WO2015071916A1 - Antiballistic element - Google Patents
Antiballistic element Download PDFInfo
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- WO2015071916A1 WO2015071916A1 PCT/IT2013/000319 IT2013000319W WO2015071916A1 WO 2015071916 A1 WO2015071916 A1 WO 2015071916A1 IT 2013000319 W IT2013000319 W IT 2013000319W WO 2015071916 A1 WO2015071916 A1 WO 2015071916A1
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- WO
- WIPO (PCT)
- Prior art keywords
- antiballistic
- ceramic body
- ceramic material
- metal net
- element according
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
- F41H5/00—Armour; Armour plates
- F41H5/02—Plate construction
- F41H5/04—Plate construction composed of more than one layer
- F41H5/0414—Layered armour containing ceramic material
- F41H5/0421—Ceramic layers in combination with metal layers
Abstract
The present invention relates to an antiballistic element comprising a composite ceramic body 2 reinforced internally by at least one layer of metal net 3. The composite ceramic body is composed of a non-oxide ceramic material made on the basis of one or more components chosen from the group consisting of silicon carbide, boron carbide and silicon nitride. The metal net is of the stretch type with a three-dimensional structure.
Description
DESCRIPTION
"Antiballistic element"
Field of application
[0001] The present invention relates to an antiballistic element and an article comprising such antiballistic element .
[0002] In particular, the present invention relates to an antiballistic element for the protection of people, objects or vehicles, able to resist multiple attacks. State of the art
[0003] The use of ceramic materials to make antiballistic devices or clothing, that is to say able to resist a mechanical stress which acts in a dot-like manner is known of. Such materials are able to absorb great quantities of energy and, at the same time, have a reduced specific weight compared to the materials previously used, with obvious advantages.
[0004] However, even a ceramic material with good properties of absorbing a single attack, that is to say the impact of a bullet or other dot-like type impact, proves damaged after the first impact. This entails significant problems in that in the vast majority of cases, attacks are of a multiple type.
[0005] Consequently antiballistic materials need to resist multiple attacks, that is to say consecutive and close
impacts caused by a series of bullets.
[0006] To overcome such problem, ceramic materials have been designed formed of a plurality of units of reduced dimensions. This way, when the first bullet impacts the material, it only damages the unit hit by it in that the fracture generated by the bullet in such unit is unlikely to be propagated to the adjacent units. Consequently the material is resistant to multiple attacks.
[0007] Materials of this type are known for example from WO 91/07632 and from US 6,532,857.
[0008] However, such known materials, to achieve the desired efficiency, have a high weight per unit of surface, with obvious drawbacks in terms of transport and assembly .
[0009] To overcome the above limitations, antiballistic elements made from composite material composed of a ceramic body with ceramic particles bound in a vitreous matrix and reinforced by a plurality of layers of two dimensional metal net of the welded type have been proposed. The mesh structure of the net and the welding points of the meshes provide several anchorage points with the vitreous matrix, thus permitting a cohesive and resistant body to be achieved. The nets in fact prove closely connected to the vitreous matrix and cannot slide in relation thereto when the antiballistic element is
subjected to stresses.
[0010] The coupling between the vitreous matrix and metallic nets is essential for generating tensional states inside the ceramic body functional to the improvement of the mechanical characteristics of the composite ceramic body. The presence of a vitreous matrix ensures in fact that the ceramic body has a coefficient of thermal expansion lower than that of the metallic nets. Since the ceramic body is obtained by means of a heat treatment, upon cooling of the body, the metal net has a more marked shrinkage than the vitreous matrix. This determines a tensional state of compression which improves the characteristics of hardness and resistance to impact .
[0011] All this helps to improve the antiballistic properties of the composite material. Antiballistic properties being equal, therefore it is possible to reduce the thicknesses and then the weight compared to the prior materials.
[0012] The antiballistic elements in glass-ceramics reinforced with welded metal nets while representing a valid alternative to the previous solutions and offering a compromise between antiballistic properties and containment of costs, have several drawbacks however.
[0013] The presence of the vitreous matrix in the ceramic
body reduces the resilience of the ceramic body, making it subject to more extensive fractures when subjected to multiple strikes. This imposes an increase in the thicknesses of the ceramic body (and thus of the weight) to offset the phenomenon.
[0014] The use of welded metal nets exposes the antiballistic element to the risk of generating inner defects which are not immediately recognisable and which may reduce its antiballistic properties.
[0015] More specifically, the welding points introduce an element of non-uniformity in the metal net, with the risk of uncontrolled or, in any case, non-uniform deformations during the heat treatment step of the ceramic body. Such uncontrolled deformations may determine in the ceramic body unwanted tensional states which may negatively influence the behaviour of the composite ceramic body. In addition, the welding points may be trigger points of cracks in the ceramic material. The presence of cracks negatively influences the composite ceramic body's ability to absorb hits, as well as the efficacy of the reinforcement provided by said metal nets.
[0016] Lastly, the presence of welding points exposes the metal of the net to a greater risk of reaction with the ceramic material during the manufacturing process, leading to a consequent increase in the fragility of the
structure. This may significantly reduce the operating efficacy of the nets.
[0017] Facing the limitations described above the need therefore still exists in the anti-ballistics sector to avail of antiballistic elements in composite ceramic material which join limited weights with adequate antiballistic properties in terms of the ability to resists attacks of the multiple type.
Presentation of the invention
[0018] Such need is resolved by an antiballistic element according to claim 1 and by an article comprising such an antiballistic element according to claim 15.
[0019] In particular, such requirement is resolved by an antiballistic element comprising a composite ceramic body reinforced internally by at least one layer of metal net. The composite ceramic body is composed of a non-oxide ceramic material made on the basis of one or more components chosen from the group consisting of silicon carbide, boron carbide and silicon nitride.
[0020] The metal net is of the stretch type with a three- dimensional structure.
[0021] In particular, the metal net has a thickness of 0.1 to 6 mm and preferably of 0.5 to 1 mm. The thickness is indicated by the letter S in Figure 1.
[0022] In particular, the metal net has a mesh dimension of
3 to 30 mm and preferably 5 to 10 mm. The mesh dimension is indicated by the letter D in Figure 1.
[0023] Preferably, the metal net occupies from 1% to 10% in volume of the composite ceramic body.
[0024] According to a particular embodiment of the invention, the metal net is coated on the surface with a layer of an oxide and/or a carbide, preferably obtained by anodization, plasma spray method or painting.
[0025] According to a first particular embodiment of the present invention, the composite ceramic body is internally reinforced by a single layer of metal net.
[0026] According to a second particular embodiment of the present invention, the composite ceramic body is internally reinforced by a plurality of layers of metal net.
[0027] In particular, the composite ceramic body has a thickness of 6 mm to 30 mm. The thickness of the ceramic body is indicated by the letter H in Figure 1.
[0028] Preferably, the metal net has a coefficient of thermal expansion greater than that of the non-oxide ceramic material.
[0029] According to a particular embodiment of the invention, the composite ceramic body is composed of a non-oxide ceramic material infiltrated with silicon.
[0030] According to a further particular embodiment of the
invention, the composite ceramic body is composed of a non-oxide ceramic material obtained by sintering powders.
[0031] According to a different further particular embodiment of the invention, the composite ceramic body is composed of a non-oxide ceramic material obtained by pressing and hot sintering of powders.
[0032] Preferably, the non-oxide ceramic material has a coefficient of thermal expansion a of 2 to 5 K"1 10~6.
[0033] Preferably, the non-oxide ceramic material has a density of 2.5 to 3.25 g/cm3.
[0034] Preferably, the non-oxide ceramic material has a hardness of 15 to 35 GPa measured on the Vickers scale (HV 500g) .
[0035] Preferably, the non-oxide ceramic material has a modulus of rupture (MOR) of 250 to 750 MPa.
[0036] Preferably, the non-oxide ceramic material has a modulus of elasticity (MOE ) of 200 to 450 GPa.
Description of the drawings
[0037] Further characteristics and advantages of the present invention will be more clearly comprehensible from the description given below of its preferred and non-limiting embodiments, wherein:
[0038] - figure 1 shows a schematic cross-section view of an antiballistic element according to one embodiment of the invention, made in the form of a plate, the cross-
section being on the thickness of the plate;
[0039] - Figure 2 shows a schematic cross-section view of an antiballistic element according to a further embodiment of the invention, made in the form of a plate, the cross-section being on the thickness of the plate;
[0040] -Figure 3 shows a perspective view of an example of stretch net; and
[0041] - Figure 4 shows a photograph of the firing test results performed on an antiballistic element according to the present invention.
[0042] The elements or parts of elements common to the embodiments described below will be indicated using the same reference numerals.
Detailed description
[0043] With reference to the aforesaid drawings, reference numeral 1 globally denotes an antiballistic element according to the present invention.
[0044] According to a general embodiment of the invention, shown in the appended drawings, the antiballistic element comprises a composite ceramic body 2 reinforced internally by at least one layer of metal net 3.
[0045] The composite ceramic body 2 is composed of a non- oxide ceramic material made on the basis of one or more compounds chosen from the group consisting of silicon carbide, boron carbide and silicon nitride.
[0046] The metal net 3 is of the stretch type with a three- dimensional structure.
[0047] The non-oxide ceramic material co-operates synergically with the metal reinforcement net of the stretch type to increase the mechanical resistance of the antiballistic element, and in particular its ability to resist attacks of the multiple type.
[0048] Antiballistic performance being equal, the antiballistic elements according to the invention have reduced thicknesses compared to traditional antiballistic elements made with ceramic powders bound in a vitreous matrix reinforced by metal nets of the welded type.
[0049] In the first place the use of ceramic material instead of vitreous matrix material with ceramic powders offers a high capacity to absorb energy (related to the hardness of the material) , associated however with less fragility. The main effect is a lesser tendency to fragmentation, which translates into a greater capacity to resist multiple attacks.
[0050] The reinforcement metal net has the main effect of restraining the propagation of the fracture and thus synergically interacts with the ceramic material, further reducing the tendency to fragmentation and thus increasing the resilience of the antiballistic element.
[0051] The stretch net is a continuous structure without
joints. One example of stretch net is shown in Figure 3.
[0052] In particular, the stretch net is obtained by incision operations and cold moulding of the raw material in rolls or sheets, which gives the net a three- dimensional structure. The shape of the knives incising the sheet determines the form and breadth of the mesh.
[0053] The three-dimensional structure of the stretch net, marked by a high number of undercuts, permits a deep and even anchorage between the net and ceramic material. An extremely cohesive and resistant structure can thus be obtained in which the net cannot slide in relation to the ceramic material when the antiballistic element is subjected to stresses, in particular of the impulsive type as bullet hits.
[0054] The absence of joints and above all of welding points gives the stretch reinforcement net a high degree of structural uniformity which contributes significantly to the cohesion of the composite ceramic material.
[0055] The net may have any mesh geometry. Preferably, the geometry of the mesh is polygonal and thus provided with corners to increase the points of adhesion with the ceramic material. For example, the geometry of the mesh may be square, hexagonal or rhomboidal.
[0056] Advantageously, the metal net has a thickness of 0.1 to 6 mm and preferably of 0.5 to 1 mm.
[0057] Advantageously, the metal net has a size of mesh of 3 to 30 mm and preferably 5 to 10 mm. It has been seen that too large a net increases the propagation of the fracture and too small a net does not integrate well with the ceramic but tends to divide it.
[0058] Preferably, the metal net 3 occupies from 1% o 10% in volume of the composite ceramic body.
[0059] The stretch net 3 may be made of any metal.
Preferably, the metal net is made of a material chosen from the group consisting of iron, stainless steel, titanium, molybdenum, aluminium, copper, brass.
[0060] It is important that the stretch metal net does not alter its characteristics at the formation temperature of the non oxide ceramic material it is inserted in. In particular, the metal net must not react with the ceramic material by crystallising.
[0061] Advantageously, according to a particular embodiment of the invention, the metal net may be coated on the surface with a layer of an oxide and/or a carbide. Such coating has the function of making the metal net inert, reducing the aggressiveness of the ceramic material on said net.
[0062] The layer of oxide and/or carbide may be obtained by anodization (standard or PEO, Plasma Electrolytic Oxidation) , plasma spray method or painting.
[0063] Alternatively, in the case in which the formation process of the ceramic material envisages infiltration with silicon (as described further below) , the formation of a sacrificial layer on the surface of the metal which reacts with the silicon may be envisaged. In particular it may be envisaged:
[0064] - the use of a net of high thickness so as to sacrifice part of the metal composing it;
[0065] - coating the metal of the net with a carbon-loaded resin so as to make the coating react and delay the reaction of the metal.
[0066] Alternatively or combined with the above, it is possible to modify the heat infiltration cycle so as to reduce the reaction times of the silicon with the metal. In particular, infiltration cycles governed by pressure changes may be used as opposed to the traditional cycles governed by temperature changes.
[0067] According to a first particular embodiment of the present invention, shown schematically in Figure 1, the composite ceramic body is internally reinforced by a single layer of metal net 3 . The three-dimensional, joint-free structure of the stretch net in fact guarantees a superior reinforcement capacity to the nets traditionally used, thus making its use in a single layer as opposed to a plurality, possible.
[0068] The use of a single layer of net is also made possible by the fact that the antiballistic element 1 according to the invention may be made in smaller thicknesses to the traditional solutions in vitreous matrix with ceramic powders. As already said above, the use of non-oxide ceramic material combined with stretch net makes it possible, in fact, to obtain the same antiballistic performance as the aforesaid traditional solutions, but of reduced thicknesses.
[0069] Alternative embodiments may also be envisaged wherein the composite ceramic body is reinforced internally by a plurality of layers of metal net, as shown schematically in Figure 2.
[0070] Preferably, the composite ceramic body has a thickness of 6 mm to 30 mm.
[0071] Greater thicknesses may be envisaged for in the case in which the resistance capacity of the antiballistic element needs to be increased. In this case, by increasing the thickness of the antiballistic element, the ceramic body is preferably reinforced by a plurality of layers of metal net.
[0072] Preferably, the metal net has a coefficient of thermal expansion greater than that of the non-oxide ceramic material. This way the coupling between the ceramic material and metal net can generate tensional
states inside the composite ceramic material functional to the improvement of the mechanical characteristics of said material. Thanks to the fact that the ceramic body has a coefficient of thermal expansion lower than that of the metal net and since the ceramic material is obtained by means of a heat treatment, upon cooling of the body, the metal net has a more marked shrinkage than the ceramic material. This determines a tensional state of compression on the ceramic material which improves its characteristics of hardness and resistance to impact.
[0073] Advantageously, the non-oxide ceramic material is made by moulding starting from ceramic powders. The metal net (in a single layer or in several layers) is placed inside the mould. Filling with the ceramic powders may be performed in several steps.
[0074] In the case in which a single layer of metal net is inserted, positioned for example midway in the antiballistic element, the mould is filled with the powder for half of its weight; at this point the net is positioned and then the remaining powder placed in the mould. The subsequent forming operations of the ceramic body then take place. The powder may also be divided into unequal parts, depending on the position which the net is to have inside the ceramic body.
[0075] According to a particular embodiment of the
invention, the composite ceramic body is composed of a non-oxide ceramic material infiltrated with silicon.
[0076] The non-oxide composite ceramic body infiltrated with silicon may in particular be composed of silicon carbide, infiltrated with silicon (SiSiC) , of silicon infiltrated boron carbide (Si B4C) or of silicon infiltrated boron carbide and silicon carbide (Si B4C + SiC) .
[0077] In particular, the realisation of a non-oxide ceramic material infiltrated with silicon comprises the following operating steps:
[0078] - placing the powder (mixture of ceramic powders and binding resin, such as phenolic or siliconic) and of the net in the mould (preferably metal);
[0079] - axial pressing in a hot mould (130-150°C);
[0080] - pyrolysis at 700-900°C
[0081] - vacuum infiltration with metallic silicon at 1500 - 1680°C;
[0082] - sand-blasting where necessary to remove excess silicon;
[0083] - quality controls (dimensions, penetrating liquids, density, ... )
[0084] According to another particular embodiment of the invention, the composite ceramic body is composed of a non-oxide ceramic material obtained by sintering powders.
[0085] The non-oxide composite ceramic body obtained by sintering powders may in particular be composed of silicon carbide (SiC) , boron carbide (B4C) and silicon nitride (Si3N4) .
[0086] In particular, the realisation of a non-oxide ceramic material obtained by sintering comprises the following operating steps:
[0087] - placing the powder and the net in the mould (preferably made of metal) ;
[0088] - sintering in a controlled atmosphere;
[0089] - quality control (dimensions, penetrating liquids, density, ... )
[0090] In particular, for making silicon nitride the controlled atmosphere is of nitrogen at a temperature of 1750°C; for making silicon carbide the controlled atmosphere is of argon at a temperature of 2000 °C; for making boron carbide the controlled atmosphere is of argon at a temperature of 2200°C. For all these materials heat cycles under pressure may be used.
[0091] According to a further particular embodiment of the invention, the composite ceramic body is composed of a non-oxide ceramic material obtained by pressing and hot sintering of powders.
[0092] The non-oxide composite ceramic body obtained by pressing and hot sintering of powders may in particular
be composed of hot-pressed silicon carbide (SiC HP) , hot- pressed boron carbide (B4C HP) ) and of hot-pressed silicon nitride (Si3N4 HP) .
[0093] In particular, the realisation of a non-oxide ceramic material obtained by pressing and hot sintering of powders comprises the following operating steps:
[0094] - placing the powder and the net in the mould (preferably made of graphite) ;
[0095] - sintering and pressing in a hot press furnace (in particular at 1750°C for the nitride, 2000°C for the silicon carbide and 2200°C for the boron carbide) ;
[0096] - Sand-blasting to remove any pieces of graphite attached;
[0097] - quality control (dimensions, penetrating liquids, density, ... )
[0098] Preferably, the ceramic powders used to make the ceramic material are silicon carbide, boron carbide or silicon nitride powders, used differently and with different particle sizes depending on the production process.
[0099] For the moulding of the infiltrated ceramics, non- atomised powders are used with a particle size ranging from 100 Fepa to 1200 Fepa.
[00100] For hot moulding non-atomised powders are used with a particle size ranging from 1000 Fepa to 1500 Fepa.
[00101] For the moulding of the sintered ceramics, atomised powders are used with a particle size ranging from 100 Fepa to 1200 Fepa .
[00102] Advantageously, the metal net will have a different composition depending on the ceramic material to be obtained. For example, iron or steel for materials with low sintering temperatures and titanium for boron or silicon carbides.
[00103] In particular, during the sintering step the metal net undergoes the same heat treatment as the ceramic material and must be able to withstand it without undergoing fusion, yielding, re-crystallising phenomena or damage of various kinds. In addition, it must not create stresses or interference with the ceramic material being formed, which encounters different thermal expansions and shrinkage to said net and to the permanent shrinkage, if any, caused by the sintering.
[00104] In the case in which the anti-ballistic element to be made has an extensive surface area, metal net divided into pieces and partially overlapped may be used instead of a single piece of net, so as to allow the material a degree of freedom for shrinkage.
[00105] Preferably, the non-oxide ceramic material has a coefficient of thermal expansion a of 2 to 5 K"1 10"6.
[00106] Preferably, the non-oxide ceramic material has
a density of 2.5 to 3.25 g/cm3.
[00107] Preferably, the non-oxide ceramic material has a hardness of 15 to 35 GPa measured on the Vickers scale (HV 500g) .
[00108] Preferably, the non-oxide ceramic material has a modulus of rupture (MOR) of 250 to 750 MPa .
[00109] Preferably, the non-oxide ceramic material has a modulus of elasticity (MOE) of 200 to 450 GPa.
[00110] The Table below shows the mechanical characteristics of the ceramic materials which may preferably constitute the non-oxide ceramic body in the antiballistic element according to the present invention.
MODULUS OF VIKERS
SPECIFIC MODULUS OF ELASTICITY HARDNESS
MATERIAL WEIGHT RUPTURE MOR MOE (HV 500 g)
(g/cm3) (GPa) (MPa) (GPa)
INFILTRATED SILICON
2.95 - 3.1 210 - 250 250 - 300 24 CARBIDE
INFILTRATED BORON
2.6 - 2.8 210 - 250 250 - 300 30 CARBIDE
INFILTRATED BORON
2.72 210 - 250 250 - 300 30 CARBIDE + SILICON CARBIDE
HOT-PRESSED SILICON
3.2 440 560 28 CARBIDE
HOT-PRESSED BORON
2.5 400 440 33 CARBIDE
HOT-PRESSED SILICON
3.25 300 850 18 NITRIDE
SINTERED SILICON CARBIDE 3.1 400 530 26
SINTERED BORON CARBIDE 2.5 380 420 31
SINTERED SILICON NITRIDE 3.22 300 800 17.5
[00111] Firing tests were conducted with a manometric barrel, distance 10 m with 7.62x51 FMJ NATO ball bullets and 7.62x39 bullets with a core of soft iron, at a speed of 730 m/s on antiballistic elements according to the invention. The plates were subjected to 8 shots, fired from equidistant points approximately 100 mm from each other. Normal approval tests require the plate to resist 3-5 shots intact.
[00112] The tests gave excellent results. In fact the plates blocked all the shots without fragmenting.
[00113] The photograph in Figure 4 shows the state of an' antiballistic element made according to the invention at the end of the aforementioned tests. The plate proved intact overall and damaged only around the points of impact of the bullets, marked by the arrows C.
[00114] The present invention relates to an article for antiballistic protection comprising at least one antiballistic element as described above. The article may be used for personal protection (such as a bulletproof
vest for example) , the protection of vehicles or the protection of buildings.
[00115] The invention permits numerous advantages to be achieved, in part already described.
[00116] The antiballistic elements according to the invention are able to offer a capacity of resistance to attacks of a multiple type comparable to that of traditional antiballistic elements in glass-ceramic materials reinforced with welded net, but with reduced thicknesses. This is related mainly to the fact that the combination of the non-oxide ceramic material and stretch net determines in the antiballistic element a reduced tendency to fracture under impulsive shots.
[00117] Antiballistic performance being equal, the antiballistic elements according to the invention thus have more limited weights.
[00118] The invention is thus able to satisfy the need present in the sector to avail of antiballistic elements in composite ceramic material which join limited weights with adequate antiballistic properties in terms of the ability to resists attacks of the multiple type .
[00119] The use of joint-free and welding-free metal stretch net significantly reduces the risk of inner defects being generated inside the antiballistic element which are not immediately identifiable and thus
potentially capable of reducing the antiballistic properties thereof. This increases the reliability of the antiballistic element
[00120] The absence of welding points increases the degree of structural uniformity of the metal net, reducing the risk of uncontrolled or in any case non¬ uniform deformations during the heat treatment step of the ceramic body. The risk of generating unwanted tensional states in the ceramic body which may negatively influence the behaviour of the composite ceramic body is thus reduced.
[00121] The absence of welding points reduces the probability of the formation of cracks in the ceramic material. This positively influences the composite ceramic body's ability to absorb hits, as well as the efficacy of the reinforcement provided by said metal nets .
[00122] Lastly, the absence of welding points exposes the metal of the net to a lower risk of reaction with the ceramic material during the manufacturing process. This significantly improves the operating efficacy of the metal nets.
[00123] The invention thus conceived thereby achieves the intended objectives.
[00124] A person skilled in the art may make numerous
modifications and variations to the antiballistic elements described above so as to satisfy contingent and specific requirements, while remaining within the sphere of protection of the invention as defined by the following claims.
Claims
1. Antiballistic element comprising a composite ceramic body (2) reinforced internally by at least one layer of metal net (3), characterised in that the composite ceramic body is composed of a non-oxide ceramic material made on the basis of one or more components chosen from the group consisting of silicon carbide, boron carbide and silicon nitride and in that the metal net is of the stretch type with a three-dimensional structure.
2. Antiballistic element (1) according to claim 1, wherein said metal net has a thickness of 0.1 to 6 mm and preferably of 0.5 to 1 mm.
3. Antiballistic element according to claim 1 or 2, wherein said metal net has a mesh size of 3 to 30 mm and preferably 5 to 10 mm.
4. Antiballistic element according to claim 1, 2 or 3, wherein said metal net occupies from 1% to 10% in volume of the composite ceramic body.
5. Antiballistic element according to one or more of the previous claims, wherein said metal net is coated on the surface with a layer of an oxide and/or a carbide, preferably obtained by anodization, plasma spray method or painting.
6. Antiballistic element according to one or more of the previous claims, wherein said composite ceramic body
is internally reinforced by a single layer of metal net.
7. Antiballistic element according to one or more of the claims from 1 to 5, wherein said composite ceramic body is internally reinforced by a plurality of layers of metal net.
8. Antiballistic element according to one or more of the previous claims, wherein said composite ceramic body has a thickness of 6 mm to 30 mm.
9. Antiballistic element according to one or more of the previous claims, wherein said metal net has a coefficient of thermal expansion greater than that of the non-oxide ceramic material.
10. Antiballistic element according to one or more of the previous claims, wherein said composite ceramic body is composed of a non-oxide ceramic material infiltrated with silicon.
11. Antiballistic element according to one or more of the claims from 1 to 9, wherein said composite ceramic body is composed of a non-oxide ceramic material obtained by sintering powders.
12. Antiballistic element according to one or more of the claims from 1 to 9, wherein said composite ceramic body is composed of a non-oxide ceramic material obtained by pressing and hot sintering of powders.
13. Antiballistic element according to one or more of
the previous claims, wherein said non-oxide ceramic material has a coefficient of thermal expansion a of 2 to 5 K"1 10~6.
14. Antiballistic element according to one or more of the previous claims, wherein said non-oxide ceramic material has a density of 2.5 to 3.25 g/cm3.
15. Article for antiballistic protection comprising at least one antiballistic element according to any of the previous claims.
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| PCT/IT2013/000319 WO2015071916A1 (en) | 2013-11-14 | 2013-11-14 | Antiballistic element |
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| PCT/IT2013/000319 WO2015071916A1 (en) | 2013-11-14 | 2013-11-14 | Antiballistic element |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106446475A (en) * | 2016-11-21 | 2017-02-22 | 广州汽车集团股份有限公司 | Method and device for extracting welding point information of vehicle body in white |
| CN112729014A (en) * | 2020-12-09 | 2021-04-30 | 浙江立泰复合材料股份有限公司 | Preparation method of multi-bullet-resistant intensive-strike composite armor |
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| WO1991007632A1 (en) | 1989-11-13 | 1991-05-30 | Allied-Signal Inc. | Ballistic resistant composite armor |
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| WO2008046152A1 (en) * | 2006-10-19 | 2008-04-24 | Millenium Research Pty Ltd | Ceramic composition |
| JP2009241306A (en) * | 2008-03-28 | 2009-10-22 | Nihon Ceratec Co Ltd | Impact resistant composite member and manufacturing method thereof |
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| CN112729014A (en) * | 2020-12-09 | 2021-04-30 | 浙江立泰复合材料股份有限公司 | Preparation method of multi-bullet-resistant intensive-strike composite armor |
| CN112729014B (en) * | 2020-12-09 | 2022-08-12 | 浙江立泰复合材料股份有限公司 | Preparation method of multi-bullet-resistant intensive-strike composite armor |
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