Influence of the powder calcination temperature on the microstructure in Bi(Pb)-2223 tapes

Bentzon, M.D.; Han, Z.; Andersen, L.O.; Goul, J.; Bodin, P.; Vase, P.

doi:10.1109/77.620835

Cited by 15 publications

(15 citation statements)

References 6 publications

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“…A green multifilament tape produced by the PIT method [6] was received from Nordic Superconductor Technologies A/S. The composition of the precursor powder was Bi 1.84, Pb 0.34, Sr 1.91, Ca 2.03 and Cu 3.06.…”

Section: Methodsmentioning

confidence: 99%

Microstructural evolution at the initial stages of annealing in a Bi-2223 multifilament tape

Liu¹,

Grivel²,

Wang³

et al. 2001

Supercond. Sci. Technol.

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The microstructural evolution at the initial stage of annealing in a multifilament Bi-2223Bi- (2223 tape is studied in quenched samples using XRD, SEM and EDS. The annealing was carried out at 830 • C under reduced oxygen partial pressure. Samples were quenched in air upon reaching 830 • C, as well as after 1, 2, 5, 10, 30 and 52 h at 830 • C. It was found that the initial liquid formation was associated with alkaline-earth cuprate (AEC) particles such as (Ca,Sr) 14 Cu 24 O z and (Ca,Sr) 2 CuO 3 . The liquid is rich of Pb and the AEC particles dissolve and supply Cu and Ca into the liquid through direct contact. The 2223 kinetics are well correlated with the structural parameters of liquid and AEC particles. During the first hour the liquid activity is confined to the neighbourhood of AEC particles and the rate of 2223 formation is very low. Between 2 and 10 h the liquid amount increases and the size (measured in tape plane) is comparable with the particle spacing indicating a liquid activity on an overall scale and sufficient feeding of Cu and Ca. Consequently, the 2223 develops at a fast rate. After 10 h the liquid amount is decreased, the particle spacing is far larger than the liquid size and the rate of 2223 formation slows down. The early 2223 forms as precipitates in the structure. The possible formation mechanisms are discussed.

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Section: Methodsmentioning

confidence: 99%

Microstructural evolution at the initial stages of annealing in a Bi-2223 multifilament tape

Liu¹,

Grivel²,

Wang³

et al. 2001

Supercond. Sci. Technol.

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“…Multifilament tapes are produced (Nordic Superconductor Technologies A/S, Birkerød, Denmark) using the Powder In Tube method 11 . The composition of the precursor powder is Bi 1.84, Pb 0.34, Sr 1.91, Ca 2.03, and Cu 3.06.…”

Section: Methodsmentioning

confidence: 99%

“…Multifilament tapes are produced (Nordic Superconductor Technologies A/S, Birker^d, Denmark) using the Powder In Tube method. 11 The composition of the precursor powder is Bi 1.84, Pb 0.34, Sr 1.91, Ca 2.03, and Cu 3.06. Different sections of the tape are quenched in air after, respectively, 0, 1, 2, and 5 h of annealing under an oxygen partial pressure of 8% at 8301C (0 h actually means that the sample is quenched immediately upon reaching 8301C).…”

Section: Methodsmentioning

confidence: 99%

Quantitative Electron Microscopy of (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+δ/Ag Multifilament Tapes During Initial Stages of Annealing

Bals

Verbeeck

Tendeloo

et al. 2005

Journal of the American Ceramic Society

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The microstructural and compositional evolution during initial annealing of a superconducting (Bi,Pb)2Sr2Ca2Cu3O10+δ/Ag tape is studied using quantitative transmission electron microscopy. Special attention is devoted to the occurrence of Pb‐rich liquids, which are crucial for the Bi2Sr2CaCu2O8+δ to (Bi,Pb)2Sr2Ca2Cu3O10+δ transformation. Ca and/or Pb‐rich (Bi,Pb)2Sr2CaCu2O8+δ grains dissolve into a liquid, which reacts with Ca‐rich phases to increase the liquid's Ca‐content. This leads to (Bi,Pb)2Sr2Ca2Cu3O10+δ formation. Apparently, a Ca/Sr ratio of around 1 is sufficient to keep (Bi,Pb)2Sr2Ca2Cu3O10+δ nucleation going. It is confirmed that Ag particles are transported from the Ag‐sheath into the oxide core by the liquid and not by mechanical treatment of the tape.

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“…Various important parameters need to be taken into account when performing wet milling, such as solids loading (liquid-to-powder ratio (LPR)), the balls-to-powder ratio (BPR) [53], and the speed and type of milling machine [54]. Elevated heat treatment temperatures (HTT) can result in the formation of hard agglomerates that are difficult to destroy with milling.…”

Section: Powder Millingmentioning

confidence: 99%

A Comparison of Bioactive Glass Scaffolds Fabricated ‎by Robocasting from Powders Made by Sol–Gel and Melt-Quenching Methods

Ben–Arfa

Pullar

2020

Processes

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Bioactive glass scaffolds are used in bone and tissue biomedical implants, and there is great interest in their fabrication by additive manufacturing/3D printing techniques, such as robocasting. Scaffolds need to be macroporous with voids ≥100 m to allow cell growth and vascularization, biocompatible and bioactive, with mechanical properties matching the host tissue (cancellous bone for bone implants), and able to dissolve/resorb over time. Most bioactive glasses are based on silica to form the glass network, with calcium and phosphorous content for new bone growth, and a glass modifier such as sodium, the best known being 45S5 Bioglass®. 45S5 scaffolds were first robocast in 2013 from melt-quenched glass powder. Sol–gel-synthesized bioactive glasses have potential advantages over melt-produced glasses (e.g., greater porosity and bioactivity), but until recently were never robocast as scaffolds, due to inherent problems, until 2019 when high-silica-content sol–gel bioactive glasses (HSSGG) were robocast for the first time. In this review, we look at the sintering, porosity, bioactivity, biocompatibility, and mechanical properties of robocast sol–gel bioactive glass scaffolds and compare them to the reported results for robocast melt-quench-synthesized 45S5 Bioglass® scaffolds. The discussion includes formulation of the printing paste/ink and the effects of variations in scaffold morphology and inorganic additives/dopants.

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Influence of the powder calcination temperature on the microstructure in Bi(Pb)-2223 tapes

Cited by 15 publications

References 6 publications

Microstructural evolution at the initial stages of annealing in a Bi-2223 multifilament tape

Microstructural evolution at the initial stages of annealing in a Bi-2223 multifilament tape

Quantitative Electron Microscopy of (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+δ/Ag Multifilament Tapes During Initial Stages of Annealing

A Comparison of Bioactive Glass Scaffolds Fabricated ‎by Robocasting from Powders Made by Sol–Gel and Melt-Quenching Methods

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Influence of the powder calcination temperature on the microstructure in Bi(Pb)-2223 tapes

Cited by 15 publications

References 6 publications

Microstructural evolution at the initial stages of annealing in a Bi-2223 multifilament tape

Microstructural evolution at the initial stages of annealing in a Bi-2223 multifilament tape

Quantitative Electron Microscopy of (Bi,Pb)2Sr2Ca2Cu3O10+δ/Ag Multifilament Tapes During Initial Stages of Annealing

A Comparison of Bioactive Glass Scaffolds Fabricated ‎by Robocasting from Powders Made by Sol–Gel and Melt-Quenching Methods

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Product

Resources

About

Quantitative Electron Microscopy of (Bi,Pb)₂Sr₂Ca₂Cu₃O_10+δ/Ag Multifilament Tapes During Initial Stages of Annealing