Aluminum silicate fiber rope for inhibiting hot salt corrosion and preparation method and application thereof

Abstract

The invention belongs to the technical field of hot salt corrosion resistant materials in a high-temperature environment, and particularly discloses an aluminum silicate fiber rope for inhibiting hot salt corrosion and a preparation method and application of the aluminum silicate fiber rope. Particularly, a layer of dense and uniformly distributed chromium film is deposited on the surface of the aluminum silicate fiber rope through magnetron sputtering, so that the material not only retains the original flexibility and mechanical strength, but also ensures that the product can stably operate for a long time under high-temperature complex working conditions by virtue of the excellent high-temperature oxidation resistance and corrosion resistance of the chromium film; particularly, when the aluminum silicate fiber is applied to titanium alloy protection, chlorine elements in the aluminum silicate fiber can be effectively prevented from migrating to a titanium alloy matrix, and occurrence and development of hot salt corrosion are inhibited. According to the chromium-plated aluminum silicate fiber rope, the hot salt corrosion phenomenon of the titanium alloy can be effectively inhibited, and the high-temperature lasting detection accuracy of the titanium alloy is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat and salt corrosion resistant materials in high temperature environments, and particularly relates to an aluminosilicate fiber rope for inhibiting heat and salt corrosion, a preparation method thereof, and an application thereof. Background Art

[0002] In the process of modern industrial development, titanium alloys are widely used in fields such as aerospace, energy, chemical engineering, and marine due to their high specific strength, excellent corrosion resistance, and good high-temperature mechanical properties. Especially in key components such as aero-engine blades and airframe structural parts, they play an irreplaceable role.

[0003] However, titanium alloys face severe challenges of heat and salt corrosion during actual service. When titanium alloys are under high-temperature stress conditions, especially when exposed to chloride salt pollution, heat and salt corrosion is extremely likely to occur. Heat and salt corrosion will damage the originally protective oxide layer on the surface of titanium alloys, enabling harmful elements in the corrosion products to continuously diffuse into the matrix, thereby causing embrittlement of the material and a significant reduction in strength. This not only significantly affects the endurance life of titanium alloy components but also seriously threatens their service performance. In key high-temperature equipment such as aero-engines, heat and salt corrosion has become one of the key factors leading to component failure, posing a great threat to the safe and stable operation of the equipment.

[0004] To meet the protection requirements of materials in high-temperature environments, in existing high-temperature environmental material protection technologies, aluminosilicate fibers have been widely used in the field of thermal protection due to their low thermal conductivity, high temperature resistance, and light weight. For example, when binding titanium alloy thermocouples in high-temperature environments, the material needs to have good heat insulation performance to ensure the accuracy of titanium alloy thermocouple measurements, and at the same time, it should have a certain degree of flexibility for easy operation; in the scenario of pipeline cladding, it is required that the material can effectively block heat dissipation and adapt to the shape and working conditions of the pipeline. Aluminosilicate fiber ropes can maintain a stable shape under complex high-temperature working conditions with their good flexibility and mechanical strength, meeting the basic requirements of these applications. However, traditional aluminosilicate fiber ropes have a serious defect, that is, they usually contain trace amounts of impurities such as chlorine element (Cl). Under high-temperature conditions, these chlorine elements are extremely likely to chemically react with titanium alloys, becoming the fuse for inducing heat and salt corrosion. This will not only damage the protective layer on the surface of titanium alloys but also accelerate the matrix corrosion, significantly shortening the endurance life of titanium alloys. This problem greatly restricts the further application of aluminosilicate fiber ropes in high-temperature sensitive fields with extremely high protection requirements for titanium alloys.

[0005] Currently, to address the issue of improving high-temperature corrosion, methods such as coating technology and alloy modification have been developed. Although coating technology can provide protection to a certain extent, in practical applications, especially in scenarios such as binding thermocouples under high-temperature conditions, the coating is prone to peeling, and the bonding strength with the substrate is insufficient, making it difficult to play a protective role stably in the long term. Although alloy modification can change the intrinsic properties of materials, it often sacrifices some other characteristics of the materials, such as flexibility, and it is difficult to balance the dual requirements of flexibility and durability in practical applications. Therefore, developing a brand-new aluminosilicate fiber rope that can effectively protect the service performance of titanium alloys in high-temperature environments, especially having a significant effect in resisting hot salt corrosion, has become a technical problem that urgently needs to be solved currently.

[0006] In view of this, this invention is specifically proposed. Summary of the Invention

[0007] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art and provide an aluminosilicate fiber rope for suppressing hot salt corrosion, its preparation method and application. The present invention is mainly used to solve the problem of hot salt corrosion of titanium alloys under high-temperature stress and chloride salt pollution environments, thereby effectively improving the high-temperature creep performance of titanium alloys. In the fields of aerospace, energy, etc. where strict requirements are imposed on the performance of titanium alloys, the aluminosilicate fiber rope with a metal film provided by the present invention has broad application prospects and important practical value.

[0008] The purpose of the present invention is solved by the following technical solutions:

[0009] In the first aspect, the present invention provides a preparation method of an aluminosilicate fiber rope for suppressing hot salt corrosion, and the preparation method includes the following steps:

[0010] Step 1: Raw material treatment and fiber preparation

[0011] First, prepare aluminosilicate raw materials according to a specific ratio, then subject the prepared raw materials to high-temperature melting, and then, by means of spraying or centrifugal spinning, draw the molten material into aluminosilicate fibers under the action of the corresponding air flow or centrifugal force.

[0012] Step 2: Preliminary processing of the fiber rope

[0013] First, cool and twist the aluminosilicate fibers obtained in Step 1 to form an aluminosilicate fiber bundle, then perform spiral braiding on the aluminosilicate fiber bundle to obtain an initial aluminosilicate fiber rope, and then perform drying and heat setting on the initial aluminosilicate fiber rope to obtain an intermediate aluminosilicate fiber rope.

[0014] Step 3: Coating with a metal film

[0015] Using a magnetron sputtering coater, a dense and evenly distributed metal film is magnetron sputtered on the surface of the intermediate aluminum silicate fiber rope obtained in Step 2.

[0016] Further, in Step 1, in the aluminum silicate raw material, the atomic ratio of aluminum, silicon, and oxygen is (1.1 - 1.3):(0.9 - 1.1):(5.3 - 5.9).

[0017] Further, in Step 1, the temperature during the high-temperature melting is 1500°C to 1900°C.

[0018] Further, in Step 1, the sputtering speed during the spraying is 1 nm / s to 10 nm / s;

[0019] The rotation speed during the centrifugal spinning is 500 r / min to 2000 r / min.

[0020] Further, in Step 2, when cooling the aluminum silicate fiber, the temperature is 400°C to 600°C; when twisting, the twist is 50 T / m to 150 T / m.

[0021] Further, in Step 2, when drying the initial aluminum silicate fiber rope, the temperature is set to 100°C to 200°C, and the time is set to 2 h to 6 h;

[0022] When heat-setting the initial aluminum silicate fiber rope, the temperature is set to 300°C to 600°C, and the tension is set to 1 MPa to 5 MPa.

[0023] Further, in Step 3, the model of the magnetron sputtering coater is the ISC150T high-vacuum magnetron sputtering instrument, and the parameters during magnetron sputtering are set as follows: the vacuum degree is 10 3 Pa to 10 5 Pa, the sputtering power is 25 w to 35 w, the sputtering time is 1 h to 1.5 h, and the deposition rate is 8 nm / min to 10 nm / min.

[0024] Further, the metal of the metal film is an inert metal, preferably pure chromium.

[0025] In a second aspect, the present invention also provides an aluminum silicate fiber rope for suppressing hot salt corrosion. The aluminum silicate fiber rope is prepared based on the above-mentioned preparation method, and the diameter of the aluminum silicate fiber rope is 3 mm to 4 mm.

[0026] In a third aspect, the present invention also provides an application of the above-mentioned aluminum silicate fiber rope. The aluminum silicate fiber rope is used for titanium alloy protection to solve the hot salt corrosion problem of titanium alloy under high-temperature stress and chloride salt pollution environment, thereby improving the endurance life of titanium alloy under complex working conditions.

[0027] Preferably, the aluminosilicate fiber rope is used for binding a titanium alloy thermocouple in a high-temperature environment, effectively inhibiting the hot salt corrosion phenomenon of the titanium alloy thermocouple and greatly improving the high-temperature endurance detection accuracy of the titanium alloy thermocouple.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The present invention utilizes a magnetron sputtering coater to deposit a dense and uniformly distributed inert metal (Cr) film on the surface of the aluminosilicate fiber rope by magnetron sputtering. The tight combination of this metal film and the aluminosilicate fiber rope not only retains the original flexibility and mechanical strength of the material, but also ensures that the product can operate stably for a long time under high-temperature and complex working conditions by virtue of the excellent high-temperature oxidation resistance and corrosion resistance of the metal film. In addition, the preparation method provided by the present invention has a clear operation process. By precisely controlling the key parameters such as temperature and time in each step, a high-quality metal-coated aluminosilicate fiber rope can be stably prepared, ensuring the consistency and stability of the product quality and laying a solid foundation for large-scale industrial production.

[0030] 2. The aluminosilicate fiber rope provided by the present invention still maintains its good flexibility and mechanical strength after the metal (Cr) film coating treatment. When it is applied to the protection of titanium alloy, it can be easily wound around the titanium alloy substrate and can withstand a certain external force without breaking or being damaged. At the same time, the chromium-coated aluminosilicate fiber rope wound on the surface of the titanium alloy substrate plays the following key roles: on the one hand, it effectively prevents the chlorine element in the aluminosilicate fiber from migrating to the titanium alloy substrate, thus inhibiting the occurrence and development of hot salt corrosion; on the other hand, the good high-temperature oxidation resistance and corrosion resistance of the chromium film enable it to form a stable chromium sesquioxide protective layer in a high-temperature environment, effectively isolating the corrosive medium from the surface of the titanium alloy and greatly extending the service life of the titanium alloy. Especially when the chromium-coated aluminosilicate fiber rope is applied to a titanium alloy thermocouple, the detection accuracy of the titanium alloy thermocouple is significantly improved.

[0031] 3. The aluminosilicate fiber rope provided by the present invention has a wide range of applications. For example, it provides an effective solution to the hot salt corrosion problems faced by titanium alloys in the fields of aerospace, energy, etc. At the same time, this metal-coated aluminosilicate fiber rope is not only suitable for the protection of titanium alloys, but also has potential application value for other metal materials that serve in high-temperature and high-salt environments and are sensitive to corrosion, expanding its application scope. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings here are incorporated into the specification and form a part of this specification, and are used together with the specification to explain the principles of the present invention.

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 is a flow chart of the preparation method of the aluminosilicate fiber rope of the present invention;

[0035] Figure 2 is a schematic diagram of magnetron sputtering deposition of a metal film during the preparation of the aluminosilicate fiber rope of the present invention;

[0036] Figure 3 is a schematic diagram of tying an object firmly on a titanium alloy thermocouple with the aluminosilicate fiber rope of the present invention;

[0037] Figure 4 are SEM and EDS images at the same position on the surface of Example 1 and Comparative Example 1 of the present invention; among them, (a) is the result after 40 hours of high-temperature corrosion at 500°C / 637 MPa of the aluminosilicate fiber rope of Comparative Example 1 tied to TC25 titanium alloy; (b) is the result after 40 hours of high-temperature corrosion at 500°C / 637 MPa of the aluminosilicate fiber rope with a chromium film of Example 1 tied to TC25 titanium alloy;

[0038] Figure 5 are SEM images of the cross-section of the specimens of Example 1 and Comparative Example 1 of the present invention; among them, (a - c) are 100×, 500×, and 5000× of the aluminosilicate fiber rope of Comparative Example 1 without surface deposition of Cr respectively; (d - f) are 100×, 500×, and 5000× of the aluminosilicate fiber rope of Example 1 with surface deposition of Cr respectively. Detailed Embodiments

[0039] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. On the contrary, they are only examples consistent with some aspects of the present invention detailed in the appended claims.

[0040] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with the drawings and embodiments.

[0041] Please refer to Figures 1 to 5 , a preparation method of an aluminosilicate fiber rope for inhibiting hot salt corrosion provided by the present invention specifically includes the following steps:

[0042] 1) The raw material treatment and fiber preparation process are as follows:

[0043] 1.1) First, materials containing aluminum, silicon and oxygen are selected, weighed and fully mixed according to the atomic ratio of (1.1-1.3): (0.9-1.1): (5.3-5.9), so as to prepare the required aluminum silicate raw material;

[0044] 1.2) The prepared raw materials are then melted at high temperature, and the temperature is controlled at 1500℃~1900℃. In this high temperature range, the raw materials can be fully melted, providing a good foundation for subsequent drawing into fibers;

[0045] 1.3) Then, the molten material is drawn into aluminum silicate fiber by blowing or centrifugal spinning under the action of corresponding airflow or centrifugal force. Since the speed during blowing or the rotation speed during centrifugal spinning are important parameters affecting the fiber diameter and uniformity, the present invention sets the blowing to medium-speed sputtering of 1nm / s to 10nm / s and the rotation speed during centrifugal spinning to 500r / min to 2000r / min, thereby improving the overall performance of the fiber.

[0046] 2) The initial processing of fiber rope is as follows:

[0047] 2.1) First, the aluminum silicate fiber obtained in step 1) is cooled and twisted. Specifically, the temperature during the cooling process is controlled at 400°C to 600°C. The appropriate cooling temperature can make the fiber solidify quickly and maintain good structure and performance; during the twisting process, the twist is controlled at 50T / m to 150T / m. Through reasonable twisting, the loose fibers can be combined into fiber bundles with certain strength and flexibility, which is convenient for subsequent weaving processing;

[0048] 2.2) The twisted aluminum silicate fiber bundle is then spirally braided to obtain an initial aluminum silicate fiber rope;

[0049] 2.3) Then the initial aluminum silicate fiber rope is dried and heat-set. When drying, the temperature is set to 100℃~200℃, and the time is set to 2h~6h. Drying can remove moisture and other volatile substances in the fiber rope and improve the stability and strength of the fiber rope; when heat-setting, the temperature is set to 300℃~600℃, and the tension is set to 1MPa~5MPa. Heat setting can make the structure of the fiber rope more stable and not easy to deform in a high temperature environment. At the same time, reasonable tension control can further improve the strength and performance of the fiber rope.

[0050] 3) Metal film coating: using a high vacuum magnetron sputtering instrument of model ISC150T, a dense and evenly distributed metal film is magnetron sputtered on the surface of the intermediate aluminum silicate fiber rope obtained in step 2);

[0051] Among them, the parameters during magnetron sputtering are set as follows: the vacuum degree is 10 3 Pa to 10 5 Pa, the sputtering power is 25 w to 35 w, the sputtering time is 1 h to 1.5 h, and the deposition rate is 8 nm / min to 10 nm / min. The metal material of the metal film is pure chromium because pure chromium has good high-temperature resistance and corrosion resistance, and can form a stable oxide film in a high-temperature environment, further enhancing the inhibition effect on hot salt corrosion. At the same time, pure chromium has a good bonding force with the aluminosilicate fiber rope, which can ensure the stability and durability of the metal film on the surface of the fiber rope.

[0052] In order to further verify the efficacy of the present invention, the following tests were carried out:

[0053] Example 1

[0054] Prepare a chromium film aluminosilicate fiber rope and use it for TC25 titanium alloy bars. The specific process is as follows:

[0055] 1) First, weigh the materials with the composition of Al2O3:SiO2 and a mass ratio of 50%:48%. The remaining part is impurities and can be ignored. After mixing evenly, it is used as the aluminosilicate raw material; then it is heated to 1800 °C to form a molten material; then, by means of blowing, the speed during blowing is 5 nm / s, so that the molten material is rapidly drawn into aluminosilicate fibers under the action of the air flow;

[0056] 2) First, cool and twist the aluminosilicate fibers obtained in step 1). Among them, the temperature during the cooling treatment is controlled at 500 °C, and loose aluminosilicate fiber cotton is formed after cooling; during the twisting treatment, the twist is controlled at 90 T / m to form an aluminosilicate fiber bundle; then the twisted aluminosilicate fiber bundle is spirally braided to obtain an initial aluminosilicate fiber rope; then the initial aluminosilicate fiber rope is dried to obtain an intermediate aluminosilicate fiber rope. Among them, during the drying treatment, the temperature is set at 120 °C and the time is set at 3 h.

[0057] 3) Use a model ISC150T high-vacuum magnetron sputtering instrument to magnetron sputter a dense and evenly distributed chromium film on the surface of the intermediate aluminosilicate fiber rope obtained in step 2), and finally obtain a chromium film aluminosilicate fiber rope with a diameter of 3.5 mm. Among them, the parameters during magnetron sputtering are set as follows: the vacuum degree is 10 3 Pa to 10 5 Pa, the sputtering power is 30 w, the sputtering time is 1.2 h, and the deposition rate is 8 nm / min.

[0058] 4) Wind the 3.5 mm chromium-coated aluminosilicate fiber rope obtained in step 3) around the surface of a TC25 titanium alloy rod with a diameter of 200 mm to make a test sample. Among them, the titanium alloy rod needs to be solution-treated and aged, and its microstructure is a typical bimodal structure. Samples are taken at the R / 2 of the sample blank along the transverse direction, and Φ5.0 mm specimens are prepared by precision turning and external cylindrical grinding. The surface roughness Ra is about 0.3 μm. The specific temperature during solution treatment is 960 °C, the heating rate is 10 °C / min, and the holding time is 90 min; then artificial aging treatment is carried out, the temperature is 550 °C, and after holding for 6 hours, it is air-cooled to room temperature.

[0059] Comparative Example 1

[0060] The only difference between this Comparative Example 1 and Example 1 is that in this Comparative Example 1, the operation of step 3) is not carried out, that is, no chromium film is plated on the surface of the aluminosilicate fiber rope.

[0061] Furthermore, in order to evaluate the hot salt corrosion sensitivity of the titanium alloy, a uniaxial tensile creep test was adopted. Specifically, 2 groups of specimens were taken and the surfaces of the samples were wound with the aluminosilicate fiber rope of Comparative Example 1 and the chromium-coated aluminosilicate fiber rope of Example 1 respectively. The test was carried out on a SANS testing machine according to GB / T 2039-2012 "Test Method for Uniaxial Tensile Creep of Metallic Materials" for a creep test, and the test conditions were 500 °C and 637 MPa.

[0062] Among them, Figure 4 are SEM and EDS (energy spectrum analysis) photos of the specimens wound with the aluminosilicate fiber rope of Comparative Example 1 and the chromium-coated aluminosilicate fiber rope of Example 1 at the same position. It can be seen from Figure 4 that the elements Ti, Cr, Si, Sn, and Cl exist in the crack area of the specimen; further, it can be seen that the content of Cl element on the surface of the TC25 titanium alloy rod without deposited Cr in Comparative Example 1 is higher than that on the surface of the TC25 titanium alloy rod with deposited Cr element in Example 1. At the same time, the content of Ti element at the crack initiation site is relatively low. This is because the Cl element will corrode the surface of the TC25 titanium alloy rod, damage the oxide film on the rod surface, and then initiate initial cracking. In addition, complex chemical reactions will occur between the halide and the titanium alloy matrix. Under the conditions of 500 °C / 637 MPa, the Cl element in the aluminosilicate fiber rope wound on the surface of the TC25 titanium alloy in Comparative Example 1 will react with the alloy in a series of chemical reactions, damage its surface oxide layer, promote the diffusion of O element into the matrix, and be accompanied by the formation of corrosion oxides, ultimately resulting in cracks on the surface of the TC25 titanium alloy rod.

[0063] Figure 5 are the longitudinal section microstructures of the TC25 titanium alloy specimens at low magnification and high magnification, and their phase components include primary α phase, secondary α phase, and β phase. From Figure 5As can be seen from (a-c) of Fig. 1, there are cracks longitudinally in the uncoated Cr aluminosilicate fiber rope sample of Comparative Example 1. The crack propagation form is intergranular crack, which propagates along the edge of the initial α grain boundary. That is, the surface corrosion phenomenon of the uncoated Cr aluminosilicate fiber rope sample in Comparative Example 1 is serious, resulting in the appearance of cracks. And from Figure 5 (d-f), it can be seen that the surface of the aluminosilicate fiber rope sample coated with Cr in Example 1 is relatively intact. Thus, it can be known that the aluminosilicate fiber rope with Cr deposited on the surface can effectively inhibit the corrosion phenomenon on the surface of the titanium alloy, thereby effectively protecting the TC25 titanium alloy.

[0064] Another 2 groups of samples were taken, and the surfaces of the samples were wound with the aluminosilicate fiber rope of Comparative Example 1 and the aluminosilicate fiber rope with Cr film of Example 1 respectively. The creep rupture test was carried out on a SANS tester according to GB / T 2039-2012 "Test Method for Uniaxial Tensile Creep of Metallic Materials". The test conditions were 500 °C and 637 MPa until the sample ruptured permanently. The results are shown in Table 1 below:

[0065] Table 1 Creep rupture life of samples wound with aluminosilicate fiber rope and aluminosilicate fiber rope with Cr film

[0066]

[0067] As can be seen from the experimental results in Table 1, the creep rupture time of the samples wound with the aluminosilicate fiber rope with Cr film in Example 1 is greater than 180 h, which is much higher than that of the uncoated Cr aluminosilicate fiber rope samples in Comparative Example 1, thus helping to greatly improve the creep rupture life and creep rupture test accuracy of the titanium alloy under high-temperature stress and chloride salt pollution environment.

[0068] Example 2

[0069] Prepare an aluminosilicate fiber rope with Cr film and use it for TA15 titanium alloy bars. The specific process is as follows:

[0070] 1) First, weigh the materials with the composition of Al2O3:SiO2 and the mass ratio of 50.5%:48.3%. The remaining part is impurities and can be ignored. After mixing evenly, it is used as the aluminosilicate raw material; then it is heated to 1500 °C to form a molten material of the aluminosilicate raw material; then, by means of centrifugal spinning, the rotation speed during centrifugal spinning is 1000 r / min, so that the molten material is rapidly drawn into aluminosilicate fibers under the action of air flow;

[0071] 2) First, cool and twist the aluminosilicate fiber obtained in step 1). During the cooling process, the temperature is controlled at 400 °C, and after cooling, loose aluminosilicate fiber cotton is formed. During the twisting process, the twist is controlled at 150 T / m to form an aluminosilicate fiber bundle. Then, helically braid the twisted aluminosilicate fiber bundle to obtain an initial aluminosilicate fiber rope. Subsequently, perform heat setting on the initial aluminosilicate fiber rope to obtain an intermediate aluminosilicate fiber rope. During the heat setting process, the temperature is set at 480 °C and the tension is set at 3 MPa.

[0072] 3) Using a high-vacuum magnetron sputtering instrument with the model ISC150T, magnetron sputter a dense and evenly distributed chromium film on the surface of the intermediate aluminosilicate fiber rope obtained in step 2) to finally obtain a chromium film aluminosilicate fiber rope with a diameter of 4 mm. During magnetron sputtering, the parameters are set as follows: the vacuum degree is 10 3 Pa to 10 5 Pa, the sputtering power is 25 w, the sputtering time is 1.5 h, and the deposition rate is 10 nm / min.

[0073] 4) Wind the 4 mm chromium film aluminosilicate fiber rope obtained in step 3) on the surface of a TA15 titanium alloy rod with a diameter of 300 mm to make a test sample. The titanium alloy rod needs to be heat-treated at 850 °C for 2.5 h, and its microstructure is a typical bimodal structure. Then, take samples at the R / 2 position of the sample blank along the transverse direction, and prepare specimens with a diameter of Φ5.0 mm through precision turning and external cylindrical grinding. The surface roughness Ra is about 0.3 μm. The temperature during heat treatment is 850 °C, the heating rate is 10 °C / min, the holding time is 150 min, and after holding, it is air-cooled to room temperature.

[0074] Comparative Example 2

[0075] The difference between this Comparative Example 2 and Example 2 is only that in this Comparative Example 2, the operation in step 3) is not carried out, that is, no chromium film is plated on the surface of the aluminosilicate fiber rope.

[0076] Furthermore, take 2 groups of specimens, and wind the sample surface with the aluminosilicate fiber rope of Comparative Example 2 and the chromium film aluminosilicate fiber rope of Example 2 respectively. The endurance test is carried out on a Sansi Taijie testing machine according to GB / T 2039-2012 "Test Method for Uniaxial Tensile Creep of Metallic Materials". The test conditions are 500 °C and 470 MPa until the specimen endures fracture. The results are shown in Table 2 below:

[0077] Table 2 Endurance life of specimens wound with aluminosilicate fiber rope and chromium film aluminosilicate fiber rope

[0078]

[0079] From the experimental results in Table 2, it can be seen that the persistent fracture times of the specimens of the aluminosilicate fiber rope wound with chromium film in Example 2 are all greater than 50 h, which is much higher than the persistent fracture time of the aluminosilicate fiber rope specimen without Cr deposition in Comparative Example 1. This helps to significantly improve the persistent life and persistent detection accuracy of titanium alloys under high-temperature stress and chloride salt-polluted environments.

[0080] Example 3

[0081] Prepare an aluminosilicate fiber rope with a chromium film and use it for TA12A titanium alloy bars. The specific process is as follows:

[0082] 1) First, weigh the materials with the composition of Al2O3:SiO2 and a mass ratio of 49.5%:49%. The remaining part is impurities and can be ignored. After mixing evenly, it is used as the aluminosilicate raw material. Then, heat it to 1900 °C to form a molten material of the aluminosilicate raw material. Then, by means of blowing, with a speed of 7 nm / s during blowing, the molten material is rapidly drawn into aluminosilicate fibers under the action of the air flow;

[0083] 2) First, cool and twist the aluminosilicate fibers obtained in step 1). Among them, the temperature during the cooling treatment is controlled at 600 °C, and loose aluminosilicate fiber cotton is formed after cooling; during the twisting treatment, the twist is controlled at 50 T / m to form an aluminosilicate fiber bundle; then, the twisted aluminosilicate fiber bundle is helically braided to obtain an initial aluminosilicate fiber rope; then, the initial aluminosilicate fiber rope is dried to obtain an intermediate aluminosilicate fiber rope. Among them, during the drying treatment, the temperature is set at 100 °C and the time is set at 6 h;

[0084] 3) Use a high-vacuum magnetron sputtering instrument of model ISC150T to magnetron sputter a dense and evenly distributed chromium film on the surface of the intermediate aluminosilicate fiber rope obtained in step 2) to finally obtain a chromium film aluminosilicate fiber rope with a diameter of 3 mm. Among them, the parameters during magnetron sputtering are set as follows: the vacuum degree is 10 3 Pa to 10 5 Pa, the sputtering power is 35 w, the sputtering time is 1 h, and the deposition rate is 9 nm / min.

[0085] 4) Wind the 3-mm chromium film aluminosilicate fiber rope obtained in step 3) on the surface of a TA12A titanium alloy bar with a diameter of 200 mm to make a test sample. Among them, the titanium alloy bar needs to be solution-treated and aged. The microstructure is a typical duplex structure. Samples are taken at the R / 2 of the sample blank along the transverse direction, and specimens with a diameter of Φ5.0 mm are prepared by precision turning and external cylindrical grinding. The surface roughness Ra is about 0.3 μm. The specific temperature during the solution treatment is 960 °C, the heating rate is 10 °C / min, and the holding time is 90 min; then, artificial aging treatment is carried out at a temperature of 550 °C. After holding for 6 hours, it is air-cooled to room temperature.

[0086] Comparative Example 3

[0087] The difference between Comparative Example 3 and Example 3 is only that in Comparative Example 1, operation in step 3) was not performed, that is, a chromium film was not plated on the surface of the aluminosilicate fiber rope.

[0088] Further, 2 groups of specimens were taken, and the surfaces of the samples were wound with the aluminosilicate fiber rope of Comparative Example 3 and the chromium film aluminosilicate fiber rope of Example 3, respectively. The creep rupture test was carried out on a Sansi Taijie testing machine according to GB / T 2039-2012 "Test Method for Uniaxial Tensile Creep of Metallic Materials". The test conditions were 550 °C and 430 MPa until the specimens ruptured permanently. The results are shown in Table 1 below:

[0089] Table 3 Creep rupture life of specimens wound with aluminosilicate fiber rope and chromium film aluminosilicate fiber rope

[0090]

[0091] It can be seen from the experimental results in Table 3 that the creep rupture time of the specimens wound with the chromium film aluminosilicate fiber rope in Example 3 was greater than 190 h, which was much higher than the creep rupture time of the specimens of the aluminosilicate fiber rope without Cr deposition in Comparative Example 3. Thus, it helps to greatly improve the creep rupture life and the accuracy of creep rupture detection of titanium alloy under high-temperature stress and chloride salt pollution environment.

[0092] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0093] It should be understood that the present invention is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A method for preparing an aluminum silicate fiber rope for inhibiting hot salt corrosion, characterized in that: The preparation method comprises the following steps: Step 1: Raw material processing and fiber preparation First, aluminum silicate raw materials are prepared in a specific ratio, and then the prepared raw materials are melted at high temperature. Then, the molten materials are drawn into aluminum silicate fibers under the action of corresponding airflow or centrifugal force by blowing or centrifugal spinning. Step 2: Initial processing of fiber rope Firstly, the aluminum silicate fibers obtained in step 1 are cooled and twisted to form an aluminum silicate fiber bundle, and then the aluminum silicate fiber bundle is spirally braided to obtain an initial aluminum silicate fiber rope, and then the initial aluminum silicate fiber rope is dried or heat-set to obtain an intermediate aluminum silicate fiber rope; Step 3: Metallization Using a magnetron sputtering coating apparatus, a dense and evenly distributed metal film is magnetron sputtered on the surface of the intermediate aluminum silicate fiber rope obtained in step 2.

2. The preparation method according to claim 1, characterized in that: In step 1, the atomic ratio of aluminum, silicon and oxygen in the aluminum silicate raw material is (1.1-1.3): (0.9-1.1): (5.3-5.9).

3. The preparation method according to claim 1, characterized in that: In step 1, the temperature of the high temperature melting is 1500°C to 1900°C.

4. The preparation method according to claim 1, characterized in that: In step 1, the sputtering speed during the spraying is 1 nm / s to 10 nm / s; The rotation speed during the centrifugal spinning is 500r / min to 2000r / min.

5. The preparation method according to claim 1, characterized in that: In step 2, when the aluminum silicate fiber is cooled, the temperature is 400° C. to 600° C.; when twisted, the twist is 50 T / m to 150 T / m.

6. The preparation method according to claim 1, characterized in that: In step 2, when the initial aluminum silicate fiber rope is dried, the temperature is set to 100° C. to 200° C. and the time is set to 2 h to 6 h; When the initial aluminum silicate fiber rope is subjected to heat setting treatment, the temperature is set to 300° C. to 600° C., and the tension is set to 1 MPa to 5 MPa.

7. The preparation method according to claim 1, characterized in that: In step 3, the model of the magnetron sputtering coating instrument is ISC150T high vacuum magnetron sputtering instrument, and the parameters of magnetron sputtering are set as follows: vacuum degree is 10 3 Pa~10 5 Pa, the sputtering power is 25w~35w, the sputtering time is 1h~1.5h, and the deposition rate is 8nm / min~10nm / min.

8. The preparation method according to claim 1, characterized in that: In step 3, the metal material of the metal film is pure chromium.

9. An aluminum silicate fiber rope for inhibiting hot salt corrosion, characterized in that: The aluminum silicate fiber rope is prepared based on the preparation method according to any one of claims 1 to 8, and the diameter of the aluminum silicate fiber rope is 3 mm to 4 mm.

10. An application of the aluminum silicate fiber rope as claimed in claim 9, characterized in that: The aluminum silicate fiber rope is used for titanium alloy protection.

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