CN103979971A - 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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- CN103979971A CN103979971A CN201410139545.0A CN201410139545A CN103979971A CN 103979971 A CN103979971 A CN 103979971A CN 201410139545 A CN201410139545 A CN 201410139545A CN 103979971 A CN103979971 A CN 103979971A
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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 norbide bullet resistant material and preparation method thereof, belong to field of material synthesis technology.
Background technology
The good over-all propertieies such as 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, thermal expansivity is little, density is low, it is all obviously better than metallic substance, macromolecular material and matrix material thereof at aspects such as shellproof energy-absorbing effect, wear effects, kinetic effects, and obtained actual application in military project protection, become one of greatly leading material of three in armor facing.Countries in the world are all paid much attention to the research of Ceramic Composite bullet resistant material, this research mainly concentrates on the aspects such as ceramic-metal is compound, pottery-polyester thin slice is compound, steel-ceramic-steel is compound, these matrix materials all belong to the stratified composite in macroscopic view, have between layers the stratified composite that physicals sudden change occurs between sharp interface and each layer.The ceramic-metal composite material being formed by pottery and metal composite, although there is lot of advantages, but in the time that internal stress increases, can cause the destruction of material, and its density due to the relative stupalith of existence of metal for not having advantage on armoring bullet resistant material yet.On the other hand, although pottery meets the requirement of bullet resistant material to lightweight with the matrix material of polyester thin slice, because the unfavorable factors such as slabbing destruction are concentrated, easily caused to the inter-laminar stress that the sudden change of material behavior causes.And that pottery and the matrix material of aluminum oxide have sintering character is good, technical maturity, the advantage such as product size is stable, the low and abundant raw material of production cost, but its bulletproof ability is lower slightly, and density is larger, can not meet high performance ballistic requirements.
And norbide is a kind of superhard material, have that lightweight, wear resisting property are good, a resistance to chemical attack, the splendid premium properties such as ballisticperformances and high seed absorptive character, can be applicable to bullet resistant material.In crystalline structure due to norbide, there is about 93% covalent linkage, make the sintering of boron carbide material very difficult.Conventionally 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 being highly brittle, and the fracture toughness property of pure norbide only has 2.2MPam
1/2, due to above-mentioned shortcoming, limited the widespread use of norbide.
At present, both at home and abroad to improving the sintering character of 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; Mainly contain hot pressed sintering and pressureless sintering technology for the manufacturing technology of ceramic composite, there is following several problem in these two kinds of technology: 1, hot pressed sintering norbide productive expense is high, and graphite jig is low work-ing life, and thermosteresis is larger, and the electricity charge are higher; 2, norbide hot pressing and sintering technique can only be made 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 expense is high; 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 that boron carbide powder, the binding agent of 1-3 part and aluminium powder or the Al alloy powder of 1-4 part of 6-20 part made, wherein binding agent is gasoline and the rubber that dissolves in gasoline 9:1 mixing by volume, and discloses the preparation method of this matrix material.But but dropping to about 30Gpa of this matrix material, 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 norbide that a kind of hardness is high, folding strength is large, fracture toughness property is good bullet resistant material is provided, and relate to the preparation method of this liquid phase sintering norbide bullet resistant material.
For achieving the above object, the present invention by the following technical solutions, a kind of liquid phase sintering norbide bullet resistant material, 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 is additive: 0-25%.
The boron carbide particles that the present invention is large taking hardness, density is little is matrix, utilizes particle strengthening and toughening mechanism to make bullet resistant material, and by moiety and the mass percent thereof of reasonable compatibility bullet resistant material, and making the thing phase composite main manifestations of matrix material after sintering is B
4c, SiC and a small amount of BN, wherein B
4c and SiC are principal crystalline phases, the α-Si in raw material
3n
4basic disappearance.In reaction sintering process, thereby resultant can stop growing up of matrix grain to reach the effect of strengthening matrix.SiC is frame shape structure and arranges, and 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, and crackle is mainly played to deviation and bridging effect.SiC is uniformly distributed in B
4around C matrix, restriction B
4the abnormal growth of C crystal grain.New looks 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 just 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 crack propagation to synusia time, is easy to deflect, and increases crack propagation path with consumed energy, and the mechanism such as bridge joint that is aided with crackle improves the toughness of material.But too much BN also has negative impact to matrix material, mainly comprises: increase because the hard-to-sinter of BN can cause material mesoporosity rate on the one hand; The laminate structure due to six side BN on the other hand with similar graphite, interlayer is molecular structure, a little less than, therefore easily peel off the intensity that can reduce material because of it.Therefore the strict proportioning of controlling between its raw material in bullet resistant material of the present invention, by the synergy between each raw material, make to have more disperse phase in material, when disperse phase is combined reinforcement with the interface of matrix phase, when 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, produce particle " pinning " effect, crack propagation is hindered or deflect.In addition, the existence of tiny crack produces deflection, bifurcated while making main crack propagation, also can make the more energy of main crack propagation consumption, and 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 norbide bullet resistant 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 is additive: 3-20%.
In above-mentioned liquid phase sintering norbide bullet resistant material, described Al-Y is that additive is Y
2o
3powder and Al
2o
3powder is in mass ratio for 1-2:1 mixes.Y
2o
3with Al
2o
3both react generation yttrium aluminum garnet, and (1850 DEG C of left and right) generates liquid phase at a lower temperature, thereby reduce sintering temperature and improve product density.Aluminum oxide: yttrium oxide just can generate yttrium aluminum garnet in the time of 0.75:1, still under this ratio, under liquid phase sintering condition, scaling loss is more serious, and therefore the present invention is by Y
2o
3powder and Al
2o
3powder mixes for 1-2:1 in mass ratio, is added in the additive mixing under this ratio, can improve the over-all properties of matrix material.In addition, yttrium oxide also has the effect that purifies crystal boundary.
In addition, the purity of raw material and particle diameter are also very important on the impact of material property, particularly the granularity of norbide and additive.The purity of selected raw material is higher, and impurity is just fewer, and the grain-boundary strength of generation is just higher, and the performance of material is just better.Within the specific limits, the particle diameter of raw material is less, and the temperature that generates liquid phase is lower, is more conducive to promote the sintering of product.If but the particle diameter of raw material is too little, easily reunite, impact is dispersed, makes weave construction inhomogeneous, thus the performance of harm product.
In above-mentioned liquid phase sintering norbide bullet resistant 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 norbide bullet resistant 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, is difficult for 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 to reunite, weave construction is inhomogeneous, reduces equally product performance.
In above-mentioned liquid phase sintering norbide bullet resistant 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 norbide bullet resistant 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 to provide a kind of preparation method of above-mentioned liquid phase sintering norbide bullet resistant material, and described preparation method comprises the steps:
S1, take above-mentioned liquid phase sintering norbide bullet resistant material moiety and mass percent thereof, by the norbide taking, α-Si
3n
4, α-SiC, carbon black put into ball mill, carries out wet-milling taking deionized water as medium, after 2h-6h by slurry good ball milling by 120 object screen clothes;
S2, the slurry after sieving is carried out to mist projection granulating by mist projection granulating tower, by the slurry after granulation by for subsequent use after 60 mesh sieves;
S3, the slurry after above-mentioned granulation is packed in mold cavity, 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 are processed; the biscuit processing is put into the saggar that the Al-Y taking is additive is housed, and under argon shield, gradient increased temperature carries out sintering to 1850-1950 DEG C; furnace cooling after insulation 1-3h, makes liquid phase sintering norbide bullet resistant material.
The preparation process of bullet resistant material of the present invention first takes raw material and carries out wet-milling, wet-milling can make final material fineness evenly, the energy expenditure of unit weight product is low, there is no that dust flies, noise is less, then by spray-dired agglomeration technique, directly make slurry drying become granulated powders, can economize the operation such as devaporation, pulverizing, after sieving, by dry-pressing formed, finally carry out sintering by gradient increased temperature, make the bullet resistant material of better performances.
In the preparation method of above-mentioned liquid phase sintering norbide bullet resistant material, in the process of wet-milling described in step S1, add the adhesive phenolic resin that accounts 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; Residual resol can remain in product with the form of carbon on the other hand, i.e. recarburization, contributes to activated sintering.
In the preparation method of above-mentioned liquid phase sintering norbide bullet resistant material, when mist projection granulating described in step S2, 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 norbide bullet resistant material, gradient increased temperature described in step S5 is incubated 20-60min for the heat-up rate with 2-5 DEG C/min rises to 400 DEG C from room temperature, rise to 600 DEG C of insulation 20-30min with the heat-up rate of 2-5 DEG C/min from 400 DEG C again, then rise to 1400 DEG C with the heat-up rate of 8-15 DEG C/min from 600 DEG C and be incubated 20-30min, 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.Start temperature rise rate more slowly and respectively 400 DEG C and 600 DEG C of insulations from room temperature, mainly because make moisture and adhesive phenolic resin fully evaporate in base substrate in the time of low temperature, thereby avoid making base substrate to occur even cracking phenomena of a large amount of pores, 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 large taking hardness, density is little is matrix, utilize particle strengthening and toughening mechanism to make bullet resistant material, reduce the volume density of material, the ballistic performance that improves material, makes the volume density of material reach 2.59-2.72g/cm
3, improve the hardness, bending strength, fracture toughness property, Young's modulus of material etc., 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, the 25-70% that reduces production costs compared with hot pressed sintering, and the 30-60% that reduces production costs compared with pressureless sintering, production efficiency improves 30-160%.
3, liquid phase sintering bullet resistant material of the present invention has improved the dimensional precision of material, has reduced 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 clearer, 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, is not intended to limit the present invention.
Table 1: the moiety of liquid phase sintering norbide bullet resistant material and mass percent thereof, particle diameter, purity in embodiment 1-3
Embodiment 1
Take the bullet resistant material moiety of liquid phase sintering norbide described in table 1 embodiment 1 and mass percent thereof, by the norbide taking, α-Si
3n
4, α-SiC, carbon black put into ball mill, carry out wet-milling taking deionized water as medium, and add the adhesive phenolic resin that accounts for stock quality 10%, after 4h by slurry good ball milling by 120 object screen clothes;
Slurry after sieving is carried out to mist projection granulating by mist projection granulating tower, when 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;
Slurry after above-mentioned granulation is packed in mold cavity, and 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 processing is put into the saggar that the Al-Y taking is additive is housed; under argon shield; heat-up rate with 10 DEG C/min rises to 400 DEG C of insulation 30min from room temperature; heat-up rate with 5 DEG C/min rises to 600 DEG C of insulation 30min from 400 DEG C; heat-up rate with 8 DEG C/min rises to 1000 DEG C of insulation 20min from 600 DEG C; heat-up rate with 7 DEG C/min rises to 1900 DEG C of insulation 2h from 1000 DEG C; then furnace cooling, makes liquid phase sintering norbide bullet resistant material.
Embodiment 2
Take the bullet resistant material moiety of liquid phase sintering norbide described in table 1 embodiment 2 and mass percent thereof, by the norbide taking, α-Si
3n
4, α-SiC, carbon black put into ball mill, carry out wet-milling taking deionized water as medium, and add the adhesive phenolic resin that accounts for stock quality 5%, after 2h by slurry good ball milling by 120 object screen clothes;
Slurry after sieving is carried out to mist projection granulating by mist projection granulating tower, when 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;
Slurry after above-mentioned granulation is packed in mold cavity, and 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 processing is put into the saggar that the Al-Y taking is additive is housed; under argon shield; heat-up rate with 10 DEG C/min rises to 400 DEG C of insulation 30min from room temperature; heat-up rate with 5 DEG C/min rises to 600 DEG C of insulation 30min from 400 DEG C; heat-up rate with 8 DEG C/min rises to 1000 DEG C of insulation 20min from 600 DEG C; heat-up rate with 7 DEG C/min rises to 1850 DEG C of insulation 1h from 1000 DEG C; then furnace cooling, makes liquid phase sintering norbide bullet resistant material.
Embodiment 3
Take the bullet resistant material moiety of liquid phase sintering norbide described in table 1 embodiment 3 and mass percent thereof, by the norbide taking, α-Si
3n
4, α-SiC, carbon black put into ball mill, carry out wet-milling taking deionized water as medium, and add the adhesive phenolic resin that accounts for stock quality 14%, after 6h by slurry good ball milling by 120 object screen clothes;
Slurry after sieving is carried out to mist projection granulating by mist projection granulating tower, when 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;
Slurry after above-mentioned granulation is packed in mold cavity, and 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 processing is put into the saggar that the Al-Y taking is additive is housed; under argon shield; heat-up rate with 10 DEG C/min rises to 400 DEG C of insulation 30min from room temperature; heat-up rate with 5 DEG C/min rises to 600 DEG C of insulation 30min from 400 DEG C; heat-up rate with 8 DEG C/min rises to 1000 DEG C of insulation 20min from 600 DEG C; heat-up rate with 7 DEG C/min rises to 1950 DEG C of insulation 1h-3h from 1000 DEG C; then furnace cooling, makes liquid phase sintering norbide bullet resistant material.
The liquid phase sintering norbide bullet resistant material making in embodiment of the present invention 1-3 is carried out to performance test, and test result is as shown in table 2.
Table 2: the performance test results of the liquid phase sintering norbide bullet resistant material making in embodiment of the present invention 1-3
Wherein, the bullet resistant material for adopting single norbide to make by common hot pressed sintering in comparative example.
In sum, liquid phase sintering norbide bullet resistant 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 of hardness, bending strength, fracture toughness property, Young's modulus and the material of material etc., and reduced 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 of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a liquid phase sintering norbide bullet resistant 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 is additive: 0-25%.
2. liquid phase sintering norbide bullet resistant material according to claim 1, is characterized in that, described Al-Y is that additive is Y
2o
3powder and Al
2o
3powder is in mass ratio for 1-2:1 mixes.
3. liquid phase sintering norbide bullet resistant material according to claim 1 and 2, 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%.
4. liquid phase sintering norbide bullet resistant material according to claim 1, is characterized in that, the purity of described norbide is 99.0-99.9%, and median size is 1-3.5 micron.
5. liquid phase sintering norbide bullet resistant 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%.
6. liquid phase sintering norbide bullet resistant material according to claim 1, is characterized in that described α-Si
3n
4particle diameter be 0.5-2 micron, purity is 99.0-99.8%.
7. a preparation method for liquid phase sintering norbide bullet resistant material, is characterized in that, described preparation method comprises the steps:
S1, take liquid phase sintering norbide bullet resistant material moiety and mass percent thereof described in claim 1, by the norbide taking, α-Si
3n
4, α-SiC, carbon black put into ball mill, carries out wet-milling taking deionized water as medium, after 2h-6h by slurry good ball milling by 120 object screen clothes;
S2, the slurry after sieving is carried out to mist projection granulating by mist projection granulating tower, by the slurry after granulation by for subsequent use after 60 mesh sieves;
S3, the slurry after above-mentioned granulation is packed in mold cavity, 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 are processed; the biscuit processing is put into the saggar that the Al-Y taking is additive is housed, and under argon shield, gradient increased temperature carries out sintering to 1850-1950 DEG C; furnace cooling after insulation 1-3h, makes liquid phase sintering norbide bullet resistant material.
8. the preparation method of liquid phase sintering norbide bullet resistant material according to claim 7, is characterized in that, in the process of wet-milling described in step S1, adds the adhesive phenolic resin that accounts for stock quality 4-16%.
9. the preparation method of liquid phase sintering norbide bullet resistant material according to claim 7, it is characterized in that, when mist projection granulating described in step S2, 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.
10. the preparation method of liquid phase sintering norbide bullet resistant material according to claim 7, it is characterized in that, gradient increased temperature described in step S5 is incubated 20-60min for the heat-up rate with 2-5 DEG C/min rises to 400 DEG C from room temperature, rise to 600 DEG C of insulation 20-30min with the heat-up rate of 2-5 DEG C/min from 400 DEG C again, then rise to 1400 DEG C with the heat-up rate of 8-15 DEG C/min from 600 DEG C and be incubated 20-30min, 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.
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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 |
| CN106242579A (en) * | 2016-07-29 | 2016-12-21 | 中山市北斗星导航创新应用研究院 | A kind of bulletproof ceramic and preparation method thereof |
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| CN106242579A (en) * | 2016-07-29 | 2016-12-21 | 中山市北斗星导航创新应用研究院 | A kind of bulletproof ceramic and preparation method thereof |
| 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 |
| CN106380201A (en) * | 2016-08-28 | 2017-02-08 | 大连正兴磨料有限公司 | Method for preparing specially-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 |
| CN109665847A (en) * | 2019-03-06 | 2019-04-23 | 东北大学 | A kind of complete fine and close boron carbide ceramic composite and 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 |
| CN110041076A (en) * | 2019-05-28 | 2019-07-23 | 山东理工大学 | A kind of big thickness lightweight layer-built armor ceramics 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 |
| CN111231137A (en) * | 2020-03-06 | 2020-06-05 | 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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