Development of 200 meter HoBCO Coated Conductors on Ni-Alloy Textured Substrates
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Abstract:
(Ho 1 Ba 2 Cu 3 O x ) (HoBCO) coated conductors on textured Ni-alloy substrates were developed by using pulsed laser deposition (PLD). Hetero-epitaxial growth of CeO 2 /YSZ/CeO 2 was used to introduce in-plane alignment for buffer layers. CeO 2 seed and cap layers were deposited by RF sputtering. YSZ diffusion layer was deposited by PLD. The most advantage of these buffer layers are high growth rate and large deposition area by using textured substrate. As for the HoBCO deposition, a production speed of 20 m/h with growth rate of 2-3 mum per minute was demonstrated in our PLD process. By optimizing the deposition temperature, lc and Jc of the short samples reached 265 A/cm-width and 5.6 MA/cm 2 at 77 K, 0 T, respectively. Long length HoBCO conductors over 200 m were performed by using reel to reel tape transfer system of each process.Cite
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Porous SiC Ceramics with Multiple Pore Structure Fabricated via Gelcasting and Solid State Sintering
Porous SiC ceramics with multiple pore structures were fabricated via gelcasting and solid state sintering.A novel gelling agent of Isobam was applied and PMMA was used as both foam stabilizer and pore forming agent.The mechanical properties of porous SiC ceramics were investigated as functions of PMMA content, rotating speed of ball mill, and sintering temperature.With PMMA content increasing from 5wt% to 20wt%, the foaming effect was inhibited while the stability of bubbles increased.When the rotating speed was 220 r/min, the open porosities of the as-prepared SiC ceramics sintered at 2100 varied ℃ from 51.5% to 72.8%, and compressive strength varied from 7.9 to 48.2 MPa.With the rotating speed increasing from 220 to 280 r/min, the foaming effect was aggravated and the porosities of SiC ceramics sintered at 2100 increased.℃ While the sintering temperature increasing from 2050 to 2150 , ℃ the SiC ceramics prepared with PMMA content of 20wt% at rotating speed of 220 r/min decreased in the open porosities while increased in compressive strength.
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ZrB2 based composites containing 10 vol.-% carbon nanotubes (CNTs) are synthesised by spark plasma sintering at temperatures ranging from 1600 to 18008C and at an applied pressure of 25 MPa. The effects of sintering temperature on densification behaviour, microstructural evolutions and mechanical properties are presented. Results indicate that ZrB2-CNT composites fabricated at 16508C have the optimal combination of dense microstructure and properties. The fracture toughness is sensitive to the temperature change and reaches 7.2 MPa m1/2 for the CNT toughened ZrB2 ceramics, which is higher than the measured result for monolithic ZrB2 (3.3 MPa m1/2). The crack deflection and CNT pullout are the dominant toughening mechanisms.
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Spark Plasma Sintering
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