Synthesis and characterization of new amorphous Si/B/N/C ceramics with increased carbon content through single-source precursors

Improved durability of Si/B/N/C random inorganic networks

“…desired side reaction can be suppressed by proper choice of the reaction conditions (dilution principle, low reaction temperature). 13 The second reaction step shown in Scheme 2b is necessary, because the strong Lewis acid trichloroborane cannot be employed directly for the reaction with the Grignard compound since it reacts readily with the mandatory ether solvent. 16 As a consequence, one has to perform a third reaction step in which the intermediate organoborane dialkylester is converted into the final target molecule (Scheme 2c).…”

“…13 By reacting these two molecules with hexamethyldisilazane, the new precursors [B{CH 2 (SiCl 3 )}NH] 3 (TSMB) and [B{CH 2 (SiCl 2 CH 3 )}NH] 3 (DSMB) were obtained, respectively. 14 …”

Borazine Based Molecular Single Source Precursors for Si/B/N/C Ceramics

“…Single source molecular precursors of the general type R 1 R 2 R 3 Si-X-BR 4 R 5 with X = NH [1, [8][9][10], N(CH 3 ) [11][12][13], CH 2 [14,15], C 2 H 4 [16] and R 1 -R 5 = CH 3 or Cl have proven to perform particularly well with respect to versatility and quality of the final ceramic. As measured by the combination of properties relevant for an application as structural ceramics at high temperature, the Si/B/N/C ceramics show superior performance [6].…”

Influence of methyl‐modified silyl groups on the properties of polymers and Si/B/N/C ceramics derived from N‐silylated borazine derivatives

“…Smaller regions of such Si/N phases are stabilized by turbostratic BN(C) phases due to their ability to bind free carbon and to act as a diffusion barrier . Embedded carbon enhances significantly the thermal stability of such non‐oxide ceramics and can be introduced into the polymer as methyl groups of silyl entities and of —(NMe)— linkages as well as in the form of bridging units like —(CHR)—, —(CHR—CHR)—, —(CH 2 —CH 2 —CH 2 )—, —(HC═CH)— or —(N═C═N)— …”