A method for preparing high-temperature-resistant continuous basalt fiber by raw material multi-component compounding and ceramic coating coating

Abstract

The present application belongs to the field of inorganic non-metallic materials, and particularly relates to a method for preparing high-temperature-resistant continuous basalt fiber by mixing and coating raw materials and ceramic coating. The present application mixes and homogenizes multi-element ores, further introduces high-temperature-resistant oxides, precisely controls the valence state of iron through an oxidizing atmosphere agent, and designs a gradient ceramic coating, so that an mSiO2·nH2O-SiC-Si3N4 gradient protective structure is formed on the surface of the fiber, achieving a synergistic modification effect, thereby systematically improving the high-temperature stability of the fiber.

Description

Technical Field

[0001] This invention belongs to the field of inorganic non-metallic materials, specifically relating to a method for preparing high-temperature resistant continuous basalt fibers by multi-component mixing of raw materials and ceramic coating. Background Technology

[0002] Continuous basalt fiber, as a novel inorganic non-metallic high-performance fiber material, possesses excellent properties such as high strength, high modulus, high temperature resistance, acid and alkali corrosion resistance, and insulation, showing broad application prospects in aerospace, defense, and construction engineering. However, basalt fibers produced by existing methods still have shortcomings in high-temperature resistance, making it difficult to meet the stringent requirements of high-end fields.

[0003] In existing technologies, it is difficult to accurately balance the SiO2-Al2O3-alkaline earth oxide system using a single mineral source, and conventional wetting agent coatings are prone to structural decomposition at around 500-600℃. To address this issue, the applicant has previously filed three related patents, solving the problems of mineral composition defects and fluctuations through multi-source raw material blending, significantly improving the production efficiency of basalt fiber, the strength modulus of the product, and its alkali corrosion resistance. However, the high-temperature resistance of basalt fiber is still limited by: the limitations of the raw material mineral and chemical composition, and Fe²⁺… + The three main factors are insufficient oxidation, inadequate resistance of the surface coating to high-temperature degradation, etc. Summary of the Invention

[0004] To overcome the inherent defects in producing high-temperature resistant continuous basalt fibers from single ore raw materials, this invention specifically increases the mass percentage (wt%) of high-temperature resistant oxides such as Al2O3, TiO2, and MgO, and reduces the mass percentage of alkali metal oxides with poor high-temperature resistance such as K2O and Na2O, through the blending and homogenization of multiple ores; it introduces composite oxides such as Zr-Al-Cr-Y-Ce-V to enhance the high-temperature stability of the melt; and it utilizes an oxidizing atmosphere agent to precisely control the iron valence state, promoting Fe²⁺… + →Fe³ + The process involves transformation and the design of a gradient ceramic coating to form a gradient protective structure of mSiO2·nH2O-SiC-Si3N4 on the fiber surface, achieving a synergistic modification effect and thus systematically improving the high-temperature stability of the fiber precursor.

[0005] Specifically, the technical solution adopted in this invention is as follows: a method for preparing high-temperature resistant continuous basalt fibers by multi-component raw material mixing and ceramic coating, the method comprising the following steps:

[0006] (1) Raw material selection: Select one or more neutral igneous rocks with a SiO2 mass percentage content greater than or equal to 54% and less than 66% as the main material, and select one or more basic-intermediate igneous rocks with a SiO2 mass percentage content greater than or equal to 52% and less than 54% as the auxiliary material;

[0007] (2) Raw material ratio: The chemical composition content of the main material and the auxiliary material selected in step (1) is determined by material testing methods. The ratio of the main material and the auxiliary material is determined by the target component content of the mixture. The target component content is as follows: SiO2 56-62%, Al2O3 16-20%, Fe2O3+FeO 7-11%, MgO 6-10%, CaO 5-8%, Na2O 1-3%, K2O 0.5-2%, TiO2 1.5-5%, and Fe2O3 / (Fe2O3+FeO)≥0.45;

[0008] (3) Mixing and processing: Mix, crush, grind, pass through an 80-100 mesh sieve, and homogenize the raw materials in the specified proportions to obtain a mixture. Sampling and testing are conducted to determine whether the actual component content of the mixture is within the target component content range.

[0009] (4) Oxidation control: Determine whether to add or not to add an oxidizing agent based on the ratio of Fe2O3 / (Fe2O3+FeO) in the actual composition of the mixture: when Fe2O3 / (Fe2O3+FeO)≥0.85, do not add an oxidizing agent; when Fe2O3 / (Fe2O3+FeO)<0.85, add an oxidizing agent.

[0010] (5) Selection and addition of high temperature resistant oxides: Based on the actual composition and content of the compound and the expected high temperature resistance of the continuous basalt fiber product, determine the type and amount of high temperature resistant oxides to be added;

[0011] (6) Secondary homogenization treatment: Selected high-temperature resistant oxides and oxidizing agents with particle sizes of the same mesh size as the mixture are mixed with the mixture and homogenized to obtain homogenized powder. The composition content of the homogenized powder satisfies the following: by mass percentage,

[0012] ①SiO2 + ZrO2 + V2O5 = 51% - 56%;

[0013] ②MgO+Nb2O5+Cr2O3+TiO2+REO=15%-30%;

[0014] ③(SiO2+ZrO2+V2O5) / Al2O3=2.8-3.2;

[0015] ④(SiO2+ZrO2+V2O5) / (MgO+CaO+Na2O+K2O)=3.0-3.3;

[0016] ⑤Fe2O3+FeO+TiO+Cr2O3=11%-16%;

[0017] REO represents rare earth oxides in the composition, including CeO2, Y2O3, Sc2O3, La2O3, etc.

[0018] (7) High-temperature resistant modified ceramic phase sizing agent formulation: The following raw materials are mixed evenly according to the mass percentage of the sizing agent to prepare the sizing agent: silica sol 40-50%, methyl phenyl silicone resin 8-12%, polyether modified siloxane 2-4%, titanate coupling agent 3-4%, silane coupling agent 2-3%, aminosilane 0.5-1%, nano silicon carbide 4-6%, nano silicon nitride 2-4%, plate boehmite 1-1.5%, spherical alumina 4-6%, fluorocarbon surfactant 0.3-0.7%, aluminum acetylacetonate 0.3-0.8%, deionized water 15-30%;

[0019] (8) Fiber drawing production: The homogenized powder obtained in step (6) is melted and drawn into fibers, and the sizing agent obtained in step (7) is used for impregnation and coating to obtain continuous basalt fibers.

[0020] As used herein, basic-intermediate igneous rocks and intermediate igneous rocks refer to the conventional rock classification of igneous rocks in this field based on the percentage of silica by mass. Among them, intermediate igneous rocks include andesite or diorite; basic-intermediate igneous rocks include basalt, diabase, gabbro, basaltic andesite, diabase andesite, or pyroxene andesite.

[0021] Furthermore, the mineral composition of the main material and the ingredients is dense or oblique porphyritic, and the ratio of Fe2O3 / (Fe2O3+FeO) is ≥0.45.

[0022] Furthermore, the target component content of the mixture mentioned in step (2) also includes, by mass percentage: mineral composition: plagioclase ≥ 45%, pyroxene ≥ 25%, olivine ≤ 5%, quartz ≤ 15%; chemical composition: K2O ≤ 2.0%, Na2O ≤ 3.0%, SrO ≤ 0.3%, BaO ≤ 0.2%, Cl - ≤0.15%; and the loss on ignition of the mixture is ≤2.0%.

[0023] Furthermore, the oxidizing agent includes, but is not limited to, one or more of the following: MnO2, V2O5, NaNO3, CeO2.

[0024] Furthermore, the amount of the oxidizing atmosphere agent added is 0-3% (by mass percentage of the mixed ingredients). Those skilled in the art can select the amount of oxidizing atmosphere agent added based on the difference between the Fe2O3 / (Fe2O3+FeO) ratio and 0.85.

[0025] Furthermore, the high-temperature resistant oxide includes, but is not limited to, one or more of the following: network formers: SiO2, ZrO2, Al2O3, V2O5, Nb2O5, GeO2; network intermediates: CeO2, Y2O3, Cr2O3, Sc2O3, La2O3, TiO2; network modifiers: MgO.

[0026] Furthermore, the amount of the high-temperature resistant oxide added can be 0-30% (by mass percentage of the mixture), such as 0-20%, 0-10%, etc. The specific amount added can be determined by those skilled in the art based on the actual content of the chemical composition of the mixture and the expected high-temperature resistance of the continuous basalt fiber product.

[0027] Furthermore, in step (4), if the selected oxidizing agent can also be used as a high-temperature resistant oxide, then it is not necessary to add the oxide again in step (5). Therefore, in steps (4) and (5), the same oxide that can be used as both an oxidizing agent and a high-temperature resistant oxide can be selected.

[0028] The high-temperature resistant modified ceramic phase wetting agent formulation used in this invention is a gradient coating design, comprising a five-layer structure: a substrate bonding layer (Si-O-Al bonding), a nanocrystalline barrier layer (SiC, Si3N4 core-shell structure), a stress buffer layer (boehmite / silicone resin core), an oxygen barrier layer (YSZ-doped CeO2), and a surface functional layer (oriented BN nanosheets). By designing such a gradient ceramic coating, a gradient protective structure of mSiO2·nH2O-SiC-Si3N4 can be formed on the fiber surface, achieving a synergistic modification effect with the multi-component blend of basalt fiber ore raw materials, thereby systematically improving the high-temperature stability of continuous basalt fibers.

[0029] Furthermore, the nano-silicon carbide (SiC) used in the wetting agent is pretreated with plasma activation.

[0030] Furthermore, the plasma activation pretreatment includes treatment with Ar:O2 in a ratio of 3:1 to 5:1, at a power of 200-400W, for a time of 5-15 minutes.

[0031] As used herein, the production of homogenized powder into fibers is carried out using conventional processes well known in the art, such as melting, fiber drawing, and impregnation coating. The impregnation coating is performed using the impregnating agent of this invention.

[0032] Furthermore, the process parameters for melting and drawing are: temperature 1420-1480℃, melt viscosity controlled at 120-150 Pa·s, and drawing speed 15-20 m / min.

[0033] Furthermore, the curing process of the impregnation coating includes sequential treatment at the following temperatures: 90-100℃ for 15-25 min, 160-180℃ for 10-20 min, 220-240℃ for 30-50 min, and 250-260℃ for 10-20 min.

[0034] In other respects, the present invention also provides continuous basalt fibers produced by the methods described herein.

[0035] Beneficial effects of the invention

[0036] 1) Improved high-temperature resistance: By adjusting the chemical composition of raw materials through multi-element mineral blending, high-temperature resistant oxides are introduced and the iron valence state is precisely controlled. At the same time, combined with gradient ceramic coating, the high-temperature resistance of continuous basalt fiber is significantly improved, which can meet the requirements of high-end fields for the use of materials in high-temperature environments.

[0037] 2) Optimize raw material utilization: By blending multiple ores, the limitations and defects of a single mineral source are avoided. At the same time, the amount of high-temperature resistant oxides added is reduced, and different mineral resources can be utilized more fully. This reduces production costs and minimizes the impact of raw material fluctuations on product performance.

[0038] 3) Enhanced product stability: Through systematic process improvements, from raw material processing to coating design, the high-temperature stability of continuous basalt fiber precursor has been comprehensively improved, ensuring the consistency and reliability of product quality, which is conducive to large-scale industrial production. Detailed Implementation

[0039] The present invention will be further illustrated below with reference to specific embodiments, but the embodiments do not limit the present invention in any way. Unless otherwise specified, the reagents, methods, and equipment used in the present invention are conventional reagents, methods, and equipment in this technical field.

[0040] Example:

[0041] This invention provides a method for preparing high-temperature resistant continuous basalt fibers by multi-component raw material mixing and ceramic coating, comprising:

[0042] (1) Raw material selection: In this embodiment, the ore from two mining sites, Getanxi diorite in Wanyuan City, Sichuan Province and Xumaya diorite in Yajiang County, Sichuan Province, was selected as the main material, and the diabase ore from Wuyi Village, Jinkouhe District, Sichuan Province was selected as the auxiliary material. Specific information is shown in Table 1.

[0043] Table 1: Mineral Points for Blending Multi-component Raw Materials

[0044] Serial Number Ore site Rock types Remark 1# Getanxi Diorite Mine, Wanyuan City, Sichuan Province diorite Main ingredient 1-1 2# Xuma diorite mine in Yajiang County, Sichuan Province diorite Main ingredients 1-2 3# Wuyi Village Diabase Mine, Jinkouhe District, Sichuan Province diabase Ingredients 2-1

[0045] (2) The chemical composition of each of the mixed ores was determined, and the results are shown in Table 2, where LOI is the measured loss on ignition.

[0046] Table 2: Chemical composition of each blended ore (wt%)

[0047]

[0048] (3) Batching: Based on the target content (56%-62% SiO2, 16%-20% Al2O3, 7%-11% (Fe2O3+FeO), 6%-10% MgO, 5%-8% CaO, 1.0%-3.0% Na2O, 0.5%-2.0% K2O, 1.5%-5% TiO2; Fe2O3 / (Fe2O3+FeO)≥0.45), the wt% of each ore in the mixture was calculated according to the chemical composition of each ore in Table 2. The results are shown in Table 3. 50 parts of 1-1# main material, 40 parts of 1-2# main material, and 10 parts of 2-1# batching material were weighed and mixed according to wt%. The comparison ratio consisted only of a single ore material, diabase (batching material) from Wuyi Village, Jinkouhe District, Sichuan Province.

[0049] Table 3: Weight percentage of blended ores (wt%)

[0050] Ore Points Examples 1-5 Comparative Example-2 1-1# (Main) 50 0 1-2# (Main) 40 0 2-1# (matching) 10 100

[0051] (4) Mixing test: The mixtures of Examples 1-5 were crushed, ground, and sieved (80-100 mesh) and then sampled for testing to ensure that the content of each component in the mixture was within the required range (if the requirements were not met, secondary mixing was required) to obtain the mixed powder. The test results of the content of each chemical component in the mixtures obtained in Examples 1-5 and the minerals of the comparative example are shown in Table 4.

[0052] Table 4: Content of each component after ore blending (wt%)

[0053]

[0054] (5) Oxidation Regulation: Based on the Fe2O3 / (Fe2O3+FeO) ratio of the mixtures in Examples 1-5 being 0.547, and calculated by wt%, three composite oxidizing agents were selected to be added to all the mixtures in the examples: 0.6% NaNO3, 1.0% V2O5, and (0.5%-1.5%) CeO2. The added V2O5 and CeO2 serve as both oxidation regulators and high-temperature resistant oxides. The specific addition amounts are shown in Table 5.

[0055] (6) Selection and addition of high-temperature resistant oxides: Based on the content of each major chemical component in the mixture, high-temperature resistant oxides (wt%) as listed in Table 5 were added to the mixtures of Examples 1-5 respectively. The mixtures of each example after adding the oxidizing agent and the high-temperature resistant oxide were subjected to secondary homogenization treatment, wherein the particle size of the added oxidizing agent and the high-temperature resistant oxide was the same as that of the mixture.

[0056] Table 5: Oxidizing agents and high-temperature resistant oxides added to the mixed powders of each embodiment (wt%)

[0057]

[0058] (7) Formulation of high-temperature resistant improved ceramic phase wetting agent: see Table 6. Among them, nano silicon carbide is activated by plasma with Ar:O2=4:1, power 300W, time 10min.

[0059] Table 6: Formulation of Improved Ceramic Phase Wetting Agent Coating (wt%)

[0060]

[0061] (8) Fiber production: Fiber production is carried out by melting, drawing, and impregnation coating to obtain continuous basalt fibers. The homogenized powder obtained in step (6) is used for melting and drawing, and the impregnation coating is prepared in step (7). The melting process parameters are: temperature 1420-1480℃, melt viscosity controlled at 120-150 Pa·s, and drawing speed 15-20 m / min; the coating curing process is: 90-100℃ / 15-25min→160-180℃ / 10-20min→220-240℃ / 30-50min→250-260℃ / 10-20min.

[0062] (9) Performance testing: The prepared continuous basalt fibers were tested. The main test items included the tensile strength, tensile elastic modulus, and strength retention rate after high temperature treatment. The test results are shown in Table 7.

[0063] Table 7: Properties of continuous basalt fiber precursors prepared in each example

[0064]

[0065]

[0066] As can be seen from the data in Table 7, the differences in the types and contents of high-temperature resistant oxides added in different embodiments, as well as the application of gradient ceramic coatings, have a significant impact on the performance of continuous basalt fibers.

[0067] Tensile strength: Compared to the comparative examples, the tensile strength of all embodiments showed a very significant improvement. Furthermore, with the gradual increase in the amount of high-temperature resistant oxides such as Al2O3, Cr2O3, MgO, TiO2, ZrO2, and Y2O3 added, the tensile strength of Examples 1-5 gradually increased from 3185 MPa to 3530 MPa. This indicates that these high-temperature resistant oxides can effectively enhance the structural stability within the fiber, resulting in stronger interatomic bonding when the fiber is under tensile stress, thereby improving the tensile strength.

[0068] Tensile modulus of elasticity: Compared to the comparative examples, the tensile modulus of elasticity in all embodiments showed a very significant improvement. From Example 1 to Example 5, the tensile modulus of elasticity increased from 89.5 GPa to 95.4 GPa, which is closely related to the addition of high-temperature resistant oxides. Oxides such as Al2O3 and Y2O3 can improve the crystal structure of the fiber, increase the bond energy between atoms, and make the fiber less prone to elastic deformation under stress, thereby improving the tensile modulus of elasticity. Among them, Y2O3 can enter the crystal lattice structure of the fiber to form a solid solution, enhance the rigidity of the crystal lattice, and play an important role in improving the tensile modulus of elasticity.

[0069] Tensile breaking strength and strength retention rate of yarns after heat treatment: Comparing the tensile breaking strength and strength retention rate of yarns produced by Comparative Examples 1 and 2 using the same compound and process but with different impregnating agents after heat treatment, it can be seen that the tensile breaking strength and strength retention rate of yarns in Comparative Example 2 (400℃) after heat treatment are significantly higher than those in Comparative Example 1. This is because the gradient ceramic coating provides significant protection. Meanwhile, the strength retention rate of Examples 1-5 after high-temperature treatment is significantly higher than that of the comparative examples, and the strength retention rate gradually increases with the optimization of the amount of high-temperature resistant oxide added. This is because these high-temperature resistant oxides can stabilize the fiber structure at high temperatures, inhibit crystal growth and defect generation, thereby effectively reducing the degradation of fiber properties caused by high temperatures.

[0070] In summary, by rationally selecting and adding high-temperature resistant oxides and simultaneously designing gradient ceramic coatings, the tensile strength, tensile modulus of elasticity, and strength retention rate after high-temperature treatment of continuous basalt fibers can be significantly improved, effectively enhancing the high-temperature resistance and comprehensive mechanical properties of the fibers.

[0071] The continuous basalt fibers prepared in all embodiments of the present invention have the following advantages compared with the continuous basalt fibers prepared using a single diabase ore raw material from Wuyi Village, Jinkouhe District, Sichuan Province, combined with a common sizing agent coating.

[0072] (i) It has high high temperature resistance. Comparative Example 2 only used a high temperature resistant modified ceramic phase impregnating agent, and the high temperature resistance of its fiber filaments reached the performance index of BTRⅠ high temperature resistant basalt fiber in "Classification and Grading of Basalt Fibers and Codes" (GB / T38111-2019); The continuous basalt fibers prepared in Examples 1-5 showed excellent tensile breaking strength and strength retention rate after heat treatment (120 min) in an extreme environment (600℃) exceeding the test standard (400℃).

[0073] (ii) It has a relatively low melting temperature, molding temperature and liquidus temperature suitable for industrial production. In the process of multi-component compounding, the reasonable combination of raw materials reduces the energy demand of the system. At the same time, it reserves the interaction space for the addition of high-temperature resistant oxides, and the introduction of trace amounts of oxidizing atmosphere agents helps to reduce the viscosity of the melt and improve its fluidity, so that good melting and molding processes can be achieved at lower temperatures, which is conducive to energy saving and process control in industrial production.

[0074] (III) Higher filament yield and full-bottle rate ensure the economic benefits of producing high-temperature resistant raw filament products. Multi-component blending reduces production instability caused by defects in single ore raw materials. The synergistic effect of high-temperature resistant oxides and oxidizing agents further improves the stability of the production process. At the same time, the application of high-temperature resistant modified ceramic phase wetting agent makes the fibers easier to form and more stable in quality during the production process, thereby improving the filament yield and full-bottle rate.

[0075] It should be noted that while the preferred embodiments of the present invention are provided in this specification, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of the present invention; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of the present invention. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of the present invention. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A method for preparing high-temperature resistant continuous basalt fibers by multi-component raw material mixing and ceramic coating, characterized in that, The method includes the following steps: (1) Raw material selection: Select one or more neutral igneous rocks with a SiO2 mass percentage content greater than or equal to 54% and less than 66% as the main material, and select one or more basic-intermediate igneous rocks with a SiO2 mass percentage content greater than or equal to 52% and less than 54% as the auxiliary material; (2) Raw material ratio: The chemical composition content of the main material and the auxiliary material selected in step (1) is determined by material testing methods. The ratio of the main material and the auxiliary material is determined by the target component content of the mixture. The target component content is as follows: SiO2 56-62%, Al2O3 16-20%, Fe2O3+FeO 7-11%, MgO 6-10%, CaO 5-8%, Na2O 1-3%, K2O 0.5-2%, TiO2 1.5-5%, and Fe2O3 / (Fe2O3+FeO)≥0.45; (3) Mixing and processing: Mix, crush, grind, pass through an 80-100 mesh sieve, and homogenize the raw materials in the specified proportions to obtain a mixture. Sampling and testing are conducted to determine whether the actual component content of the mixture is within the target component content range. (4) Oxidation control: Based on the ratio of Fe2O3 / (Fe2O3+FeO) in the actual composition of the mixture, determine whether to add or not to add an oxidizing atmosphere agent: when Fe2O3 / (Fe2O3+FeO)≥0.85, no oxidizing atmosphere agent is added; when Fe2O3 / (Fe2O3+FeO)<0.85, 0.1-3wt% of an oxidizing atmosphere agent is added, wherein the oxidizing atmosphere agent is composed of NaNO3, V2O5 and CeO2. (5) Addition of high temperature resistant oxides: The high temperature resistant oxides are composed of V2O5, CeO2, Al2O3, Cr2O3, MgO, TiO2, ZrO2 and Y2O3. The amount of high temperature resistant oxides added is determined according to the actual composition and content of the mixture and the expected high temperature resistance of the continuous basalt fiber product. (6) Secondary homogenization treatment: The high-temperature resistant oxide and oxidizing atmosphere agent are mixed with the compound and homogenized, wherein the particle size of the high-temperature resistant oxide and oxidizing atmosphere agent is the same as that of the compound, to obtain homogenized powder. The composition content of the homogenized powder satisfies: by mass percentage, ①SiO2 + ZrO2 + V2O5 = 51% - 56%; ②MgO+Nb2O5+Cr2O3+TiO2+REO=15%-30%; ③(SiO2+ZrO2+V2O5) / Al2O3=2.8-3.2; ④(SiO2+ZrO2+V2O5) / (MgO+CaO+Na2O+K2O)=3.0-3.3; ⑤Fe2O3+FeO+TiO2+Cr2O3=11%-16%; REO represents rare earth oxides in the composition; (7) High-temperature resistant modified ceramic phase sizing agent formulation: The following raw materials are mixed evenly according to the mass percentage of the sizing agent to prepare the sizing agent. The composition of the sizing agent is as follows: 40-50% silica sol, 8-12% methyl phenyl silicone resin, 2-4% polyether modified siloxane, 3-4% titanate coupling agent, 2-3% silane coupling agent, 0.5-1% aminosilane, 4-6% nano silicon carbide, 2-4% nano silicon nitride, 1-1.5% lamellar boehmite, 4-6% spherical alumina, 0.3-0.7% fluorocarbon surfactant, 0.3-0.8% aluminum acetylacetonate, and 15-30% deionized water; (8) Fiber drawing production: The homogenized powder obtained in step (6) is melted and drawn into fibers, and the sizing agent obtained in step (7) is used for impregnation and coating to obtain continuous basalt fibers.

2. The method according to claim 1, characterized in that, The neutral igneous rocks include andesite or diorite; the basic-intermediate igneous rocks include basalt, diabase, gabbro, basaltic andesite, or pyroxene andesite.

3. The method according to claim 1, characterized in that, The mineral composition of the main ingredients and auxiliary ingredients is dense or oblique porphyritic, and the ratio of Fe2O3 / (Fe2O3+FeO) is ≥0.

45.

4. The method according to claim 1, characterized in that, The loss on ignition of the mixture in step (2) is ≤2.0%.

5. The method according to claim 1, characterized in that, The nano-silicon carbide used in the wetting agent is pretreated with plasma activation.

6. The method according to claim 5, characterized in that, The plasma activation pretreatment includes treatment with Ar:O2 in a ratio of 3:1 to 5:1, at a power of 200-400W, for a time of 5-15 minutes.

7. The method according to claim 1, characterized in that, In step (8), the melting temperature is 1420-1480℃, the melt viscosity is controlled at 120-150Pa・s, and the wire drawing speed is 15-20 m / min.

8. The method according to claim 1, characterized in that, The curing process of the impregnation coating includes sequential treatment at the following temperatures: 90-100℃ for 15-25 min, 160-180℃ for 10-20 min, 220-240℃ for 30-50 min, and 250-260℃ for 10-20 min.

9. A continuous basalt fiber produced by the method of any one of claims 1-8.

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