coating；After blasting treatment, by Cf/ SiC matrix with ethanol purge, is gone in ultrasonic cleaner Degrease and the fine particle impurity of remained on surface, after natural air drying, put into drying baker dry for standby.
According to the present invention, APS technology is used to prepare coating, by Re obtained above2Si2O7Dusty spray and LaMgAl11O19Dusty spray is respectively put in plasma gun, C the most after the pre-treatmentfRe is sprayed in/SiC matrix2Si2O7 Ceramic layer, thickness is preferably 40～120 μm, more preferably 60～116 μm, then sprays LaMgAl11O19Ceramic layer, thickness is preferred It is 40～120 μm, more preferably 65～103 μm, obtain Cf/ SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating.
According to the present invention, in described spraying process, spraying current is 500～700A, and spray power is 30～40kW, etc. Ionized gas is argon (Ar2) and hydrogen (H2), wherein argon flow amount is 30～40SLPM, and hydrogen flowing quantity is 10～20SLPM, spray Being coated with distance is 90～110mm.
According to the present invention, there are six lanthanum-magnesium aluminate (LaMgAl of magnetoplumbite type11O19) it is that one has high-melting-point, high Anti-sintering and the ceramic with heat resistance of oxygen diffusion, but its thermal coefficient of expansion is about 9.1ppm/ DEG C, and CfThe heat of/SiC matrix The coefficient of expansion is 2.64ppm/ DEG C, the thermal expansion not matching degree that both existence are bigger.Rare earth silicate especially Re2Si2O7(Re For rare earth element) thermal coefficient of expansion and Cf/ SiC substrate has good matching, and has high antioxidant, hypoxia air infiltration Rate thoroughly, thermal coefficient of expansion is between LaMgAl11O19And CfBetween/SiC.Therefore novel Re is designed2Si2O7/LaMgAl11O19Double potteries Rotating fields oxidation-inhibited thermal barrier coating, i.e. Re2Si2O7As interior ceramic layer and LaMgAl11O19As outer ceramic layer, efficiently solve Coating and matrix because of thermal expansion do not mate, poor bonding strength and the problem that comes off, and use temperature to be up to 1400 DEG C.It is coated with other Layer preparation method is compared, and high-melting-point ceramic material can be melted by atmospheric plasma spraying technology (APS), and the one-tenth of coating material Divide, ratio can freely regulate, and spraying process is relatively low to the matrix material extent of damage, is very suitable for high-melting-point ceramic coating Preparation and industrialization large-scale production.
In order to become apparent from that the present invention is described, it is further elucidated with present disclosure below in conjunction with embodiment, but the present invention Content is not limited solely to the following examples.
Embodiment 1
1:2 takes yittrium oxide (Y in molar ratio2O3) powder and silicon dioxide (SiO2) powder mixing, 1:11:2 takes in molar ratio La2O3Powder, Al2O3Powder and the mixing of MgO powder.Roll after two kinds of mixed-powders are all added deionized water and zirconia ball Formula ball milling 8h, takes out bead after ball milling, dry slurry in the baking oven of 100 DEG C, and the powder obtained after drying is quickly centrifuged Ball milling 10min, crosses the sieve of 60 μm.The Y of mix homogeneously that will obtain2O3And SiO2Material powder is anti-1400 DEG C of high temperature solid-state Answer 6h, synthesize highly purified Y2Si2O7Powder；The La of mix homogeneously that will obtain2O3、Al2O3With MgO material powder 1550 DEG C high temperature solid state reaction 6h, synthesizes highly purified LaMgAl11O19Powder.
By above-mentioned prepared Y2Si2O7Powder and LaMgAl11O19Powder according to mass ratio is all: powder: deionized water: lemon Lemon acid ammonium: the ratio mixing of arabic gum=100:100:0.5:1, ball milling 48h respectively, crosses 120 μm sieves after ball milling；After sieving Slurry mist projection granulating under the conditions of 100 DEG C, mist projection granulating powder through vibration sub-sieve screening, choose granular size be 32～ The mist projection granulating powder of 100 μm is as plasma spraying powder.
Matrix is carried out surface sand-blasting process, processes to be placed in ultrasonic cleaner and clean with EtOH Sonicate, take after cleaning 60 DEG C of drying baker, dry for standby is put into after going out natural air drying.
By above-mentioned prepared Y2Si2O7Powder is sent in the high-temperature plasma flame stream that plasma gun produces, at matrix surface Spraying a layer thickness is the Y of 70 μm2Si2O7Coating, naturally cools to room temperature, afterwards then at Y2Si2O7Coating surface spraying one Layer thickness is the LaMgAl of 95 μm11O19Coating, it is thus achieved that double ceramic layer thermal barrier coatings.
In spraying process, spraying current is 550A, and spray power is 30kW, and the plasma gas used by spraying is argon (Ar2) and hydrogen (H2), wherein the gas flow of argon is 30SLPM, and the gas flow of hydrogen is 10SLPM, and spray distance is 90mm。
Fig. 1 is ceramic layer Y in the thermal barrier coating that the embodiment of the present invention 1 prepares2Si2O7XRD figure, Fig. 1 illustrate, pottery Enamel coating phase composition is Y2Si2O7, products pure；Fig. 4 is the outer ceramic layer of thermal barrier coating that the embodiment of the present invention 1 prepares LaMgAl11O19XRD figure, Fig. 4 illustrate, ceramic layer phase composition is LaMgAl11O19, products pure；Fig. 5 is the embodiment of the present invention 1 The electron scanning micrograph of the thermal barrier coating prepared, Fig. 5 is it can be seen that the thermal boundary of the embodiment of the present invention 1 preparation is coated with Layer is evenly distributed, and is tightly combined with matrix, interior ceramic layer dense structure；
Utilize the base without coating of the matrix containing double ceramic layer thermal barrier coatings prepared by embodiment 1 method and sample as a comparison Body, all carries out 10 1400 DEG C of room temperature thermal shocks test, and the performance test results is as shown in table 1:
Table 1
Embodiment 2
1:2 takes Erbia (Er in molar ratio2O3) powder and silicon dioxide (SiO2) powder mixing；1:11:2 in molar ratio Take La2O3Powder, Al2O3Powder and the mixing of MgO powder；Two kinds of mixed-powders roll after all adding deionized water and zirconia ball Formula ball milling 10h, takes out bead after ball milling, dry slurry in the baking oven of 100 DEG C, the powder obtained after drying all carry out quickly from Bulbus cordis mill 15min, crosses the sieve of 60 μm.The preparation Er that will obtain2Si2O7Material powder solid under the hot environment of 1425 DEG C Phase reaction 6.5h；The preparation LaMgAl that will obtain11O19Material powder solid state reaction 6.5h under the hot environment of 1575 DEG C.
By above-mentioned prepared Er2Si2O7Powder and LaMgAl11O19Powder according to mass ratio is all: powder: deionized water: Ammonium citrate: the ratio mixing of arabic gum=100:110:0.6:1, ball milling 50h respectively, crosses 120 μm sieves after ball milling；Sieve After slurry mist projection granulating under 105 DEG C of temperature conditionss, mist projection granulating powder through vibration sub-sieve screening, choosing granular size is The mist projection granulating powder of 32～100 μm is as plasma spraying powder.
Matrix is carried out surface sand-blasting process, processes to be placed in ultrasonic cleaner and clean with EtOH Sonicate, take after cleaning 60 DEG C of drying baker, dry for standby is put into after going out natural air drying.
By above-mentioned prepared Er2Si2O7Powder is sent in the high-temperature plasma flame stream that plasma gun produces, at matrix table Face sprays the Er that a layer thickness is 116 μm2Si2O7Coating, naturally cools to room temperature, afterwards then at Er2Si2O7Coating surface sprays It is coated with the LaMgAl that a layer thickness is 103 μm11O19Coating, it is thus achieved that double ceramic layer thermal barrier coatings.
In spraying process, spraying current is 600A, and spray power is 35kW, and the plasma gas used by spraying is argon (Ar2) and hydrogen (H2), wherein the gas flow of argon is 35SLPM, and the gas flow of hydrogen is 15SLPM, and spray distance is 95mm。
Fig. 2 is ceramic layer Er in the thermal barrier coating that the embodiment of the present invention 2 prepares2Si2O7XRD figure, Fig. 2 illustrate, pottery Enamel coating phase composition is Er2Si2O7, products pure；Fig. 6 is that the scanning electron of the thermal barrier coating that the embodiment of the present invention 2 prepares shows Micro mirror photo, Fig. 6, it can be seen that the thermal barrier coating that the embodiment of the present invention 1 prepares is evenly distributed, is tightly combined with matrix, Interior ceramic layer dense structure.
Utilize the base without coating of the matrix containing double ceramic layer thermal barrier coatings prepared by embodiment 2 method and sample as a comparison Body, all carries out 10 1400 DEG C of room temperature thermal shocks test, the performance test results is as shown in table 2:
Table 2
Embodiment 3
1:2 takes ytterbium oxide (Yb in molar ratio2O3) powder and silicon dioxide (SiO2) powder mixing；1:11:2 in molar ratio Take La2O3Powder, Al2O3Powder and the mixing of MgO powder；After two kinds of mixed-powders are all added deionized water and zirconia ball Roll-type ball milling 15h, takes out bead after ball milling, dry slurry in the baking oven of 100 DEG C, and the powder obtained after drying is all carried out quickly Centrifugal ball milling 20min, crosses the sieve of 60 μm.The preparation Yb that will obtain2Si2O7Material powder under the hot environment of 1450 DEG C Solid state reaction 7h；The preparation LaMgAl that will obtain11O19Material powder solid state reaction 7h under the hot environment of 1600 DEG C.
By above-mentioned prepared Yb2Si2O7Powder and LaMgAl11O19Powder according to mass ratio is all: powder: deionized water: Ammonium citrate: the ratio mixing of arabic gum=100:120:0.7:2, ball milling 55h respectively, all crosses 120 μm sieves after ball milling；Cross Slurry after sieve all mist projection granulatings under 110 DEG C of temperature conditionss, mist projection granulating powder, through vibration sub-sieve screening, chooses granule big Little is that the mist projection granulating powder of 32～100 μm is as plasma spraying powder.
Matrix is carried out surface sand-blasting process, processes to be placed in ultrasonic cleaner and clean with EtOH Sonicate, take after cleaning 60 DEG C of drying baker, dry for standby is put into after going out natural air drying.
By above-mentioned prepared Yb2Si2O7Powder is sent in the high-temperature plasma flame stream that plasma gun produces, at matrix table Face sprays the Yb that a layer thickness is 60 μm2Si2O7Coating, naturally cools to room temperature, afterwards then at Yb2Si2O7Coating surface sprays It is coated with the LaMgAl that a layer thickness is 65 μm11O19Coating, it is thus achieved that double ceramic layer thermal barrier coatings.
In spraying process, spraying current is 700A, and spray power is 40kW, and the plasma gas used by spraying is argon (Ar2) and hydrogen (H2), wherein the gas flow of argon is 40SLPM, and the gas flow of hydrogen is 20SLPM, and spray distance is 110mm。
Fig. 3 is ceramic layer Yb in the thermal barrier coating that the embodiment of the present invention 3 prepares2Si2O7XRD figure, Fig. 3 illustrate, pottery Enamel coating phase composition is Yb2Si2O7, products pure；Fig. 7 is that the scanning electron of the thermal barrier coating that the embodiment of the present invention 3 prepares shows Micro mirror photo, from figure 7 it can be seen that the thermal barrier coating that the embodiment of the present invention 3 prepares is evenly distributed, is combined tightly with matrix Close, interior ceramic layer dense structure.
Utilize the matrix containing Double-layer Thermal Barrier Coatings prepared by embodiment 3 method and sample as a comparison without coated substrate, All carrying out 10 1400 DEG C of room temperature thermal shocks test, the performance test results is as shown in table 3:
Table 3
The foregoing is only the preferred embodiment of the present invention, it is noted that those of ordinary skill in the art is come Saying, without departing from the concept of the premise of the invention, making some modifications and variations, these broadly fall into the protection model of the present invention Enclose.

Claims (10)

1. a CfThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, it is characterised in that the method bag Include:
Step one: prepare Re respectively2Si2O7Powder and LaMgAl11O19Powder, Re is rare earth element, in Y, Er or Yb Kind；
Step 2: the Re that step one is obtained2Si2O7Powder and LaMgAl11O19Powder respectively with deionized water, ammonium citrate, Ah Draw primary glue to mix, obtain Re2Si2O7Slurry and LaMgAl11O19Slurry, by Re2Si2O7Slurry and LaMgAl11O19Slurry enters respectively Row ball milling, sieve and pelletize, obtain Re2Si2O7Dusty spray and LaMgAl11O19Dusty spray；
Step 3: by Cf/ SiC matrix carries out pretreatment, obtains pretreated Cf/ SiC matrix；
Step 4: use APS technology to prepare coating, Re step 2 obtained2Si2O7Dusty spray and LaMgAl11O19Spray coating powder End is respectively put in plasma gun, at the pretreated C that step 3 obtainsfRe is sprayed successively in/SiC matrix2Si2O7Pottery Enamel coating and LaMgAl11O19Ceramic layer, obtains Cf/ SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating.
A kind of C the most according to claim 1fThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, its It is characterised by, described preparation Re2Si2O7Powder particularly as follows:
By Re2O3Powder and SiO2Powder mixes, and adds water and zirconia ball in mixed-powder, on ball mill ball milling 6～ 12h, the slurry drying obtained, centrifugal ball milling, sieves, and obtains product and reacts 6～12h at 1400～1500 DEG C, obtains Re2Si2O7Powder.
A kind of C the most according to claim 2fThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, its It is characterised by, described Re2O3Powder and SiO2The mol ratio of powder is 1:2.
A kind of C the most according to claim 1fThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, its It is characterised by, described preparation LaMgAl11O19Powder particularly as follows:
Lanthanum oxide powder, alumina powder and magnesium oxide powder are mixed, in mixed-powder, adds water and zirconia ball, Ball milling 6～12h on ball mill, the slurry drying obtained, centrifugal ball milling, sieve, and obtain product and react 6 at 1550～1650 DEG C ～12h, obtain LaMgAl11O19Powder.
A kind of C the most according to claim 4fThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, its Being characterised by, the mol ratio of described lanthanum oxide powder, alumina powder and magnesium oxide powder is 1:11:2.
A kind of C the most according to claim 1fThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, its It is characterised by, described Re2Si2O7The mass ratio of powder, deionized water, ammonium citrate and arabic gum is 100:(100- 150): (0.4-0.8): (1-2)；LaMgAl11O19The mass ratio of powder, deionized water, ammonium citrate and arabic gum is 100: (100-150): (0.4-0.8): (1-2).
A kind of C the most according to claim 1fThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, its Being characterised by, the Ball-milling Time of described step 2 is 48～72h.
A kind of C the most according to claim 1fThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, its Being characterised by, the preprocessing process of described step 3 is: by Cf/ SiC matrix surface emergy carries out blasting treatment, then By Cf/ SiC matrix with ethanol purge, obtains pretreated C in ultrasonic cleaner after dryingf/ SiC matrix.
A kind of C the most according to claim 1fThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, its Being characterised by, in described step 4 spraying process, spraying current is 500～700A, and spray power is 30～40kW, plasma Gas is argon and hydrogen, and wherein argon flow amount is 30～40SLPM, and hydrogen flowing quantity is 10～20SLPM, spray distance be 90～ 110mm。
A kind of C the most according to claim 1fThe preparation method of/SiC ceramic matrix composite material surface high-temp oxidation-inhibited thermal barrier coating, It is characterized in that, described step 4 sprays Re2Si2O7The thickness of ceramic layer is 40～120 μm, LaMgAl11O19Ceramic layer Thickness be 40～120 μm.
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CN107032831A (en) * 2017-03-29 2017-08-11 北京航空航天大学 A kind of Rare Earth T/EBC ceramic bases combinational environment barrier coating and preparation method thereof
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Application publication date: 20161116