Abstract
B4C ceramics with different contents of graphene platelets (GPL) were synthesized by a pressureless process in Ar atmosphere. The influences of GPL on mechanical properties, thermal conductivity and electrical resistivity of the B4C ceramics were investigated. Mechanical properties ran up to optimal condition with hardness of 29.1 GPa, bending strength of 383.9 GPa and fracture toughness of 5.72 MPa m1/2 with 0.8 wt% GPL separately. Thermal conductivity and electrical resistivity reached extreme values of 26.35 W m−1 k−1 and 0.1 Ω cm−1. Performances of the ceramics were mainly affected by the generation of non-functional-GPL and the result indicated that a large amount of non-functional-GPL could contribute to poorer overall performance. Meanwhile, two particular pullout mechanisms concerning toughness enhancing was discussed in detail.
Highlights
B4C ceramics are widely used as nozzles, sharpeners and armours owing to their low density, high hardness, corrosion resistance and abrasion resistance
During the process of liquid-phase mass transfer, graphene platelets (GPL) is always presented in the form of a lamellar solid as it is difficult for GPL to rearrange followed the liquid phase, leaving small amounts of tiny pores behind after liquid promoter additions cooled down
When the content rises to 1.0 wt%, it is harder for excessive GPL to be dispersed uniformly, so the GPL has a higher chance to combine with pores and non-functional-GPL is formed
Summary
B4C ceramics are widely used as nozzles, sharpeners and armours owing to their low density, high hardness, corrosion resistance and abrasion resistance. The relatively low fracture toughness and bending strength caused by the intrinsic brittleness of covalent bonding ceramics significantly reduce the service life of B4C ceramics [1,2]. B4C ceramics are mainly fabricated by hot pressing and spark plasma sintering (SPS) methods [3,4,5,6,7]. Graphene has extensive potential applications owing to its excellent properties in many aspects, such as outstanding mechanical properties
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