CN115093230A - Boron carbide bulletproof ceramic with radar stealth performance and preparation method thereof - Google Patents
Boron carbide bulletproof ceramic with radar stealth performance and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a boron carbide bulletproof ceramic with radar stealth performance and a preparation method thereof, wherein the bulletproof ceramic is composed of a boron carbide ceramic layer and a quartz ceramic layer, the boron carbide ceramic layer and the quartz ceramic layer are combined by adopting a periodic wedge-shaped structure, the boron carbide ceramic layer is made of a boron carbide powder raw material, and the quartz ceramic layer is made of quartz, albite, potassium feldspar, borax, talcum powder, zinc oxide, calcium carbonate and silicon carbide; the quartz ceramic layer comprises, by mass, 50-70% of quartz, 2-4% of albite, 2-4% of potassium feldspar, 16-24% of borax, 8-12% of talcum powder, 3-5% of zinc oxide, 3-5% of calcium carbonate and 5-7% of silicon carbide. When the bulletproof ceramic is actually used, the thickness of the quartz ceramic layer, the content of silicon carbide and the structural parameters of the wedge-shaped structure are coordinated, so that the bulletproof ceramic has excellent radar stealth performance.
Description
Technical Field
The invention relates to the technical field of bulletproof stealth, in particular to boron carbide bulletproof ceramic with radar stealth performance and a preparation method thereof.
Background
Bulletproof materials are mainly divided into three types, namely soft, hard and semi-hard materials. Compared with soft and semi-hard bulletproof materials, the hard bulletproof material has the advantage of small deformation after bullet impact, is mainly used for protecting high-speed and high-energy bullets, and is mostly made of special steel or hard ceramic. The hard ceramic has comprehensive performance superior to that of special steel, and is the main development direction of bulletproof materials, wherein the boron carbide ceramic has a plurality of excellent performances such as high melting point, high hardness, low density, good thermal stability, strong chemical erosion resistance, strong neutron absorption capacity and the like, and is widely used for nuclear protection and bulletproof parts of various military targets.
With the high-tech development of modern wars, in order to avoid the discovery of military targets by radar detection technology, the bulletproof material should have certain radar stealth performance in addition to excellent bulletproof performance. Radar stealth is realized by reducing the radar scattering cross section of a target, and two measures of 'shape stealth' and 'material stealth' are mainly adopted. The invisible appearance is that the reflection intensity of electromagnetic waves in the key threat direction of the target is weakened by designing the appearance of the target so as to prevent the target from being discovered by a radar. The stealth of the material is a material which introduces incident electromagnetic waves into the material by utilizing a wave-absorbing material with proper electromagnetic parameters and then converts electromagnetic energy into heat energy to dissipate or eliminate the electromagnetic waves due to interference. The bulletproof boron carbide ceramic product has high sintering temperature and high hardness after sintering, and has radar stealth performance difficulty due to the appearance design, good conductivity and strong reflection to incident electromagnetic waves, and the simple boron carbide ceramic product cannot have radar stealth performance.
Disclosure of Invention
The invention aims to provide a boron carbide bulletproof ceramic with radar stealth performance and a preparation method thereof, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the boron carbide bulletproof ceramic is composed of a boron carbide ceramic layer and a quartz ceramic layer, wherein the boron carbide ceramic layer and the quartz ceramic layer are combined in a periodic wedge-shaped structure, the boron carbide ceramic layer is made of a boron carbide powder raw material, and the quartz ceramic layer is made of quartz, albite, potassium feldspar, borax, talcum powder, zinc oxide, calcium carbonate and silicon carbide.
Preferably, the boron carbide ceramic layer is positioned on the inner side of the application part and is used for providing the bulletproof function of the part, and the quartz ceramic layer is positioned on the outer side of the application part and is used for providing the stealth performance of the part.
Preferably, the raw materials of the quartz ceramic layer comprise 50-70% of quartz, 2-4% of albite, 2-4% of potassium feldspar, 16-24% of borax, 8-12% of talcum powder, 3-5% of zinc oxide, 3-5% of calcium carbonate and 5-7% of silicon carbide by mass.
Preferably, the preparation method of the boron carbide bulletproof ceramic comprises the following steps:
s1: mould pressing is carried out on the boron carbide powder by adopting a mould with a wedge-shaped structure to obtain a boron carbide ceramic blank, the mould pressing pressure is 120-160MPa, and the pressure maintaining time is 5-10 s;
s2: placing the boron carbide green body in a high-temperature furnace for sintering to obtain a boron carbide ceramic product with a wedge-shaped structure surface;
s3: quartz, albite, potassium feldspar, borax, talcum powder, zinc oxide and calcium carbonate are prepared according to the weight ratio of 50-70:2-4:2-4:16-24:8-12:3-5:3-5, then silicon carbide is added, and the weight percentage of the silicon carbide is controlled to be 5-7%;
s4: ball-milling the raw materials in the S3 to obtain a mixed dry material with the particle size of less than 3 microns;
s5: wetting the mixed dry material by using an ultrasonic atomizer to obtain a mixed wet material, and controlling the weight ratio of water in the mixed wet material to be 8-12%;
s6: filling the mixed wet material into a wedge-shaped structure on the surface of the boron carbide ceramic, molding to ensure that the mixed wet material is compact and is in close contact with the wedge-shaped surface, and pressing a green body formed by the mixed wet material to be 1-2mm higher than the wedge-shaped structure, wherein the molding pressure is 10-20MPa, and the pressure maintaining time is 10-20 s;
s7: placing the sample in S6 in an oven for drying at 60-80 ℃ for 150 min;
s8: and (3) placing the dried sample in a high-temperature furnace for sintering to obtain the boron carbide bulletproof ceramic with radar stealth performance.
Preferably, in S2 of the method for preparing a boron carbide-based bulletproof ceramic:
the sintering atmosphere is argon, the temperature rise rate is 5-6 ℃/min in the temperature rise stage from room temperature to 1000 ℃, and the temperature is kept at 1000 ℃ for 1 hour;
at the temperature rising stage of 1000-2175 +/-25 ℃, the temperature rising speed is 3-4 ℃/min, the temperature is preserved for 3-5 hours at 2200 ℃ at 2150-2175 ℃, and finally the temperature is cooled to the room temperature along with the furnace.
Preferably, in S8 of the method for preparing a boron carbide-based bulletproof ceramic:
the sintering atmosphere is air, the sintering temperature is 850-900 ℃, the sintering time is 30-50min, and the heating rate and the cooling rate are 6-10 ℃/min.
Compared with the prior art, the invention has the beneficial effects that: the boron carbide ceramic layer and the quartz ceramic layer adopt a wedge-shaped bonding surface, so that the bonding strength of the boron carbide ceramic layer and the quartz ceramic layer can be remarkably improved, electromagnetic waves entering the quartz ceramic layer can be effectively scattered, and the radar stealth performance of a component is improved.
In the aspect of stealth performance optimization, the radar stealth effect of the component can be adjusted by coordinating the structural parameters of the wedge-shaped structure, the thickness of the quartz ceramic layer and the content of silicon carbide. In addition, silicon carbide begins to oxidize slowly above 800 ℃, and oxidation gradually accelerates as the temperature increases. By adopting the mixture of the components in the step S3, the quartz ceramic body with the boron carbide ceramic surface in the step S6 can be melted into a viscous and continuous whole at the temperature of 750-800 ℃, so that the silicon carbide in the quartz ceramic body is prevented from contacting with air. However, when the temperature is raised to 850-. Thus, at the end of the sintering process of step S8, a transition zone with gradually increasing silicon carbide content is formed on the near surface of the quartz ceramic layer. The impedance continuous gradual change formed by the transition zone is very helpful to reduce the reflection of the quartz ceramic layer to electromagnetic waves, thereby improving the integral stealth effect of the component.
In conclusion, the preparation method has the remarkable advantages of high component yield, stable mechanical property, strong adjustability of stealth performance and the like.
Drawings
FIG. 1 is a process flow diagram of a boron carbide ballistic resistant ceramic of the present invention;
FIG. 2 is a schematic representation of a boron carbide ballistic resistant ceramic structure of the present invention;
FIG. 3 is a macroscopic view of a boron carbide ceramic of the present invention;
fig. 4 shows the result of the reflectivity test of the electromagnetic wave of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
Referring to fig. 1 to 4, the present invention provides six embodiments:
the first embodiment is as follows:
the boron carbide bulletproof ceramic with the radar stealth performance comprises a boron carbide ceramic layer and a quartz ceramic layer, wherein the boron carbide ceramic layer and the quartz ceramic layer are combined in a periodic wedge-shaped structure, the boron carbide ceramic layer is made of a boron carbide powder raw material, and the quartz ceramic layer is made of quartz, albite, potassium feldspar, borax, talcum powder, zinc oxide, calcium carbonate and silicon carbide.
The boron carbide ceramic layer is positioned on the inner side of the application part and is used for providing the bulletproof function of the application part, and the quartz ceramic layer is positioned on the outer side of the application part and is used for providing the stealth performance of the application part.
The quartz ceramic layer comprises 50-70% of quartz, 2-4% of albite, 2-4% of potassium feldspar, 16-24% of borax, 8-12% of talcum powder, 3-5% of zinc oxide, 3-5% of calcium carbonate and 5-7% of silicon carbide.
Example two:
the preparation method of the boron carbide bulletproof ceramic comprises the following steps:
s1: mould pressing is carried out on the boron carbide powder by adopting a mould with a wedge-shaped structure to obtain a boron carbide ceramic blank, the mould pressing pressure is 120-160MPa, and the pressure maintaining time is 5-10 s;
s2: placing the boron carbide blank in a high-temperature furnace for sintering, wherein the sintering atmosphere is argon, the heating rate is 5-6 ℃/min in the temperature rise stage from room temperature to 1000 ℃, and the temperature is kept at 1000 ℃ for 1 hour;
in the temperature rise stage of 1000 plus-minus 2175 ℃ with the temperature rise rate of 3-4 ℃/min, preserving the temperature for 3-5 hours at 2150 plus-minus 2200 ℃, and finally cooling to the room temperature along with the furnace to obtain the boron carbide ceramic product with the wedge-shaped structure surface;
s3: preparing quartz, albite, potassium feldspar, borax, talcum powder, zinc oxide and calcium carbonate according to the weight ratio of 50-70:2-4:2-4:16-24:8-12:3-5:3-5, and then adding silicon carbide, wherein the weight percentage of the silicon carbide is controlled to be 5-7%;
s4: ball-milling the raw materials in the S3 to obtain a mixed dry material with the particle size of less than 3 microns;
s5: wetting the mixed dry material by using an ultrasonic atomizer to obtain a mixed wet material, and controlling the weight ratio of water in the mixed wet material to be 8-12%;
s6: filling the mixed wet material into a wedge-shaped structure on the surface of the boron carbide ceramic, molding to ensure that the mixed wet material is compact and is in close contact with the wedge-shaped surface, wherein a green body formed by pressing the mixed wet material is 1-2mm higher than the wedge-shaped structure, the molding pressure is 10-20MPa, and the pressure maintaining time is 10-20 s;
s7: placing the sample in S6 in an oven for drying at 60-80 ℃ for 150 min;
s8: and sintering the dried sample in a high-temperature furnace, wherein the sintering atmosphere is air, the sintering temperature is 850-900 ℃, the sintering time is 30-50min, and the heating rate and the cooling rate are 6-10 ℃/min, so as to obtain the boron carbide bulletproof ceramic with radar stealth performance.
Example three:
a preparation method of a bulletproof ceramic with radar stealth performance comprises the following steps:
s1: carrying out die pressing on the boron carbide powder, wherein the die pressing pressure is 120MPa, the pressure maintaining time is 10s, and a die with a wedge-shaped structure is adopted during die pressing to obtain a boron carbide ceramic blank with a wedge-shaped structure surface, wherein the W value of the wedge-shaped structure is 3.5mm, and the A value is 45 degrees;
s2: putting the boron carbide ceramic blank into a high-temperature furnace for sintering to obtain a boron carbide ceramic product with a wedge-shaped structure surface, wherein the sintering atmosphere is argon, and the heating rate is 5 ℃/min at the temperature rising stage from room temperature to 1000 ℃; keeping the temperature at 1000 ℃ for 1 hour; at the temperature rise stage of 1000-2150 ℃, the temperature rise rate is 3 ℃/min, the temperature is preserved for 5h at 2150 ℃, and finally the temperature is cooled to the room temperature along with the furnace;
s3: quartz, albite, potassium feldspar, borax, talcum powder, zinc oxide and calcium carbonate are prepared according to the weight ratio of 50:2:2:16:8:3:3, and then silicon carbide is added to enable the weight percentage of the silicon carbide to be 5%;
s4: ball-milling the raw materials prepared in the step S3 to obtain a mixed dry material with the particle size of less than 3 microns;
s5: wetting the mixed dry material by using an ultrasonic atomizer to obtain a mixed wet material, and controlling the weight percentage of water in the mixed wet material to be 8%;
s6: filling the mixed wet material into a wedge-shaped structure on the surface of the boron carbide ceramic, and performing mould pressing to ensure that the mixed wet material is compact and is in close contact with the wedge-shaped surface, wherein the mixed wet material after mould pressing is 1mm higher than the wedge-shaped structure, the mould pressing pressure is 10MPa, and the pressure maintaining time is 20 s;
s7: putting the sample obtained in the step S6 into an oven to be dried, wherein the drying temperature is 60 ℃, and the drying time is 150 min;
s8: and (3) sintering the dried sample in a high-temperature furnace at 850 ℃ for 50min in air atmosphere at 10 ℃/min to obtain the bulletproof ceramic with radar stealth performance.
Example four:
a preparation method of bulletproof ceramic with radar stealth performance comprises the following steps:
s1: carrying out die pressing on the boron carbide powder, wherein the die pressing pressure is 160MPa, the pressure maintaining time is 5s, and a die with a wedge-shaped structure is adopted during die pressing to obtain a boron carbide ceramic blank with a wedge-shaped structure surface, wherein the W value of the wedge-shaped structure is 3mm, and the A value is 50 degrees;
s2: putting the boron carbide ceramic blank into a high-temperature furnace for sintering to obtain a boron carbide ceramic product with a wedge-shaped structure surface, wherein the sintering atmosphere is argon, and the heating rate is 6 ℃/min at the temperature rising stage from room temperature to 1000 ℃; keeping the temperature at 1000 ℃ for 1 hour; in the temperature rise stage of 1000-2200 ℃, the temperature rise rate is 4 ℃/min, the temperature is kept for 3h at 2200 ℃, and finally, the temperature is cooled to the room temperature along with the furnace;
s3: mixing quartz, albite, potassium feldspar, borax, talcum powder, zinc oxide and calcium carbonate according to a weight ratio of 70:4:4:24:12: 5: 5, then adding silicon carbide to ensure that the weight percentage of the silicon carbide is 7 percent;
s4: ball-milling the raw materials prepared in the step S3 to obtain a mixed dry material with the particle size of less than 3 microns;
s5: wetting the mixed dry material by using an ultrasonic atomizer to obtain a mixed wet material, and controlling the weight percentage of water in the mixed wet material to be 12%;
s6: filling the mixed wet material into a wedge-shaped structure on the surface of the boron carbide ceramic, and performing mould pressing to ensure that the mixed wet material is compact and is in close contact with the wedge-shaped surface, wherein the mixed wet material after mould pressing is 2mm higher than the wedge-shaped structure, the mould pressing pressure is 20MPa, and the pressure maintaining time is 10 s;
s7: putting the sample obtained in the step S6 into an oven to be dried, wherein the drying temperature is 80 ℃, and the drying time is 120 min;
s8: and (3) sintering the dried sample in a high-temperature furnace at 900 ℃ for 30min in the air atmosphere, wherein the heating rate and the cooling rate are both 6 ℃/min, so that the bulletproof ceramic with radar stealth performance is obtained.
Example five:
a preparation method of bulletproof ceramic with radar stealth performance comprises the following steps:
s1: carrying out die pressing on the boron carbide powder, wherein the die pressing pressure is 140MPa, the pressure maintaining time is 8s, and a die with a wedge-shaped structure is adopted during die pressing to obtain a boron carbide ceramic blank with a wedge-shaped structure surface, wherein the W value of the wedge-shaped structure is 2.5mm, and the A value is 60 degrees;
s2: putting the boron carbide ceramic blank into a high-temperature furnace for sintering to obtain a boron carbide ceramic product with a wedge-shaped structure surface, wherein the sintering atmosphere is argon, and the heating rate is 5 ℃/min at the temperature rising stage from room temperature to 1000 ℃; keeping the temperature at 1000 ℃ for 1 hour; at the temperature rise stage of 1000-2150 ℃, the temperature rise rate is 4 ℃/min, the temperature is preserved for 4h at 2150, and finally the temperature is cooled to the room temperature along with the furnace;
s3: preparing quartz, albite, potassium feldspar, borax, talcum powder, zinc oxide and calcium carbonate according to the weight ratio of 60:3:3:20:10:4:4, and then adding silicon carbide to ensure that the weight percentage of the silicon carbide is 6%;
s4: ball-milling the raw materials prepared in the step S3 to obtain a mixed dry material with the particle size of less than 3 microns;
s5: wetting the mixed dry material by using an ultrasonic atomizer to obtain a mixed wet material, and controlling the weight percentage of water in the mixed wet material to be 10%;
s6: filling the mixed wet material into a wedge-shaped structure on the surface of the boron carbide ceramic, carrying out mould pressing to ensure that the mixed wet material is compact and is in close contact with the wedge-shaped surface, wherein the height of the mixed wet material after mould pressing is 1.5mm higher than that of the wedge-shaped structure, the mould pressing pressure is 15MPa, and the pressure maintaining time is 15 s;
s7: putting the sample obtained in the step S6 into an oven to be dried, wherein the drying temperature is 70 ℃, and the drying time is 130 min;
s8: and (3) sintering the dried sample in a high-temperature furnace, wherein the sintering atmosphere is air, the sintering temperature is 880 ℃, the sintering time is 40min, and the heating and cooling rates are both 8 ℃/min, so that the bulletproof ceramic with radar stealth performance is obtained.
Example six:
a preparation method of bulletproof ceramic with radar stealth performance comprises the following steps:
s1: carrying out die pressing on the boron carbide powder, wherein the die pressing pressure is 150MPa, the pressure maintaining time is 7s, and a die with a wedge-shaped structure is adopted during die pressing to obtain a boron carbide ceramic blank body with a wedge-shaped structure surface, wherein the W value of the wedge-shaped structure is 3mm, and the A value is 55 degrees;
s2: placing the boron carbide ceramic blank into a high-temperature furnace for sintering to obtain a boron carbide ceramic product with a wedge-shaped structure surface, wherein the sintering atmosphere is argon, and the heating rate is 6 ℃/min at the temperature rise stage from room temperature to 1000 ℃; keeping the temperature at 1000 ℃ for 1 hour; in the temperature rise stage of 1000-2200 ℃, the temperature rise rate is 3 ℃/min, the temperature is kept for 4h at 2200 ℃, and finally, the temperature is cooled to the room temperature along with the furnace;
s3: quartz, albite, potassium feldspar, borax, talcum powder, zinc oxide and calcium carbonate are prepared according to the weight ratio of 60:3:3:20:10:4:4, and then silicon carbide is added to enable the weight percentage of the silicon carbide to be 7%;
s4: ball-milling the raw materials prepared in the step S3 to obtain a mixed dry material with the particle size of less than 3 microns;
s5: wetting the mixed dry material by using an ultrasonic atomizer to obtain a mixed wet material, and controlling the weight percentage of water in the mixed wet material to be 10%;
s6: filling the mixed wet material into a wedge-shaped structure on the surface of the boron carbide ceramic, and performing mould pressing to ensure that the mixed wet material is compact and is in close contact with the wedge-shaped surface, wherein the mixed wet material after mould pressing is 2mm higher than the wedge-shaped structure, the mould pressing pressure is 10MPa, and the pressure maintaining time is 20 s;
s7: putting the sample obtained in the step S6 into an oven to be dried, wherein the drying temperature is 80 ℃, and the drying time is 120 min;
s8: and (3) sintering the dried sample in a high-temperature furnace at 870 ℃ for 40min in air atmosphere at a temperature of 7 ℃/min, so as to obtain the bulletproof ceramic with radar stealth performance.
Referring to the attached drawing of the fourth specification, the reflectivity of the prepared sample to the electromagnetic wave in the frequency range of 8-18 GHz, the compact boron carbide ceramic is a strong reflector of the electromagnetic wave and can almost completely reflect the incident electromagnetic wave. As can be seen from the data in Table 1, the reflection of electromagnetic waves by the boron carbide ceramic can be obviously weakened by adopting the process disclosed by the invention, so that the boron carbide ceramic has radar stealth performance. In addition, the radar stealth performance of the bulletproof ceramic at different frequencies can be optimized by coordinating the thickness and the content of silicon carbide of the quartz ceramic layer and the structural parameters of the wedge-shaped structure.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A boron carbide bulletproof ceramic with radar stealth performance is characterized in that: the bulletproof ceramic is composed of a boron carbide ceramic layer and a quartz ceramic layer, the boron carbide ceramic layer and the quartz ceramic layer are combined in a periodic wedge-shaped structure, the boron carbide ceramic layer is made of a boron carbide powder raw material, and the quartz ceramic layer is made of quartz, albite, potassium feldspar, borax, talcum powder, zinc oxide, calcium carbonate and silicon carbide.
2. The boron carbide bulletproof ceramic with radar stealth performance as claimed in claim 1, wherein: the boron carbide ceramic layer is positioned on the inner side of the application component and is used for providing a bulletproof function of the component, and the quartz ceramic layer is positioned on the outer side of the application component and is used for providing stealth performance of the component.
3. The boron carbide bulletproof ceramic with radar stealth performance as claimed in claim 1, wherein: the quartz ceramic layer comprises, by mass, 50-70% of quartz, 2-4% of albite, 2-4% of potassium feldspar, 16-24% of borax, 8-12% of talcum powder, 3-5% of zinc oxide, 3-5% of calcium carbonate and 5-7% of silicon carbide.
4. The boron carbide bulletproof ceramic with radar stealth performance of claims 1 to 3, further comprising a preparation method of the boron carbide bulletproof ceramic, characterized in that: the preparation method of the boron carbide bulletproof ceramic comprises the following steps:
s1: mould pressing is carried out on the boron carbide powder by adopting a mould with a wedge-shaped structure to obtain a boron carbide ceramic blank, the mould pressing pressure is 120-160MPa, and the pressure maintaining time is 5-10 s;
s2: placing the boron carbide green body in a high-temperature furnace for sintering to obtain a boron carbide ceramic product with a wedge-shaped structure surface;
s3: preparing quartz, albite, potassium feldspar, borax, talcum powder, zinc oxide and calcium carbonate according to the weight ratio of 50-70:2-4:2-4:16-24:8-12:3-5:3-5, and then adding silicon carbide, wherein the weight percentage of the silicon carbide is controlled to be 5-7%;
s4: ball-milling the raw materials in the S3 to obtain a mixed dry material with the particle size of less than 3 microns;
s5: wetting the mixed dry material by using an ultrasonic atomizer to obtain a mixed wet material, and controlling the weight ratio of water in the mixed wet material to be 8-12%;
s6: filling the mixed wet material into a wedge-shaped structure on the surface of the boron carbide ceramic, molding to ensure that the mixed wet material is compact and is in close contact with the wedge-shaped surface, and pressing a green body formed by the mixed wet material to be 1-2mm higher than the wedge-shaped structure, wherein the molding pressure is 10-20MPa, and the pressure maintaining time is 10-20 s;
s7: placing the sample in S6 in an oven for drying at 60-80 ℃ for 150 min;
s8: and (3) placing the dried sample in a high-temperature furnace for sintering to obtain the boron carbide bulletproof ceramic with radar stealth performance.
5. The preparation method of the boron carbide bulletproof ceramic with radar stealth performance according to the claim 4, is characterized in that: in S2 of the method for preparing a boron carbide based bulletproof ceramic:
the sintering atmosphere is argon, the temperature rise rate is 5-6 ℃/min in the temperature rise stage from room temperature to 1000 ℃, and the temperature is kept for 1 hour at 1000 ℃;
in the temperature rise stage of 1000-2175 +/-25 ℃, the temperature rise rate is 3-4 ℃/min, the temperature is preserved for 3-5 hours at 2150-2200 ℃, and finally the temperature is cooled to the room temperature along with the furnace.
6. The preparation method of the boron carbide bulletproof ceramic with radar stealth performance according to the claim 4, is characterized in that: in S8 of the preparation method based on the boron carbide bulletproof ceramic:
the sintering atmosphere is air, the sintering temperature is 850-900 ℃, the sintering time is 30-50min, and the heating rate and the cooling rate are 6-10 ℃/min.
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