Soil Chemical Analysis

Friction stir welding/processing of metals and alloys: A comprehensive review on microstructural evolution

Recent progress on control strategies for inherent issues in friction stir welding

Friction stir based welding and processing technologies - processes, parameters, microstructures and applications: A review

Friction stir welding/processing (FSW/P) involving temperature, mechanics, metallurgy and interaction, is a complex solid state joining and processing technology. FSW has been widely applied to join aluminum alloy, titanium alloy and other materials which are difficult to weld by fusion welding. The last scientific study states that FSW has potential to join thermoplastic polymers and polymer matrix composites. In this review, current understanding and development about FSW of thermoplastic polymers and polymer matrix composites, multifunctional composites fabrication as well as dissimilar FSW of metal and polymer are reviewed. Future scientific research and engineering development related to FSW/P of thermoplastic polymers and polymer matrix composites are identified.

Friction stir welding/processing of polymers and polymer matrix composites

Surface composites by friction stir processing: A review

Friction stir processing (FSP) is an important technique for preparing surface composites. Fabricating defect-free surface composites with uniform particle distribution by FSP is a challenging task. In this study, silicon carbide particles reinforced AA5083 alloy surface composites was fabricated using different FSP strategies including variation in process parameters, dual-tool processing and tool offset overlapping. Material flow of the processed material with reinforcement particles demonstrated that the distribution of particles was influenced by the stirring action of the probe as well as the extrusion of the plasticized material due to the movement of the tool. Process parameters, particularly rotational speed, showed a dominant influence on the distribution of silicon carbide particles.

Friction Stir Processing Strategies for Uniform Distribution of Reinforcement in a Surface Composite

The present investigation aims to find the combined effect of coarse and fine size particle reinforcement of zircon sand in aluminum alloy LM13 on the wear behavior. The composites are fabricated by varying the reinforcement of fine and coarse size zircon sand particles and compared with the single size reinforcement. Coarse and fine particle zircon sand of 106–125 and 20–32-μm size, respectively, are used in this study. The wear test was carried out on pin-on-disc machine. Microhardness measurement was done for developed composites. Wear track and debris are analyzed by SEM to study the wear mechanism. Line profile and EDS analysis is also done to validate the microstructural results. Study reveals that a combination of 3 % fine and 12 % coarse particle reinforced composite exhibits better wear resistance while 3 % coarse and 12 % fine particle reinforcement decreases the wear resistance. It is also observed that zircon sand particles provide effective nucleation site for the eutectic silicon. Microstructural examination shows globular and finely distributed eutectic silicon in the vicinity of the reinforced particles.

Wear Behavior of Dual Particle Size (DPS) Zircon Sand Reinforced Aluminum Alloy

Oral delivery is currently the gold standard in the pharmaceutical industry where it is regarded as the safest, most convenient and most economical method of drug delivery having the highest patient compliance. Fast dissolving tablets (FDTs) have received ever-increasing demand during the last decade, and the field has become a rapidly growing area in the pharmaceutical industry. Upon introduction into the mouth, these tablets dissolve or disintegrate in the mouth in the absence of additional water for easy administration of active pharmaceutical ingredients. The popularity and usefulness of the formulation resulted in development of several FDT technologies. Fast- or mouth dissolving tablets have been formulated for pediatric, geriatric, and bedridden patients and for active patients who are busy and traveling and may not have access to water. This review describes the various formulation aspects, disintegrants employed and technologies developed for FDTs, patent formulation, evaluation tests, and marketed formulations.

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A comprehensive review on fast dissolving tablet technology

The present investigations are a comparative study of single and dual reinforcement particles on microstructural features and wear behavior in LM-13 aluminum–silicon alloy. Silicon carbide and zircon sand particles of 20–32 μm are reinforced in the alloy by two-step stir casting method. Wear study reveals that the dual particle reinforcement enhances the wear resistance as compared to single particle reinforcement if mixed in a definite proportion. Study also indicate that a combination of 15 % reinforcement of zircon sand and silicon carbide particles in the ratio of 1:3 into the composite exhibits better wear resistance as compared to other combination.

Vipin Sharma

Papers

Surface composites by friction stir processing: A review

Friction Stir Processing Strategies for Uniform Distribution of Reinforcement in a Surface Composite

Wear Behavior of Dual Particle Size (DPS) Zircon Sand Reinforced Aluminum Alloy

A comprehensive review on fast dissolving tablet technology

Microstructural and wear behavior of dual reinforced particle (DRP) aluminum alloy composite