CN103979971B - Liquid-phase sintered boron carbide bulletproof material and preparation method thereof - Google Patents
Liquid-phase sintered boron carbide bulletproof material and preparation method thereof Download PDFInfo
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- CN103979971B CN103979971B CN201410139545.0A CN201410139545A CN103979971B CN 103979971 B CN103979971 B CN 103979971B CN 201410139545 A CN201410139545 A CN 201410139545A CN 103979971 B CN103979971 B CN 103979971B
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Abstract
The invention relates to a liquid-phase sintered boron carbide bulletproof material and a preparation method thereof. The bulletproof material comprises the following components by mass: 60 to 98% of boron carbide, 1 to 20% of alpha-Si3N4, 1 to 10% of alpha-SiC, 0 to 3% of carbon black and 0 to 25% of an Al-Y additive. The preparation method comprises the following steps: weighing raw materials, putting the weighed boron carbide, alpha-Si3N4, alpha-SiC and carbon black into a bowl mill and successively carrying out wet milling with deionized water as a medium and screening; then carrying out spray granulation and screening; subjecting obtained slurry to dry-pressing molding so as to prepare a green body; and finally, subjecting a processed biscuit to sintering in the presence of the Al-Y additive under the protection of argon so as to prepare the liquid-phase sintered boron carbide bulletproof material. The bulletproof material provided by the invention has volume density of 2.59 to 2.72 g/cm3 and good hardness, bending strength, breaking tenacity, elasticity modulus, etc., production cost is low, and production efficiency is high.
Description
Technical field
The present invention relates to a kind of liquid phase sintering boron carbide bulletproof material and preparation method thereof, belong to field of material synthesis technology.
Background technology
Stupalith has that intensity is high, hardness is large, high temperature resistant, anti-oxidant, high temperature creep property is little, excellent in abrasion resistance under high temperature, the excellent over-all properties such as thermal expansivity is little, density is low, it is all obviously better than metallic substance, macromolecular material and matrix material thereof in shellproof energy-absorbing effect, wear effects, kinetic effect etc., and actual application is obtained in military project protection, become one of leading greatly material of three in armor facing.The research of countries in the world to Ceramic Composite bullet resistant material is all paid much attention to, this research mainly concentrates on ceramic-metal compound, pottery-aspect such as polyester thin slice compound, steel-ceramic-steel compound, these matrix materials all belong to stratified composite macroscopically, namely there is sharp interface between layers and occur between each layer physicals sudden change stratified composite.By ceramic-metal composite material that is ceramic and metal composite, although have lot of advantages, but when internal stress increases, the destruction of material can be caused, and its density is because the existence of metal is relative to also not having advantage stupalith on armoring bullet resistant material.On the other hand, although pottery meets the requirement of bullet resistant material to lightweight with the matrix material of polyester thin slice, the inter-laminar stress that the sudden change due to material behavior causes is concentrated, is easily caused the unfavorable factors such as slabbing destruction.And pottery and the matrix material of aluminum oxide to have sintering character good, technical maturity, product size is stablized, the low and advantages such as abundant raw material of production cost, but its bulletproof ability is lower slightly, and density is comparatively large, can not meet high performance ballistic requirements.
And norbide is a kind of superhard material, have that lightweight, wear resisting property are good, resistance to chemical attack, the premium properties such as splendid ballisticperformances and high neutron absorption performance, can be applicable to bullet resistant material.Owing to there being the covalent linkage of about 93% in the crystalline structure of norbide, make the sintering of boron carbide material very difficult.Usually will could obtain finer and close boron carbide material at 2300 DEG C of hot pressed sinterings, in addition, norbide is a kind of material be highly brittle, and the fracture toughness property of pure norbide only has 2.2MPam
1/2, due to above-mentioned shortcoming, limit the widespread use of norbide.
At present, both at home and abroad to the sintering character improving boron carbide material, directly add TiB by adopting
2, SiC, C, Al
2o
3and the method for metal Ti, Al etc., make sintering temperature be reduced to 1700-1800 DEG C; Manufacturing technology for ceramic composite mainly contains hot pressed sintering and pressureless sintering technology, and these two kinds of technology exist following Railway Project: 1, hot pressed sintering norbide productive expense is high, and graphite jig is low for work-ing life, and thermosteresis is comparatively large, and the electricity charge are higher; 2, norbide hot pressing and sintering technique can only make the goods of simple shape, can not meet the demand of market to complicated shape goods; 3, hot pressed sintering norbide production efficiency is low, can not meet the demand of production in enormous quantities; 4, hot pressed sintering norbide blank size precision is poor, and following process costly; 5, pressureless sintering norbide technical performance index is low, can not meet the demand of market to high quality goods; 6, in pressureless sintering boron carbide product, pure norbide content is lower, and work-ing life is low, can not meet the need of market.As disclosed a kind of boron carbide-based composite material in Chinese patent application (publication number: CN101337816A), its ratio of quality and the number of copies is the boron carbide powder of 6-20 part, the aluminium powder of the binding agent of 1-3 part and 1-4 part or Al alloy powder are made, wherein binding agent is gasoline and the rubber dissolving in gasoline 9:1 mixing by volume, and discloses the preparation method of this matrix material.But this matrix material but drop to about 30Gpa, and complex process, cost is high.
Summary of the invention
The present invention is directed to the above-mentioned problems in the prior art, the liquid phase sintering boron carbide bulletproof material that a kind of hardness is high, folding strength is large, fracture toughness property is good is provided, and relates to the preparation method of this liquid phase sintering boron carbide bulletproof material.
For achieving the above object, by the following technical solutions, a kind of liquid phase sintering boron carbide bulletproof material, described bullet resistant material comprises the moiety of following mass percent: norbide: 60-98%, α-Si in the present invention
3n
4: 1-20%, α-SiC:1-10%, carbon black: 0-3%, Al-Y system additive: 0-25%.
The boron carbide particles that the present invention is large with hardness, density is little is matrix, utilizes particle strengthening and toughening mechanism to make bullet resistant material, and passes through moiety and the mass percent thereof of reasonable compatibility bullet resistant material, and after making sintering, the thing phase composite main manifestations of matrix material is B
4c, SiC and a small amount of BN, wherein B
4c and SiC is principal crystalline phase, the α-Si in raw material
3n
4basic disappearance.In reaction sintering process, resultant can stop growing up of matrix grain thus reach the effect of strengthening matrix.SiC is rack-like Structural assignments, is distributed in principal crystalline phase B
4around C, play connection, calking and the effect of strengthening crystal boundary.The toughening mechanism of long bar-shaped SiC crystalline phase is similar to fiber or whisker, mainly plays deviation and bridging effect to crackle.SiC is uniformly distributed in B
4around C matrix, restriction B
4the abnormal growth of C crystal grain.Newly born phase grain-size is little, because SiC is more, the new crystal boundary of generation is also more, and crystal boundary energy is higher, and the resistance that crack propagation is subject to is larger, can improve flexural strength and the fracture toughness property of bullet resistant material of the present invention.And BN is more loose, grain-boundary strength is also lower, can ensure that crack propagation is to being easy to during synusia deflect, and increases crack propagation path with consumed energy, and is aided with the toughness that the mechanism such as the bridge joint of crackle improve material.But too much BN also has negative impact to matrix material, mainly comprises: on the one hand because the hard-to-sinter of BN can cause material mesoporosity rate to increase; On the other hand because hexagonal AlN has the laminate structure of similar graphite, interlayer is molecular structure, in conjunction with more weak, therefore easily peels off the intensity that can reduce material because of it.Therefore the strict proportioning controlled between its raw material in bullet resistant material of the present invention, by the synergy between each raw material, make in material, to there is more disperse phase, when the interface cohesion of disperse phase and matrix phase is strengthened, during Materials Fracture will there is tension fracture in toughness reinforcing particle, effectively improve the toughness of material.In crack propagation process, if run into the obstruction of subparticle, namely produce particle " pinning " effect, crack propagation is hindered or deflects.In addition, produce deflection, bifurcated when the existence of tiny crack makes lead crack expand, lead crack also can be made to expand and consume more energy, therefore, bill of material of the present invention reveals higher toughness, hardness, and the ballistic performance of material is good.
In above-mentioned liquid phase sintering boron carbide bulletproof material, as preferably, described bullet resistant material comprises the moiety of following mass percent: norbide: 70-95%, α-Si
3n
4: 1-15%, α-SiC:2-8%, carbon black: 1-2%, Al-Y system additive: 3-20%.
In above-mentioned liquid phase sintering boron carbide bulletproof material, described Al-Y system additive is Y
2o
3powder and Al
2o
3powder is in mass ratio for 1-2:1 mixes.Y
2o
3with Al
2o
3both generate yttrium aluminum garnet at reaction, and (about 1850 DEG C) generate liquid phase at a lower temperature, thus reduce sintering temperature and improve product density.Aluminum oxide: yttrium oxide just can generate yttrium aluminum garnet when 0.75:1, but under this ratio under liquid phase sintering condition scaling loss relatively serious, therefore the present invention is by Y
2o
3powder and Al
2o
3powder mixes for 1-2:1 in mass ratio, the additive mixed under being added in this ratio, can improve the over-all properties of matrix material.In addition, yttrium oxide also has the effect of purification crystal boundary.
In addition, the purity of raw material and particle diameter also very important on the impact of material property, the particularly granularity of norbide and additive.The purity of selected raw material is higher, and impurity is fewer, and the grain-boundary strength of generation is higher, and the performance of material is better.Within the specific limits, the particle diameter of raw material is less, and the temperature generating liquid phase is lower, is more conducive to the sintering promoting product.If but the particle diameter of raw material is too little, easily reunites, impact is dispersed, makes weave construction uneven, thus the performance of harm product.
In above-mentioned liquid phase sintering boron carbide bulletproof material, as preferably, described Y
2o
3powder and Al
2o
3the median size of powder is 0.5-10 micron, and purity is 98-99.99%.
In above-mentioned liquid phase sintering boron carbide bulletproof material, as preferably, the purity of described norbide is 99.0-99.9%, and median size is 1-3.5 micron.If norbide particle diameter is too thick, biscuit density does not reach requirement, i.e. not easily compacting, and material internal pore is more, and crack propagation accelerates, and material property declines, especially hardness, and firing temperature is higher simultaneously, can the serious waste energy.If norbide particle diameter is too thin, easily reunite, weave construction is uneven, reduces product performance equally.
In above-mentioned liquid phase sintering boron carbide bulletproof material, as preferably, the particle diameter of described α-SiC is 1-5 micron, and purity is 99.0-99.8%.
In above-mentioned liquid phase sintering boron carbide bulletproof material, as preferably, described α-Si
3n
4particle diameter be 0.5-2 micron, purity is 99.0-99.8%.
Second object of the present invention is the preparation method providing a kind of above-mentioned liquid phase sintering boron carbide bulletproof material, and described preparation method comprises the steps:
S1, take above-mentioned liquid phase sintering boron carbide bulletproof material composi and mass percent thereof, by the norbide, the α-Si that take
3n
4, α-SiC, carbon black puts into ball mill, is that medium carries out wet-milling with deionized water, after 2h-6h by slurry good for ball milling by 120 object screen clothes;
S2, the slurry after sieving is carried out mist projection granulating by mist projection granulating tower, by the slurry after granulation by for subsequent use after 60 mesh sieves;
S3, loaded in mold cavity by the slurry after above-mentioned granulation, dry-pressing formed under the pressure of 25-100MPa, the dwell time is 5s-20s, makes green compact;
S4, according to drawing dimensional requirement, green compact to be processed; the biscuit processed is put into the saggar that the Al-Y system additive taken is housed, under argon shield, gradient increased temperature sinters to 1850-1950 DEG C; furnace cooling after insulation 1-3h, obtained liquid phase sintering boron carbide bulletproof material.
Raw material first takes by the preparation process of bullet resistant material of the present invention carries out wet-milling, wet-milling can make final material fineness evenly, the energy expenditure of unit weight product is low, do not have dust to fly field, noise is less, then by spray-dired agglomeration technique, slurry drying is directly made to become granulated powders, the operation such as devaporation, pulverizing can be economized, by dry-pressing formed after sieving, sinter finally by gradient increased temperature, the bullet resistant material of obtained better performances.
In the preparation method of above-mentioned liquid phase sintering boron carbide bulletproof material, in the process of wet-milling described in step S1, add the adhesive phenolic resin accounting for stock quality 4-16%.Resol can make binding agent on the one hand, for forming of green body provides cohesiveness, otherwise can not carry out dry-pressing formed; Resol residual on the other hand can be residual in the product with the form of carbon, i.e. recarburization, contributes to activated sintering.
In the preparation method of above-mentioned liquid phase sintering boron carbide bulletproof material, described in step S2, during mist projection granulating, the inlet temperature of prilling tower is 170-240 DEG C, and temperature out is 75-120 DEG C, take away pump rotating speed: 35-100r/min, atomizing disk rotating speed 14000r/min.
In the preparation method of above-mentioned liquid phase sintering boron carbide bulletproof material, gradient increased temperature described in step S5 is rise to 400 DEG C of insulation 20-60min with the heat-up rate of 2-5 DEG C/min from room temperature, 600 DEG C of insulation 20-30min are risen to from 400 DEG C again with the heat-up rate of 2-5 DEG C/min, then rise to 1400 DEG C of insulation 20-30min with the heat-up rate of 8-15 DEG C/min from 600 DEG C, finally rise to 1850-1950 DEG C of insulation 1h-3h with the heat-up rate of 8-20 DEG C/min from 1400 DEG C.From room temperature, temperature rise rate is more slowly and respectively 400 DEG C and 600 DEG C of insulations, mainly because make moisture and adhesive phenolic resin fully evaporate in base substrate when low temperature, thus avoid making base substrate occur a large amount of pore even cracking phenomena, cause product performance decline or scrap.
Compared with prior art, tool of the present invention has the following advantages:
1, the present invention is by the composition of reasonable compatibility liquid phase sintering bullet resistant material, the boron carbide particles that, density large with hardness is little is matrix, particle strengthening and toughening mechanism is utilized to make bullet resistant material, reduce the volume density of material, improve the ballistic performance of material, make the volume density of material reach 2.59-2.72g/cm
3, improve the hardness, bending strength, fracture toughness property, Young's modulus etc. of material, make the Shore hardness of material reach 125-135HS, folding strength reaches 550-595MPa, and fracture toughness property reaches 5.6-6.5MPam
1/2, Young's modulus reaches 450-470MPa.
2, the present invention is by liquid phase sintering bullet resistant material, reduces production cost 25-70% compared with hot pressed sintering, reduces production cost 30-60% compared with pressureless sintering, and production efficiency improves 30-160%.
3, liquid phase sintering bullet resistant material of the present invention improves the dimensional precision of material, reduces the cost of raw material and the cost of subsequent disposal.
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with specific embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Table 1: the moiety of liquid phase sintering boron carbide bulletproof material and mass percent, particle diameter, purity in embodiment 1-3
Embodiment 1
Take liquid phase sintering boron carbide bulletproof material composi and mass percent thereof described in table 1 embodiment 1, by the norbide, the α-Si that take
3n
4, α-SiC, carbon black put into ball mill, be that medium carries out wet-milling with deionized water, and add the adhesive phenolic resin accounting for stock quality 10%, after 4h by slurry good for ball milling by 120 object screen clothes;
Slurry after sieving is carried out mist projection granulating by mist projection granulating tower, during mist projection granulating, the inlet temperature of prilling tower is 200 DEG C, and temperature out is 100 DEG C, take away pump rotating speed: 80r/min, atomizing disk rotating speed 14000r/min, by the slurry after granulation by for subsequent use after 60 mesh sieves;
Loaded in mold cavity by slurry after above-mentioned granulation, dry-pressing formed under the pressure of 50MPa, the dwell time is 15s, makes green compact;
According to drawing dimensional requirement, green compact are processed; the biscuit processed is put into the saggar that the Al-Y system additive taken is housed; under argon shield; 400 DEG C of insulation 30min are risen to from room temperature with the heat-up rate of 10 DEG C/min; 600 DEG C of insulation 30min are risen to from 400 DEG C with the heat-up rate of 5 DEG C/min; 1000 DEG C of insulation 20min are risen to from 600 DEG C with the heat-up rate of 8 DEG C/min; 1900 DEG C of insulation 2h are risen to from 1000 DEG C with the heat-up rate of 7 DEG C/min; then furnace cooling, obtained liquid phase sintering boron carbide bulletproof material.
Embodiment 2
Take liquid phase sintering boron carbide bulletproof material composi and mass percent thereof described in table 1 embodiment 2, by the norbide, the α-Si that take
3n
4, α-SiC, carbon black put into ball mill, be that medium carries out wet-milling with deionized water, and add the adhesive phenolic resin accounting for stock quality 5%, after 2h by slurry good for ball milling by 120 object screen clothes;
Slurry after sieving is carried out mist projection granulating by mist projection granulating tower, during mist projection granulating, the inlet temperature of prilling tower is 170 DEG C, and temperature out is 75 DEG C, take away pump rotating speed: 35r/min, atomizing disk rotating speed 14000r/min, by the slurry after granulation by for subsequent use after 60 mesh sieves;
Loaded in mold cavity by slurry after above-mentioned granulation, dry-pressing formed under the pressure of 35MPa, the dwell time is 5s, makes green compact;
According to drawing dimensional requirement, green compact are processed; the biscuit processed is put into the saggar that the Al-Y system additive taken is housed; under argon shield; 400 DEG C of insulation 30min are risen to from room temperature with the heat-up rate of 10 DEG C/min; 600 DEG C of insulation 30min are risen to from 400 DEG C with the heat-up rate of 5 DEG C/min; 1000 DEG C of insulation 20min are risen to from 600 DEG C with the heat-up rate of 8 DEG C/min; 1850 DEG C of insulation 1h are risen to from 1000 DEG C with the heat-up rate of 7 DEG C/min; then furnace cooling, obtained liquid phase sintering boron carbide bulletproof material.
Embodiment 3
Take liquid phase sintering boron carbide bulletproof material composi and mass percent thereof described in table 1 embodiment 3, by the norbide, the α-Si that take
3n
4, α-SiC, carbon black put into ball mill, be that medium carries out wet-milling with deionized water, and add the adhesive phenolic resin accounting for stock quality 14%, after 6h by slurry good for ball milling by 120 object screen clothes;
Slurry after sieving is carried out mist projection granulating by mist projection granulating tower, during mist projection granulating, the inlet temperature of prilling tower is 240 DEG C, and temperature out is 120 DEG C, take away pump rotating speed: 100r/min, atomizing disk rotating speed 14000r/min, by the slurry after granulation by for subsequent use after 60 mesh sieves;
Loaded in mold cavity by slurry after above-mentioned granulation, dry-pressing formed under the pressure of 100MPa, the dwell time is 20s, makes green compact;
According to drawing dimensional requirement, green compact are processed; the biscuit processed is put into the saggar that the Al-Y system additive taken is housed; under argon shield; 400 DEG C of insulation 30min are risen to from room temperature with the heat-up rate of 10 DEG C/min; 600 DEG C of insulation 30min are risen to from 400 DEG C with the heat-up rate of 5 DEG C/min; 1000 DEG C of insulation 20min are risen to from 600 DEG C with the heat-up rate of 8 DEG C/min; 1950 DEG C of insulation 1h-3h are risen to from 1000 DEG C with the heat-up rate of 7 DEG C/min; then furnace cooling, obtained liquid phase sintering boron carbide bulletproof material.
Liquid phase sintering boron carbide bulletproof material obtained in embodiment of the present invention 1-3 is carried out performance test, and test result is as shown in table 2.
Table 2: the performance test results of liquid phase sintering boron carbide bulletproof material obtained in embodiment of the present invention 1-3
Wherein, the bullet resistant material for adopting single norbide to be obtained by common hot pressed sintering in comparative example.
In sum, liquid phase sintering boron carbide bulletproof material of the present invention is by the composition of reasonable compatibility liquid phase sintering bullet resistant material, reduce the volume density of material, improve the ballistic performance of material, improve the dimensional precision etc. of the hardness of material, bending strength, fracture toughness property, Young's modulus and material, and reduce the cost of raw material and the cost of subsequent disposal.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a liquid phase sintering boron carbide bulletproof material, is characterized in that, described bullet resistant material comprises the moiety of following mass percent: norbide: 60-98%, α-Si
3n
4: 1-20%, α-SiC:1-10%, carbon black: 0-3%, Al-Y system additive: 0-25%; Described Al-Y system additive is Y
2o
3powder and Al
2o
3powder mixes for 1-2:1 in mass ratio, described α-Si
3n
4particle diameter be 0.5-2 micron, purity is 99.0-99.8%; The purity of described norbide is 99.0-99.9%, and median size is 1-3.5 micron.
2. liquid phase sintering boron carbide bulletproof material according to claim 1, is characterized in that, described Y
2o
3powder and Al
2o
3the median size of powder is 0.5-10 micron, and purity is 98-99.99%.
3. liquid phase sintering boron carbide bulletproof material according to claim 1, is characterized in that, the particle diameter of described α-SiC is 1-5 micron, and purity is 99.0-99.8%.
4. a preparation method for liquid phase sintering boron carbide bulletproof material, is characterized in that, described preparation method comprises the steps:
S1, take the material composi of liquid phase sintering boron carbide bulletproof as described in the appended claim 1 and mass percent thereof, by the norbide, the α-Si that take
3n
4, α-SiC, carbon black puts into ball mill, is that medium carries out wet-milling with deionized water, after 2h-6h by slurry good for ball milling by 120 object screen clothes;
S2, the slurry after sieving is carried out mist projection granulating by mist projection granulating tower, by the slurry after granulation by for subsequent use after 60 mesh sieves;
S3, loaded in mold cavity by the slurry after above-mentioned granulation, dry-pressing formed under the pressure of 25-100MPa, the dwell time is 5s-20s, makes green compact;
S4, according to drawing dimensional requirement, green compact to be processed, the biscuit processed is put into the saggar that the Al-Y system additive taken is housed, under argon shield, gradient increased temperature sinters to 1850-1950 DEG C, furnace cooling after insulation 1-3h, obtained liquid phase sintering boron carbide bulletproof material; Described gradient increased temperature is rise to 400 DEG C of insulation 20-60min with the heat-up rate of 2-5 DEG C/min from room temperature, 600 DEG C of insulation 20-30min are risen to from 400 DEG C again with the heat-up rate of 2-5 DEG C/min, then rise to 1400 DEG C of insulation 20-30min with the heat-up rate of 8-15 DEG C/min from 600 DEG C, finally rise to 1850-1950 DEG C of insulation 1h-3h with the heat-up rate of 8-20 DEG C/min from 1400 DEG C.
5. the preparation method of the material of liquid phase sintering boron carbide bulletproof according to claim 4, is characterized in that, adds the adhesive phenolic resin accounting for stock quality 4-16% in the process of wet-milling described in step S1.
6. the preparation method of the material of liquid phase sintering boron carbide bulletproof according to claim 4, it is characterized in that, described in step S2, during mist projection granulating, the inlet temperature of prilling tower is 170-240 DEG C, and temperature out is 75-120 DEG C, take away pump rotating speed: 35-100r/min, atomizing disk rotating speed 14000r/min.
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| CN105329896A (en) * | 2015-11-19 | 2016-02-17 | 桐城市明丽碳化硼制品有限公司 | Novel process for preparing boron carbide and boron carbide elements |
| CN106242579B (en) * | 2016-07-29 | 2018-09-07 | 中山市北斗星导航创新应用研究院 | A kind of bulletproof ceramic and preparation method thereof |
| CN106380201B (en) * | 2016-08-28 | 2019-06-14 | 大连正兴磨料有限公司 | A method of preparing special-shaped boron carbide ceramics |
| CN107721430A (en) * | 2017-09-30 | 2018-02-23 | 浙江立泰复合材料股份有限公司 | A kind of preparation method of the Boral alloy composite plate with crack arrest through hole |
| CN108640687B (en) * | 2018-05-29 | 2021-02-05 | 北京理工大学 | Boron carbide/silicon carbide composite ceramic and preparation method thereof |
| CN108751996A (en) * | 2018-06-29 | 2018-11-06 | 南京理工大学 | A kind of the boron carbide ceramics material and its plasma agglomeration preparation process of graphene toughening |
| CN108911753A (en) * | 2018-08-26 | 2018-11-30 | 扬州北方三山工业陶瓷有限公司 | A kind of high tenacity pressureless sintering boron carbide ceramics preparation method |
| CN109665847B (en) * | 2019-03-06 | 2021-05-28 | 东北大学 | Fully-compact boron carbide ceramic composite material and preparation method thereof |
| CN110041076B (en) * | 2019-05-28 | 2021-08-17 | 山东理工大学 | Large-thickness light laminated armor ceramic and preparation method thereof |
| CN111231137B (en) * | 2020-03-06 | 2022-06-03 | 中国工程物理研究院机械制造工艺研究所 | Cutting processing system and method for boron carbide-based ceramic material |
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