Analysis of Dielectric and Thermal Properties of Polyamide Enamel Filled With Carbon Nanotubes

Abstract

In recent days, there was a signi¯cant development in the area of nanoparticles and nanoscalē llers on dielectric, thermal and mechanical properties of polymeric materials. The dielectric and thermal properties of standard polyamide and nanoscale-¯lled samples were detailed and analyzed. Carbon nanotubes were used as nano¯llers. Carbon nanotubes were synthesized by chemical vapor deposition (CVD). The basic properties such as dielectric loss tangent (tan ), dielectric constant ("), dielectric strength, partial discharge inception voltage, surface resistivity, quality factor, phase angle, dielectric conductivity, dielectric power loss and thermal withstand strength of the polyamide enamel¯lled with carbon nanotubes were analyzed and compared with the properties of the standard enamel. The experimental results show that carbon nanotubes mixed with polyamide enamel had better thermal properties when compared to that of standard enamel.

Electrical and Thermal Characterization of Organic Varnish Filled with ZrO2Nano Filler Used in Electrical Machines

“…Here the dielectric measurements were carried out by Impedance spectroscopy (LCR HITESTER 3532-50) measuring instrument. It was also an experimental method of characterizing electrochemical systems [9][10][11][12]. This technique was also used to measure the impedance of a system over a range of frequencies, and the frequency response of the system including the energy storage and dissipation properties.…”

“…PD was usually beginning within voids, cracks, or inclusions within a solid dielectric, at conductor-dielectric interfaces within solid or liquid dielectrics, or in bubbles within liquid dielectrics. For solid insulating materials, certain criteria were available for the measurement of the breakdown voltage or the breakdown field strength on plate-like samples in a homogeneous or weakly inhomogeneous field [10][11][12]. A standardized testing arrangement for the determination of the breakdown field strength of plates or foils up to sample thickness of 3mm as per IEC 60243-1 was as shown in Figs.…”

“…It could also be defined as the voltage at which the current starts increasing to a very high value unless controlled by the external impedance of the circuit. The electric breakdown strength of insulating material was dependent on a variety of parameters, such as pressure, temperature, humidity, field configurations, nature of applied voltage, imperfections in dielectric materials, material of electrodes, and surface conditions of electrodes, layer thickness, and type of voltage, stress duration and frequency [12][13]. It was known that the breakdown voltage was also dependent on the nature and smoothness of the electrode material.…”

“…Knowledge of the thermal properties of the insulating materials was, therefore, important for the construction and design of equipment and setups. The most important thermal properties of the insulating materials were specific heat, Heat transport, linear thermal expansion, and thermal stability [1] [11][12]. A generally accepted definition of thermal analysis was given as follows: "A group of techniques in which a physical property of a substance and/or its reaction products was measured as a function of temperature whilst the substance was subjected to controlled temperature program".…”

“…Some materials can gain weight by reacting with the atmosphere in the testing environment. Since weight loss and gain were disruptive processes to the sample material or batch, knowledge of the magnitude and temperature range of those reactions are necessary in order to design adequate thermal ramps and holds during those critical reaction periods [12][13]. In the Diamond TG/DTA 6000 Instrument system the sampling size could be analyzed from 0.1mg to 10g and the heating rate of 0.1-50°C/min for the temperature range from 50°C to 700°C 13 .…”