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The ultra-light YBCO superconducting block prepared by Professor Zhou Youhe’s team from the School of Civil Engineering and Mechanics of Lanzhou University not only has the excellent characteristics of complex structure and high superconductivity, but its critical current density has also increased to that of traditional cold-pressed sintered samples.
3.
15 times, its density value is also the lowest in the world
.
? Imagine if the ice cream cone you hold in your hand melts, and there is a hole in the bottom of the cone shell, and the ice cream is allowed to drip down, what will happen? The reporter of Science and Technology Daily learned from Lanzhou University on May 23 that the team of Professor Zhou Youhe of the School of Civil Engineering and Mechanics of the school solved an international problem in the preparation of controllable superconducting materials with such an "ice cream" design
.
Relevant results were recently published in the internationally renowned journal "Advanced Functional Materials"
.
? In this "ice cream", the device similar to the shell of the cone is called a 3D printing nozzle, and the "cone" is filled with YBCO (yttrium-barium-copper-oxygen high-temperature superconductor) superconducting bulk materials that have been proportioned several times.
Slurry
.
Under the control of the program designed by the team, the slurry drips freely from the nozzle, and superconducting samples with complex shapes can be printed out according to the established "route"
.
? For a long time, high-temperature superconducting YBCO bulk materials have shown good application prospects in non-contact magnetic levitation, energy storage rotating machinery, and quasi-permanent magnets due to their high critical temperature, high critical current density and high trapping magnetic field
.
However, due to the inherent brittleness of YBCO oxide ceramics, the raw material for preparing YBCO bulk materials, and the mechanical stress caused by temperature changes during the high-temperature sintering process, the traditional cold-pressed sintering preparation cannot achieve various shapes and structures.
Preparation and shaping requirements
.
? "The inherent brittleness of superconducting materials greatly restricts the mechanical properties of superconducting applications, and its superconductivity and mechanical properties are a big contradiction.
It is recommended that Lanzhou University tackle toughening and modification
.
" In 2015, held in Zhejiang University At the Innovation Research Group Exchange Meeting of the National Foundation of Solid Mechanics, Academician Yang Wei, then director of the National Natural Science Foundation of China, learned that Zhou Youhe's team had been paying attention to this field for a long time, and had an in-depth discussion with Zhou Youhe on future research directions
.
? After nearly 5 years of hard work, Zhou You and his team successfully explored high-precision direct writing (DIW) 3D printing technology, adopted low-temperature cold-casting microstructure control strategy, and further overcome the problem of YBCO bulk sintering shrinkage and cracking.
The shrinkage rate of YBCO is reduced from the traditional 50% to almost no shrinkage, laying the foundation for the high-precision preparation of YBCO superconducting blocks
.
? The ultra-lightweight YBCO superconducting block prepared by the team not only has the excellent characteristics of complex structure and high superconductivity, but also increased the critical current density of the YBCO block to 3.
15 times that of the traditional cold-pressed sintered sample, and its density value is also It is currently the lowest in the world, about 1/3 of the samples prepared by the traditional cold pressing sintering process
.
At the same time, the porous structure of the material also lays the foundation for the subsequent reduction of oxygen supplementation time, and its preparation efficiency is greatly improved
.
? Centimeter-scale superconducting bulk materials prepared by the 3D printing equipment, such as a 3D lattice structure with a specific structure, can be applied to high-temperature superconducting filters to provide better services for 5G communications and military equipment
.
The superconducting flywheel prepared by the 3D printing equipment realizes the suspension and rotation of the aerospace gyro flywheel at the temperature of liquid nitrogen, laying the foundation for engineering applications
.
Zhou Youhe said that the next step the team will focus on the toughening modification of superconducting materials, is committed to realizing the strengthening and toughening of superconducting bulk materials, thereby achieving ease of processing, and further increasing the critical current of samples prepared by 3D printing.
It lays a solid foundation for the controllable equipment and future applications of ultra-light YBCO superconducting blocks
.
3.
15 times, its density value is also the lowest in the world
.
? Imagine if the ice cream cone you hold in your hand melts, and there is a hole in the bottom of the cone shell, and the ice cream is allowed to drip down, what will happen? The reporter of Science and Technology Daily learned from Lanzhou University on May 23 that the team of Professor Zhou Youhe of the School of Civil Engineering and Mechanics of the school solved an international problem in the preparation of controllable superconducting materials with such an "ice cream" design
.
Relevant results were recently published in the internationally renowned journal "Advanced Functional Materials"
.
? In this "ice cream", the device similar to the shell of the cone is called a 3D printing nozzle, and the "cone" is filled with YBCO (yttrium-barium-copper-oxygen high-temperature superconductor) superconducting bulk materials that have been proportioned several times.
Slurry
.
Under the control of the program designed by the team, the slurry drips freely from the nozzle, and superconducting samples with complex shapes can be printed out according to the established "route"
.
? For a long time, high-temperature superconducting YBCO bulk materials have shown good application prospects in non-contact magnetic levitation, energy storage rotating machinery, and quasi-permanent magnets due to their high critical temperature, high critical current density and high trapping magnetic field
.
However, due to the inherent brittleness of YBCO oxide ceramics, the raw material for preparing YBCO bulk materials, and the mechanical stress caused by temperature changes during the high-temperature sintering process, the traditional cold-pressed sintering preparation cannot achieve various shapes and structures.
Preparation and shaping requirements
.
? "The inherent brittleness of superconducting materials greatly restricts the mechanical properties of superconducting applications, and its superconductivity and mechanical properties are a big contradiction.
It is recommended that Lanzhou University tackle toughening and modification
.
" In 2015, held in Zhejiang University At the Innovation Research Group Exchange Meeting of the National Foundation of Solid Mechanics, Academician Yang Wei, then director of the National Natural Science Foundation of China, learned that Zhou Youhe's team had been paying attention to this field for a long time, and had an in-depth discussion with Zhou Youhe on future research directions
.
? After nearly 5 years of hard work, Zhou You and his team successfully explored high-precision direct writing (DIW) 3D printing technology, adopted low-temperature cold-casting microstructure control strategy, and further overcome the problem of YBCO bulk sintering shrinkage and cracking.
The shrinkage rate of YBCO is reduced from the traditional 50% to almost no shrinkage, laying the foundation for the high-precision preparation of YBCO superconducting blocks
.
? The ultra-lightweight YBCO superconducting block prepared by the team not only has the excellent characteristics of complex structure and high superconductivity, but also increased the critical current density of the YBCO block to 3.
15 times that of the traditional cold-pressed sintered sample, and its density value is also It is currently the lowest in the world, about 1/3 of the samples prepared by the traditional cold pressing sintering process
.
At the same time, the porous structure of the material also lays the foundation for the subsequent reduction of oxygen supplementation time, and its preparation efficiency is greatly improved
.
? Centimeter-scale superconducting bulk materials prepared by the 3D printing equipment, such as a 3D lattice structure with a specific structure, can be applied to high-temperature superconducting filters to provide better services for 5G communications and military equipment
.
The superconducting flywheel prepared by the 3D printing equipment realizes the suspension and rotation of the aerospace gyro flywheel at the temperature of liquid nitrogen, laying the foundation for engineering applications
.
Zhou Youhe said that the next step the team will focus on the toughening modification of superconducting materials, is committed to realizing the strengthening and toughening of superconducting bulk materials, thereby achieving ease of processing, and further increasing the critical current of samples prepared by 3D printing.
It lays a solid foundation for the controllable equipment and future applications of ultra-light YBCO superconducting blocks
.
