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Preparation And Characterization Of Nickel Based Nanocomposite Coatings With Enhanced Mechanical And Surface Properties, Malay Kumar Das
Preparation And Characterization Of Nickel Based Nanocomposite Coatings With Enhanced Mechanical And Surface Properties, Malay Kumar Das
Chulalongkorn University Theses and Dissertations (Chula ETD)
Ni-W alloy and Ni-W/diamond monolayer and multilayer composite coatings were prepared by electrodeposition from a Ni-W plating bath with diamond particles suspended into the bath. Ni-W/diamond composite coatings were also prepared with varying amounts of Cobalt sulphate additives. The morphology and the composition of the deposits was investigated by means of SEM and EDS, respectively. The effect of operating conditions and additives on the Ni-W coatings were analyzed. The effect of the plating parameters, composite particle size, multilayer deposits and cobalt additives on microstructure and mechanical properties of the Ni-W/diamond composite coatings was investigated. The electrodeposited Ni-W/diamond deposits reported a …
Preparation Of Graphene Nanocomposites For Anticorrosion And Sensors, Nadtinan Promphet
Preparation Of Graphene Nanocomposites For Anticorrosion And Sensors, Nadtinan Promphet
Chulalongkorn University Theses and Dissertations (Chula ETD)
This dissertation focused on the development of graphene (GO) nanocomposite coating to improve various substrate properties for the sensor application, which is divided into 2 main parts. The first part is the development of GO incorporated into electroless nickel phosphorus (NiP) coating to improve the properties of metal for electrochemical sensor application. Nickel phosphorus - titanium dioxide sol - reduced graphene oxide (NiP-TiO2 sol -RGO) coated surface was successfully prepared by one-pot electroless deposition on the steel substrate. The results show that the homogeneously formation of water-repellent RGO film covering on the coated surface leading to improve the corrosion resistance …
Thermal Stability Characterization Of Tunneling Magneto Resistive Structure For Data Storage Applications, Pornchai Rakpongsiri
Thermal Stability Characterization Of Tunneling Magneto Resistive Structure For Data Storage Applications, Pornchai Rakpongsiri
Chulalongkorn University Theses and Dissertations (Chula ETD)
The conventional read sensor technology used in hard disk drives is the tunneling magneto resistive (TMR) device. The revolutions of technology have been developed to achieve high performance of reading signal resulting in very thin and complicated device layers which thermal induced degradation and defects would be concerned. In this research, a thermal stress has been applied to TMR devices between 150-250 ℃ for reliability investigation. The resistance, amplitude and asymmetry parameters, before and after the thermal stress, were measured using a quasi-static tester (QST). The results showed the temperature dependence of the percentage change in QST resistance, asymmetry and …