CHARACTERIZATIONS OF CERAMIC INSULATION COATINGS ON STAINLESS-STEEL TAPES FOR MAGNET TECHNOLOGY

Abstract

Characterizations of high temperature ceramic insulation coatings were investigated by surface conductivity, electric strength, dielectric constant, mass lost and corrosion techniques. MgO-ZrO₂ was coated on Stainless-Steel-304 (SS) tapes by reel-to-reel sol-gel process for investigation of characterizations of MgO-ZrO₂ as insulation coatings. Tapes were produced several dips for application of HTS/LTS high field insert coils and magnets. Solutions were prepared by using Mg and Zr based precursors, solvent and chelating agent, then the insulations was coated on long-length SS substrate. Characterizations of electrical strength and dielectric constant were tested by using standardization equipment. Thermogravimetric (TGA) analyzes in air and in nitrogen was done. The effect of corrosion test according to the standardization of ASTM B 117 was studied. Surface morphology of micrographs of corrosion test samples was examined using ESEM.

Keywords

• Electrical properties; dielectric constant; TGA analyzes; corrosion resistance; MgO-ZrO2

References

1. [1] Kim, J-H.; Ignatova, V.; Kücher, P.; Heitmann, J.; Oberbeck, L.; and Schröder, U.: “Physical and Electrical Characterization of high-k ZrO2 metal-Insulater-Metal Capacitor”, Thin Solid Films, Vol. 516, Issue 23, (2008) 8333-8336
2. [2] Celik, E.; Mutlu, I.H. and Hascicek, Y.H.: “Electrical Properties of MgO-ZrO2 Insulation Coatings on Ag and AgMg/Bi-2212 Tapes for Magnet Technology”, Scripta Materilia, Vol. 47, No: 5, (2002) 315-320.
3. [3] Cakiroglu, O.; Arda, L; Aslanoglu, Z.; Akin Y.; Dur, O.; Kaplan, A.; Hascicek, Y.H.:“Electrica Properties of Sol-Gel MgO-ZrO2 Insulation Coatings Under Compression For Magnet Technology”, Advances in Cryogenic Engineering, 50 (2004) 184–190.
4. [4] Arman, Y.; Sayman, O.; Çelik, E.; Aksoy, S.; and Hasçiçek, Y.H.: “The effect on residual stresses of porosity and surface roughness in high temperature insulation coatings on Ag tape for magnet Technologies”, Journal of Materials Processing Technology, Vol. 206, Issues 1-3 (2008) 241-248.
5. [5] Celik, E.; Mutlu, I.H.; and Hascicek, Y.H.; USA Patent Application Pending, May, 1998.
6. [6] Casselton, R. E. W.: “Electrical conductivity of ceria-stabilized zirconia”, Physica Status solidi (a), Vol.,1 Issue 4 (2006) 787 – 794.
7. [7] Mosunov, A.V. and Podzorova, L. I.:“Dielectric properties and electrical conductivity of ZrO2-CeO2 ceramics”, Inorganic Materials, Vol. 44, Number 7 (2008) 785-790
8. [8] Cakiroglu, O.: “High voltage breakdown studies testing of sol-gel MgO-ZrO2 insulation coatings under various compressions at 298 K and 77 K”, Moldavion Journal of the Physical Science, 4, N1, (2005) 49–53

9. [9] Vestn, R. W. and Tallan, M.: “Electrical Properties and Defect Structure of Zirconia: II, Tetragonal Phase and Inversion”, Journal of the American Ceramic Society, Vol. 48, Issue 9 (2006) 472 – 475.
10. [10] Cakiroglu, O.; Arda, L.; Poyraz, C.; and Sacli, O.A.: “Electrica Characterizations of MgO-ZrO2 High Temperature Sol-Gel Insulations Coatings on Different Types of Epoxies”, IEEE Transactions on Applied Superconductivity, Vol. 18, Number 2 (2008) 1398–1401.
11. [11] Kyosuke, O. and Eısuke, T.: “Characterization of High Dielectric Constant ZrO2 and SrZrO3 Thin Films Prepared by Sol-gel Method”, IEIC Technical Report (Institute of Electronics, Information and Communication Engineers), Vol.100, No.517 (2000) 79–83.
12. [12] Cakiroglu, O.; Arda, L.; Hascicek, Y.H.: “High voltage breakdown studies of sol-gel MgO-ZrO2 insulation coatings under various pressures at 298 K and 77 K”, Physica C, 422 (2005) 117–126.
13. [13] You, H-C.; Ko, F-H.; and Lei, T-F.: “Physical Charecterization and Electrical Properties of Sol-Gel Zirconia Films”, J. Electrochem. Society, Vol. 153, Isuue 6 (2006) 94-99.
14. [14] Srinivasan, R.; Keogh, R. A.; Milburn, D. R.; and Davis, B. H.: “Sulfated Zirconia Catalysts: Characterization by TGA/DTA Mass Spectrometry”, Journal of Catalysis, Vol. 153, Issue 1(1995) 123-130.
15. [15] Serena, S.; Sainz, M.A.; and Caballero, A.: “Corrosion behavior of MgO/CaZrO3 refractory matrix by clinker”, Journal of the European Ceramic Society, Vol. 24, Issue 8 (2004) 2399-2406.
16. [16] Surviliene, S.; Oleksiak, A. L. and Češuniene, A.: “Effect of ZrO2 on corrosion behaviour of chromium coatings”, Corrosion Science, Vol. 50, Issue 2 (2008) 338–344.
17. [17] Cakiroglu, O. and Palistrant, N.: “Electrical Properties of MgO-ZrO2 Insulation Coatings on Different Types of Epoxies”. Moldavian Journal of the Physical Science, Vol. 6, N2 (2007) 232–238.
18. [18] Mutlu, I.H.; Celik, E and Hascicek, Y.H.: “High temperature insulation coatings and their electrical properties for HTS/LTS conductors”, Physica C: Superconductivity and its applications, 370 (2002) 113–124.
19. [19] Kim, J-H.; Ignatova, V. A. and Weisheit, M.: “Annealing effect on physical and electrical characteristics of thin HfO2, HfSixOy and HfOyNz films on Si”, Microelectronic Engineering, doi:10.1016/j.mee.2008.11.012.
20. [20] Jung, Y-G.; Choi, S-C.; Oh, C-S. and Paik, U-G.: “ Residual stress and thermal properties of zirconia/metal (nickel, stainless steel 304) functionally graded materials fabricated by hot pressing”, Journal of Materials Science, Vol. 32, Number 14 (1997)
21. [21] French, P.R.H.; Glass, S.J.; Ohuchi, F.S.; Xu, Y-N. and Ching, W.Y.: “Experimental and theoretical determination of the electronic structure and optical properties of three phases of ZrO2”, Review B, 49, (1994) 5133 –5142.
22. [22] Ataoglu, S.; Arda, L.; Bulut, O.; Cakiroglu, O.; Gulluoglu, A.N. and Belenli, I.: “Preparation and thermal stres analysis of Al2O3 insulation coatings on SS–304 tape” IEEE Transactions on Applied Superconductivity, 2009. in published.
23. [23] Vanderbilt, D.; Zhao, X. and Ceresoli, D.: “Structural and dielectric properties of crystalline and amorphous ZrO2”, Thin Solid Films, Vol. 486, Issues 1-2 (2005) 125-128.
24. [24] Zhao, X.; Ceresoli, D. and Vanderbilt, D.: “Structural, electronic and dielectric properties, Amorphous ZrO2 from Ab-initio molecular dynamics”, Phys. Rev. B 71 (2005) 85107-85113.
25. [25] Lui, W.; Chen, Y.; Ye C. and Zhang, P.: “Preparation and characterization of doped sol–gel zirconia films”, Ceramics International, Vol. 28, Issue 4 (2002) 349-354.
26. [26] Yamamoto, O.; Takeda, Y.; Kanno, R. and Kohno, R.; “Electrical conductivity of tetragonal stabilized zirconia”, Journal of Materials Science, Vol. 25, Number 6 (1990) 2805–2808.
27. [27] Wilk, G. D.; Wallace, R.M. and Anthony, J. M.: et al. “Dielectric Constant ZrO2; 25 at mono, tetragonal and cubic phase”, J. Appl. Phys., 89 (2001) 52435247.