A high pressure high oxygen atmosphere hot isostatic pressing furnace and a method of processing superconducting wire tape therefrom

Abstract

This invention discloses a high-pressure, high-oxygen atmosphere hot isostatic pressing furnace. The furnace includes an outer high-pressure component filled with high-pressure inert gas, and an inner high-pressure component containing the sample and filled with a high-pressure, high-oxygen atmosphere. These components are separated by a high-temperature alloy isolation cover with an external heating element, and a pressure control component is also provided. This invention, through a dual-cavity pressure-splitting isolation design, fundamentally isolates the heating element from contact with the high-oxygen corrosive atmosphere, significantly extending the service life of the heating element and equipment, reducing equipment downtime, and eliminating the need for the isolation cover to bear high pressure differential load. This significantly reduces the difficulty of equipment manufacturing and material costs, resulting in good temperature uniformity within the furnace. Furthermore, hot isostatic pressing of Bi-based high-temperature superconducting wires and strips effectively eliminates internal pores in the material, stably generating a high-purity superconducting phase, and significantly improving the current-carrying capacity of Bi-based high-temperature superconducting wires and strips. This makes it suitable for the research and development and large-scale preparation of Bi-based high-temperature superconducting materials in China.

Description

Technical Field

[0001] This invention belongs to the technical field of high-temperature superconducting material preparation equipment, specifically relating to a high-pressure, high-oxygen atmosphere hot isostatic pressing furnace and its method for processing superconducting wires and strips. Background Technology

[0002] During the preparation of Bi-based high-temperature superconducting wires and strips (such as Bi-2212 and Bi-2223), numerous pores form internally, severely limiting their current-carrying capacity. Research indicates that hot isostatic pressing (HIP) under high-pressure, high-oxygen atmosphere can eliminate these pores and ensure the formation of a high-purity superconducting phase, significantly improving current-carrying capacity. Currently, existing commercial HIP equipment suffers from extremely high downtime rates under the combined effects of high temperature, high pressure, and high oxygen conditions. The core issue lies in the heating element's prolonged direct contact with the high-pressure, high-oxygen corrosive atmosphere, leading to rapid oxidation and burnout of the heating element under high-temperature conditions (the furnace wire temperature is 200°C higher than the furnace body temperature), resulting in batch sample scrapping and a surge in equipment maintenance costs. Conventional HIP furnaces without high-oxygen conditions operate stably with low failure rates, clearly demonstrating that the high-pressure, high-oxygen atmosphere is the primary cause of the short lifespan and poor reliability of existing equipment. The industry has long lacked a structurally sound, long-term stable HIP furnace adapted to high-oxygen, high-pressure, and high-temperature conditions, hindering the advancement of domestic Bi-based superconducting material research and preparation.

[0003] Therefore, there is a need for a high-pressure, high-oxygen atmosphere hot isostatic pressing furnace and a method for processing superconducting wires and strips. Summary of the Invention

[0004] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a high-pressure, high-oxygen atmosphere hot isostatic pressing furnace. This hot isostatic pressing furnace, through a dual-cavity pressure-splitting isolation structure, fundamentally isolates the heating element from contact with the high-pressure, high-oxygen atmosphere, ensuring long-term stable operation of the equipment and solving the common industry technical problems of high failure rate, high scrap rate, and short service life caused by oxidation and burnout of furnace wires in existing equipment.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a high-pressure high-oxygen atmosphere thermal isostatic pressing furnace, characterized in that the high-pressure high-oxygen atmosphere thermal isostatic pressing furnace includes an outer high-pressure component filled with high-pressure inert gas, an inner high-pressure component for containing samples and filled with high-pressure high-oxygen atmosphere is provided in the outer high-pressure component, the outer high-pressure component and the inner high-pressure component are separated by a high-temperature alloy isolation cover, a heating element is provided outside the high-temperature alloy isolation cover, and both the outer high-pressure component and the inner high-pressure component are connected to a pressure control component.

[0006] The above-mentioned high-pressure, high-oxygen atmosphere hot isostatic pressing furnace is characterized in that the outer high-pressure component includes a shell, and a water-cooled shell is further provided outside the shell.

[0007] The above-mentioned high-pressure, high-oxygen atmosphere hot isostatic pressing furnace is characterized in that the high-temperature alloy isolation cover includes a high-temperature section and a low-temperature section connected by welding, a heating element is provided outside the high-temperature section, the low-temperature section is sealed and welded to the outer shell, the high-temperature section is made of high-temperature alloy, and the low-temperature section is made of pressure vessel steel.

[0008] The above-mentioned high-pressure, high-oxygen atmosphere hot isostatic pressing furnace is characterized in that the high-temperature alloy is selected from the GH series alloys.

[0009] The above-mentioned high-pressure, high-oxygen atmosphere hot isostatic pressing furnace is characterized in that the inner high-pressure component includes a high-pressure cover that is sealed to the outer shell and seals the high-temperature alloy isolation cover, and a high-pressure rubber sealing ring is provided at the sealing connection between the high-pressure cover and the outer shell. The inner high-pressure component also includes a sample stage disposed inside the high-temperature alloy isolation cover.

[0010] The above-mentioned high-pressure, high-oxygen atmosphere hot isostatic pressing furnace is characterized in that a top heat insulation layer is provided on the upper part of the high-temperature alloy insulation cover, the top heat insulation layer includes a metal support and a heat insulation material filled in the metal support, the heat insulation material includes aluminum silicate and / or asbestos, and a lifting ring is also provided on the upper part of the metal support.

[0011] The above-mentioned high-pressure, high-oxygen atmosphere hot isostatic pressing furnace is characterized in that the heating element is an iron-chromium-aluminum heating element, and an insulating frame is provided between the heating element and the high-temperature alloy isolation cover, the insulating frame including ceramic pads.

[0012] The above-mentioned high-pressure, high-oxygen atmosphere hot isostatic pressing furnace is characterized in that the heating element is wrapped with an insulation layer, the material of which includes aluminum silicate and / or asbestos.

[0013] The aforementioned high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace is characterized in that the pressure control component includes an outer layer inlet pipe and an outer layer outlet pipe extending into the outer high-pressure component. An outer layer inlet pressure control valve is installed on the outer layer inlet pipe, and an outer layer pressure sensor and an outer layer outlet pressure control valve are installed on the outer layer outlet pipe. The pressure control component also includes an inner layer inlet pipe and an inner layer outlet pipe extending into the inner high-pressure component. An inner layer inlet pressure control valve is installed on the inner layer inlet pipe, and an inner layer pressure sensor and an inner layer outlet pressure control valve are installed on the inner layer outlet pipe. The pressure control component controls the pressure difference between the interior of the outer high-pressure component and the interior of the inner high-pressure component to be no greater than 1%.

[0014] In addition, this invention discloses a method for treating superconducting wires and strips using a high-pressure, high-oxygen atmosphere hot isostatic pressing furnace. The method is characterized by the following steps: placing Bi-based high-temperature superconducting wires and strips on a sample stage, then sealing the high-pressure, high-oxygen atmosphere hot isostatic pressing furnace, then filling the outer high-pressure component with high-pressure inert gas and increasing the pressure, filling the inner high-pressure component with high-pressure, high-oxygen atmosphere and increasing the pressure, while maintaining the pressure difference between the inside and outside not greater than 1%, and simultaneously starting the heating element to raise the temperature, and performing hot isostatic pressing treatment on the Bi-based high-temperature superconducting wires and strips under high-temperature, high-pressure, high-oxygen atmosphere.

[0015] Compared with the prior art, the present invention has the following advantages: 1. This invention provides a long-life high-oxygen thermal isostatic pressing furnace in which the heating element does not directly contact the high-oxygen and high-pressure atmosphere. Through a dual-cavity pressure-splitting isolation structure, the heating element is isolated from the high-pressure and high-oxygen atmosphere from the source, ensuring long-term stable operation of the equipment and solving the common technical problems in the industry of high failure rate, high scrap rate and short service life caused by oxidation and burnout of furnace wires in existing equipment.

[0016] 2. The high-pressure, high-oxygen atmosphere hot isostatic pressing furnace of the present invention has a clear functional division and independent pressure control of the dual high-pressure system, with minimal internal and external pressure difference. The high-temperature alloy isolation cover does not need to bear the high pressure differential load, but only undertakes the functions of atmosphere isolation and temperature equalization. It abandons the traditional thick-walled pressure-bearing design, greatly reducing the material cost and processing and manufacturing difficulty of the equipment. The overall structure of the equipment has a high degree of matching, and the components work together stably.

[0017] 3. The heating element of this invention is kept inside the outer inert atmosphere throughout the process, completely isolating it from the high oxygen corrosion environment. This solves the problem of high-temperature oxidation and burnout of the heating element from the root, avoids the problem of heating element burnout, reduces the failure downtime rate and sample scrap rate, and fully meets the long-term stable treatment requirements of high oxygen thermostatic pressing for Bi-based high-temperature superconducting wires and strips.

[0018] 4. The high-temperature section of the high-temperature alloy isolation cover of the present invention is a GH series alloy, which is a nickel-rich matrix. Under an oxidizing atmosphere, it will form a dense Cr2O3. This oxide film is denser and more stable than the alumina film formed by iron, chromium and aluminum, and is not easy to peel off. Therefore, its oxidation resistance is at least one order of magnitude higher. In addition, the high-temperature alloy isolation cover is at a certain distance from the heating element, and the temperature of the isolation cover is more than 200°C lower than the temperature of the heating element. This further reduces the oxidation problem of the high-temperature alloy isolation cover, thereby significantly reducing the equipment downtime rate and the sample scrap rate.

[0019] 5. The high-temperature alloy isolation cover of the present invention features segmented and differentiated material selection, which takes into account both the requirements of high temperature, high pressure and high oxygen conditions and the equipment manufacturing cost. Furthermore, the high-temperature alloy isolation cover has the dual functions of atmosphere barrier and temperature uniformity, which effectively improves the uniformity of the temperature field inside the furnace, ensures the consistency of heat treatment of batch Bi-based high-temperature superconducting wires and strips, and improves the overall performance of the product.

[0020] 6. This invention adopts a sealing structure of high-pressure cover and high-pressure rubber sealing ring, which is convenient to disassemble and assemble, suitable for frequent sample handling, and highly practical.

[0021] 7. This invention performs hot isostatic pressing on Bi-based high-temperature superconducting wires and strips, effectively eliminating internal pores in the material, stably generating a high-purity superconducting phase, significantly improving the current-carrying capacity of Bi-based high-temperature superconducting wires and strips, and making it suitable for the research and development and large-scale preparation of Bi-based high-temperature superconducting materials.

[0022] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace of the present invention.

[0024] Explanation of reference numerals in the attached figures: Detailed Implementation

[0025] The high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace of the present invention is described in detail through Example 1.

[0026] Example 1 like Figure 1 As shown, a high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace of this embodiment includes an outer high-pressure component filled with high-pressure inert gas, and an inner high-pressure component for containing samples and filled with high-pressure, high-oxygen atmosphere. The outer high-pressure component and the inner high-pressure component are separated by a high-temperature alloy isolation cover 1. A heating element 2 is provided outside the high-temperature alloy isolation cover 1. Both the outer high-pressure component and the inner high-pressure component are connected to a pressure control component.

[0027] It should be noted that the core of the high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace adopts a nested dual independent high-pressure system structure design, mainly composed of an outer high-pressure component, an inner high-pressure component, a high-temperature alloy isolation cover 1, a heating element 2, and a pressure control component. The outer high-pressure component is filled with high-pressure inert gas, while the inner high-pressure component is nested inside the outer high-pressure component, used to hold the sample to be processed and filled with a high-pressure, high-oxygen atmosphere. The heating element 2 is entirely positioned outside the high-temperature alloy isolation cover 1. In other words, within the inert atmosphere environment inside the outer high-pressure component and outside the inner high-pressure component, it does not come into contact with the high-oxygen medium throughout the process. Furthermore, the high-temperature alloy isolation cover 1 is located inside the outer high-pressure component. Between the two outer high-pressure systems, the core atmosphere isolation component completely separates the outer inert high-pressure atmosphere from the inner high-oxygen high-pressure atmosphere, while also serving as a furnace temperature equalization component. The pressure control component is used to fill the outer high-pressure component and the inner high-pressure component with high-pressure inert gas and high-pressure high-oxygen atmosphere, respectively. Through precise linkage control, the pressure difference between the inner and outer high-pressure components is not greater than 1%, so that the high-temperature alloy isolation cover 1 basically does not bear positive or negative pressure difference loads and is used only as an atmosphere barrier and temperature equalization component. It does not require a high-strength pressure-bearing design, which greatly reduces the manufacturing difficulty and material cost, and ensures the stable operation of the high-pressure high-oxygen atmosphere hot isostatic pressing furnace.

[0028] like Figure 1 As shown, in this embodiment, the outer high-pressure component includes a housing 3, and a water-cooled shell 4 is also provided outside the housing 3. The housing 3 bears pressure to maintain the inert high-pressure atmosphere inside, and the water-cooled shell 4 provides water cooling and heat dissipation protection for the entire high-pressure, high-oxygen atmosphere hot isostatic pressing furnace, allowing for real-time monitoring of the temperature rise of the housing 3 and avoiding equipment safety risks caused by high temperatures; moreover, the design pressure of the housing 3 can reach up to 200MPa, which fully meets the requirements for processing superconducting wires and strips.

[0029] It should be noted that the water-cooled housing 4 is equipped with a water-cooling circulation system.

[0030] like Figure 1As shown, in this embodiment, the high-temperature alloy insulation cover 1 includes a high-temperature section and a low-temperature section connected by welding. A heating element 2 is disposed outside the high-temperature section, and the low-temperature section is sealed and welded to the outer shell 3. The high-temperature section is made of high-temperature alloy, and the low-temperature section is made of pressure vessel steel. The section of the high-temperature alloy insulation cover 1 with the heating element 2 evenly arranged around it is the high-temperature section, located at the bottom of the high-temperature alloy insulation cover 1. The section without the heating element 2 is the low-temperature section. The high-temperature section withstands harsh conditions of high temperature, high pressure, and high oxygen for extended periods and is made of a high-temperature and corrosion-resistant high-temperature alloy. The low-temperature section only withstands low-temperature and high-pressure conditions and is made of conventional pressure vessel steel to reduce costs. The high-temperature section and the low-temperature section are firmly connected by welding, and a heat insulation layer is provided to block heat conduction. The low-temperature section of the high-temperature alloy insulation cover 1 is sealed and welded to the outer shell 3, forming a closed area, namely the outer high-pressure cavity 23, which is filled with high-pressure inert gas to serve as an outer inert atmosphere pressure-bearing working space.

[0031] In this embodiment, the high-temperature alloy is selected from the GH series alloys, preferably GH3128, GH3536 and GH5605, all of which have the effect of resisting high temperature and oxidation.

[0032] like Figure 1 As shown, in this embodiment, the inner high-pressure assembly includes a high-pressure cover 5 that is sealed to the outer shell 3 and seals the high-temperature alloy isolation cover 1. A high-pressure rubber sealing ring 6 is provided at the sealing connection between the high-pressure cover 5 and the outer shell 3. The inner high-pressure assembly also includes a sample stage 7 disposed inside the high-temperature alloy isolation cover 1. The high-pressure cover 5, part of the outer shell 3, and the high-temperature alloy isolation cover 1 form a closed area, namely the inner high-pressure cavity 24, which is used to fill the cavity with a high-oxygen and high-pressure atmosphere, serving as a pressure-bearing working space for the inner high-pressure and high-oxygen atmosphere. By setting the high-pressure rubber sealing ring 6, a reliable sealing structure is formed, which can be repeatedly opened, closed, disassembled, and assembled, facilitating sample handling and the sealed pressure-bearing operation of the equipment. The sample stage 7 is provided for stable placement of samples.

[0033] like Figure 1 As shown, in this embodiment, a top heat insulation layer is provided on the upper part of the high-temperature alloy insulation cover 1. The top heat insulation layer includes a metal support 8 and insulation material 9 filled in the metal support 8. The insulation material 9 includes aluminum silicate and / or asbestos. A lifting ring 10 is also provided on the upper part of the metal support 8. By setting the top heat insulation layer, the upward conduction of high temperature inside the furnace is blocked, protecting the top seal and pipeline components.

[0034] It should be noted that the weld between the high-temperature alloy insulation cover 1 and the outer shell 3 is stepped, which is used for the mounting of the metal support 8, so that the top heat insulation layer is located on the top of the high-temperature alloy insulation cover 1. When it is necessary to put in or take out the sample, the top heat insulation layer can be removed through the lifting ring 10.

[0035] like Figure 1As shown, in this embodiment, the heating element 2 is an iron-chromium-aluminum heating element 2. An insulating frame is provided between the heating element 2 and the high-temperature alloy isolation cover 1. The insulating frame includes ceramic pads 11. The heating elements 2 are evenly arranged around the high-temperature section of the high-temperature alloy isolation cover 1. The ceramic pads 11 between the heating elements 2 and the high-temperature alloy isolation cover 1 achieve insulation and isolation protection, eliminating the safety hazard of leakage.

[0036] like Figure 1 As shown, in this embodiment, the heating element 2 is wrapped with a heat insulation layer 12, the material of which includes aluminum silicate and / or asbestos. The heat insulation layer 12 effectively reduces heat transfer to the outer high-voltage components.

[0037] It should be noted that the thickness of the insulation layer 12 is 20mm~50mm, preferably 20mm, 35mm and 50mm.

[0038] like Figure 1 As shown, in this embodiment, the pressure control component includes an outer air inlet pipe 13 and an outer air outlet pipe 14 extending into the outer high-pressure component. An outer inlet pressure control valve 15 is provided on the outer air inlet pipe 13, and an outer pressure sensor 16 and an outer outlet pressure control valve 17 are provided on the outer air outlet pipe 14. The pressure control component also includes an inner air inlet pipe 18 and an inner air outlet pipe 19 extending into the inner high-pressure component. An inner inlet pressure control valve 20 is provided on the inner air inlet pipe 18, and an inner pressure sensor 21 and an inner outlet pressure control valve 22 are provided on the inner air outlet pipe 19. The pressure control component controls the pressure difference between the interior of the outer high-pressure component and the interior of the inner high-pressure component to be no greater than 1%. The outer high-pressure inert gas is pressurized by the outer air inlet pipe 13 and the outer inlet pressure control valve 15, and the pressure data inside the outer high-pressure chamber 23 is collected in real time by the outer pressure sensor 16. The inner high-pressure oxygen atmosphere is pressurized by the inner air inlet pipe 18 and the inner inlet pressure control valve 20, and the pressure data of the inner high-pressure chamber 24 is collected in real time by the inner pressure sensor 21. The pressure relief and pressure regulation operation is completed in concert by the outer air outlet pipe 14, the outer outlet pressure control valve 17, the inner air outlet pipe 19, and the inner outlet pressure control valve 22.

[0039] It should be noted that the heating element 2, water-cooled shell 4, outer inlet pressure control valve 15, outer pressure sensor 16, outer outlet pressure control valve 17, inner inlet pressure control valve 20, inner pressure sensor 21, and inner outlet pressure control valve 22 are all connected to the PLC controller. The PLC controller centrally manages and controls the heating temperature, shell temperature 3, atmosphere and pressure inside the outer high-pressure chamber 23 and inner high-pressure chamber 24, ensuring that the pressure difference is no greater than 1%. The PLC controller used is a Siemens S7-1500 model.

[0040] The present invention describes in detail a method for processing superconducting wire strips using a high-pressure, high-oxygen atmosphere hot isostatic pressing furnace, through Example 2.

[0041] Example 2 This embodiment includes the following steps: First, place Bi-based high-temperature superconducting wire strips on the sample stage 7. Then, seal the high-pressure, high-oxygen atmosphere hot isostatic pressing furnace and start the water-cooled circulation system of the water-cooled shell 4 to ensure the safe operation of the equipment shell 3 at low temperatures throughout the process. Subsequently, open the outer layer inlet pressure control valve 15 and fill the outer layer high-pressure chamber 23 with high-pressure argon gas through the outer layer air inlet pipe 13, simultaneously increasing the pressure to 5MPa. At the same time, start the heating element 2 to gradually raise the temperature to 900℃. After the outer layer pressure and temperature stabilize, open the inner layer inlet pressure control valve 20 and fill the inner layer high-pressure component with a high-pressure, high-oxygen mixture containing 2% oxygen and the remainder argon gas through the inner layer air inlet pipe 18, simultaneously increasing the pressure to 5MPa. Pressurize to 5MPa and adjust the pressure in real time to ensure that the pressure difference between the outer high-pressure chamber 23 and the inner high-pressure chamber 24 is not greater than 1%. At this time, the high-temperature alloy isolation cover 1 has no additional pressure difference load and only plays the role of atmosphere isolation and furnace temperature equalization. Maintain a high-pressure and high-oxygen atmosphere of 900℃ and 5MPa to perform hot isostatic pressing constant temperature and pressure treatment on the Bi-based high-temperature superconducting wire and strip. After the treatment is completed, slowly release the pressure and cool down through the outer outlet pressure control valve 17 and the inner outlet pressure control valve 22 in conjunction with the outer outlet pipe 14 and the inner outlet pipe 19. Open the high-pressure cover 5, lift out the top heat insulation layer, and the processed Bi-based high-temperature superconducting wire and strip can be taken out.

[0042] Testing revealed that the diameter reduction rate of the processed Bi-based high-temperature superconducting wire and strip reached 5%, and the thickness of the Bi-based strip was reduced by 4.5%. Metallographic and SEM analyses showed that the pores that appeared during the atmospheric pressure heat treatment completely disappeared.

[0043] The high-pressure, high-oxygen atmosphere hot isostatic press furnace of this embodiment did not experience any furnace wire burnout problem after 20 furnace runs. This is a significant improvement over conventional hot isostatic press furnaces, where furnace wire burnout occurs after 3 to 5 furnace runs of furnace wires directly in contact with high-oxygen, high-pressure gas.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the inventive essence shall still fall within the protection scope of the present invention.

Claims

1. A high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace, characterized in that, The high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace includes an outer high-pressure component filled with high-pressure inert gas, and an inner high-pressure component for containing samples and filled with high-pressure, high-oxygen atmosphere. The outer and inner high-pressure components are separated by a high-temperature alloy isolation cover (1). A heating element (2) is provided outside the high-temperature alloy isolation cover (1). Both the outer and inner high-pressure components are connected to a pressure control component.

2. The high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace according to claim 1, characterized in that, The outer high-voltage component includes a housing (3), and a water-cooled housing (4) is also provided outside the housing (3).

3. The high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace according to claim 2, characterized in that, The high-temperature alloy insulation cover (1) includes a high-temperature section and a low-temperature section connected by welding. A heating element (2) is provided outside the high-temperature section. The low-temperature section is sealed and welded to the outer shell (3). The high-temperature section is made of high-temperature alloy and the low-temperature section is made of pressure vessel steel.

4. The high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace according to claim 3, characterized in that, The high-temperature alloy is selected from the GH series alloys.

5. The high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace according to claim 2, characterized in that, The inner high-pressure assembly includes a high-pressure cover (5) that is sealed to the outer shell (3) and seals the high-temperature alloy isolation cover (1). A high-pressure rubber sealing ring (6) is provided at the sealing connection between the high-pressure cover (5) and the outer shell (3). The inner high-pressure assembly also includes a sample stage (7) disposed inside the high-temperature alloy isolation cover (1).

6. The high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace according to claim 1, characterized in that, The high-temperature alloy insulation cover (1) is provided with a top heat insulation layer, which includes a metal bracket (8) and a heat insulation material (9) filled in the metal bracket (8). The heat insulation material (9) includes aluminum silicate and / or asbestos. The metal bracket (8) is also provided with a hanging ring (10).

7. The high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace according to claim 1, characterized in that, The heating element (2) is an iron-chromium-aluminum heating element (2), and an insulating frame is provided between the heating element (2) and the high-temperature alloy insulation cover (1), the insulating frame including ceramic pads (11).

8. The high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace according to claim 1, characterized in that, The heating element (2) is wrapped with an insulation layer (12), the insulation layer (12) being made of aluminum silicate and / or asbestos.

9. The high-pressure, high-oxygen atmosphere thermal isostatic pressing furnace according to claim 1, characterized in that, The pressure control assembly includes an outer air inlet pipe (13) and an outer air outlet pipe (14) extending into the outer high-pressure assembly. An outer inlet pressure control valve (15) is provided on the outer air inlet pipe (13), and an outer pressure sensor (16) and an outer outlet pressure control valve (17) are provided on the outer air outlet pipe (14). The pressure control assembly also includes an inner air inlet pipe (18) and an inner air outlet pipe (19) extending into the inner high-pressure assembly. An inner inlet pressure control valve (20) is provided on the inner air inlet pipe (18), and an inner pressure sensor (21) and an inner outlet pressure control valve (22) are provided on the inner air outlet pipe (19). The pressure control assembly controls the pressure difference between the interior of the outer high-pressure assembly and the interior of the inner high-pressure assembly to be no greater than 1%.

10. A method for processing superconducting wire strips using a high-pressure, high-oxygen atmosphere hot isostatic pressing furnace as described in any one of claims 1 to 9, characterized in that, The method includes the following steps: placing Bi-based high-temperature superconducting wire and tape on the sample stage (7), then sealing the high-pressure high-oxygen atmosphere hot isostatic pressing furnace, then filling the outer high-pressure component with high-pressure inert gas and increasing the pressure, filling the inner high-pressure component with high-pressure high-oxygen atmosphere and increasing the pressure, and keeping the pressure difference between the inside and outside not greater than 1%, while starting the heating element (2) to raise the temperature, and performing hot isostatic pressing on the Bi-based high-temperature superconducting wire and tape under high-temperature, high-pressure, and high-oxygen atmosphere.

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