Recent Highlights on Chemical Solutionbased REBaCuO Coated Conductors from Shanghai University

Size: px

Start display at page:

Download "Recent Highlights on Chemical Solutionbased REBaCuO Coated Conductors from Shanghai University"

Andra Stone
5 years ago
Views:

from Shanghai University Chuanbing Cai ( 蔡传兵 ) Shanghai Key Laboratory for High

1 IAS Program on High Energy Physics-Accelerator Physics HKUST, Jan , 2017 Recent Highlights on Chemical Solutionbased REBaCuO Coated Conductors from Shanghai University Chuanbing Cai ( 蔡传兵 ) Shanghai Key Laboratory for High Temperature Superconductors, Shanghai University Shanghai Creative Supercond. Technol. Co. Ltd. cbcai@t.shu.edu.cn

2 Outline 1 Technology Roadmap for Practical HTS Materials 2 China Research & Industrialization on 2G HTS Tapes 3 Advance in Cost-effective 2G HTS Tapes in Shanghai 4 Power Application Demo in China & Material Challenge

3 Fundamental Challenges of HTS Application Jc limited by weak Layered structure ξ ab = nm;ξ c = 0.2-1nm Giant flux motion by thermal fluctuation high running temperature Low pinning potential of single vortex(~ n ) HTS YBCO Bi2212 [Amrein, 94] Bi2223 LTS B 0 J c (J) = J c0 * exp (-(J-4 )/2.4 ) for J > 4

4 MTG-YBCO Single-domain Bulks for Mag-lev Devices MTG-YBCO Bulk From Prof. Xu,Phys. Dept., Shanghai Uni.

5 Architectures for HTS Coated Conductors Key issues (1): biaxial texture and epitaxial growth Key issues (2): High-density flux pinning centers C.Cai et al., PRB 69(2004) c a b HTS Layer: REBaCuO Buffer: Y2O3, La2Zr2O7 Substrate: Textured Ni-W Untextured Ni-based Tape

Articles: Cai et al, Progress in Physics (Chinese),4(2007)467 Cai et al,

6 Technology Routes:Biaxial Textured Buffer + Epitaxial HTS Film Buffer Layer Texture via: RABiTS IBAD ISD HTS Layer Deposition via: Review Articles: Cai et al, Progress in Physics (Chinese),4(2007)467 Cai et al, Advance in China Materials,30(2010)1 PVD(PLD RCE); MOD ; MOCVD Ex-situ techniques

Main Groups and Techniques Applied for 2G HTS Tapes in China R&D Research Groups & Industry Partners Buffer Layer HTS Layer textured NiW untextured MOCVD tape via IBAD PLD MOD Tsinghua Uni.

7 Main Groups and Techniques Applied for 2G HTS Tapes in China R&D Research Groups & Industry Partners Buffer Layer HTS Layer textured NiW untextured MOCVD tape via IBAD PLD MOD Tsinghua Uni. Beijing Tech. Uni. Northwest INM Southwest Jiaotong Uni. IEE CAS Uni. Electr. Sci.Tech R2R Beijing GRINM R2R R2R R & D/ Industry Suzhou Advanced Materials(SAMRI) Shanghai Jiaotong Uni. /SSTC Shanghai Uni. /SCSC R2R R2R R2R R2R R2R R2R R2R R2R

HTS Coated Conductors @Shanghai University & Spinning-off Company, SCSC Textured Oxide Buffers

via MOD SCSC: Shanghai Creative Supercond. Technol Co.

8 HTS Coated University & Spinning-off Company, SCSC Textured Oxide Buffers on Textured or Untextured Tape via RABiTS or IBAD Epitaxial HTS Films on Textured Oxide Buffer via MOD SCSC: Shanghai Creative Supercond. Technol Co. Ltd MOD-HTS Layer Two ways for Oxide Buffer on Textured or Untextured Coating & Pyrolysis Slitting & Package Protection Crystalliztion

9 Outline 1 Technology Roadmap for 2G HTS Tapes 2 China Research & Industrialization on 2G HTS Tapes 3 Advance in Cost-effective 2G HTS Tapes in Shanghai 4 Power Application Demo and Challenge for 2G Tapes

accurate to modify composition 100% utilization of precursor solution Readily scale up for wide-web process Dirty

10 Cost-effective Route Developed at Shanghai Uni. & Shanghai Creative Supercond. Technol. Co.(SCSC) Coating and Low-temperature Pyrolysis MOD-RBaCuO Cost-effective MOD Non-vacuum, low cost tools Easy and accurate to modify composition 100% utilization of precursor solution Readily scale up for wide-web process Dirty films, but helpful for pinning High-temperature Crystallization Independently developed pilot lines Smart control system In-situ quality inspection

11 On-line Observation for Texture Evolution of Oxide Buffer on Untextured Tape Peak pattern and intensity with increasing deposition times 50s 220s Copyright 2003 Fair Isaac Corporation. All rights reserved. 11

Evaluation Method Developed for Texture of

Characteristic Method Developed For in-situ

12 Evaluation Method Developed for Texture of Oxide Buffer Direct comparison of time dependence of In-situ RHEED pattern and ex-situ x-ray Phi scanning (024) Characteristic Method Developed For in-situ Check of Texture Copyright 2003 Fair Isaac Corporation. All rights reserved. 12

13 On-line Check for Texture of Kilometer s Oxide Buffer on Untextured Metallic Tapes

14 Industrial Process for MOD-RBaCuO Coated Conductors Solution Preparation Coating + Low temperature Pyrolysis Oxygenation High-temperature Crystallization

Key Issues for MOD-derived YBCO Coated Conductors To increase the production rate Shorter Pyrolysis Time: Low-fluorine; Additions such as DEA/TEA Less Crystallization Time: Low ambient pressure; Fast

15 Key Issues for MOD-derived YBCO Coated Conductors To increase the production rate Shorter Pyrolysis Time: Low-fluorine; Additions such as DEA/TEA Less Crystallization Time: Low ambient pressure; Fast gas flow μm YBCO by single MOD coating To improve performance Increased thickness of YBCO layer Enhanced flux pinning via doping Improved morphology via doping Copyright 2003 Fair Isaac Corporation. All rights reserved. 15

Dramatic Reduction For Pyrolysis Time of MOD ΔG < 0, Possible

G ( products ) f, T G ( reactants ) f, T Pyrolysis time reduced

solutions Smooth and dense films obtained at a pyrolysis rate as

16 Dramatic Reduction For Pyrolysis Time of MOD ΔG < 0, Possible reaction ΔG = 0,Balanced reaction ΔG > 0, Impossible reaction G T G ( products ) f, T G ( reactants ) f, T Pyrolysis time reduced to be as short as one minute using extremely low F-content solutions Smooth and dense films obtained at a pyrolysis rate as high as 25 K/min Copyright 2003 Fair Isaac Corporation. All rights reserved. 16

17 Potential enhancement and optimization of Tc by preventing from happening the over-doped The relationship between XRD intensity ratio I(006)/I(005) and the c-axis lattice parameters responding to oxygen content. Jiang HB, Cai CB et al., unpublished Copyright 2003 Fair Isaac Corporation. All rights reserved. Tc (onset) vs the c-axis parameter in YBCO films annealed at different temperature in flowing pure oxygen gas (solid), and mix of nitrogen and oxygen (open). 17

18 Long REBaCuO Tapes Developed at SCSC Local J C (77K,self field) > 2MA/cm 2

19 Texture Properties for Bilayer and Triple HTS Tapes In-plane texture Overseas Level In-plane From bilayer to triple HTS layers ~4 Out-ofplane ~2 Out-plane texture

20 Critical Current for Typical MOD-HTS Tapes at SCSC Ic:320~387A, Average Ic: 361A Mean Derivation: 6.25A Dynamic Measurement (77K,self field) C I c 368A

21 Critical Current for Multiple MOD-Coating Tapes at SCSC Ic:350~420A Inductive Measurement (77K,self field) I c : A 77K,Self Field

22 Typical Performance for SCSC Tapes of 4mm Width 77K

23 Increasing Yield Rate of HTS Tapes Produced at SCSC 65% 78% 68% 63% 93% 84% 80% 基带 47% 38% 缓冲层超导层 In case of: Smooth Substrate (RMS<1nm); High-textured buffer(fwhm<7); High HTS Self-field)

25 Joint Technology Development at Shanghai Uni. & SCSC 6 Lapping length:10cm; Solder material:sn-bi Voltage (E-5V) Slope: 5.85E-9 Copyright 2003 Fair Isaac Corporation. All rights reserved. 4mm-width/Cu thickness ~5μm 4mm-width/Brass Lamination 12mm-width/Cu Lamination Current (A) 25

26 Outline 1 Technology Roadmap for Practical HTS Materials 2 China Research & Industrialization on 2G HTS Tapes 3 Advance in Cost-effective 2G HTS Tapes in Shanghai 4 Power Application Demo in China & Material Challenges

27 HTS Tape Power Application Research Project Research Project Xian Hefei Suzhou Chendu HTS Tape Manufacturer Application demo Main Research Projects and Application Demo in China

上海电缆研究所 SHANGHAI ELECTRIC CABLE RESEARCH INSTITUTE 2G HTS Cable

Physical Characteristics - Materials ~ 2G HTS Wire - Length ~

Hardware Deliverables - Three ~50 m Long Phase Conductors - Six

28 上海电缆研究所 SHANGHAI ELECTRIC CABLE RESEARCH INSTITUTE 2G HTS Cable System Electrical Characteristics - Design 35kV/2000A ~ 120MVA Physical Characteristics - Materials ~ 2G HTS Wire - Length ~ 50m - HTS Conductor Length ~13km - Cold Dielectric Design Hardware Deliverables - Three ~50 m Long Phase Conductors - Six 35kV Outdoor Terminations 2G HTS Cable Demo at Baosteel, since Dec 2013

29 T(K) HTS: Enabling Power Applications, but needing improved Birr... Cables Fault Current Limiters Motors Generators Transformers SMES Fusion 20 MRI B(T) NMR Magnets YBa 2 Cu 3 O 7-x is able to push all the power applications up to the present limits Lenght, allowed cost and required performances strongly differ ( 1 km to 300 km) X. Obradors, T. Puig, SUST 27, (2014)

30 Critical Current Density (MA/cm 2 ) Nanotechnology engineering has enabled YBCO to bit LTS at all regions Critical Current Density (MA/cm 2 ) APC-Introduced APC-Introduced YBCO YBCO film film NbTi(4.2 NbTi(4.2 K) K) Nb Nb3 3 Sn(4.2 K) K) Nanotechnology Vortex pinning problem: high magnetic field critical currents 77 K Polycrystalline Polycrystalline YBCO tape YBCO tape Epitaxial Epitaxial YBCO YBCO film film Long length Biaxial Long length Biaxial Texturing Texturing Grain boundary problem: low field critical currents Magnetic Field (T) Magnetic Field (T) X. Obradors, T. Puig, SUST 27, (2014)

31 Other challenges for power application of 2G HTS tapes Various stresses in service state; Electromagnetic force Thermal induced stress Bending induced stress Application handling round, isotropic shape wanted Cost/Perfromance

Summary Main technology roadmaps for HTS tapes, including biaxially textured routes for buffer, and the industrial coating techniques for HTS layers.

32 Summary Main technology roadmaps for HTS tapes, including biaxially textured routes for buffer, and the industrial coating techniques for HTS layers. Research groups, and three industrial partners in China, using MOCVD, PLD as well as MOD coating techniques respectively. Hundreds of meters long tapes with A/cm-w at 77K achieved daily. Recent progress for cost-effective MOD-based HTS tapes at Shanghai Creative Supercond. Technol. Co. Ltd., appearing promising for scaling up. Several HTS power application demos in China, appearing promising, while materials challenges still there.

33 Thank you for your attention Spinning off 上创超导 SCSC Shanghai Creative Supercond. Technol. Co. Ltd.(SCSC)

34 Welcome visit Shanghai Creative Supercond. Technol. Co. Ltd.

Recent Development for REBaCuO Coated Conductors in China

IO-12, 17:40-18:05 pm Monday, September 12 Recent Development for REBaCuO Coated Conductors in China Chuanbing Cai Shanghai Key Laboratory for High Temperature Superconductors, Shanghai University, China