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Reinforcements and Matrices for Polymer Matrix Composites
Published in Manoj Kumar Buragohain, Composite Structures, 2017
For the composites engineer, on the shop floor, characteristics of the uncured resin system are of primary concern. From this angle, physical form, viscosity, pot life, cure characteristics, shelf life, storage condition, etc. need to be considered. Commonly, epoxy resins are available as liquids, powders, flakes, semisolid paste, etc. Resins in a solid or semisolid form are inconvenient to process as a laminating system. The process of mixing the resin and hardener to prepare the resin system varies and the details can be obtained from the manufacturer. Generally, resins and hardeners in solid/semisolid form are heated to a higher temperature and the molten materials are mixed at the specified ratio. Also, at times, the resin mix is kept at elevated temperature so as to maintain the melt viscosity within limit. Highly viscous resins are not suitable for composites processing as it leads to nonuniform/inadequate wetting of the reinforcements.
Influence of various trace metallic additions and reinforcements on A319 and A356 alloys—a review
Published in Cogent Engineering, 2022
D Srinivas, Gowrishankar M C, Pavan Hiremath, Sathyashankara Sharma, Manjunath Shettar, Jayashree P K
Among many alloy preparation techniques, spray forming is treated as a potential and advanced technique to increase ductility. Otani et al. (2019) observed that spray-formed deposits performed by hot swaging resulted in high ductility and hence offer possibilities for various applications. Robles Hernández and Sokolowski (2009) used the electromagnetic treatment on A319 alloy by varying the range of magnetic field (alternating current). They found that Cu phase, dendritic size, and grain size are sensitive for this stirring modification. Positive changes were observed by using this technique, but no significant modification was seen in Al-Si eutectic. Billet casting is also used as one of the techniques to produce matrix alloys (Lombardi et al., 2015). Semi-solid metal processing is gaining importance because it can produce near net-shaped products with better properties compared to conventional methods. Thixoforming is a semi-solid metal processing method where two steps are to be performed viz., preparing a feedstock material and heating to forming temperature (Alhawari et al., 2017). Thixoforming helps in enhancing corrosion properties and getting coarser microstructure of Al alloys (L. Wang et al., 2016).