Improvement of mechanical and dielectric properties of PIP-SiCf/SiC composites by using Ti3SiC2 as inert filler

High-temperature dielectric and electromagnetic interference shielding properties of SiCf/SiC composites using Ti3SiC2 as inert filler

“…4a and b, the composites with filler show an average complex permittivity of 19.0-j19.0 and tan d of 1.01 at 10 GHz, which are higher than the composites without filler, whose corresponding values are 17.0-j16.0 and 0.94 respectively. On one hand, the Ti 3 SiC 2 filler with a relative high e 0 value contributes to enhancing the e 0 of the composites according to the mixing rules [24]. On the other hand, quantities of interfaces are formed between the Ti 3 SiC 2 particles and SiC matrix with the incorporation of Ti 3 SiC 2 filler.…”

“…The specific weight ratios of each component of SiC f /SiC composites are given in Table 1. It is worth noting that the weak proportion of micropores can be negligible in adjusting the dielectric properties owing to the rather low permittivity compared with other components of the composites [24].…”

“…The detailed preparation routes of the infiltrating slurry and final composites with Ti 3 SiC 2 filler were represented in Ref. [24]. The PIP cycles of the final composites were repeated for 9 times until the mass gain was less than 1 wt.%.…”

“…From the mechanical standpoint, the incorporating filler can effectively improve the infiltration efficiency during the PIP process and act as strengthening phase to enhance the mechanical properties of the composites [24]. Thus, in the present work, titanium silicon carbide (Ti 3 SiC 2 ) was introduced into the polycarbosilane (PCS) precursor as inert filler to optimize the dielectric and EMI shielding properties of SiC f /SiC composites, owing to its nano-laminate structure, good electrical and thermal conductivities, low specific gravity, and excellent oxidation resistance at elevated temperatures [25].…”

Effect of different kinds of SiC fibers on microwave absorption and mechanical properties of SiCf/SiC composites

“…The microwave absorption and mechanical properties of SiC CFRCMCs depend on complex permittivity, electrical conductivity and free carbon content of SiC bers, as well as interphase and matrix. The SiC ceramics matrix can be fabricated by chemical vapor in ltration (CVI) [11] , precursor impregnation and pyrolysis (PIP) [12] , liquid silicon in ltration (LSI) [13] and melt in ltration (MI) [14] . Among these techniques, the PIP method has many advantages, for instance, the designable molecular precursor of polymer derived ceramics (PDC), safe in operation and the feasibility of manufacture in large complex components.…”