Sol-gel-Derived $\hbox{Al}_{2}\hbox{O}_{3}{-} \hbox{SiO}_{2}$ Composite Coating for Electrical Insulation in HTS Magnet Technology

Kandel, Hom; Lü, Jun; Jiang, J.; Han, Ke; Gundlach, S.; Viouchkov, Y.; Markiewicz, W.D.; Weijers, H.W.

doi:10.1109/tasc.2012.2204745

Cited by 12 publications

(5 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where E b is the dielectric strength, d is the coating thickness and is a power factor, varying 0.23 to 0.66 for most ceramic insulators [15,28,29,41,42]. A linear regression analysis of the dielectric strength data (Figure 8) gave an value of 0.24, consistent with the findings of Singh [34] for MgO thin films.…”

Section: Breakdown Characteristics Of Dipsupporting

confidence: 73%

See 1 more Smart Citation

Development of low temperature co-fired ceramic (LTCC) coatings for electrical conductor wires

Wang

Freer

Fang

et al. 2016

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

Dip coating was employed to apply low temperature co-firing ceramic (LTCC) zinc molybdate coatings to the surfaces of Ni-coated Cu conductor wires. Zinc molybdate ceramic powders were synthesized via a solid state route; ceramic suspensions for dip coating were prepared by mixing the LTCC powders in an organic solution. By optimizing the dip coating parameters and subsequent heat treatment, ceramic films, with a typical insulation thickness of 47.3 μm and dielectric strength of 24.2 kV•mm -1 , were formed on the surfaces of Ni test discs. The processing parameters were transferrable to the coating of Ni-coated Cu wires; the resulting wires exhibited an insulation thickness of 40.3 μm and breakdown voltage of 798 V.

show abstract

Section: Breakdown Characteristics Of Dipsupporting

confidence: 73%

“…Dip coating has been employed by many researchers to apply ceramic coatings to metallic substrates [12][13][14][15][16][17][18]. A variety of parameters can affect the state of the coatings and resulting properties of the coatings; these include the viscosity of starting suspension and dipping times.…”

Section: Introductionmentioning

confidence: 99%

Development of low temperature co-fired ceramic (LTCC) coatings for electrical conductor wires

Wang

Freer

Fang

et al. 2016

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

show abstract

“…We investigated sol-gel based ZrO 2 and Al 2 O 3 coatings through collaboration with Harran University, Turkey [26][27][28][29]. Sol-gel technology is widely used and advantageous for its ease of application and potential low cost [30]. However, a persistent lack of adhesion on Ag and the need for multiple dips to build up a thick enough insulation for Bi-2212/Ag RW makes us, presently at least, doubt this sol-gel approach is viable for long length coating.…”

Section: Discussionmentioning

confidence: 99%

Performance of titanium oxide–polymer insulation in superconducting coils made of Bi-2212/Ag-alloy round wire

Chen

Trociewitz

Dalban-Canassy

et al. 2013

Supercond. Sci. Technol.

View full text Add to dashboard Cite

Conductor insulation is one of the key components needed to make Ag-alloy clad Bi 2 Sr 2 CaCu 2 O 8+x (Bi-2212/Ag) superconducting round wire (RW) successful for high field magnet applications as dielectric standoff and high winding current densities (J w ) directly depend on it. In this study, a TiO 2 /polymer insulation coating developed by nGimat LLC was applied to test samples and a high field test coil. The insulation was investigated by differential thermal analysis (DTA), thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM), dielectric properties measurement, and transport critical current (I c ) properties measurement. About 29% of the insulation by weight is polymer. When the Bi-2212/Ag wire is full heat treated, this decomposes with slow heating to 400°C in pure O 2 . After the full reaction, we found that the TiO 2 did not degrade the critical current properties, adhered well to the conductor, and provided a breakdown voltage of >100 V, which allowed the test coil to survive quenching in 31.2 T background field, while providing a 2.6 T field increment. For Bi-2212/Ag RW with a typical diameter of 1.0-1.5 mm, this ~15 µm thick insulation allows a very high coil packing factor of ~0.74, whereas earlier aluminosilicate braid insulation only allows packing factors of 0.38-0.48.

show abstract

“…Such coatings should exhibit good adhesion and insulation properties to meet the requirements of equipment for components. The heat resistance and heat dissipation of coating material, furthermore, is considered to pose a great deal of help to the use of electrical steel due to overheating issues at high voltage [6,7].…”

Section: Introductionmentioning

confidence: 99%

Study on the Preparation of High-Temperature Resistant and Electrically Insulating h-BN Coating in Ethanol Solution by Electrophoretic Deposition

Jia

Wang

2021

Processes

View full text Add to dashboard Cite

A hexagonal boron nitride (h-BN) coating of micron thickness is deposited directly on 316L stainless steel (SS316L) cathode through efficient, adjustable electrophoretic deposition (EPD) in a suspension system containing surfactant and ethanol. It is based on the mixing of h-BN with polyethyleneimine (PEI) resulting in positively charged ceramic powder making cathodic electrophoretic deposition possible. The thickness of the resulting h-BN coatings deposited on SS316L could be controlled by varying the time and the voltage of electrophoretic deposition. The deposition kinetics and mechanism have been discussed. After soaking in Al(H2PO4)3 solution and high-temperature annealing, the h-BN coatings exhibited good adhesive strength. Furthermore, a novel method has been used for the evaluation of the adhesive strength to explore the appropriate experimental conditions. X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were employed to characterize the h-BN coatings. The h-BN coatings are applied for the DC breakdown performance test and exhibit remarkable breakdown voltage and breakdown strength.

show abstract

Sol-gel-Derived $\hbox{Al}_{2}\hbox{O}_{3}{-} \hbox{SiO}_{2}$ Composite Coating for Electrical Insulation in HTS Magnet Technology

Cited by 12 publications

References 18 publications

Development of low temperature co-fired ceramic (LTCC) coatings for electrical conductor wires

Development of low temperature co-fired ceramic (LTCC) coatings for electrical conductor wires

Performance of titanium oxide–polymer insulation in superconducting coils made of Bi-2212/Ag-alloy round wire

Study on the Preparation of High-Temperature Resistant and Electrically Insulating h-BN Coating in Ethanol Solution by Electrophoretic Deposition

Contact Info

Product

Resources

About