Progress in silicon-based non-oxide structural ceramics

Thermal cross‐linking and pyrolytic conversion of poly(ureamethylvinyl)silazanes to silicon‐based ceramics

“…The silazane-derived Si-C-N powders can be processed using traditional liquid sintering into dense Si 3 N 4 -SiC nano-nano or nano-micro composites by crystallization and phase separation of the metastable Si-C-N materials at T > 1440°C. [7][8][9][10] These composites are of current interest owing to their improved mechanical properties. 5 The applicability of polysilazane precursors in the various ceramic processing techniques depends on the physical and chemical properties of the polymers selected.…”

“…This is supported by considering bond polarities, since the positively charged hydrogen atoms of N-H groups tend to react with the negatively charged hydrogen atoms of Si-H groups. Moreover, the formation of Si-N bonds is favored thermodynamically compared with, for example, the generation of weak Si-Si or N-N bonds in Eqns [7] and [9]. 31 However, several other reactions may also contribute to the total amount of hydrogen, but to a smaller extent.…”

Silicon-Based Polymer-Derived Ceramics: Synthesis Properties and Applications-A Review

“…The applicability of polysilylcarbodiimides as precursors for SiCN ceramics was discovered in our group 137,146,147 twenty years after the patent of Klebe and Murray.…”

Influence of the substitution of Y2O3 for CeO2 on the mechanical and microstructural properties of silicon nitride

“…Such inherent properties of Si 3 N 4 result from strong and directional covalent bonding between Si and N, resulting in a material with low selfdiffusion coefficient, but difficult to sinter without additives [1]. In the last decades, dense Si 3 N 4 ceramics have been obtained by liquid-phase sintering using small amounts of sintering additives to enhance diffusion, decrease porosity and, consequently, improve densification and mechanical properties of dense Si 3 [2,3].…”