A flame-cutting resistant composite coated bulletproof steel plate

Abstract

The invention discloses a flame-cutting resistant composite coating bulletproof steel plate, comprising a flame-retardant layer, a thermal barrier layer, a bullet-proof steel plate layer and a thermal insulation layer which are overlapped in sequence. Compared with the prior art, the invention ensures the structural strength of the bullet-proof steel plate layer, forms a thermal insulation layer through the flame-retardant layer, improves the flame-cutting resistant capability of the bullet-proof steel plate, reduces the influence of high temperature and flame on the bullet-proof steel plate, and reduces the thermal conductivity of the bullet-proof steel plate through the thermal barrier layer. The flame-retardant layer, the thermal barrier layer and the thermal insulation layer cooperate to enhance the flame-cutting resistant capability of the bullet-proof steel plate.

Description

Technical Field

[0001] The invention relates to the technical field of bulletproof steel plates, and in particular to a flame-cutting-resistant composite-coated bulletproof steel plate. Background Art

[0002] Bulletproof steel plates are generally used in bulletproof and explosion-proof projects, such as bulletproof doors, bulletproof helmets, bulletproof vests, bulletproof shields; bank counters, confidential safes; riot control vehicles, bulletproof cash transporters, armored personnel carriers, tanks, submarines, landing craft, anti-smuggling boats, helicopters, etc.

[0003] The main technical improvements of bulletproof steel plates are in their structural strength and thickness. Generally speaking, the thicker the steel plate, the greater its structural strength. However, a bulletproof steel plate that is too thick is inconvenient to use. Therefore, the main focus now is to reduce its thickness while ensuring its structural strength. However, the composite properties of bulletproof steel plates are relatively poor, such as fire resistance and thermal conductivity. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a flame-cutting resistant composite coated bulletproof steel plate to solve the problem in the prior art that the existing bulletproof steel plates have relatively poor composite properties such as fire resistance and thermal conductivity.

[0005] To achieve the above object, the present invention adopts the following technical solution: a flame-cutting resistant composite coated bulletproof steel plate, comprising a flame-retardant layer, a thermal barrier layer, a bulletproof steel plate layer and a heat-insulating layer overlapped in sequence.

[0006] Compared with the prior art, the present invention has the following beneficial effects:

[0007] The flame cutting resistant composite coated bulletproof steel plate ensures its structural strength through the bulletproof steel plate layer, and then forms a heat insulating layer through the flame retardant layer to improve its flame cutting resistance, and the heat insulating layer reduces the degree of influence of high temperature and flame, and then reduces its thermal conductivity efficiency through the thermal barrier layer; the flame cutting resistance performance can be mutually enhanced through the cooperation of the flame retardant layer, the thermal barrier layer and the heat insulating layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0009] The present invention is further described in detail below through specific embodiments:

[0010] The reference numerals in the drawings of the specification include: flame retardant layer 1 , thermal barrier layer 2 , bulletproof steel plate layer 3 , heat insulation layer 4 , main body layer 31 , and attachment protrusion 32 .

[0011] Example 1

[0012] refer to Figure 1 As shown: A flame-cutting resistant composite coated bulletproof steel plate, comprising a flame-retardant layer 1, a thermal barrier layer 2, a bulletproof steel plate layer 3 and a heat-insulating layer 4 which are overlapped in sequence.

[0013] In order to enhance the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3, the adopted bulletproof steel plate layer 3 includes a main body layer 31 and an attachment reinforcement member arranged on two surfaces of the main body layer 31, and the attachment reinforcement member includes a plurality of attachment grooves uniformly distributed on the main body layer 31 and an attachment protrusion 32 arranged between two adjacent attachment grooves; the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3 is improved by increasing the contact area between them, and at the same time, the longitudinal tensile force of the contact surface between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3 can be increased; wherein, the attachment protrusion 32 includes a connecting column integrally formed with the main body layer 31 and a limiting block integrally formed with the connecting column, the limiting block and the main body layer 31 are located at different ends of the connecting column, and the diameter of the connecting column is smaller than the block diameter of the limiting block; through the structural design of the limiting block, it can produce a certain compression effect on the thermal barrier layer 2 or the thermal insulation layer 4, further improving the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3.

[0014] The specific parameters and preparation method of the flame cutting resistant composite coated bulletproof steel plate are as follows:

[0015] 1. A bulletproof steel plate layer 3 with a body layer 31 having a thickness of 5 mm is selected, and the surface of the bulletproof steel plate layer 3 is first roughened by sandblasting to improve the adhesion of the surface of the bulletproof steel plate layer 3, and then a heat insulating agent whose main component is CrC-25NiCr ceramic is evenly sprayed on the surface of the bulletproof steel plate layer 3 by plasma spraying technology to form a thermal barrier layer 2, and the thickness of the thermal barrier layer 2 is 0.5 mm;

[0016] 2. Evenly mix 75% by weight of expanded graphite and inorganic adhesive to form a flame retardant, and then evenly spray the flame retardant on the surface of the cured thermal barrier layer 2 by compressed air high-pressure spraying to form a flame retardant layer 1. The thickness of the cured flame retardant layer 1 is 1.2 mm;

[0017] 3. 80% by weight of lightweight heat-resistant ceramic powder is uniformly mixed with an inorganic adhesive to form a thermal insulation agent, and then the thermal insulation agent is evenly sprayed on a surface of the elastic steel plate layer 3 away from the thermal barrier layer 2 by compressed air high-pressure spraying to form a thermal insulation layer 4. The thickness of the thermal insulation layer 4 after curing is 1 mm.

[0018] Example 2

[0019] refer to Figure 1 As shown: A flame-cutting resistant composite coated bulletproof steel plate, comprising a flame-retardant layer 1, a thermal barrier layer 2, a bulletproof steel plate layer 3 and a heat-insulating layer 4 which are overlapped in sequence.

[0020] In order to enhance the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3, the adopted bulletproof steel plate layer 3 includes a main body layer 31 and an attachment reinforcement member arranged on two surfaces of the main body layer 31, and the attachment reinforcement member includes a plurality of attachment grooves uniformly distributed on the main body layer 31 and an attachment protrusion 32 arranged between two adjacent attachment grooves; the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3 is improved by increasing the contact area between them, and at the same time, the longitudinal tensile force of the contact surface between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3 can be increased; wherein, the attachment protrusion 32 includes a connecting column integrally formed with the main body layer 31 and a limiting block integrally formed with the connecting column, the limiting block and the main body layer 31 are located at different ends of the connecting column, and the diameter of the connecting column is smaller than the block diameter of the limiting block; through the structural design of the limiting block, it can produce a certain compression effect on the thermal barrier layer 2 or the thermal insulation layer 4, further improving the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3.

[0021] The specific parameters and preparation method of the flame cutting resistant composite coated bulletproof steel plate are as follows:

[0022] 1. A bulletproof steel plate layer 3 having a body layer 31 with a thickness of 2.4 mm is selected, and the surface of the bulletproof steel plate layer 3 is first roughened by sandblasting to improve the adhesion of the surface of the bulletproof steel plate layer 3, and then a heat insulating agent whose main component is CrC-25NiCr ceramic is evenly sprayed on the surface of the bulletproof steel plate layer 3 by plasma spraying technology to form a thermal barrier layer 2, and the thickness of the thermal barrier layer 2 is 0.2 mm;

[0023] 2. Evenly mix 75% by weight of expanded graphite and inorganic adhesive to form a flame retardant, and then evenly spray the flame retardant on the surface of the cured thermal barrier layer 2 by compressed air high-pressure spraying to form a flame retardant layer 1. The thickness of the cured flame retardant layer 1 is 0.5 mm;

[0024] 3. Evenly mix 75% by weight of lightweight heat-resistant ceramic powder and inorganic adhesive to form a thermal insulation agent, and then use compressed air high-pressure spraying to evenly spray the thermal insulation agent on a surface of the elastic steel plate layer 3 away from the thermal barrier layer 2 to form a thermal insulation layer 4. The thickness of the thermal insulation layer 4 after curing is 0.5 mm.

[0025] Example 3

[0026] refer to Figure 1 As shown: A flame-cutting resistant composite coated bulletproof steel plate, comprising a flame-retardant layer 1, a thermal barrier layer 2, a bulletproof steel plate layer 3 and a heat-insulating layer 4 which are overlapped in sequence.

[0027] In order to enhance the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3, the adopted bulletproof steel plate layer 3 includes a main body layer 31 and an attachment reinforcement member arranged on two surfaces of the main body layer 31, and the attachment reinforcement member includes a plurality of attachment grooves uniformly distributed on the main body layer 31 and an attachment protrusion 32 arranged between two adjacent attachment grooves; the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3 is improved by increasing the contact area between them, and at the same time, the longitudinal tensile force of the contact surface between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3 can be increased; wherein, the attachment protrusion 32 includes a connecting column integrally formed with the main body layer 31 and a limiting block integrally formed with the connecting column, the limiting block and the main body layer 31 are located at different ends of the connecting column, and the diameter of the connecting column is smaller than the block diameter of the limiting block; through the structural design of the limiting block, it can produce a certain compression effect on the thermal barrier layer 2 or the thermal insulation layer 4, further improving the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3.

[0028] The specific parameters and preparation method of the flame cutting resistant composite coated bulletproof steel plate are as follows:

[0029] 1. A bulletproof steel plate layer 3 having a body layer 31 with a thickness of 6.5 mm is selected, and the surface of the bulletproof steel plate layer 3 is first roughened by sandblasting to improve the adhesion of the surface of the bulletproof steel plate layer 3, and then a heat insulating agent whose main component is CrC-25NiCr ceramic is evenly sprayed on the surface of the bulletproof steel plate layer 3 by plasma spraying technology to form a thermal barrier layer 2, and the thickness of the thermal barrier layer 2 is 0.8 mm;

[0030] 2. 85% by weight of expanded graphite and inorganic adhesive are uniformly mixed to form a flame retardant, and then the flame retardant is uniformly sprayed on the surface of the cured thermal barrier layer 2 by compressed air high-pressure spraying to form a flame retardant layer 1. The thickness of the flame retardant layer 1 after curing is 2 mm;

[0031] 3. 85% by weight of lightweight heat-resistant ceramic powder is uniformly mixed with an inorganic adhesive to form a thermal insulation agent, and then the thermal insulation agent is evenly sprayed on a surface of the elastic steel plate layer 3 away from the thermal barrier layer 2 by compressed air high-pressure spraying to form a thermal insulation layer 4. The thickness of the thermal insulation layer 4 after curing is 2 mm.

[0032] Example 4

[0033] refer to Figure 1 As shown: A flame-cutting resistant composite coated bulletproof steel plate, comprising a flame-retardant layer 1, a thermal barrier layer 2, a bulletproof steel plate layer 3 and a heat-insulating layer 4 which are overlapped in sequence.

[0034] In order to enhance the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3, the adopted bulletproof steel plate layer 3 includes a main body layer 31 and an attachment reinforcement member arranged on two surfaces of the main body layer 31, and the attachment reinforcement member includes a plurality of attachment grooves uniformly distributed on the main body layer 31 and an attachment protrusion 32 arranged between two adjacent attachment grooves; the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3 is improved by increasing the contact area between them, and at the same time, the longitudinal tensile force of the contact surface between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3 can be increased; wherein, the attachment protrusion 32 includes a connecting column integrally formed with the main body layer 31 and a limiting block integrally formed with the connecting column, the limiting block and the main body layer 31 are located at different ends of the connecting column, and the diameter of the connecting column is smaller than the block diameter of the limiting block; through the structural design of the limiting block, it can produce a certain compression effect on the thermal barrier layer 2 or the thermal insulation layer 4, further improving the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3.

[0035] The specific parameters and preparation method of the flame cutting resistant composite coated bulletproof steel plate are as follows:

[0036] 1. A bulletproof steel plate layer 3 with a body layer 31 having a thickness of 3 mm is selected, and the surface of the bulletproof steel plate layer 3 is first roughened by sandblasting to improve the adhesion of the surface of the bulletproof steel plate layer 3, and then a heat insulating agent whose main component is CrC-25NiCr ceramic is evenly sprayed on the surface of the bulletproof steel plate layer 3 by plasma spraying technology to form a thermal barrier layer 2, and the thickness of the thermal barrier layer 2 is 0.5 mm;

[0037] 2. Evenly mix 78% by weight of expanded graphite and inorganic adhesive to form a flame retardant, and then evenly spray the flame retardant on the surface of the cured thermal barrier layer 2 by compressed air high-pressure spraying to form a flame retardant layer 1. The thickness of the flame retardant layer 1 after curing is 0.8 mm;

[0038] 3. 80% by weight of lightweight heat-resistant ceramic powder is uniformly mixed with an inorganic adhesive to form a thermal insulation agent, and then the thermal insulation agent is evenly sprayed on a surface of the elastic steel plate layer 3 away from the thermal barrier layer 2 by compressed air high-pressure spraying to form a thermal insulation layer 4. The thickness of the thermal insulation layer 4 after curing is 1.2 mm.

[0039] Example 5

[0040] refer to Figure 1 As shown: A flame-cutting resistant composite coated bulletproof steel plate, comprising a flame-retardant layer 1, a thermal barrier layer 2, a bulletproof steel plate layer 3 and a heat-insulating layer 4 which are overlapped in sequence.

[0041] In order to enhance the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3, the adopted bulletproof steel plate layer 3 includes a main body layer 31 and an attachment reinforcement member arranged on two surfaces of the main body layer 31, and the attachment reinforcement member includes a plurality of attachment grooves uniformly distributed on the main body layer 31 and an attachment protrusion 32 arranged between two adjacent attachment grooves; the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3 is improved by increasing the contact area between them, and at the same time, the longitudinal tensile force of the contact surface between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3 can be increased; wherein, the attachment protrusion 32 includes a connecting column integrally formed with the main body layer 31 and a limiting block integrally formed with the connecting column, the limiting block and the main body layer 31 are located at different ends of the connecting column, and the diameter of the connecting column is smaller than the block diameter of the limiting block; through the structural design of the limiting block, it can produce a certain compression effect on the thermal barrier layer 2 or the thermal insulation layer 4, further improving the adhesion between the thermal barrier layer 2 and the thermal insulation layer 4 and the bulletproof steel plate layer 3.

[0042] The specific parameters and preparation method of the flame cutting resistant composite coated bulletproof steel plate are as follows:

[0043] 1. A bulletproof steel plate layer 3 with a body layer 31 having a thickness of 5 mm is selected, and the surface of the bulletproof steel plate layer 3 is first roughened by sandblasting to improve the adhesion of the surface of the bulletproof steel plate layer 3, and then a heat insulating agent whose main component is CrC-25NiCr ceramic is evenly sprayed on the surface of the bulletproof steel plate layer 3 by plasma spraying technology to form a thermal barrier layer 2, and the thickness of the thermal barrier layer 2 is 0.6 mm;

[0044] 2. 82% by weight of expanded graphite and inorganic adhesive are uniformly mixed to form a flame retardant, and then the flame retardant is uniformly sprayed on the surface of the cured thermal barrier layer 2 by compressed air high-pressure spraying to form a flame retardant layer 1. The thickness of the flame retardant layer 1 after curing is 1.3 mm;

[0045] 3. Evenly mix 77% by weight of lightweight heat-resistant ceramic powder and inorganic adhesive to form a thermal insulation agent, and then use compressed air high-pressure spraying to evenly spray the thermal insulation agent on a surface of the elastic steel plate layer 3 away from the thermal barrier layer 2 to form a thermal insulation layer 4. The thickness of the thermal insulation layer 4 after curing is 0.9 mm.

[0046] The mechanical properties of the bulletproof steel plate layer 3 in Examples 1 to 5 were tested to obtain the data in the following table:

[0047] Table 1

[0048] Serial number Tensile strength(MPa) Example 1 1500 Example 2 1420 Example 3 1630 Example 4 1480 Example 5 1506

[0049] It can be concluded from the test data in Table 1 that the tensile strength of the bulletproof steel plate layer 3 of the flame-cutting resistant composite coated bulletproof steel plate is greater than 1400 MPa, which, combined with the thickness design, enables the flame-cutting resistant composite coated bulletproof steel plate to have a sufficient protection level to prevent bullet penetration.

[0050] The five flame-cutting-resistant composite coated bulletproof steel plates prepared in Examples 1 to 5 were subjected to a target shooting test, and the data in the following table were obtained:

[0051] Table 2

[0052]

[0053] It can be concluded from the test data in Table 2 that the flame-cutting resistant composite coated bulletproof steel plate has sufficient structural strength to resist the impact force of bullets under certain conditions, and can be applied to comprehensive protection of safes, automatic teller machines, and financial escort vehicles.

[0054] The flame cutting resistant composite coated bulletproof steel plates of Examples 1 to 5 were subjected to flame cutting tests, and the data in the following table were obtained:

[0055] Table 3

[0056]

[0057] It can be concluded from the test data in Table 3 that the flame-cutting resistant composite coated bulletproof steel plate has the property of high-temperature cutting resistance, mainly because the expanded graphite in the flame-retardant layer 1 will expand rapidly during high-temperature cutting, and its volume after expansion can reach more than 200 times of the initial volume, thereby having a good thermal insulation effect; at the same time, the effective component CrC-25NiCr ceramic in the thermal barrier layer 2 can greatly reduce the thermal conductivity efficiency of the thermal barrier layer 2, so that the cutting heat source is separated from the bulletproof steel plate layer 3.

[0058] The lightweight heat-resistant ceramic powder in Examples 1 to 5 is MgO ceramic powder, in order to reduce the influence of high temperature and flame on the composite coated bulletproof steel plate resistant to flame cutting.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A flame cutting resistant composite coated bulletproof steel plate, characterized in that: It includes a flame retardant layer, a thermal barrier layer, a bulletproof steel plate layer and a heat insulation layer which are overlapped in sequence; The thermal barrier layer is formed by spraying CrC-25NiCr ceramic on the surface of the bulletproof steel plate layer after sandblasting and roughening by plasma spraying technology; The flame retardant layer is formed by spraying a mixture of expanded graphite and an inorganic adhesive on the thermal barrier layer by high-pressure spraying and then curing; The heat insulation layer is formed by spraying a mixture of light heat-resistant ceramic powder and inorganic adhesive on the bulletproof steel plate layer by high-pressure spraying and then curing; The bulletproof steel plate layer comprises a body layer and attachment reinforcement members arranged on two surfaces of the body layer; The attachment reinforcement member includes a plurality of attachment grooves evenly distributed on the body layer and an attachment protrusion arranged between two adjacent attachment grooves.

2. The flame cutting resistant composite coated bulletproof steel plate according to claim 1, characterized in that: The attachment protrusion includes a connecting column integrally formed with the main body layer and a limiting block integrally formed with the connecting column, the limiting block and the main body layer are located at different ends of the connecting column, and the diameter of the connecting column is smaller than the block diameter of the limiting block.

3. The flame cutting resistant composite coated bulletproof steel plate according to claim 1, characterized in that: The weight percentage of the expanded graphite in the mixture of the expanded graphite and the inorganic adhesive is 75%-85%.

4. The flame cutting resistant composite coated bulletproof steel plate according to claim 1, characterized in that: The weight percentage of the light heat-resistant ceramic powder in the mixture of the light heat-resistant ceramic powder and the inorganic adhesive is 75%-85%.

5. The flame cutting resistant composite coated bulletproof steel plate according to claim 1 or 2, characterized in that: The tensile strength of the bulletproof steel plate layer is greater than 1400 MPa.

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