Conference Publications
Permanent URI for this collection
Browse
Recent Submissions
1 - 5 of 59
-
PublicationThe study of interfacial reaction between SnAgCu (SAC) lead-free solder alloys and copper substrate: a short review(IOP Publishing Ltd., 2020)This paper is aimed to review and study the interfacial reaction between SnAgCu (SAC) lead-free solder alloys and common copper substrates. Among the lead-free solders, a ternary solder alloys, SnAgCu (SAC) based solder, is leading the lead-free solders as it has excellent thermal and electrical properties. The interfacial between solder alloy and substrate comprise an important characteristic in the reliability performance of a solder alloy. As the current industry has driven to miniaturization, high integration and multifunctionality, the reliability and durability of solder joints are gained attention for its long-term performance of electronic products. Therefore, in this short review, the interfacial reaction between SAC solder alloys and copper substrate will be focused. Besides, the effects of the addition of microalloying elements into SAC solder alloys will be discussed.
-
PublicationEffect of Iron Oxide (Fe2O3) on the Properties of Fly Ash Based Geopolymer(IOP Publishing Ltd., 2020)Geopolymer is an attractive construction binder owing to its ability to improve the properties of the concrete and preserves the environment from the high CO2 emission. Geopolymer technology will convert the potential hazardous industrial waste such as fly ash into valuable construction materials. However, there is a need of studying the properties of iron-based geopolymer in order to enhance the fundamental and knowledge of the geopolymer research also development in this study area. Fly ash which contains a significant amount of iron oxide (Fe2O3) was used as a precursor and tested at different curing duration (1, 3, 7, 14 and 28 days). Crystallization of iron oxide (Fe2O3) contained in the fly ash under geopolymerization process will be able to turn waste fly ash into a strong concrete materials, simultaneously creating a waste-to-wealth economy. Furthermore, the formation of fayalite detected from the microstructure characterization is mainly contribute to the strength development of the fly ash after 28 days curing.
-
PublicationReliable method and multistage process involved in the production of activated carbon based on raw material-a systematic review(IOP PUblishing Ltd., 2020)Activated carbon AC) has versatile usage in the modern days for water treatment, air filtration and for multipurpose adsorption. Carbonaceous material with highly developed porosity known as AC after some process took place. AC also known as artificial materials characterized by the high surface area and the extensive surface chemistry. Significant adsorptive properties of the materials according to extensive surface chemistry which are responsible for the surface properties. Nowadays, AC are widely used in a large range of applications, for example medical uses, catalysis, gas storage, removal of pollutants and odors, gas separation and purification. Important Character for based materials of AC, it must accessible, affordable price, and with valorization potential in agricultural residues and industrial base. The most important raw materials for the production of AC is lignocellulosic materials. Over the time researcher around the world conducting research to improvised and perfecting the method for producing the AC. The aim of this paper is to critical review the reliable method for AC production. The process involved in the production of activated were pre-carbonization process (PCP), carbonization process (CP), and activation process (AP). Carbonization either using furnace or microwave. For AP, there are two main activation used namely chemical activation CA) and physical activation (PA). However there also combination of chemical and physical activation which called physiochemical activation (PCA).
-
PublicationInfluence of Co and Zr content on creation of Crystalline phases in rapidly-cooled, injection-cast alloys Fe70Zr8-xCoxNb2B20 (where x=0, 2, 4, 6 or 8)(Jagiellonian University, 2020)Rapid solidification techniques allow the manufacture of nanocrystalline alloys using a single-stage production process. There is an issue with the reproducibility of this process. However, careful selection of the chemical composition of the alloy allows a degree of control over the process. This paper presents the results of investigations into the structure and magnetic properties of rapidly-quenched alloys based on Fe. For these investigations, alloys with the compositions of Fe70Zr8-xCoxNb2B20(where x = 0, 2, 4, 6, or 8) were selected. The alloys were made using an injection-casting method. The structure of the obtained alloys was investigated using X-ray diffractometry. Utilising dedicated software, the crystalline phases within the volume of the samples were identified - as the magnetic phases of Fe23B6, αFe, and Fe2B. The magnetic properties of the produced alloys were determined on the basis of measurements of the magnetic polarisation curves as a function of temperature, and the static hysteresis loops. The thermomagnetic curves confirmed the existence of the Fe23B6phase within the volume of two samples. The values of the saturation magnetisation and coercive field were determined from the static hysteresis loops. The alloys in which the presence of the Fe23B6phase was detected (alloy compositions Fe70Zr4Co4Nb2B20and Fe70Zr2Co6Nb2B20) were found to exhibit soft magnetic properties. A progressive decline in the presence of the Fe2B phase within the investigated alloys was observed with increasing Co content (at the expense of Zr content). On the basis of the performed investigations, the major influence of the Co and Zr content on the creation process of the crystalline phases, during the rapid solidification process was confirmed.
-
PublicationThe influence of heat treatment on the magnetic properties of the alloy Fe62Co10Y8B20 produced by the injection suction casting method(Jagiellonian University, 2020)The paper presents studies of annealing effect on the magnetic properties of the bulk Fe62Co10Y8B20alloy in the form of rods. The thermal treatment was performed at the temperature well below the crystallization temperature. Structure, revealed by X-ray diffraction and Mössbauer spectroscopy and magnetic properties in high magnetic fields in the Fe62Co10Y8B20alloy after fabricated and after the annealing were studied. We have stated that the investigated alloy was fully amorphous. It is due to the stress relieving of the sample. Using a vibrating sample magnetometer the magnetization in high magnetic fields was studied. For both the sample after solidification and after heat treatment, the magnetization process in the area called "the approach to ferromagnetic saturation" is affected by free volumes. In addition, the heat treatment improved the magnetic properties and increased the packing density of atoms.