期刊
MATERIALS RESEARCH EXPRESS
卷 5, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/aaa3b8
关键词
polymer matrix composite; graphene nanoplatelets (Gnp); mechanical properties; ablation rate
资金
- Hindustan Institute of Technology and Science
The present experiments have been conducted to investigate the thermal, ablation and mechanical properties of carbon/phenolic (C-Ph) composites loaded with zirconia (Zr) coated graphene nanoplatelets (Gnp) hybrid filler. The Zr/Gnp hybrid filler was synthesized by sol-gel technique and C-Ph composites were fabricated using hand layup method. The thermal stability was investigated by thermogravimetric analysis and it was significantly improved with the addition of Zr and Zr/Gnp hybrid filler to pure C-Ph composite. The ablative properties were studied under oxy-acetylene flame torch tests at a heat flux of 2100 kW m(-3). TheC-Ph/Zr/Gnp0.5 composite sample exhibited lower linear and mass ablation rates compared to pure C-Ph composite. The surface morphology of post-ablated composite samples was characterized by scanning electron microscopy. It was shown that the Zr/Gnp filler produced bubble-like structure around the C-fibers, which prevented the oxidation of fibers. Finally, the mechanical properties of C-Ph composites were investigated through three-point bending tests as per ASTMD7264 standard. The flexural strength and modulus of C-Ph composites loaded with hybrid filler increased about 30% and 54% compared to the pure C-Ph composite.
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