Method for testing thermal damage of alumina fiber rope containing amorphous silicon
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SOUTHWEST TECHNICAL ENGINEERING RESEARCH INSTITUTE OF CHINA SOUTH IND GROUP
- Filing Date
- 2026-05-29
- Publication Date
- 2026-08-07
AI Technical Summary
在实际服役中，纤维绳经历反复加热、冷却循环，会发生晶粒长大、非晶硅晶化、界面脱粘、体积收缩等热损伤，导致力学性能衰减、结构劣化
[0042] Based on measured data from 0-15 thermal cycles, this invention establishes a cubic polynomial model for tensile strength and a linear model for grain growth, and constructs a multi-factor coupled thermal damage index (DI) to achieve quantitative characterization of the degree of thermal damage. It can accurately predict the degree of thermal damage, determine the failure threshold, and assess the service life, ensuring the reliability of fiber ropes in high-temperature cyclic conditions.
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Figure CN122524876A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of performance characterization and life assessment technology of high-temperature thermal insulation fiber materials, specifically a method for testing the thermal damage of alumina fiber ropes containing amorphous silicon. Background Technology
[0002] Alumina fiber ropes possess excellent properties such as high temperature resistance, corrosion resistance, low thermal conductivity, and high tensile strength, and are widely used in sealing, heat insulation, and bonding of high-temperature equipment in aerospace, metallurgy, chemical, and power industries. However, in actual service, the fiber ropes undergo repeated heating and cooling cycles, resulting in thermal damage such as grain growth, amorphous silicon crystallization, interface debonding, and volume shrinkage, leading to a decline in mechanical properties and structural deterioration.
[0003] Currently, existing technologies lack multi-parameter coupled thermal damage models for alumina fiber ropes containing amorphous silicon. They cannot simultaneously correlate tensile strength, diameter, grain size, and number of thermal cycles, making it difficult to achieve accurate damage assessment and lifetime prediction, thus limiting the reliable application of this material under harsh high-temperature conditions. Summary of the Invention
[0004] This invention provides a method for testing the thermal damage of alumina fiber ropes containing amorphous silicon. Based on measured thermal cycling data, a cubic polynomial model of tensile strength and a linear model of grain growth are established, and a multi-factor coupled thermal damage index (DI) is constructed to achieve quantitative characterization of the degree of thermal damage. This method can accurately predict the degree of thermal damage, determine the failure threshold, and assess the service life. It solves the problem mentioned in the background art that the prior art lacks a multi-parameter coupled thermal damage model for alumina fiber ropes, making it difficult to achieve accurate damage assessment and service life prediction.
[0005] This invention provides the following technical solution:
[0006] A method for testing thermal damage to alumina fiber rope containing amorphous silicon includes the following steps:
[0007] S1. Conduct a thermal cycling test on the alumina fiber rope;
[0008] S2, Multi-cycle Looping and Data Acquisition:
[0009] S3, Single-factor evolutionary modeling:
[0010] S4. Constructing the multi-factor coupled thermal damage index DI:
[0011] S5. Output thermal damage assessment results according to the preset judgment criteria.
[0012] As a preferred embodiment of the present invention, the thermal cycling test on the alumina fiber rope specifically includes:
[0013] S101. Place the alumina fiber rope containing amorphous silicon into the heating furnace chamber, introduce the mixed gas and adjust the flow rate to 0.5L / min;
[0014] S102. Start the heating program of the heating furnace and raise the temperature inside the furnace to 1100℃ at a constant heating rate of 5℃ / s.
[0015] S103, keep warm at 1100℃ for 30 minutes;
[0016] S104. After the heat preservation is completed, stop heating and allow the alumina fiber rope to cool to room temperature with the furnace, completing one heat cycle.
[0017] As a preferred embodiment of the present invention, the mixed gas includes either an inert gas or air.
[0018] As a preferred embodiment of the present invention, the multi-cycle loop and data acquisition specifically include:
[0019] S201. Obtain the initial data parameters of the amorphous silicon alumina fiber rope to be tested;
[0020] S201. Repeat S101-S104 to conduct 1-15 thermal cycling tests on the alumina fiber rope, and collect the data parameters of the alumina fiber rope after each test.
[0021] The data parameters include tensile strength, diameter, loss on ignition, and grain size.
[0022] The single-factor evolutionary modeling specifically includes:
[0023] As a preferred technical solution of the present invention, mathematical models for tensile strength and grain size as a function of the number of thermal cycles are established respectively.
[0024] The tensile strength is modeled using a cubic polynomial, while the grain size is modeled using a linear model, as follows.
[0025] As a preferred embodiment of the present invention, the cubic polynomial model of tensile strength is as follows:
[0026] S(X) = -0.0207X 3 +0.4634X 2 -2.1X+17.2565
[0027] In the formula: S is the tensile strength, X is the number of thermal cycles, and 0≤X≤15.
[0028] As a preferred embodiment of the present invention, the linear model for grain size is as follows:
[0029] D(t) = 0.1047t + 6.6795
[0030] In the formula: D is the average grain size, t is the number of thermal cycles, 0≤t≤15.
[0031] As a preferred embodiment of the present invention, the construction of the multi-factor coupled thermal damage index DI specifically includes:
[0032] After normalizing tensile strength, diameter, and grain size, a weighted coupling was performed to construct a comprehensive thermal damage index (DI).
[0033] The formula for calculating the comprehensive thermal damage index DI is as follows:
[0034] DI=0.4(1-S / S0)+0.3(1-φ / φ0)+0.3(d / d0-1)
[0035] In the formula, DI is the thermal damage index, with a value ranging from 0 to 1; S is the current tensile strength, and S0 is the initial tensile strength; φ is the current diameter, and φ0 is the initial diameter; d is the current grain size, and d0 is the initial grain size.
[0036] As a preferred embodiment of the present invention, the step of outputting thermal damage assessment results according to preset judgment criteria specifically includes:
[0037] Based on the threshold range of the DI value, the degree of thermal damage is determined and the remaining service life is predicted.
[0038] When DI < 0.3, it is considered minor damage and continued use is permitted.
[0039] When 0.3 ≤ DI < 0.6, it is judged as moderate damage, and monitoring should be intensified;
[0040] When DI≥0.6, it is judged as severely damaged or failed, and should be replaced immediately.
[0041] Compared with the prior art, the present invention provides a method for testing the thermal damage of alumina fiber rope containing amorphous silicon, which has the following advantages:
[0042] Based on measured data from 0-15 thermal cycles, this invention establishes a cubic polynomial model for tensile strength and a linear model for grain growth, and constructs a multi-factor coupled thermal damage index (DI) to achieve quantitative characterization of the degree of thermal damage. It can accurately predict the degree of thermal damage, determine the failure threshold, and assess the service life, ensuring the reliability of fiber ropes in high-temperature cyclic conditions. Attached Figure Description
[0043] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.
[0044] Figure 1 This is a flowchart of the damage testing method of the present invention;
[0045] Figure 2 The thermal damage characteristic curves of amorphous silicon alumina fiber rope are shown. Detailed Implementation
[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.
[0047] Example:
[0048] Reference Figures 1-2 A method for testing the thermal damage of alumina fiber rope containing amorphous silicon includes the following steps:
[0049] S1. Conduct a thermal cycling test on the alumina fiber rope;
[0050] S2, Multi-cycle Looping and Data Acquisition:
[0051] S3, Single-factor evolutionary modeling:
[0052] S4. Constructing the multi-factor coupled thermal damage index DI:
[0053] S5. Output thermal damage assessment results according to the preset judgment criteria.
[0054] Thermal cycling tests were conducted on alumina fiber ropes, specifically including:
[0055] S101. Place the alumina fiber rope containing amorphous silicon into the heating furnace chamber, introduce the mixed gas and adjust the flow rate to 0.5L / min;
[0056] S102. Start the heating program of the heating furnace and raise the temperature inside the furnace to 1100℃ at a constant heating rate of 5℃ / s.
[0057] S103, keep warm at 1100℃ for 30 minutes;
[0058] S104. After the heat preservation is completed, stop heating and allow the alumina fiber rope to cool to room temperature with the furnace, completing one heat cycle.
[0059] The mixed gas includes one of an inert gas and air; in this embodiment, air is selected.
[0060] Multi-cycle looping and data acquisition, specifically including:
[0061] S201. Obtain the initial data parameters of the amorphous silicon alumina fiber rope to be tested;
[0062] S201. Repeat S101-S104 to conduct 1-15 thermal cycling tests on the alumina fiber rope, and collect the data parameters of the alumina fiber rope after each test.
[0063] The data parameters include tensile strength, diameter, loss on ignition, and grain size.
[0064] Single-factor evolutionary modeling specifically includes:
[0065] Mathematical models for tensile strength and grain size as a function of the number of thermal cycles were established.
[0066] The tensile strength is modeled using a cubic polynomial, while the grain size is modeled using a linear model, as follows.
[0067] The cubic polynomial model for tensile strength is as follows:
[0068] S(X) = -0.0207X 3 +0.4634X 2 -2.1X+17.2565
[0069] In the formula: S is the tensile strength, X is the number of thermal cycles, and 0≤X≤15.
[0070] The linear model for grain size is as follows:
[0071] D(t) = 0.1047t + 6.6795
[0072] In the formula: D is the average grain size, t is the number of thermal cycles, 0≤t≤15.
[0073] Constructing a multi-factor coupled thermal damage index (DI), specifically including:
[0074] After normalizing tensile strength, diameter, and grain size, a weighted coupling was performed to construct a comprehensive thermal damage index (DI).
[0075] The formula for calculating the comprehensive thermal damage index DI is as follows:
[0076] DI=0.4(1-S / S0)+0.3(1-φ / φ0)+0.3(d / d0-1)
[0077] In the formula, DI is the thermal damage index, ranging from 0 to 1; S is the current tensile strength, and S0 is the initial tensile strength; φ is the current diameter, and φ0 is the initial diameter; d is the current grain size, and d0 is the initial grain size.
[0078] Wherein, S0 = 20.46 MPa, φ0 = 5.00 mm, d0 = 6.23 nm,
[0079] The thermal damage assessment results are output based on the preset judgment criteria, specifically including:
[0080] Based on the threshold range of the DI value, the degree of thermal damage is determined and the remaining service life is predicted.
[0081] When DI < 0.3, it is considered minor damage and continued use is permitted.
[0082] When 0.3 ≤ DI < 0.6, it is judged as moderate damage, and monitoring should be intensified;
[0083] When DI≥0.6, it is judged as severely damaged or failed, and should be replaced immediately.
[0084] Table 1: Measured tensile strength results after different thermal cycling cycles
[0085]
[0086] Table 2: Measured results of grain size after different thermal cycles
[0087]
[0088] Table 3: Measured results of the limiting rope after different thermal cycles
[0089]
[0090] As shown in Table 3, during 0-15 thermal cycles, the diameter of the alumina fiber rope fluctuated slightly between 4.70-4.85 mm, remained stable overall, and the thermal shrinkage rate was ≤6%.
[0091] Table 4: Measured results of the burning loss of the limiting rope after different thermal cycles
[0092]
[0093] Table 5: Elemental composition after 5 cycles
[0094]
[0095] As shown in Table 5, after five thermal cycles, the main elements of the alumina fiber rope are O (55.94%) and Al (44.06%), with no obvious impurity enrichment.
[0096] In addition, combining Tables 1-5, the cubic polynomial model of tensile strength, the linear model of grain size, and... Figure 2 As shown, the following physical mechanism of the model is obtained:
[0097] 1-3 cycles: amorphous silicon oxidation, organic phase burn-off, defect activation, and a sharp drop in tensile strength;
[0098] 5-11 cycles: Grain growth is moderate, structure rearrangement occurs, and tensile strength recovers;
[0099] 11-15 cycles: Grain boundaries stabilize, composition becomes homogeneous, tensile strength exceeds initial value, and the system enters a stable plateau period.
[0100] Simulation Example 1: Based on Tables 1, 2, and 3, the initial alumina fiber rope sample was subjected to 11 thermal cycles, and the following data were obtained:
[0101] Based on the cubic polynomial model of tensile strength, the model predicted a tensile strength of 22.68 MPa after 11 thermal cycles. The current tensile strength is 21.83 MPa, with a prediction error of 3.9%.
[0102] Based on the linear model of grain size, the model predicted a grain size of 7.83 nm after 11 thermal cycles, while the current grain size is 9.03 nm, resulting in a prediction error of 12.8%.
[0103] In addition, after 11 thermal cycles, the current diameter of the limiting rope is 4.74 mm, while the initial diameter of the limiting rope is 5.00 mm.
[0104] Substituting the above data into the formula for calculating the comprehensive thermal damage index (DI), we find that DI = 0.12 (minor damage) after 11 thermal cycles.
[0105] Simulation Example 2: Referring to Tables 1 and 2, the initial alumina fiber rope sample was subjected to 15 thermal cycles, and the following data was obtained:
[0106] Based on the cubic polynomial model of tensile strength, the model predicted a tensile strength of 20.16 MPa after 15 thermal cycles. The current tensile strength is 20.87 MPa, with a prediction error of 3.4%.
[0107] Based on the linear model of grain size, the model predicted a grain size of 7.67 nm after 15 thermal cycles, while the current grain size is 8.25 nm, resulting in a prediction error of 7%.
[0108] In addition, after 15 heat cycles, the current diameter of the limiting rope is 4.80 mm, while the initial diameter of the limiting rope is 5.00 mm.
[0109] Substituting the above data into the formula for calculating the comprehensive thermal damage index (DI), we find that DI = 0.10 (minor damage) after 11 thermal cycles.
[0110] Combining the data from Simulation Example 1 and Simulation Example 2, it can be seen that the error between the model prediction and the measured value remains at a low level (≤20%), indicating that the model has good fitting ability and prediction reliability. The cubic polynomial model of tensile strength and the linear model of grain size can reflect the performance change law of the material in the thermal cycling process well. Combined with the comprehensive thermal damage index, the degree of thermal damage can be predicted more accurately, the failure threshold can be determined, and the service life can be evaluated, ensuring the reliability of fiber rope in high-temperature cycling conditions.
[0111] Based on measured data from 0-15 thermal cycles, this invention establishes a cubic polynomial model for tensile strength and a linear model for grain growth, and constructs a multi-factor coupled thermal damage index (DI) to achieve quantitative characterization of the degree of thermal damage. The model reveals that tensile strength drops sharply after 1-3 cycles, gradually recovers after 5-11 cycles, and stabilizes after 11-15 cycles; grains grow overall with each cycle; diameter fluctuations are small, and thermal stability is good.
[0112] Components not described in detail in this article are existing technologies.
[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for testing the thermal damage of alumina fiber rope containing amorphous silicon, characterized in that, Includes the following steps: S1. Conduct a thermal cycling test on the alumina fiber rope; S2, Multi-cycle Looping and Data Acquisition: S3, Single-factor evolutionary modeling: S4. Constructing the multi-factor coupled thermal damage index DI: S5. Output thermal damage assessment results according to the preset judgment criteria.
2. The method for testing thermal damage of alumina fiber rope containing amorphous silicon according to claim 1, characterized in that, The thermal cycling test on the alumina fiber rope specifically includes: S101. Place the alumina fiber rope containing amorphous silicon into the heating furnace chamber, introduce the mixed gas and adjust the flow rate to 0.5L / min; S102. Start the heating program of the heating furnace and raise the temperature inside the furnace to 1100℃ at a constant heating rate of 5℃ / s. S103, keep warm at 1100℃ for 30 minutes; S104. After the heat preservation is completed, stop heating and allow the alumina fiber rope to cool to room temperature with the furnace, completing one heat cycle.
3. The method for testing thermal damage of alumina fiber rope containing amorphous silicon according to claim 2, characterized in that, The mixed gas includes one of the following: an inert gas and air.
4. The method for testing thermal damage of alumina fiber rope containing amorphous silicon according to claim 2, characterized in that, The multi-cycle loop and data acquisition specifically include: S201. Obtain the initial data parameters of the amorphous silicon alumina fiber rope to be tested; S201. Repeat S101-S104 to conduct 1-15 thermal cycling tests on the alumina fiber rope, and collect the data parameters of the alumina fiber rope after each test. The data parameters include tensile strength, diameter, loss on ignition, and grain size.
5. The method for testing thermal damage of alumina fiber rope containing amorphous silicon according to claim 1, characterized in that, The single-factor evolutionary modeling specifically includes: Mathematical models for tensile strength and grain size as a function of the number of thermal cycles were established. The tensile strength is modeled using a cubic polynomial, while the grain size is modeled using a linear model, as follows.
6. The method for testing thermal damage of alumina fiber rope containing amorphous silicon according to claim 5, characterized in that, The cubic polynomial model for tensile strength is as follows: S(X)=-0.0207X 3 +0.4634X 2 -2.1X+17.2565 In the formula: S is the tensile strength, X is the number of thermal cycles, and 0≤X≤15.
7. The method for testing thermal damage of alumina fiber rope containing amorphous silicon according to claim 5, characterized in that, The linear model for grain size is as follows: D(t) = 0.1047t + 6.6795 In the formula: D is the average grain size, t is the number of thermal cycles, 0≤t≤15.
8. The method for testing thermal damage of alumina fiber rope containing amorphous silicon according to claim 1, characterized in that, The construction of the multi-factor coupled thermal damage index DI specifically includes: After normalizing tensile strength, diameter, and grain size, a weighted coupling was performed to construct a comprehensive thermal damage index (DI). The formula for calculating the comprehensive thermal damage index DI is as follows: DI=0.4(1-S / S0)+0.3(1-φ / φ0)+0.3(d / d0-1) In the formula, DI is the thermal damage index, with a value ranging from 0 to 1; S is the current tensile strength, and S0 is the initial tensile strength; φ is the current diameter, and φ0 is the initial diameter; d is the current grain size, and d0 is the initial grain size.
9. The method for testing thermal damage of alumina fiber rope containing amorphous silicon according to claim 1, characterized in that, The output of thermal damage assessment results based on preset judgment criteria specifically includes: Based on the threshold range of the DI value, the degree of thermal damage is determined and the remaining service life is predicted. When DI < 0.3, it is considered minor damage and continued use is permitted. When 0.3 ≤ DI < 0.6, it is judged as moderate damage, and monitoring should be intensified; When DI≥0.6, it is judged as severely damaged or failed, and should be replaced immediately.