Preparation process of alumina fiber rope

Abstract

The invention discloses a preparation process of an alumina fiber rope. The preparation process comprises the following steps: S1, preparing raw materials: spinning and compounding the raw materials by adopting a composite formula of a poly (aluminum oxyalkyl) precursor and powder slurry to prepare spinning raw materials; s2, melt spinning: adding the spinning raw materials in the step S1 into a spinning cylinder to prepare an aluminum oxide precursor; s3, sintering ceramization: sintering the alumina precursor in a tubular furnace by adopting a three-section heating system; and S4, weaving and forming: twisting the sintered aluminum oxide filaments into strands according to a certain twist degree, and finally preparing the aluminum oxide fiber rope. The alumina fiber rope prepared by the process has excellent performances of high temperature resistance, high strength, low heat conductivity and the like, and can be widely applied to the fields of aerospace, metallurgy, chemical industry and the like.

Description

Technical Field

[0001] This invention belongs to the field of alumina fiber preparation technology, specifically relating to a preparation process for alumina fiber cord. Background Technology

[0002] Alumina fiber is an important type of polycrystalline refractory fiber. Its internal structure is microcrystalline. Compared to non-oxide fibers such as carbon fiber and silicon carbide fiber, alumina fiber not only possesses excellent properties such as high strength, high modulus, and high temperature resistance, but also exhibits good high-temperature oxidation resistance, corrosion resistance, and electrical insulation. It has been widely used in high-temperature insulation materials, catalyst supports in high-temperature reactions, refractory materials, and as a reinforcing material for resin, metal, and ceramic matrix composites. Typically, polycrystalline alumina fibers used in refractory materials require uniform diameter, with an optimal average diameter of 3-5 μm, minimal slag ball content, and good flexibility and strength. Polycrystalline alumina fibers are usually prepared using the sol-gel method. The sol-gel method uses organometallic compounds, inorganic metal compounds, or mixtures of both as raw materials. Through a hydrolysis and polymerization process, the fibers gradually gel and undergo post-treatment to finally obtain oxides or other compounds.

[0003] Traditional alumina fiber production processes are conducted at high temperatures, which, while achieving excellent high-temperature resistance, have several shortcomings in terms of energy consumption, production efficiency, and environmental safety. Furthermore, existing production processes also suffer from the following problems: commercially available alumina powder has low purity, and the cleaning process is not thorough enough, failing to effectively remove surface impurities and oil, resulting in insufficient coating adhesion. The twisting process lacks precise control over twisting speed and twist ratio, leading to loose fiber bonding and affecting the mechanical properties and durability of the fiber rope. Summary of the Invention

[0004] Purpose of the invention: To address the shortcomings of existing technologies, this invention proposes a preparation process for alumina fiber ropes. The alumina fiber ropes prepared by this process have excellent properties such as high temperature resistance, high strength, and low thermal conductivity, and can be widely used in aerospace, metallurgy, chemical and other fields.

[0005] Technical solution: The preparation process of an alumina fiber rope according to the present invention includes the following steps:

[0006] S1. Raw material preparation: The raw material is prepared by spinning composite formulation of polyaluminoxane precursor and powder slurry.

[0007] S2, Melt spinning: Alumina precursor fiber is prepared by adding the spinning raw material from step S1 into a spinning bobbin;

[0008] S3, Sintering and Ceramization: Alumina precursor wires are sintered in a tube furnace using a three-stage heating process;

[0009] S4. Weaving and shaping: The sintered alumina filaments are twisted into strands at a certain twist to finally produce alumina fiber rope.

[0010] In some embodiments, the preparation method of the polyaluminoxane precursor includes: placing polyaluminoxane in a reaction vessel, distilling under reduced pressure at 60-100°C for 1-2 hours, raising the temperature to 110-140°C and holding for 2 hours, then raising the temperature to 150-200°C until the softening point reaches 90-125°C, and cooling to room temperature under nitrogen protection to obtain the product.

[0011] In some embodiments, the preparation method of the powder slurry includes: mixing a dispersant, aluminum-containing powder and solvent in a mass ratio of 1:(2-3):(4-5), and then grinding the mixture in a sand mill at a frequency of 40-60Hz for 4-6 hours to form a uniform slurry.

[0012] In some embodiments, the dispersant is prepared by refluxing polyaluminoxane and polyethylene glycol in isopropanol at a ratio of 1:(0.4-0.6) for 2 hours.

[0013] In some embodiments, the aluminum-containing powder is selected as a mixture of 30-200nm γ-Al2O3 and mullite.

[0014] In some embodiments, the solvent is anhydrous ethanol and ethylene glycol ethyl ether mixed in a ratio of 1:(1-2).

[0015] In some embodiments, step S2 melt spinning specifically includes: adding the spinning raw material to the spinning cylinder, heating it to 160-170℃ under nitrogen protection to melt it, degassing it for 30 minutes, and then extruding it through a Φ0.2-0.4mm spinneret at 120-140℃, with the take-up speed controlled at 80-120m / min, to obtain a continuous alumina precursor with a diameter of 10-15μm.

[0016] In some embodiments, step S2 is followed by a temperature resistance treatment: the alumina precursor is placed in a constant temperature and humidity chamber and kept at 30-35°C and 35-40% relative humidity for 1 hour, then heated to 70-80°C and 80-90% relative humidity for 40-60 minutes to improve the fiber’s temperature resistance through hydroxyl crosslinking reaction, and then cooled to room temperature for use.

[0017] In some embodiments, step S3 specifically includes: sintering in a tube furnace using a three-stage heating process.

[0018] Low temperature section: room temperature → 120-130℃, heating rate 5℃ / min, heat preservation for 4-6h, to remove adsorbed water and residual organic matter from the fiber;

[0019] Medium temperature range: 130℃→600-650℃, heating rate 20℃ / min, holding for 2-3 hours, to achieve precursor pyrolysis and preliminary alumina crystal transformation;

[0020] High temperature range: 650℃→1400-1450℃, heating rate 3℃ / min, holding for 3h, promoting the conversion of γ-Al2O3 to α-Al2O3, forming ceramic fibers with crystallinity ≥95%, and the fiber strength can reach 1.8-2.2GPa after cooling at room temperature.

[0021] In some implementations, step S4 specifically includes:

[0022] The sintered alumina filaments are twisted into strands at a twist rate of 80-100 twists / m, and then woven in groups of 12-16 strands using a rapier loom with a weaving density of 20-25 strands / cm to produce fiber cords with a diameter of 5-20mm.

[0023] Beneficial effects: The beneficial effects of this invention are as follows:

[0024] (1) The raw materials of the present invention are made by using an aluminum oxide alkyl precursor and a powder slurry composite formulation to produce spinning raw materials. The raw materials are of high purity and free from impurities and oil stains, which ensures the high purity performance of the subsequent raw yarn and improves the temperature resistance and high strength of the raw yarn.

[0025] (2) In the sintering ceramicization process of the present invention, sintering is carried out in a tube furnace by adopting a three-stage heating system, thereby forming ceramic fibers with a crystallinity of ≥95% and a fiber strength of 1.8-2.2 GPa after cooling at room temperature;

[0026] (3) The alumina fiber rope prepared by the process of the present invention has excellent properties such as high temperature resistance, high strength and low thermal conductivity. It can be widely used in aerospace, metallurgy and chemical fields, and can also be used in the manufacture of safety protection products such as fireproof curtains, fireproof safety belts and fireproof nets. Detailed Implementation

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] A process for preparing alumina fiber rope includes the following steps:

[0030] S1. Raw material preparation: The raw material is prepared by spinning composite formulation of polyaluminoxane precursor and powder slurry.

[0031] The preparation method of the polyaluminoxane precursor includes: placing polyaluminoxane in a reaction vessel, distilling under reduced pressure at 60°C for 1 hour, raising the temperature to 110°C and holding for 2 hours, then raising the temperature to 150°C until the softening point reaches 90°C, and cooling to room temperature under nitrogen protection.

[0032] The preparation method of the powder slurry includes: mixing a dispersant, aluminum-containing powder and solvent in a mass ratio of 1:2:4, and then grinding the mixture in a sand mill at a frequency of 40Hz for 4 hours to form a uniform slurry; wherein the dispersant is prepared by refluxing polyaluminoxane and polyethylene glycol in isopropanol at a ratio of 1:0.4 for 2 hours; the aluminum-containing powder is a mixture of 30-200nm γ-Al2O3 and mullite; and the solvent is anhydrous ethanol and ethylene glycol ethyl ether mixed in a ratio of 1:1.

[0033] The final spinning raw material was obtained by mixing polyaluminoxane precursor with powder slurry at a mass ratio of 70:30, followed by vacuum distillation at 160°C for 1 hour to remove residual solvent.

[0034] S2, Melt spinning: Alumina precursor fiber is prepared by adding the spinning raw material from step S1 to a spinning bobbin.

[0035] The spinning raw material is added to the spinning cylinder, heated to 160℃ under nitrogen protection to melt, and after degassing for 30 minutes, it is extruded through a Φ0.2-0.4mm spinneret at 120℃. The take-up speed is controlled at 80m / min to obtain continuous alumina precursor with a diameter of 10-15μm.

[0036] S3. Temperature resistance treatment: The alumina precursor fiber is placed in a constant temperature and humidity chamber and kept at 30℃ and 35% relative humidity for 1 hour. Then, it is heated to 70℃ and 80% relative humidity for 40 minutes to improve the fiber's temperature resistance through hydroxyl crosslinking reaction. After cooling to room temperature, it is ready for use.

[0037] S4. Sintering and Ceramization: Alumina precursor wires are sintered in a tube furnace using a three-stage heating process.

[0038] Low temperature section: room temperature → 130℃, heating rate 5℃ / min, heat preservation for 4h, to remove adsorbed water and residual organic matter from the fiber;

[0039] Medium temperature range: 130℃→650℃, heating rate 20℃ / min, holding for 2h, to achieve precursor pyrolysis and preliminary alumina crystal transformation;

[0040] High temperature range: 650℃→1400℃, heating rate 3℃ / min, holding for 3h, promoting the conversion of γ-Al2O3 to α-Al2O3, forming ceramic fibers with crystallinity ≥95%, and the fiber strength can reach 1.8-2.2GPa after cooling at room temperature.

[0041] S5. Weaving and Forming: The sintered alumina filaments are twisted into strands at a twist rate of 80 twists / m, and then woven in groups of 12 strands using a rapier loom. The weaving density is controlled at 20 strands / cm to obtain alumina fiber rope with a diameter of 5mm. To improve the high-temperature corrosion resistance of the fiber rope, the rope body can be impregnated with nepheline gel (lithium salt: aluminum salt: tetraethyl orthosilicate = 1:2:3, pH = 3-4, prepared in a water bath at 50-60℃), and heat-treated at 1000-1100℃ for 2 hours to form a coating layer. The final product can withstand temperatures above 1600℃.

[0042] Example 2

[0043] A process for preparing alumina fiber rope includes the following steps:

[0044] S1. Raw material preparation: The raw material is prepared by spinning composite formulation of polyaluminoxane precursor and powder slurry.

[0045] The preparation method of the polyaluminoxane precursor includes: placing polyaluminoxane in a reaction vessel, distilling under reduced pressure at 75°C for 1.5 h, raising the temperature to 120°C and holding for 2 h, raising the temperature to 160°C until the softening point reaches 100°C, and cooling to room temperature under nitrogen protection to obtain the product.

[0046] The preparation method of the powder slurry includes: mixing a dispersant, aluminum-containing powder and solvent in a mass ratio of 1:2.5:4.5, and then grinding the mixture in a sand mill at a frequency of 45Hz for 4.5 hours to form a uniform slurry; wherein the dispersant is prepared by refluxing polyaluminoxane and polyethylene glycol in isopropanol at a ratio of 1:0.45 for 2 hours; the aluminum-containing powder is a mixture of 30-200nm γ-Al2O3 and mullite; the solvent is anhydrous ethanol and ethylene glycol ethyl ether mixed in a ratio of 1:1.5.

[0047] The final spinning raw material was obtained by mixing polyaluminoxane precursor with powder slurry at a mass ratio of 70:30, followed by vacuum distillation at 165°C for 1 hour to remove residual solvent.

[0048] S2, Melt spinning: Alumina precursor fiber is prepared by adding the spinning raw material from step S1 to a spinning bobbin.

[0049] The spinning raw material is added to the spinning cylinder, heated to 165℃ under nitrogen protection to melt, and after degassing for 30 minutes, it is extruded through a Φ0.2-0.4mm spinneret at 125℃. The take-up speed is controlled at 90m / min to obtain continuous alumina precursor with a diameter of 10-15μm.

[0050] S3. Temperature resistance treatment: The alumina precursor fiber is placed in a constant temperature and humidity chamber and kept at 32℃ and 37% relative humidity for 1 hour. Then, it is heated to 75℃ and 85% relative humidity for 45 minutes to improve the temperature resistance of the fiber through hydroxyl crosslinking reaction. After cooling to room temperature, it is ready for use.

[0051] S4. Sintering and Ceramization: Alumina precursor wires are sintered in a tube furnace using a three-stage heating process.

[0052] Low temperature section: room temperature → 130℃, heating rate 5℃ / min, holding for 4.5h, to remove adsorbed water and residual organic matter from the fiber;

[0053] Medium temperature range: 130℃→650℃, heating rate 20℃ / min, holding time 2.5h, to achieve precursor pyrolysis and preliminary alumina crystal transformation;

[0054] High temperature range: 650℃→1420℃, heating rate 3℃ / min, holding for 3h, promoting the conversion of γ-Al2O3 to α-Al2O3, forming ceramic fibers with crystallinity ≥95%, and the fiber strength can reach 1.8-2.2GPa after cooling at room temperature.

[0055] S5. Weaving and Forming: The sintered alumina filaments are twisted into strands at a twist rate of 85 twists / m, and then woven in groups of 14 strands using a rapier loom. The weaving density is controlled at 22 strands / cm to produce alumina fiber rope with a diameter of 10mm. To improve the high-temperature corrosion resistance of the fiber rope, the rope body can be impregnated with nepheline gel (lithium salt: aluminum salt: tetraethyl orthosilicate = 1:2:3, pH = 3-4, prepared in a water bath at 50-60℃), and heat-treated at 1000-1100℃ for 2 hours to form a coating layer. The final product can withstand temperatures above 1600℃.

[0056] Example 3

[0057] A process for preparing alumina fiber rope includes the following steps:

[0058] S1. Raw material preparation: The raw material is prepared by spinning composite formulation of polyaluminoxane precursor and powder slurry.

[0059] The preparation method of the polyaluminoxane precursor includes: placing polyaluminoxane in a reaction vessel, distilling under reduced pressure at 85°C for 1.5 h, raising the temperature to 130°C and holding for 2 h, raising the temperature to 175°C until the softening point reaches 110°C, and cooling to room temperature under nitrogen protection to obtain the product.

[0060] The preparation method of the powder slurry includes: mixing a dispersant, aluminum-containing powder and solvent in a mass ratio of 1:2.5:4.5, and then grinding the mixture in a sand mill at a frequency of 50Hz for 5.5 hours to form a uniform slurry; wherein the dispersant is prepared by refluxing polyaluminoxane and polyethylene glycol in isopropanol at a ratio of 1:(0.4-0.6) for 2 hours; the aluminum-containing powder is a mixture of 30-200nm γ-Al2O3 and mullite; the solvent is anhydrous ethanol and ethylene glycol ethyl ether mixed at a ratio of 1:1.8.

[0061] The final spinning raw material was obtained by mixing polyaluminoxane precursor with powder slurry at a mass ratio of 70:30, followed by vacuum distillation at 170°C for 1 hour to remove residual solvent.

[0062] S2, Melt spinning: Alumina precursor fiber is prepared by adding the spinning raw material from step S1 to a spinning bobbin.

[0063] The spinning raw material is added to the spinning cylinder and heated to 165℃ under nitrogen protection to melt. After degassing for 30 minutes, it is extruded through a Φ0.2-0.4mm spinneret at 135℃. The take-up speed is controlled at 110m / min to obtain continuous alumina precursor with a diameter of 10-15μm.

[0064] S3. Temperature resistance treatment: The alumina precursor fiber is placed in a constant temperature and humidity chamber and kept at 33℃ and 38% relative humidity for 1 hour. Then, it is heated to 78℃ and 85% relative humidity for 55 minutes to improve the fiber's temperature resistance through hydroxyl crosslinking reaction. After cooling to room temperature, it is ready for use.

[0065] S4. Sintering and Ceramization: Alumina precursor wires are sintered in a tube furnace using a three-stage heating process.

[0066] Low temperature section: room temperature → 130℃, heating rate 5℃ / min, holding for 5.5h, to remove adsorbed water and residual organic matter from the fiber;

[0067] Medium temperature range: 130℃→650℃, heating rate 20℃ / min, holding time 2.5h, to achieve precursor pyrolysis and preliminary alumina crystal transformation;

[0068] High temperature range: 650℃→1430℃, heating rate 3℃ / min, holding for 3h, promoting the transformation of γ-Al2O3 to α-Al2O3, forming ceramic fibers with crystallinity ≥95%, and the fiber strength can reach 1.8-2.2GPa after cooling at room temperature.

[0069] S5. Weaving and Forming: The sintered alumina filaments are twisted into strands at a twist rate of 95 twists / m, and then woven in groups of 14 strands using a rapier loom. The weaving density is controlled at 24 strands / cm to produce alumina fiber rope with a diameter of 16mm. To improve the high-temperature corrosion resistance of the fiber rope, the rope body can be impregnated with nepheline gel (lithium salt: aluminum salt: tetraethyl orthosilicate = 1:2:3, pH = 3-4, prepared in a water bath at 50-60℃), and heat-treated at 1000-1100℃ for 2 hours to form a coating layer. The final product can withstand temperatures above 1600℃.

[0070] Example 4

[0071] A process for preparing alumina fiber rope includes the following steps:

[0072] S1. Raw material preparation: The raw material is prepared by spinning composite formulation of polyaluminoxane precursor and powder slurry.

[0073] The preparation method of the polyaluminoxane precursor includes: placing the polyaluminoxane in a reaction vessel, distilling it under reduced pressure at 100°C for 2 hours, raising the temperature to 140°C and holding it for 2 hours, then raising the temperature to 200°C until the softening point reaches 125°C, and cooling it to room temperature under nitrogen protection.

[0074] The preparation method of the powder slurry includes: mixing a dispersant, aluminum-containing powder and solvent in a mass ratio of 1:3:5, and then grinding the mixture in a sand mill at a frequency of 60Hz for 6 hours to form a uniform slurry; wherein the dispersant is prepared by refluxing polyaluminoxane and polyethylene glycol in isopropanol at a ratio of 1:0.6 for 2 hours; the aluminum-containing powder is a mixture of 30-200nm γ-Al2O3 and mullite; the solvent is anhydrous ethanol and ethylene glycol ethyl ether mixed in a ratio of 1:2.

[0075] The final spinning raw material was obtained by mixing polyaluminoxane precursor and powder slurry at a mass ratio of 70:30, followed by vacuum distillation at 180°C for 1 hour to remove residual solvent.

[0076] S2, Melt spinning: Alumina precursor fiber is prepared by adding the spinning raw material from step S1 to a spinning bobbin.

[0077] The spinning raw material is added to the spinning cylinder, heated to 170℃ under nitrogen protection to melt, and after degassing for 30 minutes, it is extruded through a Φ0.2-0.4mm spinneret at 140℃. The take-up speed is controlled at 120m / min to obtain continuous alumina precursor with a diameter of 10-15μm.

[0078] S3. Temperature resistance treatment: The alumina precursor fiber is placed in a constant temperature and humidity chamber and kept at 35℃ and 40% relative humidity for 1 hour. Then, it is heated to 80℃ and 90% relative humidity for 60 minutes to improve the fiber's temperature resistance through hydroxyl crosslinking reaction. After cooling to room temperature, it is ready for use.

[0079] S4. Sintering and Ceramization: Alumina precursor wires are sintered in a tube furnace using a three-stage heating process.

[0080] Low temperature section: room temperature → 130℃, heating rate 5℃ / min, heat preservation for 6h, to remove adsorbed water and residual organic matter from the fiber;

[0081] Medium temperature range: 130℃→650℃, heating rate 20℃ / min, holding for 3h, to achieve precursor pyrolysis and preliminary alumina crystal transformation;

[0082] High temperature range: 650℃→1450℃, heating rate 3℃ / min, holding for 3h, promoting the conversion of γ-Al2O3 to α-Al2O3, forming ceramic fibers with crystallinity ≥95%, and the fiber strength can reach 1.8-2.2GPa after cooling at room temperature.

[0083] S5. Weaving and Forming: The sintered alumina filaments are twisted into strands at a twist rate of 100 twists / m, and then woven in groups of 16 strands using a rapier loom. The weaving density is controlled at 25 strands / cm to produce alumina fiber rope with a diameter of 20mm. To improve the high-temperature corrosion resistance of the fiber rope, the rope body can be impregnated with nepheline gel (lithium salt: aluminum salt: tetraethyl orthosilicate = 1:2:3, pH = 3-4, prepared in a water bath at 50-60℃), and heat-treated at 1000-1100℃ for 2 hours to form a coating layer. The final product can withstand temperatures above 1600℃.

[0084] The following are the performance parameters of the alumina fiber ropes prepared in the above embodiments.

[0085] Single filament diameter (μm) Rope diameter (mm) Monofilament strength (GPa) Elongation at break (%) Heat resistance temperature (°C) Thermal conductivity (W / m·K) Example 1 10 5 1.8 0.63 1600 0.18 Example 2 11 10 1.9 0.75 1650 0.16 Example 3 12 16 2.0 0.86 1680 0.15 Example 4 15 20 2.2 0.98 1700 0.16

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A process for preparing alumina fiber rope, characterized in that: Includes the following steps: S1. Raw material preparation: The raw material is prepared by spinning composite formulation of polyaluminoxane precursor and powder slurry. S2, Melt spinning: Alumina precursor fiber is prepared by adding the spinning raw material from step S1 into a spinning bobbin; S3, Sintering and Ceramization: Alumina precursor wires are sintered in a tube furnace using a three-stage heating process; S4. Weaving and shaping: The sintered alumina filaments are twisted into strands at a certain twist to finally produce alumina fiber rope.

2. The preparation process of an alumina fiber rope according to claim 1, characterized in that: The preparation method of the polyaluminoxane precursor includes: placing polyaluminoxane in a reaction vessel, distilling under reduced pressure at 60-100℃ for 1-2 hours, raising the temperature to 110-140℃ and holding for 2 hours, then raising the temperature to 150-200℃ until the softening point reaches 90-125℃, and cooling to room temperature under nitrogen protection to obtain the product.

3. The preparation process of an alumina fiber rope according to claim 1, characterized in that: The preparation method of the powder slurry includes: mixing dispersant, aluminum-containing powder and solvent in a mass ratio of 1:(2-3):(4-5), and then grinding the mixture in a sand mill at a frequency of 40-60Hz for 4-6 hours to form a uniform slurry.

4. The preparation process of an alumina fiber rope according to claim 3, characterized in that: The dispersant was prepared by refluxing polyaluminoxane and polyethylene glycol in isopropanol at a ratio of 1:(0.4-0.6) for 2 hours.

5. The preparation process of an alumina fiber rope according to claim 3, characterized in that: The aluminum-containing powder is a mixture of 30-200nm γ-Al2O3 and mullite.

6. The preparation process of an alumina fiber rope according to claim 3, characterized in that: The solvent is anhydrous ethanol and ethylene glycol ethyl ether mixed in a ratio of 1:(1-2).

7. The preparation process of an alumina fiber rope according to claim 1, characterized in that: Step S2 melt spinning specifically includes: adding the spinning raw material into the spinning cylinder, heating it to 160-170℃ under nitrogen protection to melt it, degassing it for 30 minutes, and then extruding it through a Φ0.2-0.4mm spinneret at 120-140℃, with the take-up speed controlled at 80-120m / min, to obtain a continuous alumina precursor with a diameter of 10-15μm.

8. The preparation process of an alumina fiber rope according to claim 1, characterized in that: Step S2 is followed by a temperature resistance treatment: the alumina precursor is placed in a constant temperature and humidity chamber and kept at 30-35℃ and 35-40% relative humidity for 1 hour, then heated to 70-80℃ and 80-90% relative humidity for 40-60 minutes to improve the fiber’s temperature resistance through hydroxyl crosslinking reaction. After cooling to room temperature, it is ready for use.

9. The preparation process of an alumina fiber rope according to claim 1, characterized in that: Step S3 specifically includes: sintering in a tube furnace using a three-stage heating process. Low temperature section: room temperature → 120-130℃, heating rate 5℃ / min, heat preservation for 4-6 hours, to remove adsorbed water and residual organic matter from the fiber; Medium temperature range: 130℃→600-650℃, heating rate 20℃ / min, holding for 2-3 hours, to achieve precursor pyrolysis and preliminary alumina crystal transformation; High temperature range: 650℃→1400-1450℃, heating rate 3℃ / min, holding for 3h, promoting the conversion of γ-Al2O3 to α-Al2O3, forming ceramic fibers with crystallinity ≥95%, and the fiber strength can reach 1.8-2.2GPa after cooling at room temperature.

10. The preparation process of an alumina fiber rope according to claim 1, characterized in that: Step S4 specifically includes: The sintered alumina filaments are twisted into strands at a twist rate of 80-100 twists / m, and then woven in groups of 12-16 strands using a rapier loom with a weaving density of 20-25 strands / cm to produce fiber cords with a diameter of 5-20mm.