Metal adhesive reinforced composite explosive and method

Abstract

The invention discloses a metal adhesive reinforced composite explosive and a method. According to the invention, the surfaces of metal fuel particles and / or explosive particles of the composite explosive are coated with low-melting-point metal and alloy; by utilizing the melting creep effect of low-melting-point metal and alloy in the high-temperature compression molding process, multi-component particle gaps are effectively filled to inhibit internal microdefects, a three-dimensional network structure is formed among multi-component interfaces of the composite explosive, and the interface action, the mechanical property and the density are enhanced; meanwhile, the low-melting-point metal has oxidation reaction and embrittlement catalytic action, energy can be released, and the reaction energy release characteristic of metal combustion is further enhanced. Based on high creep property and high density of low-melting-point metal and alloy, the density, mechanical property and energy property of the composite explosive can be improved, and the composite explosive has important application prospects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energetic materials, in particular to a metal-bonding enhanced composite explosive and method. BACKGROUND

[0002] Composite explosives are the core materials of advanced weapon ammunition damage due to their high energy output and excellent safety, and are the key and basis of the development of energetic materials field and weapon equipment. The composite explosive is mainly composed of CHON explosive particles, metal fuel particles, high polymer binder and other functional additives. CHON explosives such as HMX, RDX explosives, metal fuels such as boron (B), aluminum (Al), etc., high polymer binders such as fluororesin, polyurethane, etc., and functional additives mainly include sensitizer reducing agents, bonding agents, etc. In order to achieve high energy density and meet the application requirements of weapon equipment, the content of energetic solid particles (explosives and metal fuels) is generally increased, such as up to 95%, which is a typical high solid particle filling system. This leads to the mechanical properties of the composite explosive being weak, especially the tensile strength and strain being not high, which becomes a bottleneck problem for its development and engineering application.

[0003] The main reasons for the weak mechanical properties of composite explosives are: first, the high content of solid-phase particles and the low content of binder, usually less than 5% of high-molecular-weight binder; second, the complex interface between explosives, metal fuel, and functional additives in the typical multi-component system, which is prone to interface defects and debonding. Current methods to improve the mechanical properties of composite explosives include: first, developing high-molecular-weight binders with higher strength and toughness; second, enhancing the interface effect through bonding agents; and third, adding nano-particles for reinforcement and toughening. Previous researchers have studied the influence of fluororesin, such as F2311 and F2314, on the mechanical properties of explosives (TATB and HMX) and the interface bonding mechanism through theoretical simulation and experimental methods, providing a theoretical and experimental basis for improving the mechanical properties of composite explosives. He Guansong et al. (201910198066.9) from the Institute of Chemical Materials of the China Academy of Engineering Physics and An Chongwei et al. (202310095278.0) from North University have invented a method of using polyurethane and grafting to improve the tensile strength and toughness of composite explosives. To further improve the mechanical properties, researchers have introduced surface bonding technology based on the reinforcement of binders. Kincaid et al. have used different coupling agents to modify the surface of HMX (1,3,5,7-tetranitro-1,3,5,7-tetrazocane) particles to improve the interface strength between explosive particles and high-molecular-weight binders, thereby improving the mechanical properties of composite explosives. In USP.4043850, polyaminocarboxylic acid is used to coat HMX once, and then an ethanol-based solution and dibutyltin bisacetate are used to coat HMX particles twice to improve the mechanical properties. Guo Xueyong et al. (202410653108.4) from Beijing University of Technology have coated CL-20 explosive particles with a bonding agent, and then coated them with a high-molecular-weight binder to improve the mechanical properties and safety of CL-20-based composite explosives. Liu Rujiang et al. (201910734485.X) have introduced a new two-component binder and a polyurea reaction to coat explosive particles and other materials in multiple layers, thereby significantly improving the mechanical properties of composite explosives. He Guansong et al. (202310927071.5) have invented a method to synergistically improve the mechanical and thermal properties of mixed explosives by coating explosive crystals with polyphenolic compounds to activate the surface of the explosive crystals, improve the interface effect, and enhance the mechanical properties of the explosives. Zeng Chengcheng (202410595034.3) et al. have disclosed a composite explosive modified by supramolecular UPy and a preparation method, which uses the dual action of multiple hydrogen bond supramolecules and polymer binders to improve the tensile strength and fracture toughness of TATB-based explosives, with the Brazilian mechanical strength of the composite explosive reaching 7.94 MPa. Wang Jun et al. (ZL201510068482.9) have used nano-particle reinforcement to introduce nano-explosive particles to enhance the interface effect of composite explosives, thereby improving the mechanical properties of composite explosives.But overall, the main shortcomings and problems of the existing mechanical property improvement method, one is the particularity of explosive itself and the application environment requirements, there are few high polymer binder to meet the requirements; two is to use the bonding agent can improve the interface effect, but the effect of improving the mechanical properties is limited, the improvement result mainly depends on the interface interaction between the bonding agent molecules, explosive particles and high polymer; Nanoparticle reinforcement has better effect on strength, but the toughness is poor, and the content of nanoparticles can only be added in small amount, and the increase of the content will bring problems such as pressing density and storage stability. The most important thing is that the energy and density of high polymer material itself are low, and improving the mechanical properties is not conducive to the density and detonation energy output performance of composite explosive. SUMMARY

[0004] Therefore, the application provides a metal adhesive reinforced composite explosive, which uses low melting point metal to form a three-network network, effectively improves the mechanical strength and toughness, and enhances the density and energy of the composite explosive.

[0005] The metal adhesive reinforced composite explosive provided by the application comprises explosive particles, metal fuel particles, a high polymer binder, and low melting point metal particles or alloys.

[0006] Preferably, the low melting point metal or alloy is bismuth, indium, tin, gallium, lithium or an alloy thereof.

[0007] Preferably, the low melting point alloy is Field's Meta, a bismuth-based alloy or an indium-tin alloy.

[0008] Preferably, the particle size of the low melting point metal or alloy is 0.2 μm to 5 μm.

[0009] Preferably, the mass of the low melting point metal or alloy is not more than 5% of the total mass of the reinforced composite explosive.

[0010] Preferably, the explosive particles are one or more of HMX, RDX, TATB, LLM-105 and FOX-7, and the particle size is 15 μm to 20 μm.

[0011] Preferably, the metal fuel particles are one or more of aluminum, boron, silicon, titanium, aluminum boron alloy and aluminum magnesium alloy, and the particle size is 5 μm to 50 μm.

[0012] The application further provides a preparation method of the reinforced composite explosive, which comprises the following steps: S1, in a solvent, the low melting point metal or alloy particles are adhered to the surfaces of the metal fuel particles and / or explosive particles by the high polymer binder to form composite metal particles and / or composite explosive particles with core-shell structure. S2, secondary assembly of the composite metal particle / explosive particle, or metal particle / composite explosive particle, or composite metal particle / composite explosive particle in a solvent to form high-energy microspheres; S3, drying of the high-energy microsphere particles and then placing them in a mold for high-temperature compression molding.

[0013] Preferably, in S2, the high-energy microsphere particle size is 1-2 mm.

[0014] Preferably, in S3, the temperature for high-temperature compression molding is 60-150°C.

[0015] Beneficial effects: The present application coats low-melting-point metals and alloys on the surfaces of metal fuel particles and / or explosive particles of composite explosives; utilizes the melting creep effect of low-melting-point metals and alloys in the high-temperature compression molding process to form a three-dimensional network structure between the interfaces of the multiple components of the composite explosives under the coupling of force and heat, thereby improving the mechanical properties. Meanwhile, compared with high-molecular-weight binders and bonding agents, the low-melting-point metals or alloys used in the present application have high density, which can improve the density of the composite explosives. In addition, the low-melting-point metals have oxidation reaction and embrittlement catalysis, which can release energy, further enhancing the reaction energy release characteristics of metal combustion. Based on the high creep property and high density of the metal adhesive, the present application effectively fills the gaps between the multiple component particles to inhibit internal microdefects, enhances the interface action and mechanical properties, and at the same time, can improve the density and energy performance of the composite explosives, which has important application prospects. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Figure 1 is a schematic diagram of the three-dimensional network structure of low-melting-point metals in composite explosives according to the present application; Figure 2 Figure 2 is an SEM image of Bi-HMX-Al explosive microspheres containing low-melting-point metals according to the present application; Figure 3 is a photograph of a Bi-HMX-Al explosive grain containing low-melting-point metals according to the present application; Figure 4 Figure 4 is a tensile curve of Bi-HMX-Al explosive containing low-melting-point metals according to the present application; Figure 5 Figure 5 is a tensile curve of Bi-HMX / TATB-Al explosive containing low-melting-point metals according to the present application; Figure 6 Figure 6 is a tensile curve of Bi-LLM-105-Al explosive containing low-melting-point metals according to the present application. DETAILED DESCRIPTION

[0017] The present application will be described in detail below with reference to the accompanying drawings and examples.

[0018] The application provides a metal-bonded reinforced composite explosive.

[0019] The strength and density of the metal material are several times of those of the polymer material, so that the metal material can be used as a binder to improve the mechanical properties and density of the composite explosive; meanwhile, the metal material can be used as a fuel to participate in the explosive explosion reaction and improve the energy output performance. Compared with common high-strength metals, the application uses suitable low-melting-point metals and alloys, such as bismuth, tin and alloys thereof, and uses the creep effect of the low-melting-point metals and alloys at high temperatures to successfully embed the low-melting-point metals and alloys between the explosive and the metal particles to form a three-dimensional network, which plays a role in bonding the metal fuel particles and the explosive particles and improves the mechanical strength and toughness of the composite explosive.

[0020] Specifically, the application selects suitable low-melting-point metals or alloys for the composite explosive, the low-melting-point metals or alloys refer to metals or alloys that can creep during the high-temperature pressing process of the composite explosive, the low-melting-point metals or alloys are coated on the metal fuel particles and / or explosive particles of the composite explosive, and then mixing and high-temperature pressing are performed, the low-melting-point metals creep during the high-temperature pressing process of the composite explosive, and a three-dimensional interlaced network is formed under the force-heat coupling effect, so that the mechanical properties and energy performance of the composite explosive are effectively improved.

[0021] Preferably, the low-melting-point metals or alloys are bismuth (Bi), indium (In), tin (Sn), gallium (Ga), lithium (Li) or the like, or alloys thereof, such as Field's Metal (Bi / In / Sn), bismuth-based alloy (Bi-In-Sn), indium-tin alloy (In / Sn) or the like.

[0022] Preferably, the particle size of the low-melting-point metals or alloys is 0.2 μm to 5 μm.

[0023] Preferably, the mass of the low-melting-point metals or alloys is not more than 5% of the total mass of the reinforced composite explosive.

[0024] The application is suitable for all composite explosives. Preferably, the explosive particles in the composite explosive are one or more of HMX, RDX, TATB, LLM-105, FOX-7 or the like, and the particle size is preferably 15 μm to 20 μm; and the metal fuel particles are one or more of aluminum (Al), boron (B), silicon (Si), titanium (Ti), aluminum-boron alloy, aluminum-magnesium alloy or the like, and the particle size is preferably 5 μm to 50 μm.

[0025] The application also provides a preparation method of the reinforced composite explosive, which comprises the following steps: S1, based on the composite explosive to be reinforced, selecting suitable low-melting-point metals or alloys (such as low-melting-point metals or alloys with a melting point MTmelt <350℃), the content of low-melting metal or alloy is optimized according to the interface characteristics, and the mass of the low-melting metal or alloy is generally not more than 5% of the total mass of the reinforced composite explosive; S2, adhering the low-melting metal or alloy particles to the surfaces of the metal fuel particles and / or explosive particles of the composite explosive by the high-molecular binder in an organic solvent to form composite metal particles and / or composite explosive particles with a core-shell structure; wherein the organic solvent is preferably ethyl acetate, butyl acetate, DMSO, etc. S3, using the remaining high-molecular binder to assemble the composite metal particles, the composite explosive particles, and other functional additives (if any) again in a solvent of the insoluble / microsoluble high-molecular binder such as water to form high-energy microspheres; wherein the particle size of the high-energy microspheres is preferably 1-2 mm; S4, after drying the high-energy microsphere particles, transferring them to a molding die, and performing high-temperature compression molding at a certain temperature, in the process of high-temperature compression molding, the low-melting metal or alloy undergoes creep, and a three-dimensional network structure is formed between the interfaces of the multi-component composite explosive under the action of force and heat, thereby bonding the particles of the composite explosive and improving the mechanical properties and energy performance.

[0026] Preferably, the heating temperature of the die compression molding is 60-150 ℃.

[0027] Example 1: 1.5 g of nano-bismuth particles (Bi, melting point 271 ℃) were dispersed in a solution of a high-molecular binder, 10.0 g of aluminum powder was added and mixed uniformly, and the nano-particles were coated on the surface of the aluminum powder under the action of the high-molecular binder by solvent evaporation; 20.0 g of HMX explosive particles were added to the solution of the high-molecular binder and mixed uniformly, and then the bismuth-coated Al was added to the HMX explosive mixture and stirred uniformly; heated to 50 ℃ and continuously stirred until a large number of millimeter-level microsphere particles were formed, then dried after suction filtration to obtain a reinforced composite explosive; according to the size of the test piece, the reinforced composite explosive was weighed and added to the mold, heated at 65 ℃ for 2 h, and then pressurized for 10 min to obtain a mechanical test piece, the Brazilian strength of which was 4.58 MPa and the strain was 0.89, which were increased by 31.7% and 99.1% respectively compared with the sample without bismuth.

[0028] Example 2: 1.0 g of nano-tin (Sn, melting point 232 °C) particles were dispersed in a solution of a high molecular binder, 10.0 g of boron powder was added and mixed uniformly, and the nano-particles were loaded on the surface of the boron powder under the action of the high molecular binder by solvent evaporation; 20.0 g of RDX explosive particles were added to the high molecular binder solution and mixed uniformly, and the tin-loaded boron was added to the RDX explosive-containing mixture and stirred uniformly; heated to 50 °C and continuously stirred until a large number of millimeter-level microspheres were formed, and the enhanced composite explosive was obtained after drying by suction filtration; according to the size of the test piece, the enhanced composite explosive was weighed and added to the mold, heated at 120 °C for 2 h, and then pressurized for 10 min to obtain a mechanical test piece, with a Brazilian strength of 4.21 MPa and a strain of 0.41, which were increased by 26.2% and 73.3%, respectively, compared with the sample without tin.

[0029] Example 3: 0.15 g of nano-indium (In, melting point 156.51 °C) particles were dispersed in a solution of a high molecular binder, 20.0 g of TATB explosive particles were added and mixed uniformly, and the indium particles were loaded on the surface of the TATB under the action of the high molecular binder by solvent evaporation; 6.0 g of Al particles were added to the high molecular binder solution and mixed uniformly, and the indium-loaded TATB was added to the Al particle-containing mixture and stirred uniformly; heated to 50 °C and continuously stirred until a large number of millimeter-level microspheres were formed, and the enhanced composite explosive was obtained after drying by suction filtration; according to the size of the test piece, the enhanced composite explosive was weighed and added to the mold, heated at 130 °C for 2 h, and then pressurized for 10 min to obtain a mechanical test piece, with a Brazilian strength of 5.81 MPa and a strain of 0.63, which were increased by 17.2% and 32.7%, respectively, compared with the sample without indium (In).

[0030] Example 4: 0.50 g of nano-tin bismuth alloy particles (Sn / Bi, melting point 138 °C) were dispersed in a solution of a high molecular binder, 10.0 g of titanium powder was added and mixed uniformly, and the tin bismuth alloy particles were loaded on the surface of the titanium powder under the action of the high molecular binder by solvent evaporation; 20.0 g of LLM-105 explosive particles were added to the high molecular binder solution and mixed uniformly, and the tin bismuth alloy particle-loaded titanium was added to the LLM-105 explosive-containing mixture and stirred uniformly; heated to 50 °C and continuously stirred until a large number of millimeter-level microspheres were formed, and the enhanced composite explosive was obtained after drying by suction filtration; according to the size of the test piece, the enhanced composite explosive was weighed and added to the mold, heated at 130 °C for 2 h, and then pressurized for 10 min to obtain a mechanical test piece, with a Brazilian strength of 4.3 MPa and a strain of 0.13, which were increased by 213% and 44.3%, respectively, compared with the sample without tin bismuth alloy (Sn / Bi).

[0031] Example 5: 0.12 g nano-bismuth (Bi, melting point 271 °C) particles were dispersed in a solution of a high molecular binder, 10.0 g of aluminum powder was added and mixed uniformly, and bismuth (Bi) particles were loaded on the surface of aluminum powder under the action of the high molecular binder by solvent evaporation; 20.0 g of LLM-105 explosive particles were added to the high molecular binder solution and mixed uniformly, and the bismuth (Bi) loaded aluminum was added to the mixture containing LLM-105 explosive, and stirred uniformly; heated to 50 °C and continuously stirred until a large number of millimeter-sized microspheres were formed, and after filtration and drying, a reinforced composite explosive was obtained; according to the size of the test piece, the reinforced composite explosive was weighed and added to the mold, heated at 80 °C for 2 h, and then pressurized for 10 min to obtain a mechanical test piece, with a Brazilian strength of 4.43 and a strain of 0.69, which were increased by 32.5% and 43.1% respectively compared with the same sample without bismuth (Bi).

[0032] Example 6: 0.15 g nano-bismuth (Bi, melting point 271 °C) particles were dispersed in a solution of a high molecular binder, 10.0 g of aluminum powder was added and mixed uniformly, and bismuth (Bi) particles were loaded on the surface of aluminum powder under the action of the high molecular binder by solvent evaporation; 15.0 g of HMX and 5.0 g of TATB explosive particles were added to the high molecular binder solution and mixed uniformly, and the bismuth (Bi) loaded aluminum was added to the mixture containing HMX and TATB explosive, and stirred uniformly; heated to 50 °C and continuously stirred until a large number of millimeter-sized microspheres were formed, and after filtration and drying, a reinforced composite explosive was obtained; according to the size of the test piece, the reinforced composite explosive was weighed and added to the mold, heated at 70 °C for 2 h, and then pressurized for 10 min to obtain a mechanical test piece, with a Brazilian strength of 5.83 and a strain of 0.52, which were increased by 38.8% and -17.5% respectively compared with the same sample without bismuth (Bi).

[0033] Example 7: 0.15 g nano-bismuth (Bi, melting point 271 °C) particles were dispersed in a solution of a high molecular binder, 10.0 g of aluminum powder was added and mixed uniformly, and bismuth (Bi) particles were loaded on the surface of aluminum powder under the action of the high molecular binder by solvent evaporation; 15.0 g of HMX and 5.0 g of TATB explosive particles were added to the high molecular binder solution and mixed uniformly, and the bismuth (Bi) loaded aluminum was added to the mixture containing HMX and TATB explosive, and stirred uniformly; heated to 50 °C and continuously stirred until a large number of millimeter-sized microspheres were formed, and after filtration and drying, a reinforced composite explosive was obtained; according to the size of the test piece, the reinforced composite explosive was weighed and added to the mold, heated at 70 °C for 2 h, and then pressurized for 10 min to obtain a mechanical test piece, with a Brazilian strength of 5.83 and a strain of 0.52, which were increased by 38.8% and -17.5% respectively compared with the same sample without bismuth (Bi). 0.15 g nano-bismuth (Bi, melting point 271 °C) particles were dispersed in a solution of a high molecular binder, 10.0 g of aluminum powder was added and mixed uniformly, and bismuth (Bi) particles were loaded on the surface of aluminum powder under the action of the high molecular binder by solvent evaporation; 15.0 g of HMX and 5.0 g of TATB explosive particles were added to the high molecular binder solution and mixed uniformly, and the bismuth (Bi) loaded aluminum was added to the mixture containing HMX and TATB explosive, and stirred uniformly; heated to 50 °C and continuously stirred until a large number of millimeter-sized microspheres were formed, and after filtration and drying, a reinforced composite explosive was obtained; according to the size of the test piece, the reinforced composite explosive was weighed and added to the mold, heated at 70 °C for 2 h, and then pressurized for 10 min to obtain a mechanical test piece, with a Brazilian strength of 5.83 and a strain of 0.52, which were increased by 38.8% and -17.5% respectively compared with the same sample without bismuth (Bi).

[0034] Example 8: 0.15 g of nano indium bismuth alloy (In / Bi, melting point 72 °C) particles were dispersed in a solution of a high molecular binder, 20.0 g of HMX explosive particles were added and mixed uniformly, and bismuth particles were loaded on the surface of HMX under the action of a high molecule by solvent evaporation; 5.0 g of Al particles were added to the solution of the high molecular binder and mixed uniformly, and the HMX loaded with indium bismuth alloy was added to the mixture containing Al particles and stirred uniformly; heated to 50 °C and continuously stirred until a large number of millimeter-level microspheres were formed, and the enhanced composite explosive was obtained after drying by suction filtration; according to the size of the test piece, the enhanced composite explosive was weighed and added to the mold, heated at 80 °C for 2 h, and then pressurized for 10 min to obtain a mechanical test piece, the Brazil strength of which was 4.21 MPa, and the strain was 0.41, which was increased by 26.2% and 73.3% respectively compared with the same sample without indium bismuth alloy (In / Bi).

[0035] Example 9: 0.10 g of nano indium bismuth alloy (In / Bi, melting point 72 °C) particles were dispersed in a solution of a high molecular binder, 8.0 g of aluminum magnesium alloy particles were added and mixed uniformly, and bismuth particles were loaded on the surface of aluminum magnesium alloy particles under the action of a high molecule by solvent evaporation; 20.0 g of FOX-7 explosive particles were added to the solution of the high molecular binder and mixed uniformly, and the aluminum magnesium alloy particles loaded with indium bismuth alloy (In / Bi) were added to the mixture containing FOX-7 particles and stirred uniformly; heated to 50 °C and continuously stirred until a large number of millimeter-level microspheres were formed, and the enhanced composite explosive was obtained after drying by suction filtration; according to the size of the test piece, the enhanced composite explosive was weighed and added to the mold, heated at 80 °C for 2 h, and then pressurized for 10 min to obtain a mechanical test piece, the Brazil strength of which was 5.21 MPa, and the strain was 0.23, which was increased by 21.6% and 25.7% respectively compared with the same sample without indium bismuth alloy (In / Bi).

[0036] Example 10: 0.80 g of nano-indium tin alloy particles (In / Sn, melting point 118 ℃) were dispersed in a polymer binder solution, and 10.0 g of silicon powder was added and mixed evenly. The nanoparticles were loaded onto the silicon powder surface under the action of the polymer binder through solvent evaporation. 20.0 g of TATB explosive particles were added to the polymer binder solution and mixed evenly. Then, silicon loaded with indium tin alloy was added to the TATB explosive mixture and stirred evenly. The mixture was heated to 50 ℃ and stirred continuously until a large number of millimeter-sized microspheres were formed. After filtration and drying, the reinforced composite explosive was obtained. The reinforced composite explosive was weighed according to the specimen size and added to the mold. After heating at 120 ℃ for 2 h, pressure was applied for 10 min to obtain the mechanical test specimen. Its Brazilian strength was 6.72 MPa and the strain was 0.83, which were 21.9% and 56.9% higher than the specimen without indium tin alloy, respectively.

[0037] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A metal-adhesive reinforced composite explosive comprising explosive particles, metal fuel particles, and a high molecular binder, characterized in that, Also included are low-melting metal particles or alloys; the low-melting metal or alloy refers to a metal or alloy capable of undergoing creep during high-temperature pressing of the composite explosive; the low-melting metal or alloy is coated on the metal fuel particles and / or explosive particles.

2. The enhanced composite explosive of claim 1, wherein, The low-melting metal or alloy is bismuth, indium, tin, gallium, lithium, or an alloy thereof.

3. The enhanced composite explosive of claim 1, wherein, The low-melting alloy is Field's Meta, a bismuth-based alloy, or an indium-tin alloy.

4. The enhanced composite explosive according to any one of claims 1 to 3, wherein The particle size of the low-melting metal or alloy is 0.2-5 μm.

5. The enhanced composite explosive according to any one of claims 1 to 3, wherein the explosive is a nonel explosive. 5 The mass of the low-melting metal or alloy is not more than 5% of the total mass of the reinforced composite explosive.

6. The enhanced composite explosive of claim 1 wherein, The explosive particles are one or more of HMX, RDX, TATB, LLM-105, and FOX-7; the particle size is 15-20 μm.

7. The enhanced composite explosive of claim 1 wherein, The metal fuel particles are one or more of aluminum, boron, silicon, titanium, aluminum-boron alloy, and aluminum-magnesium alloy; the particle size is 5-50 μm.

8. The method of preparing an enhanced composite explosive according to any one of claims 1 to 7, wherein Comprising: S1, in a solvent, the low-melting metal or alloy particles are adhered to the surface of the metal fuel particles and / or explosive particles by a high-molecular binder to form composite metal particles and / or composite explosive particles with a core-shell structure; S2, in a solvent, the composite metal particles / explosive particles, or metal particles / composite explosive particles, or composite metal particles / composite explosive particles are subjected to secondary assembly to form high-energy microspheres; S3, after drying the high-energy microsphere particles, they are placed in a mold for high-temperature pressing and molding.

9. The method of claim 1, wherein, In S2, the particle size of the high-energy microspheres is 1-2 mm.

10. The method of claim 1, wherein, In S3, the temperature for high-temperature pressing and molding is 60-150 °C.

Images