Study on preparation and properties of carbon nanotubes/hollow glass microspheres/epoxy syntactic foam

2017 ◽  
Vol 37 (1) ◽  
pp. 93-98 ◽  
Author(s):  
Xingguo Zhang ◽  
Bin Ya ◽  
Bingkun Huang ◽  
Bingwen Zhou ◽  
Leizhen Pei ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Water Absorption ◽  
Salt Water ◽  
Syntactic Foam ◽  
Inorganic Ions ◽  
Testing Time ◽  
Glass Microspheres ◽  
Hollow Glass Microspheres ◽  
Multiwalled Carbon ◽  
Hollow Glass

Abstract Hollow glass microspheres (HGMs)/epoxy syntactic foam reinforced by multiwalled carbon nanotubes (MWCNTs) was prepared in this study. The effect of MWCNTs on the density, mechanical properties and water absorption of HGMs/epoxy syntactic foam was investigated. Because of the low density and low content of MWCNTs, the density of HGMs/epoxy syntactic foam does not change much with adding MWCNTs. In addition, the compression strength of HGMs/epoxy is enhanced by 17–25% when adding 0.3 wt% MWCNTs. The fracture surfaces of specimens were examined with scanning electron microscopy (SEM), and results indicated that the bridging effect of MWCNTs is the reinforcement mechanism. Analyzing the water absorption testing results, it is concluded that MWCNTs may decrease the water absorption content due to the hydrophobicity. Bigger inorganic ions in salt water could prevent the water diffusion, which results in a decrease of water absorption. In addition, the water absorption rate decreases with the extension of testing time.

scholarly journals Tensile and Compressive Behaviour of Hollow Glass Microspheres Reinforced LM13 Aluminum Alloy Based Syntactic Foam

2020 ◽  
Vol 8 (5) ◽  
pp. 2441-2445
Keyword(s):  
Aluminium Alloy ◽  
Syntactic Foam ◽  
High Strength ◽  
Stir Casting ◽  
Glass Microspheres ◽  
Hollow Glass Microspheres ◽  
Hollow Glass ◽  
Compressive Behaviour ◽  
Compound Materials ◽  
Composite Samples

Aluminium compound materials saw to be the best choice with its exceptional utmost of sketching out the material to give required properties. Aluminium alloy composites are expanding broad affirmation for aeronautics application in perspective on their high strength combined with low density. In the present work, an endeavour is made to prepare and focus the tensile and compressive behaviour of Hollow Glass Microspheres (HGM) reinforced Aluminium alloy LM13 based syntactic foam. Stir casting method was used to manufacture the aluminium alloy LM13 based syntactic foam with hollow glass microspheres (HGM) as space holders in 10 v%, 15 v% and 20 v% of concentration. Based on ASTM benchmarks, the composite samples were prepared. Results indicate that there is notable improvement in compressive strength while the tensile strength is on the lower side when observed in reference to the unreinforced LM13 alloy.

Effects of silane coupling agent modifications of hollow glass microspheres on syntactic foams with epoxy matrix

2021 ◽  
pp. 096739112110467
Author(s):  
Rui Li ◽  
Guisen Fan ◽  
Peng Wang ◽  
Xiao Ouyang ◽  
Ning Ma ◽  
...  
Keyword(s):  
Water Absorption ◽  
Coupling Agent ◽  
Coupling Agents ◽  
Syntactic Foams ◽  
Silane Coupling Agents ◽  
Glass Microspheres ◽  
Hollow Glass Microspheres ◽  
Hollow Glass ◽  
Silane Coupling ◽  
The One

A syntactic foam was prepared from an epoxy resin matrix and modified hollow glass microsphere fillers. Modification by silane coupling agents with different molecular structures was analyzed, and the optimal content of the silane coupling agent was determined. The results demonstrated that all silane coupling agents enhanced the adhesion between the hollow glass microspheres and epoxy resin matrix, resulting in enhanced water absorption, compressive performance, tensile performance, and bending performance compared to those prepared using unmodified hollow glass microspheres. Among silane coupling agents with different end groups, the one with a sulfhydryl end group exhibited optimal modification for hollow glass microspheres. Among the silane coupling agents with different backbone structures, the one with silanol groups exhibited the optimal modification of hollow glass microspheres. Additionally, the performance of the syntactic foams was optimal when 6% of the silanol-containing coupling agent was used. The results demonstrated that syntactic foams prepared with hollow glass microspheres modified by silane coupling agents exhibited improvements in water absorption, compressive performance, tensile performance, and bending performance, compared with those prepared using unmodified hollow glass microspheres. Among silane coupling agents with different end structures, the one with a sulfhydryl group as end group showed the best modification effect on hollow glass microspheres. The water absorption was 0.35%, the compressive strength was 62.15 MPa, the tensile strength was 40.15 MPa, and the bending strength was 53.17 MPa. Among silane coupling agents with different backbone structures, the one with silanol groupsbonds showed the best results. Its compressive strength was up to 64.15 MPa, the tensile strength was 35.47 MPa, and the bending strength was 53.99 MPa.

scholarly journals Hollow Glass Microspheres Filled Aluminum Syntactic Foam Made Through Stir-Casting Technique

2020 ◽  
Vol 9 (4) ◽  
pp. 261-266
Keyword(s):  
Aluminium Alloy ◽  
Volume Fraction ◽  
Syntactic Foam ◽  
High Strength ◽  
Stir Casting ◽  
Compressive Deformation ◽  
Glass Microspheres ◽  
Hollow Glass Microspheres ◽  
Hollow Glass ◽  
Casting Technique

Hollow Glass Microspheres (HGM) in the range of 10–20 vol. % were used as space holders for making syntactic aluminum foam having density 2.28–2.49 gm/cc using stir-casting technique. Aluminium alloys have already established their exceptional ability to sketch out the material for required properties. Aluminium alloy and its composites are one of the widely used materials for aeronautics and marine applications where high strength is expected from a low density material. So, an effort is made to enhance this lightness of aluminium alloy LM13 without affecting its strength by reinforcing it with Hollow Glass Microspheres (HGM). This synthesized syntactic foam, was characterized in terms of density and compressive deformation behaviour. It was noted that the syntactic foam behaves like a high strength aluminium foam under compressive deformation exhibiting flat plateau region in the stress–strain curves. The plateau stress of syntactic foam decreases with Hollow Glass Microspheres volume fraction vis-à-vis porosity.

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