CN116285468B - Al (aluminum) alloy2O3And Ti is2AlC composite wave-absorbing coating and preparation method thereof - Google Patents
Al (aluminum) alloy2O3And Ti is2AlC composite wave-absorbing coating and preparation method thereof Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 87
- 239000002131 composite material Substances 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 title description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title description 2
- 239000002994 raw material Substances 0.000 claims abstract description 46
- 239000000843 powder Substances 0.000 claims abstract description 44
- 238000007750 plasma spraying Methods 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 28
- 239000011159 matrix material Substances 0.000 claims description 23
- 239000000956 alloy Substances 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 14
- 229910052759 nickel Inorganic materials 0.000 claims description 14
- 238000000498 ball milling Methods 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 5
- 239000011358 absorbing material Substances 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims description 2
- 238000004064 recycling Methods 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 2
- 239000010936 titanium Substances 0.000 description 64
- 239000000919 ceramic Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
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- 229910052719 titanium Inorganic materials 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005524 ceramic coating Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
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- 229910009817 Ti3SiC2 Inorganic materials 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
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- 238000010276 construction Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910016459 AlB2 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910009818 Ti3AlC2 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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- 230000007123 defense Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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- 150000002738 metalloids Chemical class 0.000 description 1
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- 239000011215 ultra-high-temperature ceramic Substances 0.000 description 1
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- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/32—Radiation-absorbing paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
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Abstract
The invention relates to an Al 2O3 and Ti 2 AlC composite wave-absorbing coating and a preparation method thereof. The composite wave-absorbing coating comprises the following component raw materials in percentage by mass: 50-90% of Al 2O3, 10-50% of Ti 2 AlC; wherein the sum of the components of the Al 2O3 and the Ti 2 AlC is 100 percent. The composite wave-absorbing coating directly adopts the existing raw material powder on the market as the raw material, has the characteristics of simple raw material obtaining mode, low cost and self-repairing and recycling. The preparation method of the composite wave-absorbing coating is simple and easy to operate and is suitable for industrial production by optimizing the supersonic plasma spraying process and the raw material powder proportion.
Description
Technical Field
The invention relates to the technical field of materials, in particular to an Al 2O3 and Ti 2 AlC composite wave-absorbing coating and a preparation method thereof.
Background
In the 90 th century of the 20 th century, hypersonic aircrafts with a speed of more than 5 Mach became the focus of competitive development of aerospace and defense departments of various countries with the rapid development of aerospace technology and the development and application of near space (20 km-100 km) aircrafts.
From the standpoint of hypersonic aircraft construction, the transition between the warhead and the projectile is made of inconel in order to prevent heat transfer to the rest of the aircraft. The frame, the panel walls of the projectile body portion and the skin of the projectile body and interstage portion, including the four full-motion tail fins of the propeller, are all aluminum. Some constructions of the interstage section and the tail cone of the impeller are made of titanium metal material and the outer surface of the impeller is made of steel. Meanwhile, the reusable hypersonic aircraft also needs to undergo high-low temperature transformation, which requires that the ceramic coating material has good interface bonding and thermal matching with the metal matrix of the aircraft on one hand, and can be self-repaired to achieve the effect of repeated use on the other hand. Based on the method, development and design of the high-temperature-resistant ceramic coating which can absorb waves in a wide frequency domain, can be combined with a metal good interface and can be repaired by self are key to realizing stealth and recycling of the aircraft.
The preparation of the ceramic coating is a rapid heating and rapid cooling process, thermal stress is inevitably generated, and under the space complex service environment, the bonding force between the coating and a substrate can be damaged due to alternating load and temperature change, so that the coating falls off in the long-term use process. How to expand and improve the wave-absorbing frequency domain and the intrinsic brittleness of the ultra-high temperature ceramic material, reasonably select and design the system of the ceramic matrix composite material, realize the design and the preparation of the coating, and improve the toughness and the oxidation resistance is an important challenge facing the research field.
Disclosure of Invention
The invention successfully develops the high-temperature wide-frequency-domain wave-absorbing self-repairing recyclable composite material coating of the Ti 2 AlC reinforced Al 2O3 matrix and the preparation method thereof based on a mechanism that the composite wave-absorbing material can convert incident electromagnetic wave energy into heat energy or other forms of energy through an electromagnetic loss or microwave interference mechanism so as to effectively dissipate the energy.
The invention provides an Al 2O3 and Ti 2 AlC composite wave-absorbing coating, which comprises the following component raw materials in percentage by mass: 50-90% of Al 2O3, 10-50% of Ti 2 AlC; wherein the sum of the components of the Al 2O3 and the Ti 2 AlC is 100 percent.
The invention provides another Al 2O3 and Ti 2 AlC composite wave-absorbing coating, which comprises the following components in percentage by mass: 50 to 93 percent of Al 2O3, 5 to 48 percent of Ti 2 AlC,0.1 to 1 percent of Ti 3AlC2 and 0.1 to 1 percent of TiC. It should be noted that this is because a part of Ti 2 AlC in the raw material powder is decomposed into Al 2O3, ti 3AlC2 and TiC at high temperature during the spraying process, so that the mass percentage of Ti 2 AlC in the coating is reduced, the mass percentage of three substances Ti 3AlC2、TiC、Al2O3 is increased, the added part of Al 2O3 is derived from Ti 2 AlC, and Ti 3AlC2 and TiC in the coating obtained by spraying are not impurities but Ti 2 AlC decomposition products.
Further, the Al 2O3 has a particle size of 15 to 45. Mu.m, and the Ti 2 AlC has a particle size of 15 to 40. Mu.m.
Further, the microhardness of the composite wave-absorbing coating is 600 to 900HV, and the tensile interface bonding strength is 25 to 35MPa.
Furthermore, according to GJB5022 standard, for the composite wave-absorbing coating sample with the frequency of 300mm multiplied by 5mm, under the test condition of utilizing the radar wave-absorbing material RAM reflectivity bow method in the frequency range of 8 GHz-18 GHz, the effective wave-absorbing bandwidth of the composite wave-absorbing coating is larger than 2GHz, and the minimum reflection loss is smaller than-20 dB.
Further, the thickness of the composite wave-absorbing coating is 0.5 mm-2 mm.
The invention also provides a preparation method of the Al 2O3 and Ti 2 AlC composite wave-absorbing coating, which comprises the following steps: preparing raw materials of each component according to a formula, and placing Al 2O3 and Ti 2 AlC in a planetary ball mill for ball milling until the raw materials are fully mixed to obtain composite raw material powder; taking nickel-based alloy as a matrix, and placing the matrix in a muffle furnace to be preheated to 150 ℃; placing the composite raw material powder into a powder feeder of a supersonic plasma spraying device, fixing the preheated substrate on the supersonic plasma spraying device, and performing supersonic plasma spraying treatment to obtain the Al 2O3 and Ti 2 AlC composite wave-absorbing coating; wherein the parameters of the spraying treatment include: argon gas flow rate is 70L/min-85L/min, hydrogen gas flow rate is 10L/min-20L/min, voltage is 100V-120V, current is 350A-450A, powder feeding pressure is 0.4 MPa-0.5 MPa, powder feeding flow rate is 18 g/min-20 g/min, and spraying distance is 80 mm-100 mm;
further, the ball milling treatment time is 8-12 hours.
Compared with the prior art, the invention has the following characteristics:
The invention provides an Al 2O3 and Ti 2 AlC composite wave-absorbing coating and a preparation method thereof, wherein the composite wave-absorbing coating directly adopts the existing raw material powder on the market as the raw material, the raw material obtaining mode is simple, the cost is low, and the product has the characteristic of self-repairing and recycling. The preparation method of the composite wave-absorbing coating is simple and easy to operate and is suitable for industrial production by optimizing the supersonic plasma spraying process and the raw material powder proportion.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, which are not to be construed as limiting the embodiments unless specifically indicated otherwise.
FIG. 1 is a scanning electron microscope image of a 50wt.% Al 2O3/50wt.％Ti2 AlC composite wave-absorbing coating of example 1 of the present invention;
FIG. 2 is a scanning electron microscope image of a 60wt.% Al 2O3/40wt.％Ti2 AlC composite wave-absorbing coating of example 2 of the present invention;
FIG. 3 is a scanning electron microscope image of a 70wt.% Al 2O3/30wt.％Ti2 AlC composite wave-absorbing coating of example 3 of the present invention;
FIG. 4 is a scanning electron microscope image of an 80wt.% Al 2O3/20wt.％Ti2 AlC composite wave-absorbing coating of example 4 of the present invention;
Fig. 5 is a scanning electron microscope image of a 90wt.% Al 2O3/10wt.％Ti2 AlC composite wave-absorbing coating of example 5 of the present invention.
Detailed Description
The inventors found that Al 2O3 ceramic is a well-known ceramic matrix material with low density, excellent high temperature strength and good high temperature oxidation resistance in order to meet the requirements of high temperature, long time and repeated use. Therefore, the design of the Al 2O3 ceramic matrix composite is the first choice, but the pure Al 2O3 ceramic has extremely poor formability in the coating preparation process and extremely poor Al 2O3 wave absorbing performance. The high-performance wave-absorbing material is a composite material formed by two or more materials through proper composition and structural design. The novel ternary lamellar MAX phase ceramic is a good damage tolerance ceramic material with high strength and high toughness and excellent conductive performance of metalloids, typical materials are Ti 3SiC2、Ti2AlC、Ti3(SiAl)C2 solid solution and Cr 2AlB2, the density is 4-5 g/cm 3, the Young's modulus is 280-340 GPa, and the room temperature fracture toughness is 6.0-7.88 MPa m 1/2. In addition, the novel ternary MAX phase ceramic has the comprehensive advantages of excellent wave absorption, high Wen Ziyu joint repair, oxidation resistance and good combination with metal matrix wetting. How to prepare the high-temperature wide-frequency-domain wave-absorbing self-repairing recyclable composite material coating of the Ti 2 AlC reinforced Al 2O3 matrix by optimizing the supersonic plasma spraying process and the raw material powder proportion becomes the key point for developing the novel Al 2O3 and Ti 2 AlC composite wave-absorbing coating.
The invention provides an Al 2O3 and Ti 2 AlC composite wave-absorbing coating, which comprises the following component raw materials in percentage by mass: 50-90% of Al 2O3, 10-50% of Ti 2 AlC; wherein the sum of the components of the Al 2O3 and the Ti 2 AlC is 100 percent.
It should be noted that Ti 2 AlC may be replaced by other MAX phase ceramics, including, but not limited to, one or more of Ti 3AlC2、Ti3SiC2、Cr2 AlC and Mo 2 AlB. The Ti 2AlC、Ti3AlC2、Ti3SiC2、Cr2 AlC and the Mo 2 AlB are the same chemical substances, so the composite wave-absorbing coating with the same performance can be prepared by correspondingly taking the same as the raw materials.
The invention also provides an Al 2O3 and Ti 2 AlC composite wave-absorbing coating, which comprises the following components in percentage by mass: 50 to 93 percent of Al 2O3, 5 to 48 percent of Ti 2 AlC,0.1 to 1 percent of Ti 3AlC2 and 0.1 to 1 percent of TiC.
Wherein the particle size of the Al 2O3 is 15-45 μm, and the particle size of the Ti 2 AlC is 15-40 μm.
The invention also provides a preparation method of the Al 2O3 and Ti 2 AlC composite wave-absorbing coating, which comprises the following steps:
S1, preparing raw materials of all components according to a formula, and placing Al 2O3 and Ti 2 AlC in a planetary ball mill for ball milling until the raw materials are fully mixed to obtain composite raw material powder;
s2, taking the nickel-based alloy as a matrix, and placing the matrix in a muffle furnace for preheating to 150 ℃;
S3, placing the composite raw material powder into a powder feeder of a supersonic plasma spraying device, fixing the preheated substrate on the supersonic plasma spraying device, and performing supersonic plasma spraying treatment to obtain the Al 2O3 and Ti 2 AlC composite wave-absorbing coating;
Wherein the parameters of the spraying treatment include: argon gas flow rate is 70-85L/min, hydrogen gas flow rate is 10-20L/min, voltage is 100-120V, current is 350-450A, powder feeding pressure is 0.4-0.5 MPa, powder feeding flow rate is 18-20 g/min, and spraying distance is 80-100 mm.
The present invention will be described in detail with reference to the following embodiments.
Example 1
Example 1 provides an Al 2O3 and Ti 2 AlC composite wave-absorbing coating and a preparation method thereof, the preparation method comprising:
The composite wave-absorbing coating comprises the following raw material powder in percentage by mass: al 2O3：50％,Ti2 AlC:50%, the sum of the two components is 100%, and the required Al 2O3 and Ti 2 AlC are weighed;
Placing the two raw material powders into a planetary ball mill for ball milling for 8-12 hours to realize full mixing;
placing the nickel-based alloy matrix in a muffle furnace for preheating to 150 ℃;
Placing the composite raw material powder into a powder feeder of a supersonic plasma spraying device, fixing the preheated nickel-based alloy matrix on the supersonic plasma spraying device by adopting a clamp, preparing a supersonic plasma spraying composite wave-absorbing coating by using the plasma spraying parameters, and finally obtaining the composite wave-absorbing coating, wherein Ti 2 AlC in the coating is in a layered shape and is dispersed in Al 2O3 as shown in figure 1. The microhardness of the composite wave-absorbing coating is 650+/-50 HV, and the bonding strength of the coating is 30+/-5 MPa.
Example 2
Example 2 provides an Al 2O3 and Ti 2 AlC composite wave-absorbing coating and a preparation method thereof, the preparation method comprising:
The composite wave-absorbing coating comprises the following raw material powder in percentage by mass: al 2O3：60％,Ti2 AlC:40, weighing required Al 2O3 and Ti 2 AlC, wherein the sum of the two components is 100%;
Placing the two raw material powders into a planetary ball mill for ball milling for 8-12 hours to realize full mixing;
placing the nickel-based alloy matrix in a muffle furnace for preheating to 150 ℃;
Placing the composite raw material powder into a powder feeder of a supersonic plasma spraying device, fixing the preheated nickel-based alloy matrix on the supersonic plasma spraying device by adopting a clamp, preparing a supersonic plasma spraying composite wave-absorbing coating by using the spraying parameters, and finally obtaining the composite wave-absorbing coating, wherein Ti 2 AlC in the coating is in a layered shape and is dispersed in Al 2O3 as shown in figure 2. The microhardness of the composite wave-absorbing coating is 700+/-50 HV, and the bonding strength of the coating is 30+/-5 MPa.
Example 3
Example 3 provides an Al 2O3 and Ti 2 AlC composite wave-absorbing coating and a method for preparing the same, the method comprising:
The composite wave-absorbing coating comprises the following raw material powder in percentage by mass: al 2O3：70％,Ti2 AlC:30%, the sum of the two components is 100%, and the required Al 2O3 and Ti 2 AlC are weighed;
Placing the two raw material powders into a planetary ball mill for ball milling for 8-12 hours to realize full mixing;
placing the nickel-based alloy matrix in a muffle furnace for preheating to 150 ℃;
placing the composite raw material powder into a powder feeder of a supersonic plasma spraying device, fixing the preheated nickel-based alloy matrix on the supersonic plasma spraying device by adopting a clamp, preparing a supersonic plasma spraying composite wave-absorbing coating by using the spraying parameters, and finally obtaining the composite wave-absorbing coating, wherein Ti 2 AlC in the coating is in a layered shape and is dispersed in Al 2O3 as shown in figure 3. The microhardness of the composite wave-absorbing coating is 750+/-50 HV, and the bonding strength of the coating is 30+/-5 MPa.
Example 4
Example 4 provides an Al 2O3 and Ti 2 AlC composite wave-absorbing coating and a method for preparing the same, the method comprising:
The composite wave-absorbing coating comprises the following raw material powder in percentage by mass: al 2O3：80％,Ti2 AlC:20, weighing required Al 2O3 and Ti 2 AlC, wherein the sum of the two components is 100%;
Placing the two raw material powders into a planetary ball mill for ball milling for 8-12 hours to realize full mixing;
placing the nickel-based alloy matrix in a muffle furnace for preheating to 150 ℃;
Placing the composite raw material powder into a powder feeder of a supersonic plasma spraying device, fixing the preheated nickel-based alloy matrix on the supersonic plasma spraying device by adopting a clamp, preparing a supersonic plasma spraying composite wave-absorbing coating by using the plasma spraying parameters, and finally obtaining the composite wave-absorbing coating, wherein Ti 2 AlC in the coating is in a layered shape and is dispersed in Al 2O3 as shown in figure 4. The microhardness of the composite wave-absorbing coating is 800+/-50 HV, and the bonding strength of the coating is 30+/-5 MPa.
Example 5
Example 5 provides an Al 2O3 and Ti 2 AlC composite wave-absorbing coating and a method for preparing the same, the method comprising:
The composite wave-absorbing coating comprises the following raw material powder in percentage by mass: al 2O3：90％,Ti2 AlC:10, weighing required Al 2O3 and Ti 2 AlC, wherein the sum of the two components is 100%;
Placing the two raw material powders into a planetary ball mill for ball milling for 8-12 hours to realize full mixing;
placing the nickel-based alloy matrix in a muffle furnace for preheating to 150 ℃;
Placing the composite raw material powder into a powder feeder of a supersonic plasma spraying device, fixing the preheated nickel-based alloy matrix on the supersonic plasma spraying device by adopting a clamp, preparing a supersonic plasma spraying composite wave-absorbing coating by using the plasma spraying parameters, and finally obtaining the composite wave-absorbing coating, wherein Ti 2 AlC in the coating is in a layered shape and is dispersed in Al 2O3 as shown in figure 5. The microhardness of the composite wave-absorbing coating is 850+/-50 HV, and the bonding strength of the coating is 30+/-5 MPa.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the application and that various changes in form and details may be made therein without departing from the spirit and scope of the application. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the application, and the scope of the application is therefore intended to be limited only by the appended claims.
Claims (7)
1. The Al 2O3 and Ti 2 AlC composite wave-absorbing coating is characterized by comprising the following component raw materials in percentage by mass: 50-90% of Al 2O3, 10-50% of Ti 2 AlC;
Wherein the sum of the components of the Al 2O3 and the Ti 2 AlC is 100 percent;
The grain diameter of the Al 2O3 is 15-45 mu m, and the grain diameter of the Ti 2 AlC is 15-40 mu m;
the preparation method of the Al 2O3 and Ti 2 AlC composite wave-absorbing coating comprises the following steps:
Preparing raw materials of each component according to a formula, and placing Al 2O3 and Ti 2 AlC in a planetary ball mill for ball milling until the raw materials are fully mixed to obtain composite raw material powder;
Taking nickel-based alloy as a matrix, and placing the matrix in a muffle furnace to be preheated to 150 ℃;
Placing the composite raw material powder into a powder feeder of a supersonic plasma spraying device, fixing the preheated substrate on the supersonic plasma spraying device, and performing supersonic plasma spraying treatment to obtain the Al 2O3 and Ti 2 AlC composite wave-absorbing coating.
2. The Al 2O3 and Ti 2 AlC composite wave-absorbing coating is characterized by comprising the following components in percentage by mass: 50-93% of Al 2O3%, 5-48% of Ti 2 AlC, 0.1-1% of Ti 3AlC2 and 0.1-1% of TiC;
The grain diameter of the Al 2O3 is 15-45 mu m, and the grain diameter of the Ti 2 AlC is 15-40 mu m;
the preparation method of the Al 2O3 and Ti 2 AlC composite wave-absorbing coating comprises the following steps:
Preparing raw materials of each component according to a formula, and placing Al 2O3 and Ti 2 AlC in a planetary ball mill for ball milling until the raw materials are fully mixed to obtain composite raw material powder;
Taking nickel-based alloy as a matrix, and placing the matrix in a muffle furnace to be preheated to 150 ℃;
Placing the composite raw material powder into a powder feeder of a supersonic plasma spraying device, fixing the preheated substrate on the supersonic plasma spraying device, and performing supersonic plasma spraying treatment to obtain the Al 2O3 and Ti 2 AlC composite wave-absorbing coating.
3. The Al 2O3 and Ti 2 AlC composite wave-absorbing coating according to claim 1 or 2, wherein the composite wave-absorbing coating has a microhardness of 600HV to 900HV and a tensile interfacial bond strength of 25MPa to 35MPa.
4. The Al 2O3 and Ti 2 AlC composite wave-absorbing coating according to claim 1 or 2, wherein the effective wave-absorbing bandwidth of the composite wave-absorbing coating is greater than 2GHz and the minimum reflection loss is less than-20 dB under the test condition of using radar wave-absorbing material RAM reflectivity bow method in the frequency range of 8GHz to 18GHz for the composite wave-absorbing coating sample of 300mm x 5mm according to the GJB5022 standard.
5. The Al 2O3 and Ti 2 AlC composite wave-absorbing coating according to claim 1 or 2, wherein the thickness of the composite wave-absorbing coating is 0.5mm to 2mm.
6. The Al 2O3 and Ti 2 AlC composite wave-absorbing coating according to claim 1 or 2, wherein the parameters of the spray coating process include: argon gas flow rate is 70-85L/min, hydrogen gas flow rate is 10-20L/min, voltage is 100-120V, current is 350-450A, powder feeding pressure is 0.4-0.5 MPa, powder feeding flow rate is 18-20 g/min, and spraying distance is 80-100 mm.
7. The Al 2O3 and Ti 2 AlC composite wave-absorbing coating according to claim 1 or 2, wherein the time of the ball milling treatment is 8-12 h.
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