“…Note that despite the lower strength values obtained for these Al/basalt composites as compared to some basalt fiber reinforced polymers, 10 the relatively high temperature capability of these newly developed MMCs makes them appropriate to be considered as candidates for some engineering applications where polymer matrix composites cannot withstand the service temperatures. 12 Figure 13.Optical micrographs of Al/basalt composite: (a) longitudinal and (b) transverse sections.Figure 14.The variation of ultimate tensile strength of Al/basalt composites with fiber content.Figure 15.Scanning electron microscope (SEM) micrographs of fractured surface of Al/basalt composite: (a) longitudinal and (b) transverse sections.Figure 16.The variation of fracture strength of Al/basalt composites with fiber content.…”
This study, for the first time investigates the applicability of basalt fiber as a reinforcing material for metal matrix composites through various experimental works for thermal stability and mechanical properties. The residual tensile strength values of basalt fibers after being exposed at different temperatures in a furnace for pre-determined times and/or after being immersed into molten aluminum for different lengths of time were evaluated. Throughout these experimental studies, a processing method for fabrication of these composites was optimized. In this method, basalt preforms were coated with a thin layer of aluminum by immersion into aluminum melt for a short period of time. These laminates were stacked in a mold and consolidated by hot pressing (300℃, 7 min and 630 MPa). The microstructural studies confirmed a good bonding between aluminum and basalt together with a reasonably uniform distribution of fibers within the matrix alloy. Scanning electron microscopy studies revealed the fractured basalt fibers in the matrix alloy as well as occasional improper infiltration of the matrix alloy into the fiber bundles. Consequently, the mechanical properties of aluminum/basalt composites were far inferior to those expected by law of mixtures predictions. However, the strength values of these newly developed metal matrix composites are still adequate for some engineering applications.
“…Note that despite the lower strength values obtained for these Al/basalt composites as compared to some basalt fiber reinforced polymers, 10 the relatively high temperature capability of these newly developed MMCs makes them appropriate to be considered as candidates for some engineering applications where polymer matrix composites cannot withstand the service temperatures. 12 Figure 13.Optical micrographs of Al/basalt composite: (a) longitudinal and (b) transverse sections.Figure 14.The variation of ultimate tensile strength of Al/basalt composites with fiber content.Figure 15.Scanning electron microscope (SEM) micrographs of fractured surface of Al/basalt composite: (a) longitudinal and (b) transverse sections.Figure 16.The variation of fracture strength of Al/basalt composites with fiber content.…”
This study, for the first time investigates the applicability of basalt fiber as a reinforcing material for metal matrix composites through various experimental works for thermal stability and mechanical properties. The residual tensile strength values of basalt fibers after being exposed at different temperatures in a furnace for pre-determined times and/or after being immersed into molten aluminum for different lengths of time were evaluated. Throughout these experimental studies, a processing method for fabrication of these composites was optimized. In this method, basalt preforms were coated with a thin layer of aluminum by immersion into aluminum melt for a short period of time. These laminates were stacked in a mold and consolidated by hot pressing (300℃, 7 min and 630 MPa). The microstructural studies confirmed a good bonding between aluminum and basalt together with a reasonably uniform distribution of fibers within the matrix alloy. Scanning electron microscopy studies revealed the fractured basalt fibers in the matrix alloy as well as occasional improper infiltration of the matrix alloy into the fiber bundles. Consequently, the mechanical properties of aluminum/basalt composites were far inferior to those expected by law of mixtures predictions. However, the strength values of these newly developed metal matrix composites are still adequate for some engineering applications.
“…As far as chemical resistance is concerned, basalt filaments present a superior resistance against alkaline environment with respect to glass fibers, while relatively less stability has been registered in strong acids. [17][18][19] In the last decades, basalt fibers were extensively applied as geo-polymeric concretes, 20 pressure pipes, 21 fibrous insulators, 22 protective clothes [20][21][22][23][24] and fire blocking material, 15,25 and more recently as a reinforcement for polymer composites. [26][27][28][29][30][31][32][33][34][35][36][37][38][39] For as the development of hybrid composites is concerned, basalt fibers were successfully combined with traditional reinforcements, such as glass, 40 carbon, 41,42 aramid 43 and nylon 44 fibers.…”
Basalt and E-glass fibers fabrics were combined with carbon fiber fabrics in order to prepare epoxy-based interlaminar hybrid composites and to investigate the hybridization effect on the flexural and impact properties of the resulting laminates. The flexural modulus of the composites depended on their composition according to a rule of mixture, while an important synergistic effect was detected for the ultimate flexural properties. Charpy impact tests evidenced a strength increase as basalt and glass fibers content increased. Interestingly, hybridization with basalt fibers promoted an increase of the adsorbed impact energy due to an enhancement of the fracture propagation component.
“…Compared to glass fibers, BFs are characterized by an elevated resistance against alkaline environment, while relatively less stability has been registered in strong acids. [9][10][11] Because of the elevated hardness (from 5 to 9 on Mohr's scale), BFs are characterized by elevated abrasion properties. Due to their excellent thermal properties, BFs can be exposed for hours at 1100-1200 C without any physical damage.…”
Fabrics of basalt (BFs), E-glass (GFs), and carbon (CFs) fibers with the same areal density were used to prepare epoxy-based laminates. The BF laminates presented elastic moduli and strength values higher than those of the corresponding GF laminates, with tensile strength values near to that of CF laminates. Investigation of the behavior under fatigue conditions indicated superior performances of BF laminates with respect to the corresponding GF composites, with an improved capability of sustaining progressive damaging and slightly higher damping properties. As far as the fatigue behavior is concerned, BFs may therefore represent a valid substitute of GFs in structural composites.
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