Er2O3-ZrO2 insulation coatings on Ag/AgMg sheathed Bi-2212 superconducting tapes by sol-gel process
2002 Applied Superconductivity Conference, Houston, TX, Amerika Birleşik Devletleri, 4 - 09 Ağustos 2002, cilt.13, ss.2988-2991, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Cilt numarası: 13
- Doi Numarası: 10.1109/tasc.2003.812048
- Basıldığı Şehir: Houston, TX
- Basıldığı Ülke: Amerika Birleşik Devletleri
- Sayfa Sayıları: ss.2988-2991
- Anahtar Kelimeler: Er2O3-ZrO2, Insulation, Sol-gel and HTS
- Ankara Yıldırım Beyazıt Üniversitesi Adresli: Hayır
Özet
We have fabricated high temperature insulation coatings on long-length superconducting tapes and wires using a reel-to-reel sol-gel dip coating system for HTS/LTS coils at NHMFL. In this work, 8 mol% Er2O3 -ZrO2 coatings were deposited on Ag or AgMg sheathed Bi2Sr2Ca1Cu2Ox (Bi-2212) superconducting tapes. The insulation solution was prepared with Zr and Er based organometallic compounds. The gel layers were transformed to amorphous layers at about 300 °C for 30 sec. in air. The ceramic oxide coatings were subsequently formed at 600 °C for 60 sec. in air. The coatings on Ag/AgMg sheathed Bi-2212 tapes were finally densified by annealing at 862 °C for 12 h under oxygen gas flow. These coatings were characterized by means of ESEM, DTA, and XRD. Dielectric constant, breakdown voltage and resistance values of the coatings were measured using a standard multimeter and power supply. ESEM revealed that surface morphology of the coatings is mosaic structure. XRD and DTA studies show that cubic phases formed at between 450 °C and 600 °C. Dielectric constant, high voltage breakdown and resistance values of the insulations were found to be 20, 1096 V at 1.5 mA and 14 M-Ohms, respectively.