Hot isostatic pressing connection method for nickel-based alloy and niobium-based alloy with double intermediate layers

Abstract

The invention belongs to the technical field of nuclear fusion, and particularly relates to a hot isostatic pressing connection method for nickel-based alloy and niobium-based alloy with double intermediate layers. The method comprises the following steps of machining, sheath manufacturing, cleaning, assembling, packaging, leakage detecting, vacuumizing, clamping and sealing and hot isostatic pressing. By adding the palladium / palladium-based alloy and the molybdenum-based alloy as double intermediate layers and controlling a hot isostatic pressing system, reliable metallurgical bonding of a connection interface is realized, no intermetallic compound is generated, element transition of the connection interface is uniform, and the whole body has relatively high high-temperature connection strength; the method can be used for manufacturing a nickel-based alloy and niobium-based alloy connecting part in a high-temperature fusion reactor, and the comprehensive use performance of the material can be met.

Description

Technical Field

[0001] The present invention belongs to the field of nuclear fusion, and particularly relates to a hot isostatic pressing connection method for a nickel-based alloy and a niobium-based alloy with a double intermediate layer. Background Art

[0002] As the core component of the fourth-generation clean energy system, the performance of nuclear energy structural materials is directly related to the safe and economic operation of the reactor. In the design of the fusion reactor blanket structure, the materials need to withstand extreme multi-field coupling conditions and face complex thermo-mechanical load cycles. Based on thermodynamic calculations and irradiation damage theory, the blanket structure materials need to have a low thermal neutron absorption cross-section and a fast neutron activation cross-section, and preferably low-activation materials to reduce the yield of radioactive waste. Moreover, it is necessary to maintain high tensile strength and yield strength in the temperature range of 773-1273K. For the high-temperature working conditions of the fuel assembly cladding, the material selection follows the principle of crystal structure stability. MoNbZr alloy, Nb1Zr alloy, and Mo-Re alloy are the current optimal choices. For the reactor pressure vessel and the primary loop pipeline system, the nickel-based superalloy GH3230 strengthened by γ' phase is used, which has high creep strength at high temperatures, and the alloy can still maintain a low corrosion rate in a high-temperature halogen environment.

[0003] The connection technology between the nickel-based superalloy GH3230 and the niobium-based alloy Nb1Zr is a key technical bottleneck in the structural integration of the fourth-generation nuclear reactor. The core scientific problem stems from the thermodynamic incompatibility and physical property mismatch of the material system. The interface engineering for joining heterogeneous materials Nb-based alloy Nb1Zr and Ni-based alloy GH3230 needs to solve two key problems: the thermal stress concentration caused by thermal expansion mismatch and the generation and suppression of brittle phases (such as Laves phase, σ phase) at the interface. The difference in the thermal expansion coefficients of the material system causes multiple interface problems such as thermal cycle stress concentration, geometric constraint effect, and crack propagation tendency. Several intermetallic compounds such as Ni8Nb, Ni3Nb, and Ni6Nb7 form a continuous brittle layer at the interface, resulting in a sharp drop in the interface bonding strength.

[0004] Based on the stringent requirements of the fourth-generation nuclear energy system for the reliability of material connection, three types of solid-state connection technologies are mainly used in current engineering practices: the explosive welding technology has process limitations that the materials need to meet dynamic plasticity conditions, the interfacial wavy structure is likely to cause the porosity to be greater than 5%, and it is difficult to control the dimensional tolerance; the brazing technology has a significant attenuation of the high-temperature strength of the joint, and the thermal fatigue life of the brazing seam is only 200-300 times; the hot isostatic pressing diffusion connection eliminates the interface pores through triaxial isostatic pressure. After X-ray tomography verification, the porosity is less than 0.03%, the width of the interface diffusion zone can be controlled within 10-50μm, and batch production of complex components can be achieved. Summary of the Invention

[0005] In view of this, the present invention provides a hot isostatic pressing connection method for nickel-based alloy and niobium-based alloy with a double interlayer. By adding two appropriate interlayers and controlling the hot pressing regime, reliable metallurgical bonding of the connection joint is achieved, no intermediate phase is generated, and the elements at the connection interface are evenly distributed. The connection joint also has high connection strength at high temperatures, and can be used for manufacturing the connection components of nickel-based alloy and niobium-based alloy in a high-temperature fusion reactor, meeting the comprehensive service performance requirements of the materials.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The present invention provides a hot isostatic pressing connection method for nickel-based alloy and niobium-based alloy with a double interlayer, comprising the following steps:

[0008] Step 1, machining: machining the nickel-based alloy workpiece ③ and the niobium-based alloy workpiece ⑥ to the required sizes respectively;

[0009] Step 2, jacket manufacturing: machining the cover plate ② and the outer jacket ⑦;

[0010] Step 3, cleaning: cleaning all the workpieces;

[0011] Step 4, assembling: sequentially loading the niobium-based alloy workpiece ⑥, the transition layer thin sheet ⑤, the transition layer thin sheet ④, and the nickel-based alloy workpiece ③ into the outer jacket ⑦;

[0012] Step 5, encapsulating: welding the evacuation pipe ① and the cover plate ②, and the cover plate ② and the outer jacket ⑦ by electron beam welding or argon arc welding. During the welding process, inert gas protection is required. When welding the cover plate ② and the outer jacket ⑦, the outer jacket ⑦ should be placed in water;

[0013] Step 6, leak detection: performing leak detection on the outer jacket after welding, with the leak rate ≤ 10 -9 Pa·m 3 / s;

[0014] Step 7, vacuum pumping: pumping the jacket after leak detection to vacuum;

[0015] Step 8, clamping and sealing: heating and clamping the evacuation pipe ① on the jacket after baking, and keeping the vacuum degree below 1.0×10 -3 Pa throughout the process;

[0016] Step 9, hot isostatic pressing: placing the clamped jacket in a hot isostatic pressing furnace for diffusion connection, and using high-purity argon as the pressurizing gas; in the said step (1), the material of the nickel-based alloy workpiece ③ is GH3230, the material of the transition layer thin sheet ④ is pure Pd or Pd-based alloy, the material of the transition layer thin sheet ⑤ is Mo-based alloy, and the material of the niobium-based alloy workpiece ⑥ is Nb1Zr alloy.

[0017] In the said step 1, ensure that the surface roughness Ra ≤ 0.8 μm.

[0018] In Step 2, ensure that the surface is smooth, and the surface roughness Ra ≤ 1.6 μm.

[0019] In Step 3, after degreasing the air extraction pipe ①, cover plate ②, nickel-based alloy workpiece ③, transition layer sheet ④, transition layer sheet ⑤, niobium-based alloy workpiece ⑥, and outer sheath ⑦, place them in an acetone cleaning solution and ultrasonically clean for 15 min. Then, place the ultrasonically cleaned materials in a rust removal solution to remove the surface oxide layer, and then ultrasonically clean the material surface with alcohol for 15 min.

[0020] In Step 7, heating is only allowed when the vacuum degree is lower than 2.0×10 -3 Pa; heat up to 450 °C, and start heat preservation when the vacuum degree is lower than 2.0×10 -3 Pa, keep the temperature for 3 h, and then remove from the furnace and air-cool.

[0021] In Step 9, the hot isostatic pressing temperature is 1220 - 1290 °C, the heat preservation time is 3 - 5 h, the pressure ≥ 150 MPa. Then, cool with the furnace to below 200 °C and remove from the furnace, and air-cool to room temperature.

[0022] The beneficial effects of the present invention are as follows:

[0023] (1) The present invention adopts a double intermediate layer hot isostatic pressing diffusion bonding method to achieve reliable metallurgical bonding between nickel-based alloy and niobium-based alloy, with good bonding quality;

[0024] (2) For the double intermediate layer hot isostatic pressing connection method of nickel-based alloy and niobium-based alloy provided by the present invention, there are no defects at the three connection interfaces between nickel-based alloy and niobium-based alloy, the interface elements are evenly distributed, and the overall has high high-temperature bonding strength;

[0025] (3) For the double intermediate layer hot isostatic pressing connection method of nickel-based alloy and niobium-based alloy provided by the present invention, by adding a suitable double intermediate layer and controlling the hot pressing process, no intermetallic compounds are generated at the connection interface;

[0026] (4) For the double intermediate layer hot isostatic pressing connection method of nickel-based alloy and niobium-based alloy provided by the present invention, it is suitable for manufacturing large-area connection components of nickel-based alloy and niobium-based alloy for future fusion reactors, and can meet the requirements of high-temperature use. Description of the Drawings

[0027] Figure 1 It is a schematic diagram of placing in the sheath in the order of niobium-based alloy, Mo-based alloy sheet, Pd / Pd-based alloy sheet, and nickel-based superalloy;

[0028] Figure 2 It is a schematic diagram of the assembly of the workpiece and the sheath;

[0029] Figure 3 Schematic diagram of the workpiece after sealing

[0030] Among them, 1 - extraction pipe, 2 - cover plate, 3 - GH3230 workpiece, 4 - Pd / Pd-based alloy thin sheet, 5 - Mo-based alloy thin sheet, 6 - Nb1Zr alloy workpiece, 7 - outer sheath. Specific implementation manner

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. The embodiments described below are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. In addition, unless otherwise specified, the methods without specific conditions or steps recorded are all conventional methods, and the reagents and materials used can be obtained from commercial channels.

[0033] Embodiment 1

[0034] A hot isostatic pressing connection method for nickel-based alloy and niobium-based alloy with double intermediate layers provided by the present invention, referring to Figure 1 , the material of the extraction pipe ① is pure iron / stainless steel, the material of the cover plate ② is pure iron / stainless steel, the material of the workpiece ③ is nickel-based superalloy GH3230, the material of the workpiece ④ is pure Pd, the material of the workpiece ⑤ is TZM molybdenum alloy, the material of the workpiece ⑥ is niobium-based alloy Nb1Zr alloy, and the material of the outer sheath ⑦ is pure iron / stainless steel. The specific steps are as follows:

[0035] Step 1, machining: Both the nickel-based superalloy workpiece ③ and the niobium-based alloy workpiece ⑥ are machined to Φ50×35mm, and the surface is finely machined to ensure that the surface roughness Ra of the surface to be joined ≤ 0.8μm; the thickness of the transition layer thin sheet ④ is 0.15mm, the thickness of the transition layer thin sheet ⑤ is 0.15mm, and the surface is polished to ensure that the surface roughness Ra of the surface to be joined ≤ 0.8μm.

[0036] Step 2, sheath manufacturing: The cover plate ② and the outer sheath ⑦ are machined, with a thickness of 4 - 5mm, the depth of the outer sheath ⑦ is 80 - 85mm, there are no visual and penetrant inspection defects, and the surface is ensured to be smooth, with a roughness Ra ≤ 1.6μm.

[0037] Step 3, Cleaning: After degreasing the suction pipe ①, cover plate ②, nickel-based superalloy workpiece ③, transition layer thin sheet ④, transition layer thin sheet ⑤, niobium-based alloy workpiece ⑥, and outer sleeve ⑦, place them in an acetone cleaning solution and ultrasonically clean for 15 minutes. Then, place the ultrasonically cleaned materials in a rust removal solution to remove the surface oxide layer, and then ultrasonically clean the material surface with alcohol for 15 minutes.

[0038] Step 4, Assembly: Sequentially load the niobium-based alloy workpiece ⑥, transition layer thin sheet ⑤, transition layer thin sheet ④, and nickel-based alloy workpiece ③ into the outer sleeve ⑦;

[0039] Step 5, Encapsulation: Use electron beam welding or argon arc welding to weld the suction pipe ① and the cover plate ②, and the cover plate ② and the outer sleeve ⑦. During the welding process, an inert gas protection is required. When welding the cover plate ② and the outer sleeve ⑦, the outer sleeve ⑦ should be placed in water;

[0040] Step 6, Leak Detection: After welding, perform leak detection on the outer sleeve. The leak rate ≤ 10 -9 Pa·m 3 / s;

[0041] Step 7, Vacuum Pumping: Pump the vacuum for the sleeved package after leak detection. Only when the vacuum degree is lower than 2.0×10 -3 Pa is it allowed to heat up. Heat up to 450 °C. When the vacuum degree is lower than 2.0×10 -3 Pa, start heat preservation for 3 hours, and then take it out of the furnace and air-cool.

[0042] Step 8, Clamping and Sealing: After baking, heat and clamp the suction pipe ① on the sleeved package. The whole process maintains a vacuum degree lower than 1.0×10 -3 Pa;

[0043] Step 9, Hot Isostatic Pressing: Place the clamped and sealed sleeved package in a hot isostatic pressing furnace for diffusion bonding. The pressurized gas uses high-purity argon. The hot isostatic pressing temperature is 1250 °C, the heat preservation time is 3 hours, the pressure ≥ 150 MPa. Then, cool it in the furnace to 200 °C and take it out, and air-cool to room temperature.

[0044] After hot isostatic pressing, perform microstructure analysis on the interface. The interface connection is good, without defects, and the element transition is uniform. The tensile strength of the connector is 280 MPa, and the yield strength is 214 MPa.

[0045] Example 2

[0046] A method for hot isostatic pressing connection of nickel-based alloy and niobium-based alloy with double intermediate layers provided by the present invention, referring to Figure 1, the material of the extraction pipe ① is pure iron / stainless steel, the material of the cover plate ② is pure iron / stainless steel, the material of the workpiece ③ is the nickel-based superalloy GH3230, the material of the workpiece ④ is pure Pd, the material of the workpiece ⑤ is MoRe alloy, the material of the workpiece ⑥ is the niobium-based alloy Nb1Zr alloy, and the material of the outer cladding ⑦ is pure iron / stainless steel. The specific steps are as follows:

[0047] Step 1, machining: Machine the nickel-based superalloy workpiece ③ to Φ50×35mm, and finish-machine the surface to ensure that the surface roughness Ra of the surface to be joined is ≤0.8μm; The niobium-based alloy workpiece ⑥ is filled in powder form and vibrated to compact; The thickness of the transition layer sheet ④ is 0.15mm, the thickness of the transition layer sheet ⑤ is 0.15mm, and the surface is polished to ensure that the surface roughness Ra of the surface to be joined is ≤0.8μm.

[0048] Step 2, jacket manufacturing: Machine the cover plate ② and the outer cladding ⑦, with a thickness of 4 - 5mm, the depth of the outer cladding ⑦ is 90 - 100mm, without visual and penetrant inspection defects, ensuring a smooth surface with a roughness Ra ≤1.6μm.

[0049] Step 3, cleaning: After degreasing the extraction pipe ①, cover plate ②, nickel-based superalloy workpiece ③, transition layer sheet ④, transition layer sheet ⑤, and outer cladding ⑦, place them in an acetone cleaning solution and ultrasonically clean for 15min. Then, place the ultrasonically cleaned materials in a rust-removing solution to remove the surface oxide layer, and then ultrasonically clean the material surface with alcohol for 15min.

[0050] Step 4, assembly: Sequentially install the niobium-based alloy workpiece ⑥, transition layer sheet ⑤, transition layer sheet ④, and nickel-based alloy workpiece ③ into the outer cladding ⑦; The niobium-based alloy workpiece ⑥ is filled in powder form, and after filling, it is vibrated with a aging instrument to ensure that the height is not less than 50mm.

[0051] Step 5, encapsulation: Use electron beam welding or argon arc welding to weld the extraction pipe ① and the cover plate ②, and the cover plate ② and the outer cladding ⑦. During the welding process, an inert gas protection is required. When welding the cover plate ② and the outer cladding ⑦, the outer cladding ⑦ should be placed in water.

[0052] Step 6, leak detection: After welding, perform leak detection on the outer cladding, with a leak rate ≤10 -9 Pa·m 3 / s.

[0053] Step 7, evacuation: Evacuate the jacket after leak detection. Only when the vacuum degree is lower than 2.0×10 -3 Pa is it allowed to heat up. Heat up to 450°C. When the vacuum degree is lower than 2.0×10 -3 Pa, start heat preservation for 3h, and then take it out of the furnace and air-cool.

[0054] Step 8, Clamping and Sealing: After baking, heat and clamp the air extraction pipe ① on the envelope, and keep the vacuum degree below 1.0×10 -3 Pa throughout the process.

[0055] Step 9, Hot Isostatic Pressing: Place the clamped envelope in a hot isostatic pressing furnace for diffusion bonding. The pressurizing gas is high-purity argon. The hot isostatic pressing temperature is 1250 °C, the holding time is 3 h, the pressure is ≥150 MPa. Then cool it in the furnace to 200 °C and take it out of the furnace, and air-cool it to room temperature.

[0056] After hot isostatic pressing, perform microstructure analysis on the interface. The interface is well bonded, without defects, and the element transition is uniform. The tensile strength of the connector is 350 MPa, the yield strength is 219 MPa, and the tensile strength at 1123 K is 77 MPa.

[0057] Example 3

[0058] A method for hot isostatic pressing connection of a nickel-based alloy and a niobium-based alloy with double intermediate layers provided by the present invention refers to Figure 1 , the material of the air extraction pipe ① is pure iron / stainless steel, the material of the cover plate ② is pure iron / stainless steel, the material of the workpiece ③ is the nickel-based superalloy GH3230, the material of the workpiece ④ is PdW alloy, the material of the workpiece ⑤ is MoLa alloy, the material of the workpiece ⑥ is the niobium-based alloy Nb1Zr alloy, and the material of the outer envelope ⑦ is pure iron / stainless steel. The specific steps are as follows:

[0059] Step 1, Machining: Machine both the nickel-based superalloy workpiece ③ and the niobium-based alloy workpiece ⑥ to Φ50×35 mm, and finish machining the surface to ensure that the surface roughness Ra of the surface to be connected is ≤0.8 μm; the thickness of the transition layer thin sheet ④ is 0.15 mm, the thickness of the transition layer thin sheet ⑤ is 0.15 mm, and polish the surface to ensure that the surface roughness Ra of the surface to be connected is ≤0.8 μm.

[0060] Step 2, Envelope Manufacturing: Machine the cover plate ② and the outer envelope ⑦, both with a thickness of 4 - 5 mm, and the depth of the outer envelope ⑦ is 80 - 85 mm, without visual and penetrant inspection defects, ensuring a smooth surface with a roughness Ra ≤1.6 μm.

[0061] Step 3, Cleaning: After degreasing the air extraction pipe ①, cover plate ②, nickel-based superalloy workpiece ③, transition layer thin sheet ④, transition layer thin sheet ⑤, niobium-based alloy workpiece ⑥, and outer envelope ⑦, place them in an acetone cleaning solution for ultrasonic cleaning for 15 min. Place the ultrasonically cleaned materials in a rust removal solution to remove the surface oxide layer, and then ultrasonically clean the surface of the materials with alcohol for 15 min.

[0062] Step 4, Assembly: Sequentially load the niobium-based alloy workpiece ⑥, transition layer thin sheet ⑤, transition layer thin sheet ④, and nickel-based alloy workpiece ③ into the outer envelope ⑦;

[0063] Step 5. Encapsulation: Weld the extraction pipe ① with the cover plate ② and the cover plate ② with the outer sleeve ⑦ by electron beam welding or argon arc welding. During the welding process, an inert gas protection shall be provided. When welding the cover plate ② and the outer sleeve ⑦, the outer sleeve ⑦ shall be placed in water.

[0064] Step 6. Leak detection: After welding, perform leak detection on the outer sleeve. The leak rate ≤ 10 -9 Pa·m 3 / s;

[0065] Step 7. Vacuum pumping: Pump the air out of the sleeved part after leak detection. Heating is only allowed when the vacuum degree is lower than 2.0×10 -3 Pa. Heat up to 450 °C and start heat preservation when the vacuum degree is lower than 2.0×10 -3 Pa. Keep the heat for 3 h and then cool in air after taking out of the furnace.

[0066] Step 8. Clamping and sealing: After baking, heat and clamp the extraction pipe ① on the sleeved part. The whole process shall maintain a vacuum degree lower than 1.0×10 -3 Pa;

[0067] Step 9. Hot isostatic pressing: Place the sleeved part after clamping and sealing into a hot isostatic pressing furnace for diffusion bonding. The pressurizing gas shall be high-purity argon. The hot isostatic pressing temperature is 1250 °C, the heat preservation time is 3 h, and the pressure ≥ 150 MPa. Then cool with the furnace to 200 °C and take out of the furnace, and then cool in air to room temperature.

[0068] After hot isostatic pressing, perform a microstructure analysis on the interface. The interface connection is good, without defects, and the element transition is uniform. The tensile strength of the connector is 280 MPa and the yield strength is 213 MPa.

[0069] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0070] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hot isostatic pressing method for joining a nickel-based alloy and a niobium-based alloy with a double intermediate layer, characterized in that: The steps include: Step (1), machining: machining the nickel-based high-temperature alloy workpiece ③ and the niobium-based alloy workpiece ⑥ to required sizes respectively; Step (2), sheath production: processing cover plate ② and outer sheath ⑦; Step (3), cleaning: cleaning all workpieces; Step (4), assembly: sequentially placing the niobium-based alloy workpiece ⑥, the transition layer sheet ⑤, the transition layer sheet ④, and the nickel-based high-temperature alloy workpiece ③ into the outer sleeve ⑦; Step (5), packaging: using electron beam welding or argon arc welding to weld the exhaust pipe ① and the cover plate ②, and the cover plate ② and the outer sheath ⑦, the welding process needs to be protected by inert gas, and the outer sheath ⑦ should be placed in water when the cover plate ② and the outer sheath ⑦ are welded; Step (6), leak detection: After welding, leak detection is performed on the outer sleeve, and the leak rate is ≤10 -9 Pa·m 3 / s; Step (7), vacuuming: vacuuming the package after leak detection; Step (8), clamping and sealing: After baking, the vacuum pipe ① on the package is heated and clamped, and the vacuum degree is kept below 1.0×10 -3 Pa; Step (9), hot isostatic pressing: placing the sealed package in a hot isostatic pressing furnace for diffusion bonding, and the pressurized gas is high-purity argon; in the step (1), the material of the nickel-based high-temperature alloy workpiece ③ is GH3230 or other nickel-based alloys, the material of the transition layer sheet ④ is pure Pd or Pd-based alloy, the material of the transition layer sheet ⑤ is Mo-based alloy, and the material of the niobium-based alloy workpiece ⑥ is Nb1Zr alloy or other niobium-based alloy.

2. The method for hot isostatic pressing of a double-intermediate layer nickel-based alloy and a niobium-based alloy according to claim 1, characterized in that: In the step (1), the surface roughness Ra of the nickel-based high-temperature alloy workpiece ③ and the niobium-based alloy workpiece ⑥ is ensured to be ≤ 0.8 μm.

3. The method for hot isostatic pressing of a double-intermediate layer nickel-based alloy and a niobium-based alloy according to claim 1, characterized in that: In the step (2), the surface is ensured to be smooth and the roughness Ra≤1.6 μm.

4. The method for hot isostatic pressing of a double-intermediate nickel-based alloy and a niobium-based alloy according to claim 1, characterized in that: Before the step (3), the surface roughness Ra of the transition layer sheets ④ and ⑤ is ensured to be ≤ 0.8 μm.

5. The method for hot isostatic pressing of a double-intermediate layer nickel-based alloy and a niobium-based alloy according to claim 1, characterized in that: In the step (3), the exhaust pipe ①, the cover plate ②, the nickel-based high-temperature alloy workpiece ③, the transition layer sheet ④, the transition layer sheet ⑤, the niobium-based alloy workpiece ⑥, and the outer sleeve ⑦ are deoiled and then ultrasonically cleaned in an acetone cleaning solution for 15 minutes. The ultrasonically cleaned material is placed in a rust removal solution to remove the surface oxide layer, and then the surface of the material is ultrasonically cleaned with alcohol for 15 minutes.

6. The method for hot isostatic pressing of a double-intermediate layer nickel-based alloy and a niobium-based alloy according to claim 1, characterized in that: In the step (7), the vacuum degree is less than 2.0×10 -3 Pa, the temperature is allowed to rise to 450 ° C, and the vacuum degree is less than 2.0 × 10 -3 Start keeping warm at 12:00 pm for 3 hours and then air cool after taking out of the furnace.

7. The method for hot isostatic pressing of a double-intermediate layer nickel-based alloy and a niobium-based alloy according to claim 1, characterized in that: In the step (9), the hot isostatic pressing temperature is 1220-1290° C., the holding time is 3-5 hours, the pressure is ≥150 MPa, and then the product is cooled to below 200° C. and then air-cooled to room temperature.

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