CN115190756A - Three-dimensional lattice structure high-temperature wave-absorbing material and preparation method thereof - Google Patents
Three-dimensional lattice structure high-temperature wave-absorbing material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of high-temperature wave-absorbing materials, and particularly discloses a three-dimensional lattice structure high-temperature wave-absorbing material which sequentially comprises a continuous fiber reinforced ceramic matrix composite lower panel, a three-dimensional loss type continuous silicon carbide fiber reinforced ceramic matrix composite lattice structure and a high-resistance type continuous silicon carbide fiber reinforced ceramic matrix composite panel from bottom to top. The three-dimensional lattice structure high-temperature wave-absorbing material has excellent broadband wave-absorbing performance, and the wave-absorbing frequency range covers 1 to 18GHz; low density, excellent heat insulating performance, good temperature resistance and high temperature stability.
Description
Technical Field
The invention belongs to the technical field of high-temperature wave-absorbing materials, and particularly relates to a three-dimensional lattice structure high-temperature wave-absorbing material and a preparation method thereof.
Background
The three-dimensional lattice material is a novel light high-strength multifunctional material, has the characteristics of low density, high strength, good heat insulation performance, strong impact resistance and the like, and has wide application prospect in the field of aerospace. The three-dimensional lattice wave-absorbing material not only has the general characteristics of a three-dimensional lattice structure, but also can obviously attenuate radar wave energy and realize wave-absorbing performance through the optimized design of the structure and the electromagnetic parameters of the material. At present, the type of the three-dimensional lattice wave-absorbing material is mainly a honeycomb wave-absorbing composite material, and the honeycomb wave-absorbing composite material has the characteristics of small density, strong absorption, wide absorption frequency band and strong designability of wave-absorbing performance, has good mechanical properties, can be used as a structural member to realize structural wave-absorbing integration, and has become an important research and development direction of the current stealth material.
Chinese patent ZL201610166422.5 discloses a preparation method of a honeycomb structure radar wave-absorbing material, which comprises the steps of placing a honeycomb core in slurry containing functionalized graphene, resin and the like for soaking, curing to obtain first to third wave-absorbing honeycombs, sequentially bonding the first to third wave-absorbing honeycombs together to prepare a honeycomb structure, then respectively covering a PMI (polyamide index) skin layer on the upper surface and the lower surface of the cured honeycomb structure, and bonding a metal substrate reflecting layer below the PMI skin layer on the lower surface to obtain the honeycomb structure radar wave-absorbing material, wherein the honeycomb structure radar wave-absorbing material has broadband stealth performance; ZL201911071094.0 discloses a preparation method of a foam honeycomb composite interlayer wave-absorbing material, which comprises the steps of flatly pressing aramid fiber honeycombs into hard wave-absorbing foams with the same thickness by adopting a flat hot press to obtain wave-absorbing foam honeycomb core materials, and then adhering wave-transmitting skin on the upper and lower surfaces of the wave-absorbing foam honeycomb core to prepare the foam honeycomb composite interlayer wave-absorbing material, and the foam honeycomb composite interlayer wave-absorbing material has a broadband strong absorption effect. The existing honeycomb wave-absorbing composite material is mainly prepared by spraying or soaking certain wave-absorbing resin-based slurry on the honeycomb wall, or filling wave-absorbing foam, and finally covering skins on the upper surface and the lower surface of a honeycomb core, and the honeycomb wave-absorbing composite material is an organic material system which contains a large amount of resin or foam and other materials with poor temperature resistance and does not have high temperature resistance.
Disclosure of Invention
The invention aims to provide a three-dimensional lattice structure high-temperature wave-absorbing material and a preparation method thereof.
In order to achieve the purpose, the invention provides a three-dimensional lattice structure high-temperature wave-absorbing material which sequentially comprises a continuous fiber reinforced ceramic matrix composite lower panel, a three-dimensional loss type continuous silicon carbide fiber reinforced ceramic matrix composite lattice structure and a high-resistance type continuous silicon carbide fiber reinforced ceramic matrix composite panel from bottom to top (the upper part is the incident direction of electromagnetic waves), wherein the continuous fiber reinforced ceramic matrix composite lower panel is a continuous carbon fiber reinforced ceramic matrix composite or a low-resistance continuous silicon carbide fiber reinforced ceramic matrix composite.
Preferably, in the three-dimensional lattice structure high-temperature wave-absorbing material, the silicon carbide fiber in the three-dimensional loss type continuous silicon carbide fiber reinforced ceramic matrix composite lattice structure is in a two-dimensional fabric form, the thickness direction of the two-dimensional fabric is parallel to the upper panel and the lower panel, the section of the three-dimensional lattice structure in the direction parallel to the thickness direction of the two-dimensional fabric is square, the side length of the square is 4 to 20mm, the thickness of the two-dimensional fabric of the silicon carbide fiber is 0.2 to 0.5mm, and the resistivity of the silicon carbide fiber is 1 to 20 Ω · cm.
Preferably, in the three-dimensional lattice structure high-temperature wave-absorbing material, the reinforcement of the lower panel of the continuous fiber reinforced ceramic matrix composite is two-dimensional cloth, acupuncture, sewing, 2.5D or 3D fiber fabric.
Preferably, in the three-dimensional lattice structure high-temperature wave-absorbing material, the resistivity of the silicon carbide fiber in the low-resistance continuous silicon carbide fiber reinforced ceramic matrix composite is less than 0.1 Ω · cm.
Preferably, in the three-dimensional lattice structure high-temperature wave-absorbing material, the reinforcement of the upper panel of the high-resistance continuous silicon carbide fiber reinforced ceramic matrix composite material is two-dimensional cloth, acupuncture, sewing, 2.5D or 3D silicon carbide fiber fabric, and the resistivity of the silicon carbide fiber is greater than 1 × 10 4 Ω·cm。
Preferably, in the three-dimensional lattice structure high-temperature wave-absorbing material, the lower panel of the continuous carbon fiber reinforced ceramic matrix composite, the three-dimensional loss type continuous silicon carbide fiber reinforced ceramic matrix composite lattice structure and the upper panel of the high-resistance type continuous silicon carbide fiber reinforced ceramic matrix composite have the same base body, and the base body is silicon carbide, silicon oxycarbide, silicon carbon nitride, silicon boron nitrogen, boron nitride or silicon boron carbon nitride.
A preparation method of the three-dimensional lattice structure high-temperature wave-absorbing material comprises the following steps:
(1) According to the height of the designed lattice structure, cutting the silicon carbide fiber two-dimensional fabric of the lattice structure meeting the design requirement into fabric strips, wherein the width of each fabric strip is the height of the lattice, and the length of each fabric strip is the width of the wave-absorbing material; according to the side length of the square of the section of the three-dimensional lattice structure, a polypropylene low-carbon-residue adhesive tape is bonded at the position of a to-be-cut opening, so that the fabric is prevented from edge scattering during cutting; cutting a notch in the width direction of the fabric, wherein the length of the notch is 0.5 to 0.6 times of the width of the fabric strip, and the notch distance is the side length of a square of the cross section;
(2) Dividing the wave-absorbing material into X and Y directions along the surface, respectively arranging the fabric strips obtained in the step (1) along the X direction and the Y direction, wherein the notches of the fabric strips in the X direction are arranged opposite to the notches of the fabric strips in the Y direction, and the notches in the X direction and the notches in the Y direction are embedded in a one-to-one correspondence manner to assemble the fabric with a lattice structure;
(3) Laying a lower panel fiber fabric, a lattice structure fabric and an upper panel fiber fabric, and sewing carbon fiber or silicon carbide fiber yarns near the interweaving points of the fabric strips in the X direction and the Y direction of the lattice structure fabric respectively to form an integral fiber woven part by the three layers of fabrics;
(4) Taking silicon carbide, silicon oxygen carbon, silicon carbon nitrogen, silicon boron nitrogen, boron nitride or silicon boron carbon nitrogen organic precursor solution as a dipping solution, and carrying out dipping, high-temperature cracking and 2-4 times of initial densification on the whole fiber woven part obtained in the step (3) by adopting a precursor dipping cracking process;
(5) After the initial densification is finished, drilling liquid discharge holes with the diameter of 2-3 mm on the lower panel, wherein the hole spacing is 5-20mm, so that a precursor solution can effectively enter and exit the lattice structure in the subsequent densification process;
(6) And continuously performing densification processes for 6 to 8 times to complete the preparation of the three-dimensional lattice structure high-temperature wave-absorbing material.
Preferably, in the preparation method of the three-dimensional lattice structure high-temperature wave-absorbing material, the mass content of the precursor in the precursor dipping solution is not lower than 40%; the impregnation cracking process parameters are as follows: the vacuum impregnation time is not less than 4h, and the pressure is not more than-0.09 MPa; the pyrolysis temperature is 800 to 1000 ℃, and the time is 0.5 to 1h.
Preferably, in the preparation method of the three-dimensional lattice structure high-temperature wave-absorbing material, the thickness of the polypropylene low-carbon-residue adhesive tape is 0.02 to 0.03mm.
Compared with the prior art, the invention has the following beneficial effects:
1. the three-dimensional lattice structure high-temperature wave-absorbing material has the characteristics of high temperature resistance, excellent broadband wave-absorbing performance and the like, can resist temperature of over 1000 ℃, and covers the wave-absorbing frequency range from 1 to 18GHz.
2. According to the three-dimensional lattice structure high-temperature wave-absorbing material, the radar wave energy can be obviously attenuated in a wide frequency band range by optimizing the structural parameters of the three-dimensional loss type continuous silicon carbide fiber reinforced ceramic matrix composite lattice structure and the electrical property of the silicon carbide fiber, so that the wave-absorbing performance is realized.
3. The three-dimensional lattice structure high-temperature wave-absorbing material disclosed by the invention is composed of a high-temperature-resistant material, is low in density and high in strength, and has excellent characteristics of good temperature resistance, high-temperature stability, heat insulation and the like.
4. The three-dimensional lattice structure high-temperature wave-absorbing material adopts an integrated composite material forming process, is formed in one step, and has simple process and high reliability.
Drawings
Fig. 1 is a schematic structural diagram of a three-dimensional lattice structure high-temperature wave-absorbing material in embodiment 1 of the invention.
Fig. 2 is a schematic view of the structure of a three-dimensional lattice structure fabric in example 1 of the present invention.
Fig. 3 is a reflectivity curve diagram of the three-dimensional lattice structure high-temperature wave-absorbing material in embodiment 1 of the invention.
Fig. 4 is a reflectivity curve diagram of the three-dimensional lattice structure high-temperature wave-absorbing material in embodiment 2 of the invention.
Description of the main reference numerals:
1-a lower panel of a continuous carbon fiber reinforced ceramic matrix composite, 2-a three-dimensional loss type continuous silicon carbide fiber reinforced ceramic matrix composite lattice structure and 3-an upper panel of a high resistance type continuous silicon carbide fiber reinforced ceramic matrix composite.
Detailed Description
The following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.
Example 1
A three-dimensional lattice structure high-temperature wave-absorbing material is shown in figure 1, the upper part of the material is the incident direction of electromagnetic waves, the wave-absorbing material is composed of a continuous carbon fiber reinforced ceramic matrix composite lower panel 1, a three-dimensional loss type continuous silicon carbide fiber reinforced ceramic matrix composite lattice structure 2 and a high-resistance type continuous silicon carbide fiber reinforced ceramic matrix composite upper panel 3 from bottom to top in sequence, the three layers form an integral fabric through a fiber weaving piece weaving process, the integral fabric is formed through an integral composite material process, and the ceramic matrix is silicon-oxygen-carbon. The reinforcement of the continuous carbon fiber reinforced ceramic matrix composite material is 2.5D carbon fiber fabric, and the thickness is 1mm. The silicon carbide fiber in the three-dimensional loss type continuous silicon carbide fiber reinforced ceramic matrix composite lattice structure is in a two-dimensional fabric form, the thickness direction of the two-dimensional fabric is parallel to the upper panel and the lower panel, the section of the three-dimensional lattice structure in the direction parallel to the thickness direction is square, the side length of the square is 5mm, the thickness of the two-dimensional fabric of the silicon carbide fiber is 0.25mm, and the resistivity of the silicon carbide fiber is 7.5 omega cm. The reinforcement of the upper panel of the high-resistance continuous silicon carbide fiber reinforced ceramic matrix composite material is a silicon carbide fiber two-dimensional fabric, the thickness of the reinforcement is 0.6mm, and the resistivity of the silicon carbide fiber is 5 multiplied by 10 5 Ω·cm。
The embodiment also provides a preparation method of the three-dimensional lattice structure high-temperature wave-absorbing material, which comprises the following steps:
(1) Respectively preparing a lower panel carbon fiber fabric and an upper panel silicon carbide fiber fabric which meet the design requirements;
(2) Preparing a silicon carbide fiber two-dimensional fabric with a lattice structure meeting design requirements, and cutting the silicon carbide fiber two-dimensional fabric into fabric strips by a paper cutter according to the height (50 mm) of the designed lattice structure, wherein the width of each fabric strip is the height of a lattice, and the length of each fabric strip is the width of a wave-absorbing material; according to the side length of the square of the section of the three-dimensional lattice structure, a polypropylene low-carbon-residue adhesive tape is bonded at the position of a to-be-cut opening, so that the fabric is prevented from edge scattering during cutting; cutting a notch in the width direction of the fabric, wherein the length of the notch is 0.5 times of the width of the fabric strip, and the distance of the notch is the side length of a square of the section;
(3) Dividing the wave-absorbing material into two directions of X and Y along the surface, respectively arranging the fabric strips obtained in the step (2) along the X direction and the Y direction, wherein the notches in the X direction are upward, the notches in the Y direction are downward, and the notches in the X direction and the Y direction are embedded in a one-to-one correspondence manner to assemble the lattice structure fabric as shown in figure 2;
(4) Laying a lower panel carbon fiber fabric, a lattice structure fabric and an upper panel silicon carbide fiber fabric, and sewing silicon carbide fiber yarns near the interweaving points of the fabric strips in the X direction and the interweaving points of the fabric strips in the Y direction respectively to form a whole;
(5) Taking a silicon resin alcohol solution as an impregnation solution, wherein the mass content of a precursor in the impregnation solution is 60%, impregnating, pyrolyzing and initially densifying the fiber woven piece obtained in the step (4) for 3 times by adopting a precursor impregnation and pyrolysis process, wherein the parameters of the impregnation and pyrolysis process are as follows: the vacuum impregnation time is 4h, and the pressure is-0.09 MPa; the pyrolysis temperature is 850 ℃, and the time is 1h;
(6) After the initial densification is finished, drilling drain holes with the diameter of 2mm on the lower panel, wherein the hole pitch is 10mm, so that a precursor solution can effectively enter and exit the lattice structure in the subsequent densification process;
(7) And continuing to perform densification processes for 8 times to complete the preparation of the three-dimensional lattice structure high-temperature wave-absorbing material.
The reflectivity curve of the three-dimensional lattice structure high-temperature wave-absorbing material prepared in the embodiment at 1000 ℃ is shown in figure 3, the reflectivity of the wave-absorbing material at 1 to 18GHz is basically below-15 dB, and the wave-absorbing material has excellent wave-absorbing performance.
Example 2
A three-dimensional lattice structure high-temperature wave-absorbing material is provided, which is in an electromagnetic wave incidence direction, and consists of a lower panel (the resistivity of a silicon carbide fiber is 0.05 omega cm) of a continuous silicon carbide fiber reinforced ceramic matrix composite, a three-dimensional loss type continuous silicon carbide fiber reinforced ceramic matrix composite lattice structure and an upper panel of a high-resistance type continuous silicon carbide fiber reinforced ceramic matrix composite from bottom to top in sequence, wherein the three layers form an integral fabric through a fiber weaving piece weaving process, and are formed through an integral composite material process, and the ceramic matrix is silicon carbide. The reinforcement of the continuous carbon fiber reinforced ceramic matrix composite material is sewn carbon fiber fabric with thicknessIs 2mm. The silicon carbide fiber in the three-dimensional loss type continuous silicon carbide fiber reinforced ceramic matrix composite lattice structure is in a two-dimensional fabric form, the thickness direction of the two-dimensional fabric is parallel to the upper panel and the lower panel, the section of the three-dimensional lattice structure in the direction parallel to the thickness direction is square, the side length of the square is 15mm, the thickness of the two-dimensional fabric of the silicon carbide fiber is 0.3mm, and the resistivity of the silicon carbide fiber is 1.8 omega cm. The reinforcement of the upper panel of the high-resistance continuous silicon carbide fiber reinforced ceramic matrix composite material is a silicon carbide fiber two-dimensional fabric, the thickness of the reinforcement is 0.4mm, and the resistivity of the silicon carbide fiber is 4 multiplied by 10 4 Ω·cm。
The embodiment also provides a preparation method of the three-dimensional lattice structure high-temperature wave-absorbing material, which comprises the following steps:
(1) Respectively preparing a lower panel silicon carbide fiber fabric and an upper panel silicon carbide fiber fabric which meet the design requirements;
(2) Preparing a silicon carbide fiber two-dimensional fabric with a lattice structure meeting design requirements, and cutting the silicon carbide fiber two-dimensional fabric into fabric strips by adopting laser according to the height (15 mm) of the designed lattice structure, wherein the width of each fabric strip is the height of the lattice, and the length of each fabric strip is the width of the wave-absorbing material; according to the side length of the square of the section of the three-dimensional lattice structure, a polypropylene low-carbon-residue adhesive tape is bonded at the position of a to-be-cut opening, so that the fabric is prevented from edge scattering during cutting; cutting a notch in the width direction of the fabric, wherein the length of the notch is 0.6 times of the width of the fabric strip, and the notch distance is the side length of a square of the section;
(3) Dividing the wave-absorbing material into X and Y directions along the surface, respectively arranging the fabric strips obtained in the step (2) along the X direction and the Y direction, wherein the notches in the X direction are upward, the notches in the Y direction are downward, and the notches in the X direction and the notches in the Y direction are embedded in a one-to-one correspondence manner to assemble the lattice structure fabric;
(4) The method comprises the following steps of laying a lower panel silicon carbide fiber fabric, a lattice structure fabric and an upper panel silicon carbide fiber fabric, and sewing silicon carbide fiber yarns near the interweaving points of fabric strips in the X direction and the Y direction respectively to form a whole;
(5) Taking a silicon carbide organic precursor polycarbosilane xylene solution as a dipping solution, wherein the mass content of a precursor in the dipping solution is 50%, dipping, high-temperature cracking and initial densification are carried out on the fiber woven part obtained in the step (4) for 3 times by adopting a precursor dipping and cracking process, and the parameters of the dipping and cracking process are as follows: the vacuum impregnation time is 4h, and the pressure is-0.09 MPa; the pyrolysis temperature is 900 ℃, and the time is 0.5h;
(6) After the initial densification is finished, drilling drain holes with the diameter of 3mm on the lower panel, wherein the hole pitch is 10mm, so that a precursor solution can effectively enter and exit the lattice structure in the subsequent densification process;
(7) And continuing to perform densification processes for 8 times to complete the preparation of the three-dimensional lattice structure high-temperature wave-absorbing material.
The 1000 ℃ reflectivity curve of the three-dimensional lattice structure high-temperature wave-absorbing material prepared in the embodiment is shown in figure 4, the wave-absorbing frequency band can cover 1 to 18GHz, the reflectivity of 4 to 18GHz is basically below-10 dB, and the wave-absorbing material has excellent wave-absorbing performance.
The foregoing description of specific exemplary embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (9)
1. The high-temperature wave-absorbing material with the three-dimensional lattice structure is characterized by sequentially comprising a continuous fiber reinforced ceramic matrix composite lower panel, a three-dimensional loss type continuous silicon carbide fiber reinforced ceramic matrix composite lattice structure and a high-resistance type continuous silicon carbide fiber reinforced ceramic matrix composite panel from bottom to top, wherein the continuous fiber reinforced ceramic matrix composite lower panel is a continuous carbon fiber reinforced ceramic matrix composite or a low-resistance continuous silicon carbide fiber reinforced ceramic matrix composite.
2. The three-dimensional lattice structure high-temperature wave-absorbing material according to claim 1, wherein the silicon carbide fiber in the three-dimensional lossy continuous silicon carbide fiber reinforced ceramic matrix composite lattice structure is in a two-dimensional fabric form, the thickness direction of the two-dimensional fabric is parallel to an upper panel and a lower panel, the cross section of the lattice structure in the direction parallel to the thickness direction of the two-dimensional fabric is a square, the side length of the square is 4 to 20mm, the thickness of the two-dimensional fabric of the silicon carbide fiber is 0.2 to 0.5mm, and the resistivity of the silicon carbide fiber is 1 to 20 Ω -cm.
3. The three-dimensional lattice structure high-temperature wave-absorbing material according to claim 1, wherein the reinforcement of the lower panel of the continuous fiber reinforced ceramic matrix composite is two-dimensional cloth, needle punched, sewn, 2.5D or 3D fiber fabric.
4. The three-dimensional lattice structure high-temperature wave-absorbing material according to claim 1, wherein the resistivity of the silicon carbide fiber in the low-resistance continuous silicon carbide fiber reinforced ceramic matrix composite is less than 0.1 Ω -cm.
5. The three-dimensional lattice structure high-temperature wave-absorbing material according to claim 1, wherein the reinforcement of the high-resistance continuous silicon carbide fiber reinforced ceramic matrix composite upper panel is two-dimensional cloth, needle punched, sewn, 2.5D or 3D silicon carbide fiber fabric, and the resistivity of the silicon carbide fiber is more than 1 x 10 4 Ω·cm。
6. The three-dimensional lattice structure high-temperature wave-absorbing material according to claim 1, wherein the substrates of the lower panel of the continuous fiber reinforced ceramic matrix composite, the lattice structure of the three-dimensional loss type continuous silicon carbide fiber reinforced ceramic matrix composite, and the upper panel of the high resistance type continuous silicon carbide fiber reinforced ceramic matrix composite are the same, and the substrates are silicon carbide, silicon oxygen carbon, silicon carbon nitrogen, silicon boron nitrogen, boron nitride, or silicon boron carbon nitrogen.
7. A preparation method of the three-dimensional lattice structure high-temperature wave-absorbing material as claimed in any one of claims 1 to 6, characterized by comprising the following steps:
(1) According to the height of the designed lattice structure, cutting the silicon carbide fiber two-dimensional fabric of the lattice structure meeting the design requirement into fabric strips, wherein the width of each fabric strip is the height of the lattice, and the length of each fabric strip is the width of the wave-absorbing material; according to the side length of the square of the section of the three-dimensional lattice structure, a polypropylene low-carbon-residue adhesive tape is bonded at the position of a to-be-cut opening, so that the fabric is prevented from edge scattering during cutting; cutting a notch in the width direction of the fabric, wherein the length of the notch is 0.5 to 0.6 times of the width of the fabric strip, and the notch distance is the side length of a square of the cross section;
(2) Dividing the wave-absorbing material into X and Y directions in a plane, arranging the fabric strips obtained in the step (1) along the X direction and the Y direction respectively, arranging the cuts of the fabric strips in the X direction opposite to the cuts of the fabric strips in the Y direction, and embedding the cuts in the X direction and the Y direction in a one-to-one correspondence manner to assemble the fabric with the lattice structure;
(3) Laying a lower panel fiber fabric, a lattice structure fabric and an upper panel fiber fabric, and sewing carbon fiber or silicon carbide fiber yarns near the interweaving points of the fabric strips in the X direction and the Y direction of the lattice structure fabric respectively to form an integral fiber woven part by the three layers of fabrics;
(4) Taking silicon carbide, silicon oxygen carbon, silicon carbon nitrogen, silicon boron nitrogen, boron nitride or silicon boron carbon nitrogen organic precursor solution as a dipping solution, and dipping, pyrolyzing and initially densifying the fiber woven piece obtained in the step (3) for 2 to 4 times by adopting a precursor dipping and cracking process;
(5) After the initial densification is finished, drilling liquid discharge holes with the diameter of 2 to 3mm on a lower panel, wherein the hole pitch is 5 to 20mm, so that a precursor solution can effectively enter and exit a lattice structure in the subsequent densification process;
(6) And continuously performing densification processes for 6 to 8 times to complete the preparation of the three-dimensional lattice structure high-temperature wave-absorbing material.
8. The preparation method of the three-dimensional lattice structure high-temperature wave-absorbing material according to claim 7, wherein the mass content of the precursor in the precursor dipping solution is not less than 40%; the impregnation cracking process parameters are as follows: the vacuum impregnation time is not less than 4h, and the pressure is not more than-0.09 MPa; the pyrolysis temperature is 800 to 1000 ℃, and the time is 0.5 to 1h.
9. The preparation method of the three-dimensional lattice structure high-temperature wave-absorbing material as claimed in claim 7, wherein the thickness of the polypropylene low-carbon-residue adhesive tape is 0.02-0.03mm.
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| CN116082060A (en) * | 2023-03-07 | 2023-05-09 | 西安邮电大学 | Gradient wave-absorbing composite ceramic metamaterial with oriented micropores and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116082060A (en) * | 2023-03-07 | 2023-05-09 | 西安邮电大学 | Gradient wave-absorbing composite ceramic metamaterial with oriented micropores and preparation method |
| CN116082060B (en) * | 2023-03-07 | 2024-04-12 | 西安邮电大学 | Gradient wave-absorbing composite ceramic metamaterial with oriented micropores and preparation method |
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