Study of Polyamide Coating on Aluminum Substrate by Different Methods

• Other Authors: Wang, Huazhong (authoraut)
• Format: Others
• Language: English; English
• Published: Florida State University
• Subjects: Electrical engineering; Computer engineering
• Online Access: http://purl.flvc.org/fsu/fd/FSU_migr_etd-1265

A 3.5MVA High Temperature Superconductor (HTS) transformer has been in design at FAMU-FSU College of Engineering since 2002. The coils of the HTS transformer use stainless steel sheathed Bi2223 HTS wire. In order to make insulation around the HTS transformer coils, research has been conducted. The results of this research are the main contents of this thesis. Since Siemens constructed the first HTS transformer in 1997, several HTS transformer projects have been developed around the world. In these HTS transformers, coils generally were wrapped by insulation materials. This insulation method is not ideal since wrapped insulation has disadvantages: displacement of insulation materials, low efficiency and variable insulation effect. In order to find a better approach, we wanted to investigate polymer coatings around HTS transformer coils. Polyamide 6 coatings were made on aluminum substrate utilizing dipping, brush and spray methods. After which, their properties were studied, including density, breakdown strength, dielectric constant and dissipation factor. Through comparison of properties, spray coatings show the best insulating effect. Our research also included influence of heat treatment and vacuum treatment on spray coatings. Heat and vacuum treatments effect on breakdown strength is insignificant. Vacuum treatment can greatly increase the density of the coating. Heat treatment influences the dielectric constant and dissipation factor. But the breakdown strength of spray coatings is only one fifth of that of commercial polyamide film. And the density of spray coatings is about 60% of that of commercial polyamide film. All studies about polymer coating were conducted at room temperature. === A Thesis Submitted to the Department of Electrical and Computer Engineering in Partial Fulfillment of the Requirements for the Degree of Master of Science. === Summer Semester, 2004. === June 18, 2004. === High Temperature Superconductor, Dielectric Strength, Dissipation Factor, Dielectric Constant, Coating, Polyamide === Includes bibliographical references. === Jim P. Zheng, Professor Directing Thesis; Thomas L. Baldwin, Committee Member; Hui Li, Committee Member.