Effect of fiber content on the microstructure and mechanical properties of carbon fiber felt reinforced geopolymer composites

Yan, Shu; He, Peigang; Jia, Dechang; Yang, Zhihua; Duan, Xiaoming; Wang, Shengjin; Yu, Zhou

doi:10.1016/j.ceramint.2016.01.197

Cited by 69 publications

(21 citation statements)

References 13 publications

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“…The amount of macrodefects generated by the process could be controlled to a limited extent through chemical (e.g., alkalinity, liquid-to-solid ratio) and physical conditions (e.g., humidity) in curing [33,34,35]. Alternatively, the production of composites from a geopolymeric matrix was extensively investigated as an effective solution to increase the fracture toughness, due to the mechanisms of pull-out and crack bridging of dispersed fibers [36,37,38,39,40]. Above all, cellulose seems to be suitable for geopolymer composites due to its chemical stability and specific tensile strength [41,42,43].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Performance of Glass-Based Geopolymer Matrix Composites Reinforced with Cellulose Fibers

2018

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Glass-based geopolymers, incorporating fly ash and borosilicate glass, were processed in conditions of high alkalinity (NaOH 10–13 M). Different formulations (fly ash and borosilicate in mixtures of 70–30 wt% and 30–70 wt%, respectively) and physical conditions (soaking time and relative humidity) were adopted. Flexural strength and fracture toughness were assessed for samples processed in optimized conditions by three-point bending and chevron notch testing, respectively. SEM was used to evaluate the fracture micromechanisms. Results showed that the geopolymerization efficiency is strongly influenced by the SiO2/Al2O3 ratio and the curing conditions, especially the air humidity. The mechanical performances of the geopolymer samples were compared with those of cellulose fiber–geopolymer matrix composites with different fiber contents (1 wt%, 2 wt%, and 3 wt%). The composites exhibited higher strength and fracture resilience, with the maximum effect observed for the fiber content of 2 wt%. A chemical modification of the cellulose fiber surface was also observed.

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Section: Introductionmentioning

confidence: 99%

Mechanical Performance of Glass-Based Geopolymer Matrix Composites Reinforced with Cellulose Fibers

2018

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“…This indicates that composites showed obvious brittle fracture behavior [ 42 ]. As fiber content increased, sample fracture occurred after a larger displacement, meaning that the pseudoplasticity of the composites improved [ 43 ]. This pseudoplasticity is attributed to the good bonding of MF to the HA matrix.…”

Section: Resultsmentioning

confidence: 99%

Sintering Behavior and Mechanical Properties of Mullite Fibers/Hydroxyapatite Ceramic

et al. 2018

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The effect of fiber content and sintering temperature on sintering behavior and mechanical properties of mullite fibers/hydroxyapatite composites was studied. The composites were fabricated by hydrothermal synthesis and pressureless sintering. The amount of fibers was varied from 5 wt % to 15 wt % through hydrothermal synthesis, mullite fibers and hydroxyapatite composite powders were subsequently sintered at temperatures of 1150, 1250, and 1350 °C. The composites presented a more perturbed structure by increasing fiber content. Moreover, the composites experienced pore coalescence and exhibited a dense microstructure at elevated temperature. X-ray diffraction indicated that the composites underwent various chemical reactions and generated silicate glasses. The generation of silicate glasses increased the driving force of particle rearrangement and decreased the number of pores, which promoted densification of the composites. Densification typically leads to increased hardness and bending strength. The study proposes a densification mechanism and opens new insights into the sintering properties of these materials.

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“…Unfortunately, the carbon fibre sizing has made it difficult to apply the A-matrix to the surface of the fiber reinforcement; therefore, many authors removed it in various ways. Yan et al [24] washed the carbon fibers by an ultrasonic vibrator in acetone and then dried them in oven at 60 °C for 5 h. Lin et al [25] separated the short carbon fibers by an ultrasonic vibrator in ethanol, then the fibers were filtered out by a wire sieve to get sheet-like short carbon fiber preforms with a thickness in the range of 0.15–0.2 mm. Yuan et al [26] treated the fibers at 370 °C in air atmosphere for 2 h.…”

Section: Introductionmentioning

confidence: 99%

Prepregs for Temperature Resistant Composites

2019

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In this paper, carbon fabric reinforced inorganic matrix composites were prepared. The inorganic matrix based on alkali activated aluminosilicate was used because of its resistance to fire and the temperatures up to 1000 °C. Influence of heat treatment of fabric, high temperature treatment of composite and preparation method on the mechanical properties and morphology of the composites were studied. The preparation of composites with the subsequent steps of impregnation, layering and curing of the composites was compared with the prepreg preparation method, which separates the impregnation of the reinforcement from the production of the composite. The SEM photographs show no differences in morphology between composites prepared from heat treated fabric and composites prepared from original fabrics. All four series of samples were comparatively saturated with matrix. Despite this, tensile properties of heat-treated fabric composites were negatively affected. While composites with heat-treated fabric reached the tensile strength up to 274 MPa, composites prepared without heat-treated fabric exhibited strengths higher than 336 MPa. Samples exposed to temperatures reaching 600 °C retained up to 40% of their original strength. The effect of composite preparation method on the tensile properties of the composites has not been proved.

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Effect of fiber content on the microstructure and mechanical properties of carbon fiber felt reinforced geopolymer composites

Cited by 69 publications

References 13 publications

Mechanical Performance of Glass-Based Geopolymer Matrix Composites Reinforced with Cellulose Fibers

Mechanical Performance of Glass-Based Geopolymer Matrix Composites Reinforced with Cellulose Fibers

Sintering Behavior and Mechanical Properties of Mullite Fibers/Hydroxyapatite Ceramic

Prepregs for Temperature Resistant Composites

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