Microscopic, mechanical and thermal properties of spark plasma sintered ZrB2 based composite containing polycarbosilane derived SiC

Comparison of ultrafine-grain isotropic graphite prepared from microcrystalline graphite and pitch coke

“…5a shows the variation of the thermal conductivities of these three kinds of UGIG with temperature. The thermal conductivities of all UGIG decrease with the increase of test temperature owing to the decrease of phonon motion mean free path and the increase of phonon scattering intensity at elevated temperature [39]. Specifically, the thermal conductivity of PCG8 decreases from 106.4 W/m•K at 25 °C to 61.6 W/m•K at 800 °C.…”

Greener solvents for the processing of preceramic polycarbosilane: application in the preparation of B4C/SiC composites

“…Among the ceramic precursors, polycarbosilanes are commonly used for their ability to generate SiC-based ceramics with a wide range of applications in the additive manufacturing eld, [5][6][7] shaping of the membrane, 8,9 and for bulk material production. [10][11][12] Among all the silicon-based preceramic polymers, allylhydridopolycarbosilane (AHPCS), also known as SMP-10 (StarPCS SMP-10, Starre Systems, USA), has attracted growing interest from the scientic community, with nearly 300 references in publications since 2015. This polymer is of great interest because its Si/C ratio is close to one, leading to a nearly stoichiometric SiC ceramic aer pyrolysis with a low amount of residual carbon.…”

Medium‐temperature sintering efficiency of ZrB2 ceramics using polymer‐derived SiBCN as a sintering aid

“…The discovery of polymer‐derived ceramics (PDCs) opens a new window for the preparation of advanced high‐temperature ceramics, and their rapid development makes it possible to be the sintering aids for non‐oxide ceramics. For example, polycarbosilane (PCS), a preceramic polymer of SiC, was added into ZrB 2 powders to prepare ZrB 2 –SiC ceramics . The ultrafine SiC from the pyrolysis of PCS could inhibit the coarsening of ZrB 2 grains while the residual carbon could remove the oxides surrounding the surface of starting ZrB 2 powder, which enhanced the densification of the main phase and reduced the sintering temperature.…”