Preparation method of quartz fiber with lanthanum zirconate microcosmic refractory coating

Abstract

The invention relates to a preparation method of quartz fibers, in particular to a preparation method of quartz fibers with a lanthanum zirconate microcosmic refractory coating. The invention aims to solve the technical problems that the existing method for increasing the use temperature of the quartz fiber is complicated in process, other properties are reduced, and foreign ions are introduced. Lanthanum zirconate with excellent performance is selected as a coating component, the lanthanum zirconate microcosmic refractory coating is prepared on the fiber surface for the first time, and the coating has good high-temperature stability and can provide protection for a fiber base material at the ultrahigh temperature; the introduction of the low-thermal-conductivity component lanthanum zirconate can reduce the high-temperature thermal conductivity of the material. The lanthanum zirconate sol with good uniformity can be prepared only through water bath heating, and the uniformity of the coating is facilitated. The process for preparing the coating through a sol impregnation method is simplified, and meanwhile the impregnation effect is improved. The lanthanum zirconate microcosmic refractory coating is prepared on the surface of the quartz fiber, so that the use temperature of the quartz fiber is increased, and the heat conductivity of the quartz fiber material is reduced.

Description

Technical Field

[0001] The invention relates to a method for preparing quartz fiber. Background Art

[0002] Driven by the urgent need for iterative upgrades in weaponry performance in modern information warfare, the design of aerospace vehicles, including missiles, is rapidly evolving towards hypersonic speeds, long-range precision strikes, and high-mobility operations. As a key structural component of missile guidance systems, the front-end radome is subject to long-term exposure to extreme coupled environments, including high temperature, high pressure, high-frequency vibration, and chemical corrosion. This requires the material to possess not only broadband electromagnetic transparency to ensure stable signal transmission, but also structural load-bearing capacity and thermal protection in high-temperature environments. Quartz fiber, due to its low thermal conductivity, low dielectric constant, low thermal expansion coefficient, and excellent chemical stability, is widely used in high-temperature wave transmission applications. However, quartz fiber has a limited operating temperature, typically below 1100°C. Continued temperature increases can cause the fiber to soften and deform, significantly reducing its thermal insulation and strength. Therefore, improving the temperature resistance of quartz fiber has become a key research topic.

[0003] At present, there are two main common methods to increase the operating temperature of quartz fiber. One is the component control method, which is to dope specific substances into the fiber. After the quartz fiber is doped with nitrogen, the temperature resistance is significantly improved. However, this method is complicated and needs to be controlled in the fiber preparation stage. In addition, it will cause other performance degradations. The other is the surface modification method, which is mostly to prepare a coating on the fiber surface. The method of coating the modified substance before drawing the quartz fiber requires the introduction of an additional coating tank, and it can also only be implemented in the fiber preparation stage. The sol impregnation method is a common method for preparing fiber surface coatings, but adjusting the pH value during the preparation of the sol will introduce impurity ions. In addition, there are certain technical difficulties in ensuring the accuracy of pH adjustment and the uniformity of the sol particles after adjustment. In terms of coating composition, the existing coating components themselves have poor stability and need to add stabilizers, which increases the complexity of the process. Summary of the Invention

[0004] The present invention aims to solve the technical problems of the existing method of increasing the operating temperature of quartz fiber, which is complex, causes other performance degradation, and introduces impurity ions, and provides a method for preparing quartz fiber with a lanthanum zirconate microscopic refractory coating.

[0005] The preparation method of the quartz fiber with a lanthanum zirconate microscopic refractory coating of the present invention is carried out according to the following steps:

[0006] 1. Preparation of lanthanum zirconate solution: Disperse lanthanum source and zirconium source in a mixture of water and anhydrous ethanol to obtain a lanthanum zirconate solution, wherein the concentrations of lanthanum and zirconium are both 0.01 mol / L to 0.1 mol / L;

[0007] 2. Impregnation treatment: Immerse the chopped quartz fiber in the lanthanum zirconate solution prepared in step 1, and immerse in a water bath at 40°C to 80°C with continuous stirring during the immersion process; heating during this process causes the hydrolysis equilibrium to shift to the right, and the lanthanum zirconate solution is converted into a lanthanum zirconate sol; after the water bath ends, let it stand at room temperature to allow the sol particles to fully combine with the quartz fiber to form a lanthanum zirconyl precursor;

[0008] Sintering: Filter the product from step 2 with gauze and dry it in a drying oven. In an air atmosphere, heat the product from room temperature to 800°C–1200°C and maintain this temperature for 2–5 hours before cooling it in the furnace to produce the lanthanum zirconate-modified fiber. During this process, the lanthanum zirconate precursor loses water to form lanthanum zirconate, which forms a dense coating during the high-temperature heat treatment.

[0009] The present invention is based on the high melting point (2300 ° C) and low thermal conductivity (room temperature: 1.56W·m -1 ·K -1 , 1450℃: 1.15W·m -1 ·K -1 ), there is no phase change from room temperature to melting point, lanthanum zirconate is selected as the raw material for refractory coating. The quartz fiber is immersed in the lanthanum zirconate solution, and the water bath heating promotes the hydrolysis of zirconium ions and lanthanum ions to form a lanthanum zirconate sol, which adheres to the fiber surface to form a coating precursor, and is finally sintered to obtain a lanthanum zirconate microscopic refractory coating. In terms of the composition of the coating, lanthanum zirconate has better structural stability and high temperature resistance than components such as yttrium oxide. The combination of quartz and lanthanum zirconate fully utilizes the advantages of refractory materials: low-density quartz fiber as the matrix, and lanthanum zirconate with high melting point and low thermal conductivity as the protective phase, which successfully circumvents the disadvantages of low operating temperature of quartz fiber and the disadvantage of large-scale use of lanthanum zirconate that is not conducive to lightweighting. In terms of the coating preparation process, the characteristic of heating to promote ion hydrolysis is utilized, and the coating sol is prepared by water bath heating method, which eliminates the step of adjusting the pH value and avoids the introduction of additional impurity ions. When preparing the sol using pH adjustment, localized ions tend to combine with the added pH adjuster to form large colloids, making sol uniformity difficult to control. However, the water bath heating method promotes slow and uniform ion hydrolysis, resulting in finer sol particles with a more concentrated particle size distribution, which facilitates uniform coating preparation. Furthermore, the inherent hydroxyl groups on the surface of quartz fiber readily combine with the lanthanum zirconate colloids, forming a coating precursor after dehydration, eliminating the typically required fiber pretreatment step and demonstrating the compatibility of quartz fiber with lanthanum zirconate coatings.

[0010] The present invention selects lanthanum zirconate with excellent performance as a coating component, and prepares a lanthanum zirconate microscopic refractory coating on the fiber surface for the first time. First, lanthanum zirconate has an extremely high melting point and no phase change from room temperature to melting point, which determines that the coating has good high-temperature stability and can provide protection for the fiber substrate at ultra-high temperatures. Secondly, the thermal conductivity of lanthanum zirconate decreases with increasing temperature, and the introduction of lanthanum zirconate, a low thermal conductivity component, can reduce the high-temperature thermal conductivity of the material. If quartz fibers with lanthanum zirconate coatings are assembled into thermal insulation materials, the overlap between the fibers is a high-temperature, low-thermal conductivity lanthanum zirconate component, and the interface between the fiber and the coating increases the thermal resistance, thereby avoiding the formation of a large-scale high-thermal conductivity solid-phase heat conduction path. Third, the present invention optimizes the coating preparation process: when preparing a microscopic coating on the fiber surface using the sol impregnation method, it is usually necessary to pretreat the fiber, adjust the pH value of the sol, and heat it in a water bath. However, the present invention utilizes the characteristics of the quartz fiber surface being rich in hydroxyl groups and easily dehydrated with zirconium ions and lanthanum ions to form a zirconyl lanthanum precursor, thereby eliminating the fiber pretreatment step; in addition, based on the characteristic that heating promotes the right shift of the hydrolysis equilibrium to form a sol, the step of adjusting the pH value is eliminated. The present invention can prepare a lanthanum zirconate sol with good uniformity only by heating in a water bath, which is beneficial to the uniformity of the coating. The present invention simplifies the process of preparing the coating by the sol impregnation method and improves the impregnation effect.

[0011] The present invention optimizes the process of preparing the coating by the sol impregnation method at a low cost, prepares a lanthanum zirconate microscopic refractory coating on the surface of the quartz fiber, increases the operating temperature of the quartz fiber, and reduces the thermal conductivity of the quartz fiber material. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the SEM image of the chopped quartz fiber (unimpregnated) in step 2 of experiment 1;

[0013] Figure 2 This is the SEM image of the lanthanum zirconate modified fiber prepared in step 3 of experiment 1;

[0014] Figure 3 This is the EDS pattern of the lanthanum zirconate modified fiber prepared in step 3 of experiment 1;

[0015] Figure 4 This is the XRD pattern of the lanthanum zirconate modified fiber prepared in step 3 of experiment 1;

[0016] Figure 5 For real photos;

[0017] Figure 6 is the SEM image of product a of experiment 4;

[0018] Figure 7 This is an SEM image of the product after drying and without heat treatment in step 3 of experiment 1;

[0019] Figure 8 This is the SEM image of product b of experiment five;

[0020] Figure 9 The following are actual photos for comparison of high temperature stability;

[0021] Figure 10 The microstructures of unmodified fiber and modified fiber after thermal evaluation at 1200℃ for 3h respectively;

[0022] Figure 11 The figure shows the comparison of thermal conductivity of fibrous materials before and after modification. DETAILED DESCRIPTION

[0023] Specific embodiment 1: This embodiment is a method for preparing a quartz fiber with a lanthanum zirconate microscopic refractory coating, which is specifically carried out according to the following steps;

[0024] 1. Preparation of lanthanum zirconate solution: Disperse lanthanum source and zirconium source in a mixture of water and anhydrous ethanol to obtain a lanthanum zirconate solution, wherein the concentrations of lanthanum and zirconium are both 0.01 mol / L to 0.1 mol / L;

[0025] 2. Impregnation treatment: Immerse the chopped quartz fiber in the lanthanum zirconate solution prepared in step 1, and immerse in a water bath at 40°C to 80°C, stirring continuously during the immersion process; after the water bath, let it stand at room temperature to allow the sol particles to fully combine with the quartz fiber to form a lanthanum zirconate precursor;

[0026] 3. Sintering: Use fine gauze to filter out the product of step 2, and then place it in a drying oven for drying; in an air atmosphere, heat it from room temperature to 800℃~1200℃ and keep it warm for 2h~5h, and finally cool it in the furnace to obtain lanthanum zirconate modified fiber.

[0027] Specific embodiment 2: This embodiment differs from specific embodiment 1 in that the dispersion in step 1 is performed by stirring at room temperature. Other aspects are the same as specific embodiment 1.

[0028] Specific embodiment 3: This embodiment differs from specific embodiment 1 or 2 in that the lanthanum source in step 1 is La(NO3)3·6H2O, La2O3 or LaCl3·6H2O. Other aspects are the same as specific embodiment 1 or 2.

[0029] Specific embodiment 4: This embodiment differs from specific embodiments 1 to 3 in that the zirconium source in step 1 is ZrO2, Zr(NO3)4.5H2O or ZrOCl2.8H2O. Other aspects are the same as specific embodiments 1 to 3.

[0030] Specific embodiment 5: This embodiment differs from specific embodiment 4 in that the molar ratio of water to anhydrous ethanol in step 1 is 1:(1-10). Other aspects are the same as specific embodiment 4.

[0031] Specific Embodiment 6: This embodiment differs from Specific Embodiment 5 in that the method for preparing the chopped quartz fibers described in step 2 is as follows: quartz fibers are added to deionized water at a fiber-to-water ratio of 1:50-100. The fibers are then chopped two to four times in a soymilk maker (to a size of tens to hundreds of microns). After chopping, the fibers are filtered out using gauze and then dried in a drying oven at 50°C-70°C for 24-48 hours. Other aspects are the same as Specific Embodiment 5.

[0032] Specific embodiment 7: This embodiment differs from specific embodiment 6 in that: in step 2, the mixture is immersed in a water bath at 40°C to 80°C for 10 minutes to 30 minutes. Other aspects are the same as specific embodiment 6.

[0033] Specific embodiment eight: This embodiment differs from specific embodiment seven in that in step two, the sol particles are allowed to stand at room temperature for 12 to 24 hours to fully combine with the quartz fiber to form a lanthanum zirconyl oxide precursor. Other aspects are the same as specific embodiment seven.

[0034] Specific embodiment 9: This embodiment differs from specific embodiment 8 in that the drying condition in step 3 is: drying at 50° C. to 80° C. for 24 to 48 hours. Other aspects are the same as specific embodiment 8.

[0035] Specific embodiment 10: This embodiment differs from specific embodiment 9 in that in step 3, the temperature is raised from room temperature to 800°C-1200°C at a rate of 5°C / min in an air atmosphere and maintained at that temperature for 2-5 hours, and finally cooled in the furnace to obtain lanthanum zirconate modified fiber. Other aspects are the same as specific embodiment 9.

[0036] The present invention is verified by the following test:

[0037] Experiment 1: This experiment is a method for preparing a quartz fiber with a lanthanum zirconate micro-refractory coating, which is specifically carried out in the following steps:

[0038] 1. Preparation of lanthanum zirconate solution: Disperse lanthanum source and zirconium source in a mixture of water and anhydrous ethanol to obtain a lanthanum zirconate solution, wherein the concentration of lanthanum and zirconium are both 0.05 mol / L; the dispersion is stirred at room temperature;

[0039] The lanthanum source is La(NO3)3·6H2O; the zirconium source is ZrOCl2·8H2O; the molar ratio of water to anhydrous ethanol is 1:5;

[0040] 2. Impregnation treatment: Immerse the chopped quartz fiber in the lanthanum zirconate solution prepared in step 1 and immerse in a water bath at 60°C for 20 minutes with continuous stirring during the immersion process; after the water bath, let it stand at room temperature for 20 hours to allow the sol particles to fully combine with the quartz fiber to form a lanthanum zirconate precursor;

[0041] The chopped quartz fiber is prepared by adding quartz fiber to deionized water at a fiber to water mass ratio of 1:80, then chopping the fiber four times in a soybean milk maker, filtering out the fiber with gauze, and drying the fiber in a drying oven at 70°C for 24 hours. The fiber size ranges from tens to hundreds of microns.

[0042] 3. Sintering: Use fine gauze to filter out the quartz fiber in the product of step 2, then place the quartz fiber in a drying oven and dry it at 60°C for 48 hours; finally, in an air atmosphere, heat it from room temperature to 1000°C at 5°C / min and keep it at that temperature for 5 hours, and finally cool it in the furnace to obtain lanthanum zirconate modified fiber.

[0043] Figure 1 This is the SEM image of the chopped quartz fiber (unimpregnated) in step 2 of experiment 1. It can be seen from the figure that the surface of the original quartz fiber is smooth and composed of high-purity quartz.

[0044] Figure 2 This is the SEM image of the lanthanum zirconate modified fiber prepared in step three of experiment one. It can be seen from the figure that after impregnation and sintering of the lanthanum zirconate sol, a uniform lanthanum zirconate microscopic refractory coating appears on the surface of the quartz fiber with a thickness of about 100nm~200nm, and the cross-section of the coating is clearly visible.

[0045] Figure 3 This is the EDS image of the lanthanum zirconate modified fiber prepared in step 3 of experiment 1. The EDS results show that zirconium and lanthanum elements are distributed more in the coating-covered part, while only silicon and oxygen elements are distributed in the uncovered part, which proves that the surface of the quartz fiber is indeed a microscopic refractory coating prepared.

[0046] Figure 4 This is the XRD pattern of the lanthanum zirconate-modified fiber prepared in step 3 of experiment 1. It shows that after high-temperature heat treatment, the lanthanum zirconate forms a stable crystalline state, confirming that the fiber surface coating is indeed composed of lanthanum zirconate. The water-bath sol allows the lanthanum zirconate to form a precursor network structure in a liquid environment, increasing the crosslinking of oxygen, zirconium, and lanthanum elements. Subsequently, dehydration at high temperature forms lanthanum zirconate.

[0047] Experiment 2: This experiment uses a water bath heating method to prepare lanthanum zirconate sol (i.e., the method of the present invention, except that no fiber is added). Specifically, the lanthanum zirconate solution prepared in step 1 of Experiment 1 is stirred in a water bath at 60°C for 20 minutes.

[0048] Experiment 3: This experiment is to prepare lanthanum zirconate sol by adjusting the pH value. Specifically, ammonia water is added to the lanthanum zirconate solution prepared in step 1 of experiment 1, and then continuously stirred until the solution becomes an opaque sol.

[0049] Figure 5 The following are photos of actual objects. The bottle on the left shows the lanthanum zirconate solution prepared in step 1 of Experiment 1. It can be seen that the original lanthanum zirconate solution is clear and transparent. The bottle in the middle shows the lanthanum zirconate sol prepared by the water bath heating method in Experiment 2, and the bottle on the right shows the lanthanum zirconate sol prepared by the pH adjustment method in Experiment 3. It can be seen that both the water bath heating method and the pH adjustment method can prepare lanthanum zirconate sol, but the sol obtained by the pH adjustment method is more turbid, indicating that the sol particle size is larger. The sol obtained by the water bath heating method has a lower relative turbidity, indicating that the sol particle size is smaller.

[0050] Experiment 4: Immerse the chopped quartz fiber in the lanthanum zirconate solution prepared in step 1 of experiment 1 for 20 minutes at room temperature with continuous stirring during the immersion process; filter with fine gauze, then place the quartz fiber in a drying oven and dry it at 60°C for 48 hours to obtain product a. Figure 6 This is the SEM image of product a. It can be seen that the ions in the original lanthanum zirconate solution are deposited on the fiber surface and condensed into large lanthanum zirconate particles after drying and dehydration.

[0051] The preparation method of the chopped quartz fiber is as follows: adding quartz fiber to deionized water with a mass ratio of fiber to water of 1:80, then placing the fiber in a soymilk maker and chopping it four times. After the chopping is completed, the fiber is filtered out with gauze and then placed in a drying oven at 70°C for 24 hours. The fiber size ranges from tens to hundreds of microns.

[0052] Figure 7 This is the SEM image of the product after drying and not heat treatment in step 3 of experiment 1. It can be seen that the water bath heating method causes the lanthanum zirconate to sol, and the lanthanum zirconate is deposited on the fiber surface in the form of colloids. It is not easy to condense after drying and dehydration, and the prepared coating has good uniformity.

[0053] Experiment 5: Immerse the chopped quartz fiber in the lanthanum zirconate solution prepared in step 1, then add ammonia water and continue stirring until the solution becomes an opaque sol; filter with fine gauze, then place the quartz fiber in a drying oven and dry at 60°C for 48 hours to obtain product b. Figure 8 This is the SEM image of product b. It can be seen that the colloid particles obtained by the pH adjustment method are larger. Although they can avoid the formation of granules, they are unevenly distributed on the fiber surface.

[0054] The preparation method of the chopped quartz fiber is as follows: adding quartz fiber to deionized water with a mass ratio of fiber to water of 1:80, then placing the fiber in a soymilk maker and chopping it four times. After the chopping is completed, the fiber is filtered out with gauze and then placed in a drying oven at 70°C for 24 hours. The fiber size ranges from tens to hundreds of microns.

[0055] Experiment 6: Conduct high temperature stability test and prepare modified fiber mat. The specific steps are as follows:

[0056] 1. Preparation of slurry: The lanthanum zirconate modified fiber prepared in Experiment 1 was dispersed in a mixture of deionized water and silica sol, and stirred with a stirrer at a speed of 1000 r / min for 15 minutes to fully mix and form a slurry, wherein the amount of lanthanum zirconate modified fiber and silica sol added was 3% and 10% of the mass of deionized water, respectively;

[0057] The preparation steps of the silica sol are as follows: first, tetraethyl orthosilicate is poured into a beaker, then anhydrous ethanol is poured into the beaker, and then water is added to form a mixed solution. Finally, a few drops of dilute hydrochloric acid are added and stirred evenly. Then, the beaker is placed in a 60°C water bath and kept warm for 30 minutes to obtain silica sol. The molar ratio of TEOS: H2O: anhydrous ethanol: HCl is 1:4:4:7.5×10 -4 , the concentration of dilute hydrochloric acid is 0.2mol / L;

[0058] 2. Prepare green billets by pressure drainage: Pour the slurry prepared in step 1 into a mold and let it stand for 10 minutes. After the fibers settle naturally, place a pressing sheet wrapped with gauze (300 mesh) on the top of the mold. The pressing sheet is provided with multiple through holes for drainage. Apply pressure to a certain depth and continue to maintain pressure for 30 seconds to obtain a green billet. Excess water in the slurry is discharged through the through holes on the pressing sheet. Then, place the mold in a refrigerator (about -20°C) and freeze it for 24 hours to ensure that the slurry is completely frozen. Then, place the mold in a freeze dryer (temperature: about -50°C; vacuum degree: 50~100Pa) and freeze-dry it for 72 hours. Finally, place the dried green billet in a muffle furnace and heat-treat it at 1100°C for 4 hours to obtain a modified fiber felt. The density ρ of the modified fiber felt is 0.2 g / cm 3 .

[0059] The steps for preparing the unmodified fiber mat differ from those for preparing the modified fiber mat described above in that, in step 1, the chopped quartz fibers are dispersed in a mixture of deionized water and silica sol. The remaining steps are the same, ultimately yielding the unmodified fiber mat.

[0060] Figure 9Comparative photos of high-temperature stability in Experiment 6. Sample a is an unmodified fiber felt, and sample b is a modified fiber felt. Both samples a and b are 8cm×8cm×1cm. After being subjected to a 1200°C heat test for 3 hours, the unmodified fiber felt (sample c, corresponding to sample a) deformed and shrank severely (55% volume shrinkage), while the modified fiber felt (sample d, corresponding to sample b) showed almost no deformation and only minimal shrinkage (12% volume shrinkage). This demonstrates that lanthanum zirconate micro-refractory coatings can improve the high-temperature stability and operating temperature of quartz fiber products.

[0061] Figure 10 The microstructure of the unmodified fiber felt and the modified fiber felt in experiment 6 after being subjected to thermal evaluation at 1200℃ for 3 hours. Figure 10 The a in Figure 9 The c sample in Figure 10 The b in Figure 9 From the sample d in the figure, it can be seen that the unmodified fiber felt showed behaviors such as shortening and bending after being subjected to the 1200℃ heat test for 3h, and the fiber morphology was greatly damaged ( Figure 10 a). After the modified fiber felt underwent the same thermal evaluation, the surface lanthanum zirconate coating showed crystallization, and the coating was denser, protecting the quartz fiber and maintaining a good fiber morphology ( Figure 10 b).

[0062] Figure 11 The thermal conductivity comparison of fibrous materials before and after modification is shown in the figure. The density ρ of both samples is 0.2 g / cm 3 The blue column is the unmodified fiber, i.e. the chopped quartz fiber in Experiment 1, and its thermal conductivity at room temperature is 0.059 W·m -1 ·K -1 The green column is the modified fiber, which is the lanthanum zirconate modified fiber prepared in step 3 of experiment 1. Its thermal conductivity drops to 0.052 W·m -1 ·K -1 This is due to the low thermal conductivity of lanthanum zirconate and the increase in thermal resistance caused by the increase in material interfaces after coating preparation.

Claims

1. A method for preparing a quartz fiber having a lanthanum zirconate micro-refractory coating, characterized in that The method is carried out according to the following steps:

1. Preparation of lanthanum zirconate solution: Disperse lanthanum source and zirconium source in a mixture of water and anhydrous ethanol to obtain a lanthanum zirconate solution, wherein the concentrations of lanthanum and zirconium are both 0.01 mol / L to 0.1 mol / L; 2. Impregnation treatment: Immerse the chopped quartz fiber in the lanthanum zirconate solution prepared in step 1, and immerse in a water bath at 40°C to 80°C, stirring continuously during the immersion process; after the water bath, let it stand at room temperature to allow the sol particles to fully combine with the quartz fiber to form a lanthanum zirconate precursor; 3. Sintering: Use fine gauze to filter out the product of step 2, and then place it in a drying oven for drying; in an air atmosphere, heat it from room temperature to 800℃~1200℃ and keep it warm for 2h~5h, and finally cool it in the furnace to obtain lanthanum zirconate modified fiber.

2. The method for preparing a quartz fiber having a lanthanum zirconate microscopic refractory coating according to claim 1, characterized in that The dispersion described in step 1 is carried out by stirring at room temperature.

3. The method for preparing a quartz fiber having a lanthanum zirconate microscopic refractory coating according to claim 1, characterized in that The lanthanum source described in step 1 is La(NO3)3·6H2O, La2O3 or LaCl3·6H2O.

4. The method for preparing a quartz fiber having a lanthanum zirconate microscopic refractory coating according to claim 1, characterized in that The zirconium source described in step 1 is ZrO2, Zr(NO3)4·5H2O or ZrOCl2·8H2O.

5. The method for preparing a quartz fiber having a lanthanum zirconate microscopic refractory coating according to claim 1, characterized in that The molar ratio of water to anhydrous ethanol described in step 1 is 1:(1-10).

6. The method for preparing a quartz fiber having a lanthanum zirconate microscopic refractory coating according to claim 1, characterized in that The preparation method of the chopped quartz fiber described in step 2 is as follows: adding the quartz fiber to deionized water with a mass ratio of fiber to water of 1: (50~100), then placing it in a soymilk maker and chopping it 2~4 times, after the chopping is completed, filtering out the fiber with gauze, and then placing it in a drying oven at 50℃~70℃ and drying it for 24h~48h.

7. The method for preparing a quartz fiber having a lanthanum zirconate microscopic refractory coating according to claim 1, characterized in that In step 2, the mixture is immersed in a water bath at 40° C. to 80° C. for 10 min to 30 min.

8. The method for preparing a quartz fiber having a lanthanum zirconate microscopic refractory coating according to claim 1, characterized in that In step 2, the mixture is allowed to stand at room temperature for 12 to 24 hours to allow the sol particles to fully combine with the quartz fibers to form a lanthanum zirconyl oxide precursor.

9. The method for preparing a quartz fiber having a lanthanum zirconate microscopic refractory coating according to claim 1, characterized in that The drying conditions in step 3 are: drying at 50°C to 80°C for 24h to 48h.

10. The method for preparing a quartz fiber having a lanthanum zirconate microscopic refractory coating according to claim 1, characterized in that In step 3, under air atmosphere, the temperature is raised from room temperature to 800°C~1200°C at 5°C / min and kept at this temperature for 2h~5h, and finally cooled in the furnace to obtain lanthanum zirconate modified fiber.

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