scholarly journals Characterization of Carbon Brush from Coconut Shell for Railway Application

2015 ◽  
Vol 773-774 ◽  
pp. 291-295
Author(s):  
Mohd Halim Irwan Ibrahim ◽  
M.N. Said ◽  
Rosli Asmawi
Keyword(s):  
Epoxy Resin ◽  
Copper Powder ◽  
Current Flow ◽  
Nitrogen Atmosphere ◽  
Electric Machines ◽  
Raw Material ◽  
Coconut Shell ◽  
Cylindrical Shape ◽  
Flow Through

Carbon brush has been developed for several decades for electric machines in microelectronic era. It is the electromechanical that connect the circuit to generate an electric motor. Mineral graphite always used as a raw material in producing carbon brush beside the uses of charcoal. This study is propose to use a coconut shell (CS) as waste material that can be recycle and sustainable to produce a carbon pre-cursor. This research is conducted to minimize the percentage of graphite or charcoal as a raw material in producing a carbon brush by replaced a CS as a raw material and produce a carbon brush for railway application. Several process such as baking, crushing, sieving, mixing, compacting and sintering are used in this study to produce a carbon brush. The formation of the carbon (C) had been produced by reaction of combustion in nitrogen atmosphere with 800°C temperature to produce carbon pre-cursor. The carbon brush sample then been prepared by mixing a copper powder and epoxy resin with different ratio of mixture. The suitable percentage of epoxy resin that could form a solid cylindrical shape was 15 %. Sample of carbon brush had been baked at 800°C to form the highest carbon. In this study, copper powder can produce a better conductivity where the sample can permit current flow through it. By using 60 % copper powder, the sample produce less porosity which resulted for high density. Lesser the pores of carbon brush sample produce low resistivity and high conductivity.

Preparation and Characterization of Epoxy/Alumina Nanocomposites

2020 ◽  
Vol 20 (5) ◽  
pp. 2964-2970 ◽  
Author(s):  
Minjie Wu ◽  
Linfeng Lu ◽  
Linhai Yu ◽  
Xiaoyan Yu ◽  
Kimiyoshi Naito ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Epoxy Resin ◽  
Nitrogen Atmosphere ◽  
Excellent Thermal Stability ◽  
Elongation At Break ◽  
Pure Epoxy ◽  
Nano Alumina ◽  
Fractured Surface ◽  
Scanning Electron

Nano-alumina (Al2O3, 30 nm) particles were employed to reinforce and toughen epoxy resin. The effects of Al2O3 nanoparticles on the mechanical properties of the composites were investigated by tensile and impact tests. It shows that the mechanical properties of epoxy nanocomposites have been improved significantly. For the prepared nanocomposite with 3.0 wt.% of Al2O3 addition, the tensile strength, elongation at break and impact strength reached 74.83 MPa, 10.63% and 13.79 kJ/m2, and were improved by 82.60%, 33.38% and 63.58%, respectively, compared with those of pure epoxy resin. The epoxy/Al2O3 nanocomposites also show good dielectric properties and excellent thermal stability under nitrogen atmosphere. Investigation of fractured surface of the obtained nanocomposites was carried out to study the dispersion of nanoarchitectonics Al2O3 with scanning electron microscopy.

scholarly journals KARAKTERISASI BESARAN MAGNET PERMANEN DARI HASIL CAMPURAN NdFeB DAN SERBUK EPOXY RESIN

2020 ◽  
Vol 22 (2) ◽  
Author(s):  
Herawati Herawati ◽  
Asep Yuyu
Keyword(s):  
Epoxy Resin ◽  
Permanent Magnets ◽  
Raw Materials ◽  
Atomic Ratio ◽  
Hydraulic Press ◽  
Raw Material ◽  
Cylindrical Shape ◽  
Dc Motors ◽  
Composition Variation ◽  
Sample Test

The bonded permanent magnet Nd 2 Fe 14 B has been made using raw materials Nd-Fe-B powder mixed withadhesive epoxy resin . Permanent magnets can be applied as a component of small DC motors and car parts.NdFeB composition variation on epoxy resins are made with the ratio of 93 : 7, 95 : 5, 90 : 10, 80 : 20, 70 : 30, 60: 40, 50 : 50, (% weight). Raw material NdFeB was made from the mixture of Nd, Fe and B with atomic ratio 2 :14 : 1 by using mechanical alloying technique. The blend of NdFeB and epoxy resin has been done in the vacuumbox . Sample test was prepared by compression with hydraulic press pressure 100kg/cm 2 within 2 minutes. Heattreatment in the oven with a temperature of 180 O C for 4 hours. The sample test was made in cylindrical shape witha diameter of 2-3 cm and thickness of 0.4 to 0.9 cm. The measurement of density vs. Histerisis has been recorded.The results show that the bonded NdFeB permanent magnets achieve optimum conditions in comparison NdFeB97% and 3% epoxy with the density = 4.49 g/cm3 and remanansi (Br) = 5.32 kG, HcJ = 7.936 kOe and (BH) max= 5.75 MGOe.

scholarly journals Preparation and Characterization of Continuous Fe-Containing Silicon Carbide Radar Absorbing Fibers from Precursor-Based Processing

2012 ◽  
Vol 6 (1) ◽  
pp. 34-38
Author(s):  
Zhiyan Chen ◽  
Jun Wang ◽  
Xiaodong Li ◽  
Hao Wang
Keyword(s):  
Silicon Carbide ◽  
Structural Material ◽  
Epoxy Resin ◽  
Raw Materials ◽  
Nitrogen Atmosphere ◽  
Ceramic Fibers ◽  
Heat Treated ◽  
Melt Spun ◽  
Amorphous Sic

A new polymer polyferrocarbosilane (PFCS) was synthesized using polydimethylsilane and ferrocene as the raw materials. The polymer was then melt-spun into continuous PFCS fibers, cured in air and heat-treated in a nitrogen atmosphere up to 1300􀀁, a kind of Fe-containing SiC fibers were finally obtained. The SiC(Fe) ceramic fibers were combined with epoxy resin and a structural material was prepared showing excellent radar absorbing properties. HRTEM, XRD and XPS were used to characterize the SiC(Fe) fibers. The results show that the fibers are composed of β-SiC, amorphous SiCxO4-x, free carbon and small amount of Fe3Si-like microcrystals. A carbon-enriched layer of about 120nm was formed on the surface of the fibers.

Preparation and characterization of sizable macroporous epoxy resin-based monolithic supports for flow-through systems

2009 ◽  
Vol 32 (15-16) ◽  
pp. 2608-2618 ◽  
Author(s):  
Anh Mai Nguyen ◽  
Ngoc Phuoc Dinh ◽  
Quach Minh Cam ◽  
Tobias Sparrman ◽  
Knut Irgum
Keyword(s):  
Epoxy Resin ◽  
Flow Through

THE EFFECT OF OXYGEN ADSORPTION ON THE CONDUCTIVITY OF PBTE FILMS.

2020 ◽  
Vol 6 (8(77)) ◽  
pp. 21-23
Author(s):  
S.N. Sarmasov ◽  
R.Sh. Rahimov ◽  
T.Sh. Abdullayev
Keyword(s):  
Spectral Region ◽  
Current Flow ◽  
Oxygen Adsorption ◽  
Tunneling Mechanism ◽  
Pn Junction ◽  
Flow Through ◽  
Pn Junctions ◽  
Effect Of Oxygen

The effect of oxygen adsorption on the conductivity of PbTe films is studied. Pn junctions based on PbTe films are photosensitive in the IR spectral region with a maximum photosensitivity of 𝜆𝑚𝑎𝑥 microns. The tunneling mechanism of current flow through the pn junction is shown.

Water Temperature Control Using PID Control System Based on LabVIEW

2016 ◽  
Vol 4 (2) ◽  
pp. 35-46
Author(s):  
Ari Ramadhani
Keyword(s):  
Water Temperature ◽  
Pid Control ◽  
Temperature Sensor ◽  
Pid Controller ◽  
Current Flow ◽  
Electrical Energy ◽  
Heating Process ◽  
Water Heater ◽  
Digital Thermometer ◽  
Flow Through

Abstract - Automatic system have grown widespread across all sector so do water heater. Traditionally, heating water is done by utilizing fire as heat source. As the growing of technology, the heating process could be done by manipulating electrical energy by convert it to heat. Electrical energy is flown to a metal rod that contact directly with the water which increase the water temperature. On some case, appropiate water temperature is needed. Altough, a thermometer is needed to read the actual temperature as a feedback value for the system and a system that can control the electricity current flow through the heater that the heat produced is linear to the current flow. With implementing microcontroller as a process node for generating PWM signal, this problem can be solved. Also, Labview is needed as an interface for monitoring and bursting an output which have been processed by Proportional, Integral, and Devivative (PID) controller to producing accurate and stable heat. Based on the results of testing, the system is able to provide a rapid response to any changes that occur, both changes in set-point and changes in water temperature (actual value). Another test is done by comparing the temperature value detected by the temperature sensor in this device with an external digital thermometer placed in the same place, and from some of the tests the temperature value detected by the temperature sensor in this device has a difference of ± 0.19 ℃ with a digital thermometer. Keyword : Water Heater, Thermometer, Microcontroller, LabView, PID.

Anti-oxidation of Epoxy Resin Conductive Adhesive Copper Powder

2013 ◽  
Vol 30 (6) ◽  
pp. 677 ◽  
Author(s):  
Shimei DAI ◽  
Guangshuai HAN ◽  
Caigang DU ◽  
Yanmin GAO
Keyword(s):  
Epoxy Resin ◽  
Copper Powder ◽  
Conductive Adhesive
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