A vertically conductive basalt fiber composite material and its preparation method

Abstract

The invention discloses a longitudinally conductive basalt fiber composite material and a preparation method thereof, belonging to the technical field of fiber-reinforced composite materials. The method comprises the following steps: subjecting a desized basalt fiber plain weave fabric to a high-temperature and high-pressure water environment for treatment to obtain a hydroxylated basalt fiber plain weave fabric; dispersing metal nanoparticles in a tannic acid solution to obtain tannic acid-modified metal nanoparticles; depositing the tannic acid-modified metal nanoparticles on the surface of the hydroxylated basalt fiber plain weave fabric to obtain a metal nanoparticle-modified basalt fiber plain weave fabric; dispersing a conductive filler, blending it with polycarbonate, and hot pressing to prepare a composite sheet; laminating the metal nanoparticle-modified basalt fiber plain weave fabric and the composite sheet, hot pressing, and annealing to prepare a basalt fiber composite material. The invention improves the longitudinal conductivity of the basalt fiber composite material by modifying the basalt fiber plain weave fabric to increase its interface bonding with a substrate and introducing a conductive composite sheet.

Description

Technical Field

[0001] The invention relates to a longitudinally conductive basalt fiber composite material and a preparation method thereof, belonging to the technical field of fiber-reinforced composite materials. Background Art

[0002] Fiber-reinforced composites, due to their high strength-to-weight ratio, low density, excellent mechanical properties, and corrosion resistance, are widely used as structurally integrated functional materials and hold broad development prospects in aerospace, shipbuilding, automotive, civil engineering, and other fields. As the value of fiber-reinforced composites in various industries is explored, their functionality during service life is gaining increasing attention. In recent years, basalt fiber has seen significant development both internationally and domestically. Its higher strength compared to glass fiber, lower price compared to carbon fiber, and its pollution-free nature have earned it significant attention from domestic and international businesses and scholars.

[0003] Because basalt fibers and the matrix are inherently insulating, the resulting basalt fiber composites lack functionality, limiting their application. Before imparting functionality to basalt fiber composites, their electrical properties must be enhanced. Currently, three approaches are available to improve the electrical properties of basalt fiber composites. The first is to embed an additional conductive film within the basalt fiber composite. This introduces numerous stress concentration points at the embedding location, reducing the overall mechanical properties of the basalt fiber composite. Furthermore, the strength heterogeneity between the embedded material and the host material leads to asynchronous damage, making delamination highly likely. The second approach is to impart electrical conductivity to the basalt fiber composite by incorporating conductive nanofillers into the composite matrix. However, the inclusion of conductive nanofillers inevitably increases the viscosity of the matrix, making composite preparation more difficult and costly. Furthermore, agglomeration of the conductive nanofillers is a significant drawback that this approach struggles to overcome. The third method is to deposit conductive nanofillers on the surface of basalt fibers through physical or chemical means. Although this method can improve the electrical properties of basalt fiber composites, it is currently less studied. This is due to the weak bond between the fibers and the conductive nanofillers or the low amount of conductive nanofillers deposited on the fiber surface, which does not effectively improve the mechanical and electrical properties. In addition, these three methods mostly improve the transverse conductivity of basalt fiber composites. The lack of longitudinal conductive paths limits the improvement of longitudinal conductivity of basalt fiber composites.

[0004] To address these challenges, we have developed a longitudinally conductive basalt fiber composite and its preparation method, combining the advantages of surface conductivity of basalt fibers and the dispersion of conductive nanofillers within the matrix. Compared to other methods for imparting conductivity to basalt fiber composites, this method offers advantages such as ease of operation, high economic efficiency, and significant gains. Summary of the Invention

[0005] The present invention mainly overcomes the shortcomings of the existing technology and proposes a longitudinally conductive basalt fiber composite material and a preparation method thereof. The basalt fiber composite material prepared by this method has improved transverse conductivity while also achieving longitudinal conductivity.

[0006] The present invention provides a technical solution to solve the above technical problems: a method for preparing a longitudinally conductive basalt fiber composite material, comprising the following steps:

[0007] S1, placing the desized basalt fiber plain fabric in a high temperature and high pressure water environment to obtain a hydroxylated basalt fiber plain fabric;

[0008] S2, dissolving tannic acid in a tris(hydroxymethyl)aminomethane solution to prepare a tannic acid solution, and dispersing metal nanoparticles in the tannic acid solution to obtain tannic acid-modified metal nanoparticles;

[0009] S3, depositing the tannic acid-modified metal nanoparticles obtained in S2 onto the surface of the hydroxylated basalt fiber plain weave fabric obtained in S1 to obtain the metal nanoparticle-modified basalt fiber plain weave fabric;

[0010] S4, dispersing the conductive filler, blending it with the polycarbonate, and hot pressing to prepare a composite sheet;

[0011] S5. Lay the metal nanoparticle-modified basalt fiber plain fabric obtained in S3 and the composite sheet obtained in S4, hot-press, and anneal to prepare a basalt fiber composite material.

[0012] A further technical solution is that the high temperature in S1 is 150-220°C, the high pressure is 2MPa, and the processing time is 5h.

[0013] A further technical solution is that the content of tannic acid in S2 is 1-5 mg / mL.

[0014] A further technical solution is that the pH of the tris(hydroxymethyl)aminomethane solution in S2 is 8.3-8.7, and the content of tris(hydroxymethyl)aminomethane is 10-40 mM.

[0015] A further technical solution is that the metal nanoparticles in S2 are one of metal nanospheres, metal nanowires and metal nanosheets.

[0016] Furthermore, the particle size of the metal nanoparticles is in the range of 100-500 nm.

[0017] Furthermore, the concentration of the metal nanoparticles is 0.05-0.20 mg / mL and the modification time is 2 h.

[0018] Furthermore, the particle size of the tannic acid modified metal nanoparticles ranges from 200 to 800 nm.

[0019] Furthermore, the mass fraction of tannic acid in the tannic acid-modified metal nanoparticles is 0.09-0.12 wt %.

[0020] A further technical solution is that the deposition method in S3 is suction filtration deposition.

[0021] Furthermore, the filtration is performed twice, and the filtration deposition is performed on the front and back sides of the hydroxylated basalt fiber plain fabric in sequence.

[0022] A further technical solution is that the mass fraction of the tannic acid modified metal nanoparticles in the metal nanoparticle-modified basalt fiber plain fabric in S3 is 0.50-0.80 wt %.

[0023] A further technical solution is that the conductive filler in S4 is a mixture of carbon fiber powder, carbon nanotubes and transition metal carbonitrides.

[0024] Furthermore, the mass ratio of carbon fiber powder, carbon nanotubes and transition metal carbonitride is 6:3:1.

[0025] A further technical solution is that the dispersion method in S4 is ball milling dispersion.

[0026] Furthermore, the dispersion time is 10 hours.

[0027] A further technical solution is that the mass ratio of the conductive filler to the polycarbonate in the S4 is 3:97.

[0028] A further technical solution is that the blending method in S4 is ball milling blending.

[0029] Furthermore, the blending time is 6 hours.

[0030] A further technical solution is that the thickness of the composite sheet in S4 is 400-600 μm.

[0031] A further technical solution is that the ball milling environment is a water-cooled interlayer and nitrogen environment, the rotation speed is 400 rpm, the ball-to-material ratio is 10:1, the ball milling medium is zirconia balls, and the diameter of the zirconia balls is 3-5 mm.

[0032] A further technical solution is that the plying method in S5 is alternating plying, the number of layers of the composite sheet is 10, the number of layers of the basalt fiber plain weave fabric modified with metal nanoparticles is 9, and the upper and lower surfaces are composite sheets.

[0033] Furthermore, the basalt fiber plain weave fabric modified with adjacent metal nanoparticles is layered in a symmetrical manner with a gradient angle.

[0034] Furthermore, the ply laying sequence is -60° / -45° / -30° / -15° / 0° / 15° / 30° / 45° / 60°.

[0035] A further technical solution is that the annealing temperature in S5 is 120° C. and the time is 1 hour.

[0036] The second technical problem to be solved by the present invention is to provide a longitudinally conductive basalt fiber composite material prepared by the above method.

[0037] A further technical solution is that the mass fraction of basalt fiber in the basalt fiber composite material is 58-63wt%.

[0038] A further technical solution is that the density of the basalt fiber composite material is 1.80-1.85 g / cm 3 , the porosity is 3.6-4.4%.

[0039] A further technical solution is that the basalt fiber composite material has a bending strength of 810-960 MPa.

[0040] A further technical solution is that the basalt fiber composite material has a hierarchical conductive network structure.

[0041] Furthermore, the transverse conductivity of the basalt fiber composite material is 2.0-7.0×10 -2 S / m, and the longitudinal conductivity is 3.7-6.2×10 -3 S / m.

[0042] The present invention has the following beneficial effects:

[0043] (1) The present invention hydroxylates the basalt fiber plain fabric through hydrothermal treatment and uses tannic acid to modify metal nanoparticles, so that the basalt fiber and the metal nanoparticles are combined in the form of hydrogen bonds, effectively preventing the metal nanoparticles deposited during the processing from falling off the surface of the basalt fiber; the deposited metal nanoparticles increase the surface roughness of the basalt fiber, and at the same time, the active groups of tannic acid are combined with the polycarbonate matrix through various methods including chemical bonds and hydrogen bonds, thereby improving the interface bonding between the basalt fiber and the matrix, thereby achieving the purpose of enhancing the mechanical properties of the basalt fiber composite material.

[0044] (2) The present invention deposits tannic acid-modified metal nanoparticles on the surface of basalt fiber plain fabric by filtration. This method is simple, easy to operate, and has high economic benefits. In addition, the tannic acid-modified metal nanoparticles can construct a transition layer at the interface between the basalt fiber and the polycarbonate matrix, which is beneficial to slow down the modulus mutation from the basalt fiber to the polycarbonate matrix. At the same time, the matrix of the embedded composite sheet serves as the matrix of the basalt fiber composite material, which can effectively reduce the incompatibility of heterogeneous materials and avoid mechanical mismatch of the composite material.

[0045] (3) The present invention uses metal nanoparticles to modify basalt fiber plain fabric, which gives the basalt fiber plain fabric electrical conductivity. The basalt fiber plain fabric is connected to a conductive composite sheet, which makes up for the disadvantage of low longitudinal conductivity of traditional conductive basalt fiber composite materials. In addition, the three-dimensional conductive network structure constructed by carbon fibers, carbon nanotubes and transition metal carbonitrides in the composite sheet and the multi-scale conductive network structure formed by the conductive network on the surface of the basalt fiber are conducive to the effective transfer of electrons, which can further improve the longitudinal conductivity of the basalt fiber composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a preparation flow chart of the present invention;

[0047] Figure 2 Scanning electron microscopy image of basalt fiber plain weave fabric modified with metal nanoparticles;

[0048] Figure 3 is the bending strength diagram of basalt fiber composites;

[0049] Figure 4 The electrical conductivity diagram of basalt fiber composite material. DETAILED DESCRIPTION

[0050] The present invention will be further described below with reference to the embodiments, comparative examples and accompanying drawings.

[0051] Example 1

[0052] like Figure 1 As shown, the preparation method of a longitudinally conductive basalt fiber composite material of the present invention comprises the following steps:

[0053] Step 1: treating the desized basalt fiber plain fabric at 180° C. and 2 MPa for 5 h to obtain a hydroxylated basalt fiber plain fabric;

[0054] Step 2: Dissolve 2 mg / mL of tannic acid in a tris(hydroxymethyl)aminomethane solution at a pH of 8.5 to prepare a tannic acid solution, and disperse 0.10 mg / mL of copper nanospheres in the tannic acid solution. The modification time is 2 hours to obtain tannic acid-modified copper nanospheres with a particle size range of 200-800 nm.

[0055] The content of tris(hydroxymethyl)aminomethane was 10 mM, and the particle size of the copper nanospheres ranged from 100 to 500 nm.

[0056] The mass fraction of tannic acid in the tannic acid-modified copper nanospheres was determined by weighing method at room temperature and pressure, and the mass fraction of tannic acid in the tannic acid-modified copper nanospheres was 0.11 wt %.

[0057] Step 3: Filtering and depositing the tannic acid-modified copper nanospheres onto the surface of the hydroxylated basalt fiber plain weave fabric to obtain the copper nanosphere-modified basalt fiber plain weave fabric;

[0058] The filtration was performed twice, and the filtration deposition was carried out on the front and back sides of the hydroxylated basalt fiber plain fabric in turn;

[0059] The mass fraction of the tannic acid-modified copper nanospheres in the copper nanosphere-modified basalt fiber plain fabric was determined by weighing method at room temperature and pressure, and the mass fraction of the tannic acid-modified copper nanospheres in the copper nanosphere-modified basalt fiber plain fabric was 0.70 wt %.

[0060] Step 4: 0.54 g of carbon fiber powder, 0.27 g of carbon nanotubes, and 0.09 g of a mixture of transition metal carbonitrides were ball-milled and dispersed for 10 h, and then ball-milled and blended with 29.1 g of polycarbonate for 6 h, and hot-pressed to prepare a composite sheet of 400-600 μm;

[0061] The ball milling environment is a water-cooled interlayer and nitrogen environment, the rotation speed is 400 rpm, the ball-to-material ratio is 10:1, and the ball milling medium is zirconia balls with a diameter of 3-5 mm.

[0062] Step 5: 9 layers of copper nanosphere-modified basalt fiber plain fabrics and 10 layers of composite sheets were alternately layered, hot pressed, and annealed at 120°C for 1 hour to prepare a basalt fiber composite material;

[0063] Among them, the upper and lower surfaces of the ply are composite sheets, and the plying method of the basalt fiber plain weave fabric modified with adjacent copper nanospheres is a symmetrical ply with a gradient angle, and the plying order is -60° / -45° / -30° / -15° / 0° / 15° / 30° / 45° / 60°.

[0064] The basalt fiber composite material prepared in Example 1 was weighed at room temperature and pressure to determine the mass fraction of basalt fiber and the density of the basalt fiber composite material. The porosity of the basalt fiber composite material was determined using the mass density method. The mass fraction of basalt fiber was 63 wt %, and the density of the basalt fiber composite material was 1.84 g / cm 3 , the porosity is 3.9%.

[0065] Comparative Example 1

[0066] Step 1: 0.54 g of carbon fiber powder, 0.27 g of carbon nanotubes, and 0.09 g of a transition metal carbonitride mixture were ball-milled and dispersed for 10 h, then ball-milled and blended with 29.1 g of polycarbonate for 6 h, and hot-pressed to prepare a 400-600 μm composite sheet;

[0067] The ball milling environment is a water-cooled interlayer and nitrogen environment, the rotation speed is 400 rpm, the ball-to-material ratio is 10:1, and the ball milling medium is zirconia balls with a diameter of 3-5 mm.

[0068] Step 2: 9 layers of desized basalt fiber plain fabric and 10 layers of composite sheet were alternately layered, hot pressed, and annealed at 120°C for 1 hour to prepare a basalt fiber composite material;

[0069] Among them, the upper and lower surfaces of the ply are composite sheets, and the plying method of adjacent desizing basalt fiber plain fabrics is a symmetrical ply with a gradual angle change, and the plying order is -60° / -45° / -30° / -15° / 0° / 15° / 30° / 45° / 60°.

[0070] Comparative Example 2

[0071] Step 1: treating the desized basalt fiber plain fabric at 180° C. and 2 MPa for 5 h to obtain a hydroxylated basalt fiber plain fabric;

[0072] Step 2: Dissolve 2 mg / mL of tannic acid in a tris(hydroxymethyl)aminomethane solution at a pH of 8.5 to prepare a tannic acid solution, and disperse 0.10 mg / mL of copper nanospheres in the tannic acid solution. The modification time is 2 hours to obtain tannic acid-modified copper nanospheres with a particle size range of 200-800 nm.

[0073] The content of tris(hydroxymethyl)aminomethane was 10 mM, and the particle size of the copper nanospheres ranged from 100 to 500 nm.

[0074] The mass fraction of tannic acid in the tannic acid-modified copper nanospheres was determined by weighing method at room temperature and pressure, and the mass fraction of tannic acid in the tannic acid-modified copper nanospheres was 0.11 wt %.

[0075] Step 3: Filtering and depositing the tannic acid-modified copper nanospheres onto the surface of the hydroxylated basalt fiber plain weave fabric to obtain the copper nanosphere-modified basalt fiber plain weave fabric;

[0076] The filtration was performed twice, and the filtration deposition was carried out on the front and back sides of the hydroxylated basalt fiber plain fabric in turn;

[0077] The mass fraction of the tannic acid-modified copper nanospheres in the copper nanosphere-modified basalt fiber plain fabric was determined by weighing method at room temperature and pressure, and the mass fraction of the tannic acid-modified copper nanospheres in the copper nanosphere-modified basalt fiber plain fabric was 0.70 wt %.

[0078] Step 4: 30 g of polycarbonate was ball-milled and blended for 6 h, and then hot-pressed to prepare a polycarbonate sheet of 400-600 μm;

[0079] The ball milling environment is a water-cooled interlayer and nitrogen environment, the rotation speed is 400 rpm, the ball-to-material ratio is 10:1, and the ball milling medium is zirconia balls with a diameter of 3-5 mm.

[0080] Step 5: 9 layers of copper nanosphere-modified basalt fiber plain fabrics were alternately layered with 10 layers of polycarbonate sheets, hot-pressed, and annealed at 120°C for 1 hour to prepare a basalt fiber composite material;

[0081] Among them, the upper and lower surfaces of the ply are composite sheets, and the plying method of the basalt fiber plain weave fabric modified with adjacent copper nanospheres is a symmetrical ply with a gradient angle, and the plying order is -60° / -45° / -30° / -15° / 0° / 15° / 30° / 45° / 60°.

[0082] The copper nanosphere-modified basalt fiber plain weave fabric prepared in steps 1, 2, and 3 of Example 1 was subjected to microscopic morphology observation, and the results are as follows: Figure 2 shown.

[0083] Figure 2 The results revealed that the surface of the copper nanosphere-modified basalt fiber plain fabric exhibited a uniform spherical morphology, indicating that the tannic acid-modified copper nanospheres were successfully deposited on the surface of the basalt fiber plain fabric. This facilitated the formation of a strong mechanical meshing effect between the basalt fiber and the polycarbonate matrix, thereby strengthening the interfacial bonding between the fiber and the polycarbonate matrix.

[0084] The Example 1, the Comparative Example 1 and the Comparative Example 2 were subjected to a unidirectional bending test, and the results are as follows: Figure 3 shown.

[0085] Figure 3It is revealed that the flexural strength of the basalt fiber composite material prepared in Example 1 is 919 MPa, which is greater than the flexural strength of the basalt fiber composite materials prepared in Comparative Examples 1 and 2. This is because the surface of the basalt fiber plain fabric modified with copper nanospheres becomes rough, which increases the mechanical meshing points between the fiber and the matrix; and the surface of the modified basalt fiber is rich in a variety of active groups, which can be combined with the polycarbonate matrix through chemical bonds, hydrogen bonds, etc., thereby improving the interface bonding between the fiber and the matrix; the copper nanospheres modified with tannic acid can construct a transition layer at the interface between the basalt fiber and the polycarbonate matrix, which is beneficial to slow down the modulus mutation from the basalt fiber to the polycarbonate matrix; at the same time, the matrix of the embedded composite sheet serves as the matrix of the basalt fiber composite material, which can effectively reduce the incompatibility of heterogeneous materials and avoid mechanical mismatch of the composite material. These factors work together to effectively transfer stress from the polycarbonate matrix to the basalt fiber, thereby improving the mechanical properties of the basalt fiber composite material.

[0086] The conductivity test of Example 1, Comparative Example 1 and Comparative Example 2 was performed, and the results are as follows: Figure 4 shown.

[0087] Figure 4 It is revealed that the transverse and longitudinal electrical conductivities of the basalt fiber composite material prepared in Example 1 are 5.0×10 - 2 S / m and 4.6×10 -3 The results show that the copper nanospheres impart electrical conductivity to the basalt fiber plain weave fabric, connecting the conductive composite sheets and forming a three-dimensional conductive network structure running across the horizontal and vertical directions of the basalt fiber composites, thereby improving the electrical performance of the basalt fiber composites.

[0088] The above description does not limit the present invention in any form. Although the present invention has been disclosed through the above embodiments, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a longitudinally conductive basalt fiber composite material, characterized in that: The following steps are involved: S1, placing the desized basalt fiber plain fabric in a high temperature and high pressure water environment to obtain a hydroxylated basalt fiber plain fabric; S2, dissolving tannic acid in a tris(hydroxymethyl)aminomethane solution to prepare a tannic acid solution, and dispersing metal nanoparticles in the tannic acid solution to obtain tannic acid-modified metal nanoparticles; S3, depositing the tannic acid-modified metal nanoparticles obtained in S2 onto the surface of the hydroxylated basalt fiber plain weave fabric obtained in S1 to obtain the metal nanoparticle-modified basalt fiber plain weave fabric; S4, dispersing the conductive filler, blending it with the polycarbonate, and hot pressing to prepare a composite sheet; S5. Lay the metal nanoparticle-modified basalt fiber plain fabric obtained in S3 and the composite sheet obtained in S4, hot-press, and anneal to prepare a basalt fiber composite material.

2. The method for preparing a longitudinally conductive basalt fiber composite material according to claim 1, characterized in that: The high temperature in S1 is 150-220° C., the high pressure is 2 MPa, and the treatment time is 5 hours.

3. The method for preparing a longitudinally conductive basalt fiber composite material according to claim 1, characterized in that: The content of tannic acid in the S2 is 1-5 mg / mL; the pH of the tris(hydroxymethyl)aminomethane solution is 8.3-8.7, and the content of tris(hydroxymethyl)aminomethane is 10-40 mM; the metal nanoparticles are one of metal nanospheres, metal nanowires and metal nanosheets; the particle size range of the metal nanoparticles is 100-500 nm; the concentration of the metal nanoparticles is 0.05-0.20 mg / mL, and the modification time is 2 h; the particle size range of the tannic acid-modified metal nanoparticles is 200-800 nm; the mass fraction of tannic acid in the tannic acid-modified metal nanoparticles is 0.09-0.12 wt%.

4. The method for preparing a longitudinally conductive basalt fiber composite material according to claim 1, characterized in that: The deposition method in S3 is suction filtration deposition, and the suction filtration is performed twice on the front and back sides of the hydroxylated basalt fiber plain fabric in sequence; the mass fraction of the tannic acid modified metal nanoparticles in the metal nanoparticle-modified basalt fiber plain fabric is 0.50-0.80wt%.

5. The method for preparing a longitudinally conductive basalt fiber composite material according to claim 1, characterized in that: The conductive filler in S4 is a mixture of carbon fiber powder, carbon nanotubes and transition metal carbonitrides, wherein the mass ratio of carbon fiber powder, carbon nanotubes and transition metal carbonitrides is 6:3:1; the dispersion method is ball milling dispersion, and the dispersion time is 10 hours; the mass ratio of the conductive filler to polycarbonate is 3:97; the blending method is ball milling blending, and the blending time is 6 hours; the thickness of the composite sheet is 400-600 μm.

6. The method for preparing a longitudinally conductive basalt fiber composite material according to claim 5, characterized in that: The ball milling environment is a water-cooled interlayer and nitrogen environment, the rotation speed is 400 rpm, the ball-to-material ratio is 10:1, the ball milling medium is zirconia balls, and the diameter of the zirconia balls is 3-5 mm.

7. The method for preparing a longitudinally conductive basalt fiber composite material according to claim 1, characterized in that: The plying method in S5 is alternating plying, the number of layers of the composite sheet is 10, the number of layers of the basalt fiber plain weave fabric modified with metal nanoparticles is 9, and the upper and lower surfaces are composite sheets; the plying method of adjacent metal nanoparticle-modified basalt fiber plain weave fabrics is symmetrical plying with a gradient angle, and the plying order is -60° / -45° / -30° / -15° / 0° / 15° / 30° / 45° / 60°; the annealing temperature is 120°C and the time is 1 hour.

8. A longitudinally conductive basalt fiber composite material, characterized by: The basalt fiber composite material capable of longitudinal conductivity is prepared according to the preparation method of any one of claims 1 to 7.

9. The longitudinally conductive basalt fiber composite material according to claim 8, characterized in that: The mass fraction of basalt fiber in the basalt fiber composite material is 58-63wt%; the density of the basalt fiber composite material is 1.80-1.85g / cm 3 , porosity is 3.6-4.4%; the flexural strength of the basalt fiber composite material is 810-960 MPa; the basalt fiber composite material has a hierarchical conductive network structure; the transverse conductivity of the basalt fiber composite material is 2.0-7.0×10 -2 S / m, and the longitudinal conductivity is 3.7-6.2×10 -3 S / m.

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