‘Beautiful’ unconventional synthesis and processing technologies of superconductors and some other materials

Badica, P.; Crisan, A.; Aldica, G.; Endo, Kazuhiko; Borodianska, Hanna; Togano, K.; Awaji, Satoshi; Watanabe, Kazuo; Sakka, Yoshio; Vasylkiv, Oleg

doi:10.1088/1468-6996/12/1/013001

Cited by 31 publications

(16 citation statements)

References 48 publications

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“…The initial idea of using rolling electrodes started much earlier with the work from Raitchenko (in Russia) as reviewed in the work of Badica et al [55].…”

Section: Experimental Configurations For Fsmentioning

confidence: 99%

“…Compared to a previous study employing an AC power source, Zhang and Luo [96] obtained cylinder ZnO specimens with a relative density of >97% TD and fine grain sizes of ∼1 µm using the FS setup shown in Figure 4 (b) (DC, discharge time ∼30 s, T F < 120°C, atmosphere Ar + 5 mol-% H 2 ). Bi 2 O 3 doping was applied to eliminate the anode-side abnormal grain growth via a liquidphase sintering effect, resulting in ZnO with a more homogenous microstructures [55].…”

Section: Fs Of Insulators and Semiconductorsmentioning

confidence: 99%

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Review of flash sintering: materials, mechanisms and modelling

Grasso

McKinnon

et al. 2016

Advances in Applied Ceramics

401

248

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Flash sintering (FS) is an energy efficient sintering technique involving electrical Joule heating, which allows very rapid densification (<60 s) of particulate materials. Since the first publication on flash-sintered zirconia (3YSZ) in 2010, it has been intensively researched and applied to a wide range of materials. Going back more than a century ago, we have found a close similarity between FS of oxides and Nernst glowers developed in 1897. This review provides a comprehensive overview of FS and is based on a literature survey consisting of 88 papers and seven patents. It correlates processing parameters (i.e. electric field magnitude, current density, waveforms (AC, DC) and frequency, furnace temperature, electrode materials/ configuration, externally applied pressure and sintering atmosphere) with microstructures and densification mechanisms. Theorised mechanisms driving the rapid densification are substantiated by modelling work, advanced in situ analysis techniques and by established theories applied to electric current assisted/activated sintering techniques. The possibility of applying FS to a wider range of materials and its implementation in industrial scale processes are discussed.

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“…The initial idea of using rolling electrodes started much earlier with the work from Raitchenko (in Russia) as reviewed in the work of Badica et al [55].…”

Section: Experimental Configurations For Fsmentioning

confidence: 99%

Section: Fs Of Insulators and Semiconductorsmentioning

confidence: 99%

Review of flash sintering: materials, mechanisms and modelling

Grasso

McKinnon

et al. 2016

Advances in Applied Ceramics

401

248

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“…Therefore, the fabrication of nanometer-scale objects is undoubtedly one of the central issues in current science and technology. [1][2][3][4] There have been new developments and innovative ideas in the area of nanostructured materials processing which have had the most profound and wide-ranging impacts on satisfying the growing and challenging demands for better performed and cheaper products in various fields. [5][6][7][8] Nanostructured ceramic materials have demonstrated superior performance and are capable of meeting the requirements of structural materials for wide applications.…”

Section: Introductionmentioning

confidence: 99%

Densification Kinetics of Nanocrystalline Zirconia Powder Using Microwave and Spark Plasma Sintering—A Comparative Study

Vasylkiv

Demirskyi

Sakka

et al. 2012

j. nanosci. nanotech.

Self Cite

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Two-stage densification process of nanosized 3 mol% yttria-stabilized zirconia (3Y-SZ) polycrystalline compacts during consolidation via microwave and spark-plasma sintering have been observed. The values of activation energies obtained for microwave and spark-plasma sintering 260-275 kJ x mol(-1) are quite similar to that of conventional sintering of zirconia, suggesting that densification during initial stage is controlled by the grain-boundary diffusion mechanism. The sintering behavior during microwave sintering was significantly affected by preliminary pressing conditions, as the surface diffusion mechanism (230 kJ x mol(-1)) is active in case of cold-isostatic pressing procedure was applied.

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“…[22] The polymer chains have plenty of amido bonds, and they can form sufficient strong and reversible hydrogen bonds, which are responsible for the self-healing ability. [3,4] The actual used superconductors are still metals and metal alloys for their easy process ability, such as NbTi (T c = 9 K) and Nb 3 Sn (T c = 18 K). The mechanical performance of the resultant samples has been measured and compared with the original states as shown in Figure 2b.…”

mentioning

confidence: 99%

Self‐Healing and Shape‐Memory Superconducting Devices

Zang

Fang

et al. 2019

Macro Materials & Eng

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technology is still limited to the traditional metal processing until now, while the modern high-tech materials are developing toward intelligence and multiple functions. Hence, except to keep looking for possible industrialized technologies of HTS, more attention is needed for developing novel SC technologies on conventional superconductors in response to an increasingly smart applying requirement of superconductivity.Under such circumstances here we endow SC devices with smart selfhealing [16,17] and shape-memory [18,19] features as the beginning of an attempt, and the operation processes are shown in Figure 1. An integrated system using a liquid metal (Ga 92 Sn 8 ) as the SC material [20,21] and self-healing/shapememory polymer as packaging materials has been designed. To match up the temperature required for self-healing and shape memory, the melting point of the liquid metal is optimized as almost 30 °C, which is lower than the self-healing or the shape-memory temperature of those polymers. Concretely, as for the self-healing device, the metal can melt into a liquid state when heated above 50 °C and the cutting-off polymer will heal itself at the same time. In the shape memory system, the polymer will recover its permanent shape at a temperature of 80 °C, at which the liquid metal is melted and flexible enough for shape changing. Both integrated systems will recover its solid state after cooling. The real image of the self-healing polymer is shown in Figure 2a and the chemical structure of the polymer is also schematically illustrated. [22] The polymer chains have plenty of amido bonds, and they can form sufficient strong and reversible hydrogen bonds, which are responsible for the self-healing ability. The self-healing properties are evaluated at different temperature, by which the samples are cut into two parts first and then healed within 5 min. The mechanical performance of the resultant samples has been measured and compared with the original states as shown in Figure 2b. It is clear that the tensile property can be partly healed at room temperature and completely healed as the temperature rises to 50 °C. Figure 2c demonstrates the real cutting and healing process of the polymer. As you can see, the two broken parts are able to heal as a whole.The obtained epoxy-amine shape memory polymer (EASMP) is shown in Figure 3b, which is fabricated by a ring-opening polymerization method and the specific chemical reaction formulation is presented in Figure 3a. [23] The hydrogen atom on the amine group can serve as a crosslinking site. The excess unreacted amines in the formulation lead to the reduction of the crosslinking density, which can regulate the glass transition temperature (T g ). In this work, T g of the polymer is around 60 °C, Intelligent materials possess the function of self-judgment and self-optimization while sensing external stimuli such as stress, temperature, moisture, pH, electric or magnetic fields, or light. Besides, they often require self-healingthe ability to repair damage spontaneously-o...

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‘Beautiful’ unconventional synthesis and processing technologies of superconductors and some other materials

Cited by 31 publications

References 48 publications

Review of flash sintering: materials, mechanisms and modelling

Review of flash sintering: materials, mechanisms and modelling

Densification Kinetics of Nanocrystalline Zirconia Powder Using Microwave and Spark Plasma Sintering—A Comparative Study

Self‐Healing and Shape‐Memory Superconducting Devices

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