scholarly journals A Study on the Partial Discharge Resistance Properties of Epoxy/Micro/Nano Alumina Composites

2016 ◽  
Vol 65 (6) ◽  
pp. 1026-1031
Author(s):  
Jae-Jun Park
Keyword(s):  
Partial Discharge ◽  
Nano Alumina ◽  
Alumina Composites

scholarly journals Effects of Plasma Treated Alumina Nanoparticles on Breakdown Strength, Partial Discharge Resistance, and Thermophysical Properties of Mineral Oil-Based Nanofluids

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3610
Author(s):  
Norhafezaidi Mat Saman ◽  
Izzah Hazirah Zakaria ◽  
Mohd Hafizi Ahmad ◽  
Zulkurnain Abdul-Malek
Keyword(s):  
Thermal Conductivity ◽  
Plasma Treatment ◽  
Base Fluid ◽  
Breakdown Strength ◽  
Partial Discharge ◽  
Mineral Oil ◽  
Transformer Oil ◽  
Alumina Nanoparticles ◽  
Discharge Characteristics ◽  
Nano Alumina

Mineral oil has been chosen as an insulating liquid in power transformers due to its superior characteristics, such as being an effective insulation medium and a great cooling agent. Meanwhile, the performance of mineral oil as an insulation liquid can be further enhanced by dispersing nanoparticles into the mineral oil, and this composition is called nanofluids. However, the incorporation of nanoparticles into the mineral oil conventionally causes the nanoparticles to agglomerate and settle as sediment in the base fluid, thereby limiting the improvement of the insulation properties. In addition, limited studies have been reported for the transformer oil as a base fluid using Aluminum Oxide (Al2O3) as nanoparticles. Hence, this paper reported an experimental study to investigate the significant role of cold plasma treatment in modifying and treating the surface of nano-alumina to obtain a better interaction between the nano-alumina and the base fluid, consequently improving the insulation characteristics such as breakdown voltage, partial discharge characteristics, thermal conductivity, and viscosity of the nanofluids. The plasma treatment process was conducted on the surface of nano-alumina under atmospheric pressure plasma by using the dielectric barrier discharge concept. The breakdown strength and partial discharge characteristics of the nanofluids were measured according to IEC 60156 and IEC 60270 standards, respectively. In contrast, the viscosity and thermal conductivity of the nanofluids were determined using Brookfield DV-II + Pro Automated viscometer and Decagon KD2-Pro conductivity meter, respectively. The results indicate that the 0.1 wt% of plasma-treated alumina nanofluids has shown the most comprehensive improvements in electrical properties, dispersion stability, and thermal properties. Therefore, the plasma treatment has improved the nanoparticles dispersion and stability in nanofluids by providing stronger interactions between the mineral oil and the nanoparticles.

The effect of process parameters on machining of magnesium nano alumina composites through EDM

2009 ◽  
Vol 46 (9-12) ◽  
pp. 1035-1042 ◽  
Author(s):  
K. Ponappa ◽  
S. Aravindan ◽  
P. V. Rao ◽  
J. Ramkumar ◽  
M. Gupta
Keyword(s):  
Process Parameters ◽  
Nano Alumina ◽  
Alumina Composites

Tribological Properties of Magnesium Nano-Alumina Composites under Nano-Graphite Lubrication

2012 ◽  
Vol 55 (3) ◽  
pp. 334-344 ◽  
Author(s):  
L. Das ◽  
M. Aggarwal ◽  
K. Rajkumar ◽  
S. Aravindan ◽  
M. Gupta
Keyword(s):  
Tribological Properties ◽  
Nano Alumina ◽  
Alumina Composites

scholarly journals Wear Behavior on Magnesium Reinforced with Nano Alumina Particulates

2019 ◽  
Vol 8 (11) ◽  
pp. 2873-2876
Keyword(s):  
Wear Behavior ◽  
Constant Load ◽  
Wear Property ◽  
Matrix Composites ◽  
Wear Properties ◽  
Wear Performance ◽  
Nano Alumina ◽  
Alumina Particles ◽  
Alumina Composites ◽  
High Level

The present study explores the wear properties of Mg composites with different amounts of nano- alumina particles (up to 1.4 vol. percent). Tests are carried out on wear device with a constant load of 10N, at sliding speeds range between 1 to 10 m/s compared to EN31 steel disks. Magnesium metal matrix composites reinforced by 1.4 volume percent of alumina particles (nano – sized) possess mechanical properties equivalent or even superior to alike composites of high level micron reinforcement. The outcomes reveals that the introduction of nano powder in various proportions influences the increment of wear performance of magnesium alloy and shows better wear performance at both the speeds by adding 1.4 volume % nano Al2O3 to the pure Mg and other Mg- Al2O3 composites. Due to the presence of Al2O3 as reinforcement for lower and higher sliding speeds, the improvement if found in wear property. The enhancement in wear property of the nano- composites is due to the increased hardness and strength with the nano- alumina particles presence in matrix. Initially there is increase in porosity by the addition of nano alumina to magnesium and later decreased gradually by inceasing the nano alumina percentage. Magnesium nano alumina composites can be considered as an excellent material because of better wear components are of major importance, mainly used in the aerospace and automotive engineering applications.

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