Addressing Bioprinting Challenges in Tissue Engineering
Synthesis of Zinc Oxide Nanoflower using Egg Shell Membrane as Template
In Vitro and in Vivo Experiment of Antibacterial Silver Nanoparticle-Functionalized Bone Grafting Replacements
Biocompatibility in Orthopedic Implants: Advancements and Challenges
Contemporary Approaches towards Emerging Visual Prosthesis Technologies
An Investigation on Recent Trends in Metamaterial Types and its Applications
A Review on Plasma Ion Nitriding (PIN) Process
Comparative Parabolic Rate Constant and Coating Properties of Nickel, Cobalt, Iron and Metal Oxide Based Coating: A Review
A Review on Friction and Wear Behaviors of Brake’s Friction Materials
Electro-Chemical Discharge Machining- A review and Case study
Electrical Properties of Nanocomposite Polymer Gels based on PMMA-DMA/DMC-LiCLO2 -SiO2
Comparison Of Composite Proton Conducting Polymer Gel Electrolytes Containing Weak Aromatic Acids
Enhancement in Electrical Properties of PEO Based Nano-Composite Gel Electrolytes
Effect of Donor Number of Plasticizers on Conductivity of Polymer Electrolytes Containing NH4F
PMMA Based Polymer Gel Electrolyte Containing LiCF3SO3
Electrically Conductive Adhesives (ECAs) are widely applied in electronic packaging such as solder less interconnections, heat dissipation and component repair. This research focuses on the effects of polyaniline filler percentage in the silver-polyaniline epoxy conductive adhesive. Conductive adhesives with different polyaniline filler concentrations were prepared, so as to check on how the different filler concentrations affect the shear strength of the ECAs. Silver concentration was kept constant, but the polyaniline concentration was varied between 3-10%. The shear strength of the adhesive was measured using the universal tensile machine and the results showed that, more the filler loading is increased, less the adhesive strength exhibited by the composite. The research also shows the synthesis of the main filler silver particles by chemical reduction method and also the synthesis of the co-filler polyaniline by chemical method and both UV (Ultraviolet) and SEM (Scanning Electron Microscope) characterizations were conducted.
In this investigation, the effect of post heat treatment on the microstructure and mechanical properties of IS2062 steel are analyzed. Similar metal joints of IS2062 weldments are prepared by using MIG (Metal Inert Gas) welding process. This melting is occurring at the edges of the plates because, sufficient amount of heat energy is passing over the plate per unit time and density of energy is supplied to the wire. In this connection of heating and cooling of weldment, some disturbances occur in metallurgical and mechanical point of view. To overcome this, a suitable PWHT (Post Weld Heat Treatment) is applied to avoid the disturbances and improve the mechanical and microstuctre of the weldment. The objective is to determine the optimum PWHT method for the IS2062 steel. After welding, the effects of PWHT on weld metal microstructure and mechanical properties including weldment tensile strength, impact and hardness over the room temperature range of 32oC are investigated. In particular, the effect of these treatments on the Tensile strength, Impact, Hardness of the materials and weldments before heat treatment and after PWHT are studied.
Bituminous pavements are commonly used for construction of roads in our country. Hot Mix Asphalt (HMA) is majorly adopted in the preparation of bituminous mixes. HMA releases harmful gases and pollutes the environment. Several techniques have been developed for reducing the mixing and compaction temperatures of HMA. One of the techniques is named as Warm Mix Asphalt (WMA) for reduction in mixing temperature. WMA mixes contribute for cost savings in operation of bitumen plants through reduction in energy costs. Pavement deformation is the major problem and is observed on high volume bituminous roads. Many researchers have given their contribution for improving the pavement life for the cause rutting failure. An attempt has been made for improving the rutting characteristics obtained with the addition of Polyester (PE) fibers, at regular intervals. Parameters such as bulk density, Voids in Mineral Aggregate (VMA), Void Filled with Bitumen (VFB), air voids, flow and stability were determined as per ASTM D 1559 and Optimum Binder Content (OBC) was determined as per Ministry of Road Transport and Highway (MoRTH) 5th revision 2013 guidelines. WMA prepared with bituminous concrete grade – I (MoRTH) was considered for the study and was modified with Polyester (PE) fibers. Performance characteristics of PE modified mix are carried with immersion type of wheel tracking device for evaluation of rut depth. It is observed from the results that, WMA provides lower rut depth with increase in PE fiber content at optimum content when compared with conventional WMA mix.
Austempered Ductile Iron (ADI) in the recent past has established itself as a versatile material for engineering applications with its wide range of tensile strength, yield strength ranging from 850 MPa to 1600 MPa and elongation ranging from 1 – 10 %. The wear performance of ADI is achieved through the special heat treating process on a commercially produced ductile iron with high Manganese (Mn) content which is a characteristic of the ductile iron produced in commercial Indian foundries. The present work shows the ability of ADI produced from commercial grade ductile iron with Mn content as high as 0.22 %, to be used as wear resistant material and the effect of austempering time and temperature on wear behavior of ADI is studied. Wear tests were performed on a pin on disc wear, friction monitoring machine at loads of 20 Newtons (N), 60 N and 80 N for a fixed interval of time (120 min). For better comparison, different grades of ADI are produced by austempered the samples at four different scales of temperatures 250oC, 300oC, 350oC and 400oC for different periods of time 30 minutes (min), 60 min, 90 min corresponding to each temperature respectively. In this paper, attempt has been made to correlate the wear properties of ADI with wear load and heat treatment conditions. Final part of the research work aims at studying the effect of austempering temperature and time on the wear characteristics of ADI. Wear loss (mg) decreases with increase in austempering time, because at the higher austempering time retained, austenite content is higher and as the temperature is increased, wear loss from the sample increases due to decrease in hardness. Wear loss (mg) at higher load (N) is more due to increase in normal reaction, thus friction.
In aerospace applications, materials with high strength to weight ratios along with properties such as excellent corrosion resistance, light weight, creep resistance and high thermal strength are needed. Also cost parameters need to be considered without compromising with quality. In accordance with the properties required; aluminium, titanium, magnesium, nickel and their alloys are mostly used in aerospace industries for making most of its sub components. In this paper, a detailed review has been presented on Al based alloy used in making aircraft structures and components. The characteristics of metallic components for aircraft seats are discussed. It has been found that, the aluminum alloys are the major contributors for aircraft components. The aluminium alloys (2xxx, 6xxx, 7xxx and 8xxx) are found to be the prominent ones. Among these, the 8xxx series is widely used due to its low density.
