Is it necessary to use vacuum hot press furnace for sintering high temperature superconducting materials?
Release time:
2025-06-27
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Abstract
The preparation of warm superconducting materials is a complex and multistep process, in which sintering is an important part of the process to increase the density, improve the microstructure and enhance the superconducting properties of the materials. Whether a vacuum hot press furnace must be used in the sintering process depends on the specific material type, the expected material properties, and the process requirements.
Firstly, the vacuum hot press furnace has unique advantages in the preparation of high-temperature superconducting materials. It can exclude impurity gases such as oxygen while applying pressure at high temperatures, thereby reducing oxygen vacancy defects in oxide high-temperature superconducting materials and contributing to the formation of purer and denser microstructures. In addition, by controlling the temperature and pressure parameters, the grain growth and orientation of the material can be precisely regulated, which is essential for optimising the superconducting properties.
However, not all high-temperature superconducting material preparations require sintering using a vacuum hot press furnace. For example, for some high-temperature superconductors based on copper oxides, conventional solid-phase reaction methods or melt-weave growth methods may be sufficient. These methods do not require complex equipment conditions and can achieve certain performance specifications. In addition, there are some research attempts to use novel sintering techniques, such as microwave sintering, discharge plasma sintering (SPS), etc., which are even more efficient or can provide better material properties than vacuum hot press furnace in some aspects.
In summary, although the vacuum hot press furnace provides a superior environment for sintering high-temperature superconducting materials, which is conducive to improving material quality and properties, it is not the only choice. The specific choice of which sintering method needs to be considered according to the actual material requirements, cost budget and equipment conditions. With the development of new materials and processes, more efficient sintering technologies suitable for high-temperature superconducting material preparation may appear in the future.
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