Nanographite platelets (NGPs) are used as multi-functional fillers to develop cementitious composites because the unique carbon-carbon hexagonal plane structure makes NGPs have excellent mechanical, electrical, dielectric and thermal properties. In this paper, cementitious composites filled with NGPs are fabricated to investigate the effect of NGPs on mechanical, thermal and electromagnetic properties of cementitious composites. Experiment results show that the addition of NGPs can effectively modify the above-mentioned properties of cementitious composites. When the content of NGPs reaches 5%, the hardness of the composites increases 1.5-fold, the abrasive loss per unit area of the composites reduces by 71%, the abrasion depth of the composites reduces by 73%, the thermal conductivity of the composites increases by 77%, the specific heat of the composites decreases by 17.7%, the damping ratio of the composites increases by 20%, and the electromagnetic wave reflectivity of the composites decreases by 38% compared with pure cementitious composites.

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Mechanical, thermal and electromagnetic properties of nanographite platelets modified cementitious composites

Macroscopic graphite particulate reinforced commercially pure aluminum matrix composites were prepared by air pressurization seepage technique.The internal friction(damping properties) and relative dynamic modulus were tested in the temperature range of 25-400 ℃ at low frequencies and strain amplitudes by using multifunction internal friction apparatus.The microstructure of the composites was observed by means of transmission electron microscope.The results show that little micro pores were found on the interface of the composites,and the bonding between the particles and the matrix was weak.With the increase of the graphite particulate volume fraction the damping properties of the composites with same graphite particles grain size increased.With the increase of the graphite particulate grain size the damping properties of the composites with same graphite particulate volume fraction increased.Compared with the damping properties of the commercially pure aluminum,the damping properties of the composites increased 2-3 times.The main damping mechanisms for the composites were the interface damping and dislocation damping.

Huang Tiancheng

Papers

Damping Properties of Macroscopic Graphite Particulate Reinforced Commercially Pure Aluminum Matrix Composites