High-strength metal-SiCf / SiC heterogeneous cladding tube structure and design method thereof

Abstract

The invention discloses a high-strength metal-SiCf / SiC heterogeneous cladding tube structure and a design method thereof. The heterogeneous cladding tube comprises a refractory metal lining and a plurality of layers of SiC fiber preforms with the weaving angle of 0-45 degrees. The design method comprises the following steps: A, establishing a geometric model of the multi-layer heterogeneous cladding tube; b, performing entity grid division on the geometric model of the multi-layer heterogeneous cladding tube; c, establishing a curve coordinate system; d, setting boundary conditions of the geometric model of the multilayer heterogeneous cladding tube; e, defining a mechanical damage criterion of each constituent part of the geometric model of the multilayer heterogeneous cladding tube; f, calculating a stress-strain curve of the multi-layer heterogeneous cladding tube; and G, the structural design of the high-strength multi-layer heterogeneous cladding pipe is determined. The multi-layer heterogeneous cladding tube designed by the invention has excellent axial tensile strength and circumferential tensile strength, and meanwhile, a finite element method is adopted for structural design to reduce the time period of materials from design to application, so that rapid optimization of an accident fault-tolerant fuel cladding structure is realized.

Description

Technical Field

[0001] The present invention relates to the field of nuclear fuel composite cladding tubes, and specifically provides a high-strength metal-SiC f / SiC heterogeneous cladding tube structure and its design method. Background Art

[0002] The nuclear fuel core of accident-tolerant fuel cladding material (ATFM) has strong radioactivity. The main function of the cladding tube covering the nuclear fuel core is to protect the nuclear fuel from coolant corrosion and prevent the escape of radioactive nuclear fission products. The harsh working environment makes the cladding tube subject to the dual pressure of internal nuclear fission gas products and external coolant, as well as strong irradiation, corrosion, thermal shock and other effects. Therefore, the nuclear cladding material is required to have a small neutron absorption cross section, high mechanical stability, dimensional stability under irradiation, reaction inertness with fission products, water corrosion resistance, and low creep rate. The selection, design and reliability of its materials are of great significance to the advancement, economy and safety of the nuclear power field.

[0003] SiC f / SiC composite materials have excellent high temperature mechanical properties, corrosion resistance and radiation resistance, and can be used in light water reactors. Due to the limitations of the current preparation process, SiC f / SiC composite materials still have a large porosity (10% to 15%), which limits their further development in the field of nuclear energy. Refractory metal materials, whose density can reach 100%, especially molybdenum metal shows the same f / SiC composite materials have good high temperature chemical compatibility and physical matching, so metal-SiC f / SiC heterogeneous cladding tubes have become one of the candidate materials for the new generation of accident-tolerant fuel cladding, but there is currently little research on their mechanical properties, especially how the structural design of heterogeneous cladding tubes affects their axial tensile strength and circumferential tensile strength, which remains an issue to be resolved.

[0004] Therefore, the present invention aims to provide a high-strength metal-SiC f / SiC heterogeneous cladding tube structure and design method thereof, the designed heterogeneous cladding tube is composed of an inner layer of refractory metal and an outer layer of SiC f / SiC composite material, the thickness of the inner layer of refractory metal is 0.3-0.5mm, the outer layer of SiC f / SiC composite material is composed of 3 to 5 layers of SiC fiber preforms, each layer of SiC fiber preform has a weaving angle of 0° to 45° and a thickness of 0.3mm. The axial tensile strength of the heterogeneous cladding tube with this structure can reach 225MPa, and the circumferential tensile strength is 183MPa to 190MPa, indicating good axial tensile strength and circumferential tensile strength. In addition, the stress-strain curves of heterogeneous cladding tubes with different two-dimensional fiber weaving angles were calculated by finite element simulation, and the axial tensile strength and circumferential tensile strength of different heterogeneous cladding tubes were analyzed and compared, thereby selecting a heterogeneous cladding tube structure design with high strength. The finite element method was used to simulate the metal-SiC f Structural design of / SiC heterogeneous cladding tubes can reduce the cost of material development and testing, and provide a practical and effective method for the design of new accident-tolerant fuel cladding. Summary of the invention

[0005] The object of the present invention is to provide a high strength metal-SiC f / SiC heterogeneous cladding tube structure and design method thereof are intended to improve metal-SiC f / SiC heterogeneous cladding tube axial tensile strength and hoop tensile strength, shortening the metal-SiC f / SiC heterogeneous cladding tube design time.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A high-strength metal-SiC f / SiC heterogeneous cladding tube structure, including inner metal lining and outer SiC f / SiC composite material, the inner metal lining is refractory metal, the outer SiC f / SiC composite material is composed of 3 to 5 layers of SiC fiber preforms with the same braiding angle. f and coated SiC fiber preform SiC f The SiC matrix is ​​composed of a preform, and the SiC fibers in each layer of the preform are in a two-dimensional woven manner, and the woven angle is in the range of 0° to 45°, and the woven angle is the angle between the axis of the SiC fiber and the axis of the heterogeneous cladding tube.

[0008] Furthermore, the refractory metal is one of rhenium, zirconium, molybdenum, tantalum and niobium.

[0009] Furthermore, the thickness of the refractory metal is 0.3 mm to 0.4 mm, and SiC fThe thickness of the / SiC composite material is 0.9mm-1.5mm, the volume fraction of SiC fiber is not less than 30%, the inner diameter of the heterogeneous cladding tube is 10.0mm-11.0mm, the axial tensile strength of the heterogeneous cladding tube is not less than 200MPa, and the circumferential tensile strength is 183MPa-190MPa.

[0010] The present invention also provides a high-strength metal-SiC f The design method of the SiC heterogeneous cladding tube structure includes the following steps:

[0011] A. Establishing a geometric model of a multi-layer heterogeneous cladding tube: Based on the images obtained by scanning electron microscopy, the geometric size information of SiC fiber, SiC matrix, and metal lining was recorded, and three groups of single-layer preform models with different braiding angles were constructed in COMSOL Multiphysics software. The braiding angle of each group of single-layer preform models was 0° to 45°. The overlaps and gaps in the single-layer preform models were removed by modifying the relative tolerance value of the single-layer preform models, and then the single-layer preform models were combined into a geometric model of a multi-layer heterogeneous cladding tube;

[0012] B. Performing entity meshing on the geometric model of the multilayer heterogeneous cladding tube: Based on the geometric model of the multilayer heterogeneous cladding tube established in step a, tetrahedral meshing is performed on each component of the model, namely, SiC matrix, SiC fiber, and metal liner;

[0013] C. Establishing a curvilinear coordinate system: defining the three basis vectors of SiC fiber by solving the Laplace equation, defining the three basis vectors of SiC matrix and metal liner by vector operation, and completing the establishment of the curvilinear coordinate system of SiC matrix, SiC fiber and metal liner;

[0014] D. Setting boundary conditions of the multi-layer heterogeneous cladding tube geometric model: setting an incremental displacement series on the specified surface of the multi-layer heterogeneous cladding tube geometric model to simulate the process of the heterogeneous cladding tube being subjected to axial tension and radial compression;

[0015] E. Define the mechanical damage criteria of each component of the multi-layer heterogeneous cladding tube geometric model: SiC fiber adopts the Hashin criterion, SiC matrix adopts the first strength theory criterion, and metal lining adopts the fourth strength theory criterion, completing the establishment of the finite element model of the multi-layer heterogeneous cladding tube;

[0016] F. Calculate the stress-strain curve of the multi-layer heterogeneous cladding tube: Based on the finite element model of the multi-layer heterogeneous cladding tube established in step e, select the Newton iteration method to solve the stress-strain curve of the heterogeneous cladding tube, and complete the drawing of the axial stress-strain curve and the hoop stress-strain curve of the heterogeneous cladding tube;

[0017] G. Determine the structural design of a multi-layer heterogeneous cladding tube with high strength: Based on the two stress-strain curves calculated in step f, find the stress value corresponding to the highest point in the two stress-strain curves. The stress value is the axial tensile strength and circumferential tensile strength of the multi-layer heterogeneous cladding tube. The model structure corresponding to the axial tensile strength and circumferential tensile strength is the designed high-strength heterogeneous cladding tube structure.

[0018] Furthermore, the geometric dimension information includes the thickness of SiC matrix, SiC fiber, and metal lining, which are 0.30-0.40 mm, 0.21-0.27 mm, and 0.9-1.0 mm, respectively; the height of the heterogeneous cladding tube is 31.45 mm, the inner diameter is 10.0-11.0 mm, and the outer diameter is 13.0-15.0 mm. The weaving path of SiC fiber is controlled by two parameter equations, which are:

[0019]

[0020]

[0021] Where R is the radius of the braided tube, mm; T is the thickness of the fiber braid, mm; w is the braiding angular velocity, rad / s; t is the time, s; v is the braiding linear velocity, mm / s.

[0022] Furthermore, the multi-layer heterogeneous cladding tube geometric model is formed by combining single-layer preform models with the same braiding angle according to their inner diameters and in an arrangement from the inner layer to the outer layer.

[0023] Furthermore, the three basis vectors of the SiC fiber are:

[0024]

[0025] In the formula, e1, e2, e3 are the first, second, and third basis vectors of SiC fiber, respectively; u2 is the basis vector of z axis in Cartesian coordinate system;

[0026] u is a vector field, is the Hamiltonian operator, t is the harmonic function, i and j are the unit basis vectors of the x-axis and y-axis in the Cartesian coordinate system respectively.

[0027] Furthermore, the three basis vectors of the SiC substrate and the metal liner are:

[0028]

[0029] v Z =v z

[0030]

[0031] In the formula, v x , v y , v z are the first, second and third basis vectors of SiC substrate and metal liner in Cartesian coordinate system, respectively. θ , v Z , v r are the first, second and third basis vectors of SiC substrate and metal liner in cylindrical coordinate system,

[0032] Furthermore, the incremental displacement series is set on the specified surface of the multi-layer heterogeneous cladding tube geometric model as follows: an axial incremental displacement series is set on the upper surface of the heterogeneous cladding tube and a radial incremental displacement series is set on the inner surface of the heterogeneous cladding tube. The former is set along the axial direction of the heterogeneous cladding tube with 0 mm as the starting value and 3×10 -3 mm is the step length, and 0.3 mm is the increasing series of the end value; the latter is along the radial direction of the heterogeneous cladding tube, with 0 mm as the starting value, 5×10 -4 mm is the step length, and 0.015mm is the increasing series of the end value.

[0033] Furthermore, the termination judgment method of the Newton iteration method is that the maximum number of iterations is 20 and the maximum relative error is 0.005.

[0034] By adopting the above technical solution, the advantages and beneficial effects of the present invention are:

[0035] The multilayer heterogeneous cladding tube of the present invention is composed of an inner layer of refractory metal and an outer layer of SiC f / SiC composite material, the thickness of the inner layer of refractory metal is 0.3-0.4mm, the outer layer of SiC f / SiC composite material is composed of 3 to 5 layers of SiC fiber preforms, and the braiding angle of each layer of SiC fiber preforms is 0° to 45°. The axial tensile strength of the multi-layer heterogeneous cladding tube with this structure can reach 225MPa, which is 17% to 28% higher than that of other two-dimensional woven multi-layer heterogeneous tubes. At the same time, the circumferential tensile strength of the multi-layer heterogeneous cladding tube with this structure is 183MPa to 190MPa, indicating that the structure also has good circumferential tensile strength.

[0036] The use of finite element method for structural design of multi-layer heterogeneous cladding tubes can not only reduce the cost of material development and testing, but also obtain the influence of different structures on the strength of heterogeneous cladding tubes through the analysis of stress-strain curves: the axial tensile strength decreases with the increase of braiding angle, while the circumferential tensile strength mainly depends on the strength of the lining metal.

[0037] In addition, structural design using the finite element method can also reduce the time cycle from material design to application, thereby achieving rapid optimization of the accident-tolerant fuel cladding structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A flowchart of the structure design of an embodiment of the present invention;

[0039] Figure 2 (a) is Mo-SiC f / SiC heterogeneous cladding tube, the inner layer is Mo metal lining, the outer layer is SiC f / SiC composite material, composed of 3 layers of SiC fiber preforms with a braiding angle of 30°, the SiC fiber preforms include SiC fiber SiC f And coated SiC fiber SiC f SiC matrix; (b) Nb-SiC f / SiC heterogeneous cladding tube, the inner layer is Nb metal lining, the outer layer is SiC f / SiC composite material, composed of 3 layers of SiC fiber preforms with a braiding angle of 45°, the SiC fiber preforms include SiC fiber SiC f And coated SiC fiber SiC f SiC matrix;

[0040] Figure 3 Axial stress-strain curve diagram calculated for an embodiment of the present invention;

[0041] Figure 4 This is a hoop stress-strain curve diagram calculated for an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0043] High-strength metal-SiC in the embodiment of the present invention f / SiC heterogeneous cladding tube structure: the inner layer is refractory metal and the outer layer is SiC f / SiC composite material, the design method is shown in Figure 1 .

[0044] Example 1

[0045] In this embodiment, metal-SiC f / SiC heterogeneous cladding tube has a layer of refractory metal molybdenum in the inner layer and three layers of SiC in the outer layer f / SiC composite material, the braiding angle is 30°, such as Figure 2 As shown in (a);

[0046] The specific design method is:

[0047] Step 1, establish the geometric model of multi-layer heterogeneous cladding tube: based on the image obtained by scanning electron microscope, record the geometric size information of SiC fiber, SiC matrix and metal lining, including the thickness of SiC matrix, SiC fiber and metal lining, which are 0.30mm, 0.21mm and 0.4mm respectively; the height of heterogeneous cladding tube is 31.45mm, the inner diameter is 10.0mm and the outer diameter is 12.6mm. The weaving path of SiC fiber is controlled by two parametric equations, which are:

[0048]

[0049]

[0050] Where R is the radius of the braided tube, mm; T is the thickness of the fiber braid, mm; w is the braiding angular velocity, rad / s; t is the time, s; v is the braiding linear velocity, mm / s;

[0051] Three groups of single-layer preform models with different braiding angles were constructed in COMSOL Multiphysics software. The braiding angle of each group of single-layer preform models was 30°. The overlaps and gaps in the single-layer preform models were removed by modifying the relative tolerance values ​​of the single-layer preform models. The single-layer preform models were then combined into a multi-layer heterogeneous cladding tube geometric model.

[0052] Step 2, solid meshing of the multi-layer heterogeneous cladding tube geometric model: based on the multi-layer heterogeneous cladding tube geometric model established in step 1, tetrahedral meshing is performed on each component of the model, namely, SiC matrix, SiC fiber, and metal liner;

[0053] Step 3, establish a curvilinear coordinate system: define the three basis vectors of SiC fiber by solving the Laplace equation:

[0054]

[0055] In the formula, e1, e2, e3 are the first, second, and third basis vectors of SiC fiber, respectively; u2 is the basis vector of z axis in Cartesian coordinate system;

[0056] The three basis vectors of SiC substrate and metal liner are defined by vector operation:

[0057]

[0058] v Z =v z

[0059]

[0060] In the formula, v x , v y , v z are the first, second and third basis vectors of SiC substrate and metal liner in Cartesian coordinate system, respectively. θ , v Z , v r are the first, second and third basis vectors of SiC substrate and metal liner in cylindrical coordinate system,

[0061] Step 4: Set the boundary conditions of the geometric model of the multilayer heterogeneous cladding tube: set an axial incremental displacement series on the upper surface of the heterogeneous cladding tube and a radial incremental displacement series on the inner surface of the heterogeneous cladding tube. The former is along the axial direction of the heterogeneous cladding tube, with 0 mm as the starting value and 3×10 -3 mm is the step length, and 0.3 mm is the increasing series of the end value; the latter is along the radial direction of the heterogeneous cladding tube, with 0 mm as the starting value, 5×10 -4 mm is the step length and 0.015mm is the increasing series of the terminal value to simulate the process of the heterogeneous cladding tube being subjected to axial tension and radial compression;

[0062] Step 5, define the mechanical damage criteria of each component of the multilayer heterogeneous cladding tube geometric model: the Hashin criterion (Formula 1) is used for SiC fiber, the first strength theory criterion (Formula 2) is used for SiC matrix, and the fourth strength theory criterion (Formula 3) is used for metal lining;

[0063] Formula 1:

[0064]

[0065] In the formula, σ 11 is the tensile stress, is the tensile strength, α is the contribution coefficient of shear stress, τ 12 is the shear stress, is the shear strength.

[0066] Formula 2:

[0067] σ 11θ ≥σ t ,σ 11θ >0

[0068] In the formula, σ 11θ is the tensile stress, σ t For tensile strength.

[0069] Formula 3:

[0070] (σ1-σ2) 2 +(σ2-σ3) 2+(σ3-σ1) 2 ≥2σ s 2

[0071] In the formula, σ1, σ2, σ3 are the first, second, and third principal stresses respectively, and σ s is the shear strength.

[0072] Step 6, calculate the stress-strain curve of the multi-layer heterogeneous cladding tube: Based on the finite element model of the multi-layer heterogeneous cladding tube established in step 5, the Newton iteration method is selected to solve the stress-strain curve of the heterogeneous cladding tube. The termination judgment method of the Newton iteration method is that the maximum number of iterations is 20 times, and the maximum relative error is 0.005. The calculation results are sorted out to complete the drawing of the axial stress-strain curve and the hoop stress-strain curve of the heterogeneous cladding tube, as shown in FIG. Figure 3 and Figure 4 As shown in the figure, it can be seen that: Figure 3 The axial stress value corresponding to the highest point of the type I and II curves is not less than 200MPa, indicating that the Mo-SiC with a braiding angle of 30° and 45° f / SiC heterogeneous cladding tube has good axial tensile strength; Figure 4 The hoop stress value corresponding to the highest point of the type I and II curves is not less than 183MPa, indicating that the Mo-SiC with a braiding angle of 30° and 45° f / SiC heterogeneous cladding tube has good circumferential tensile strength.

[0073] Step 7, determine the structural design of the multi-layer heterogeneous cladding tube with high strength: Based on the two stress-strain curves calculated in step 6, find the stress value corresponding to the highest point in the two stress-strain curves. The stress value is the axial tensile strength and circumferential tensile strength of the multi-layer heterogeneous cladding tube, such as Figure 3 ZhongIhe Figure 4 As shown in Figure Ⅲ, a three-layer Mo-SiC with a weaving angle of 30° f The axial tensile strength of the SiC heterogeneous cladding tube is 225MPa, and the circumferential tensile strength is 183MPa.

[0074] Embodiment 2:

[0075] In this embodiment, metal-SiC f / SiC heterogeneous cladding tube has a layer of refractory metal niobium as the inner layer and three layers of SiC as the outer layer f / SiC composite material, the braiding angle is 45°, such as Figure 2 As shown in (b);

[0076] The specific design method is:

[0077] Step 1, establish the geometric model of multi-layer heterogeneous cladding tube: based on the image obtained by scanning electron microscope, record the geometric size information of SiC fiber, SiC matrix and metal lining, including the thickness of SiC matrix, SiC fiber and metal lining, which are 0.40mm, 0.27mm and 0.3mm respectively. The height of heterogeneous cladding tube is 31.45mm, the inner diameter is 11.0mm and the outer diameter is 14.0mm. The weaving path of SiC fiber is controlled by two parametric equations, which are:

[0078]

[0079]

[0080] Where R is the radius of the braided tube, mm; T is the thickness of the fiber braid, mm; w is the braiding angular velocity, rad / s; t is the time, s; v is the braiding linear velocity, mm / s;

[0081] Three groups of single-layer preform models with different braiding angles were constructed in COMSOL Multiphysics software. The braiding angle of each group of single-layer preform models was 45°. The overlaps and gaps in the single-layer preform models were removed by modifying the relative tolerance values ​​of the single-layer preform models. Then, the single-layer preform models were combined into a multi-layer heterogeneous cladding tube geometric model.

[0082] Step 2, solid meshing of the multi-layer heterogeneous cladding tube geometric model: based on the multi-layer heterogeneous cladding tube geometric model established in step 1, tetrahedral meshing is performed on each component of the model, namely, SiC matrix, SiC fiber, and metal liner;

[0083] Step 3, establish a curvilinear coordinate system: define the three basis vectors of SiC fiber by solving the Laplace equation:

[0084]

[0085] In the formula, e1, e2, e3 are the first, second, and third basis vectors of SiC fiber, respectively; u2 is the basis vector of z axis in Cartesian coordinate system;

[0086] The three basis vectors of SiC substrate and metal liner are defined by vector operation:

[0087]

[0088] v Z =v z

[0089]

[0090] In the formula, vx , v y , v z are the first, second and third basis vectors of SiC substrate and metal liner in Cartesian coordinate system, respectively. θ , v Z , v r are the first, second and third basis vectors of SiC substrate and metal liner in cylindrical coordinate system,

[0091] Step 4: Set the boundary conditions of the geometric model of the multilayer heterogeneous cladding tube: set an axial incremental displacement series on the upper surface of the heterogeneous cladding tube and a radial incremental displacement series on the inner surface of the heterogeneous cladding tube. The former is along the axial direction of the heterogeneous cladding tube, with 0 mm as the starting value and 3×10 -3 mm is the step length, and 0.3 mm is the increasing series of the end value; the latter is along the radial direction of the heterogeneous cladding tube, with 0 mm as the starting value, 5×10 -4 mm is the step length and 0.015mm is the increasing series of the terminal value to simulate the process of the heterogeneous cladding tube being subjected to axial tension and radial compression;

[0092] Step 5, define the mechanical damage criteria of each component of the multilayer heterogeneous cladding tube geometric model: the Hashin criterion (Formula 1) is used for SiC fiber, the first strength theory criterion (Formula 2) is used for SiC matrix, and the fourth strength theory criterion (Formula 3) is used for metal lining;

[0093] Formula 1:

[0094]

[0095] In the formula, σ 11 is the tensile stress, is the tensile strength, α is the contribution coefficient of shear stress, τ 12 is the shear stress, is the shear strength.

[0096] Formula 2:

[0097] σ 11θ ≥σ t ,σ 11θ >0

[0098] In the formula, σ 11θ is the tensile stress, σ t For tensile strength.

[0099] Formula 3:

[0100] (σ1-σ2) 2 +(σ2-σ3) 2 +(σ3-σ1) 2 ≥2σs 2

[0101] In the formula, σ1, σ2, σ3 are the first, second, and third principal stresses respectively, and σ s is the shear strength.

[0102] Step 6, calculate the stress-strain curve of the multi-layer heterogeneous cladding tube: Based on the finite element model of the multi-layer heterogeneous cladding tube established in step 5, the Newton iteration method is selected to solve the stress-strain curve of the heterogeneous cladding tube. The termination judgment method of the Newton iteration method is that the maximum number of iterations is 20 times, and the maximum relative error is 0.005. The calculation results are sorted out to complete the drawing of the axial stress-strain curve and the hoop stress-strain curve of the heterogeneous cladding tube, as shown in FIG. Figure 3 and Figure 4 shown.

[0103] Step 7, determine the structural design of the multi-layer heterogeneous cladding tube with high strength: Based on the two stress-strain curves calculated in step 6, find the stress value corresponding to the highest point in the two stress-strain curves. The stress value is the axial tensile strength and circumferential tensile strength of the multi-layer heterogeneous cladding tube, such as Figure 3 Medium II and Figure 4 As shown in Figure Ⅰ, three layers of Mo-SiC with a braiding angle of 45° f The axial tensile strength of the SiC heterogeneous cladding tube is 205MPa, and the circumferential tensile strength is 190MPa.

[0104] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A high-strength metal - SiC f / SiC heterogeneous cladding tube structure, characterized in that: Including inner metal lining and outer SiC f / SiC composite material, the inner metal lining is refractory metal, the outer SiC f / SiC composite material is composed of 3 to 5 layers of SiC fiber preforms with the same braiding angle. f and coated SiC fiber preform SiC f The SiC matrix is ​​composed of a preform, and the SiC fibers in each layer of the preform are in a two-dimensional woven manner, and the woven angle is in the range of 0° to 45°, and the woven angle is the angle between the axis of the SiC fiber and the axis of the heterogeneous cladding tube.

2. A high-strength metal-SiC according to claim 1 f / SiC heterogeneous cladding tube structure, characterized in that: The refractory metal is one of rhenium, zirconium, molybdenum, tantalum and niobium.

3. A high-strength metal-SiC according to claim 1 f / SiC heterogeneous cladding tube structure, characterized in that: The thickness of the inner metal lining is 0.3mm~0.4mm, SiC f The thickness of the / SiC composite material is 0.9mm-1.5mm, the volume fraction of SiC fiber is not less than 30%, the inner diameter of the heterogeneous cladding tube is 10.0mm-11.0mm, the axial tensile strength of the heterogeneous cladding tube is not less than 200MPa, and the circumferential tensile strength is 183MPa-190MPa.

4. A high-strength metal-SiC as claimed in any one of claims 1 to 3 f / SiC heterogeneous cladding tube structure design method, characterized in that, The following steps are involved: A. Establishing a geometric model of a multi-layer heterogeneous cladding tube: Based on the images obtained by scanning electron microscopy, the geometric size information of SiC fiber, SiC matrix, and metal lining was recorded, and three groups of single-layer preform models with different braiding angles were constructed in COMSOL Multiphysics software. The braiding angle of each group of single-layer preform models was 0° to 45°. The overlaps and gaps in the single-layer preform models were removed by modifying the relative tolerance value of the single-layer preform models, and then the single-layer preform models were combined into a geometric model of a multi-layer heterogeneous cladding tube; B. Performing entity meshing on the geometric model of the multilayer heterogeneous cladding tube: Based on the geometric model of the multilayer heterogeneous cladding tube established in step a, tetrahedral meshing is performed on each component of the model, namely, SiC matrix, SiC fiber, and metal liner; C. Establishing a curvilinear coordinate system: defining the three basis vectors of SiC fiber by solving the Laplace equation, defining the three basis vectors of SiC matrix and metal liner by vector operation, and completing the establishment of the curvilinear coordinate system of SiC matrix, SiC fiber and metal liner; D. Setting boundary conditions of the multi-layer heterogeneous cladding tube geometric model: setting an incremental displacement series on the specified surface of the multi-layer heterogeneous cladding tube geometric model to simulate the process of the heterogeneous cladding tube being subjected to axial tension and radial compression; E. Define the mechanical damage criteria of each component of the multi-layer heterogeneous cladding tube geometric model: SiC fiber adopts the Hashin criterion, SiC matrix adopts the first strength theory criterion, and metal lining adopts the fourth strength theory criterion, completing the establishment of the finite element model of the multi-layer heterogeneous cladding tube; F. Calculate the stress-strain curve of the multi-layer heterogeneous cladding tube: Based on the finite element model of the multi-layer heterogeneous cladding tube established in step e, select the Newton iteration method to solve the stress-strain curve of the heterogeneous cladding tube, and complete the drawing of the axial stress-strain curve and the hoop stress-strain curve of the heterogeneous cladding tube; G. Determine the structural design of a multi-layer heterogeneous cladding tube with high strength: Based on the two stress-strain curves calculated in step f, find the stress value corresponding to the highest point in the two stress-strain curves. The stress value is the axial tensile strength and circumferential tensile strength of the multi-layer heterogeneous cladding tube. The model structure corresponding to the axial tensile strength and circumferential tensile strength is the designed high-strength heterogeneous cladding tube structure.

5. A high-strength metal-SiC according to claim 4 f / SiC heterogeneous cladding tube structure design method, characterized in that, The geometric dimension information described in step A, including the thickness of SiC matrix, SiC fiber, and metal lining, are 0.30-0.40 mm, 0.21-0.27 mm, and 0.9-1.0 mm, respectively; the height of the heterogeneous cladding tube is 31.45 mm, the inner diameter is 10.0-11.0 mm, and the outer diameter is 13.0-15.0 mm. The braiding path of SiC fiber is controlled by two parameter equations, which are: Where R is the radius of the braided tube, mm; T is the thickness of the fiber braid, mm; w is the braiding angular velocity, rad / s; t is the time, s; v is the braiding linear velocity, mm / s.

6. A high-strength metal-SiC according to claim 4 f / SiC heterogeneous cladding tube structure design method, characterized in that, The multi-layer heterogeneous cladding tube geometric model described in step A is formed by combining single-layer preform models with the same braiding angle according to their inner diameters and in an arrangement from the inner layer to the outer layer to form a multi-layer heterogeneous cladding tube model.

7. A high-strength metal-SiC according to claim 4 f / SiC heterogeneous cladding tube structure design method, characterized in that, The three basis vectors of the SiC fiber described in step C are: In the formula, e1, e2, e3 are the first, second, and third basis vectors of SiC fiber, respectively; u2 is the basis vector of z axis in Cartesian coordinate system; u is a vector field, is the Hamiltonian operator, t is the harmonic function, i and j are the unit basis vectors of the x-axis and y-axis in the Cartesian coordinate system respectively.

8. A high-strength metal-SiC according to claim 4 f / SiC heterogeneous cladding tube structure design method, characterized in that, The three basis vectors of the SiC substrate and the metal liner described in step C are: v Z =v z In the formula, v x , v y , v z are the first, second and third basis vectors of SiC substrate and metal liner in Cartesian coordinate system, respectively. θ , v Z , v r are the first, second and third basis vectors of SiC substrate and metal liner in cylindrical coordinate system, 9. A high-strength metal-SiC according to claim 4 f / SiC heterogeneous cladding tube structure design method, characterized in that, The step D of setting an increasing displacement sequence on the specified surface of the multi-layer heterogeneous cladding tube geometric model is as follows: setting an axial increasing displacement sequence on the upper surface of the heterogeneous cladding tube and setting a radial increasing displacement sequence on the inner surface of the heterogeneous cladding tube. The former is along the axial direction of the heterogeneous cladding tube, with 0 mm as the starting value and 3×10 -3 mm is the step length, and 0.3 mm is the increasing series of the end value; the latter is along the radial direction of the heterogeneous cladding tube, with 0 mm as the starting value, 5×10 -4 mm is the step length, and 0.015mm is the increasing series of the end value.

10. A high-strength metal-SiC according to claim 4 f / SiC heterogeneous cladding tube structure design method, characterized in that, The termination judgment method of the Newton iteration method described in step f is that the maximum number of iterations is 20 times and the maximum relative error is 0.005.

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