Polymer‐Derived SiOC/ZrO₂ Ceramic Nanocomposites with Excellent High‐Temperature Stability

Abstract

Polymer‐derived SiOC/ZrO2 ceramic nanocomposites have been prepared using two synthetic approaches. A commercially available polymethylsilsesquioxane (MK Belsil PMS) was filled with nanocrystalline zirconia particles in the first approach. The second method involved the addition of zirconium tetra(n‐propoxide), Zr(OnPr)4, as zirconia precursor to polysilsesquioxane. The prepared materials have been subsequently cross‐linked and pyrolyzed at 1100°C in argon atmosphere to provide SiOC/ZrO2 ceramics. The obtained SiOC/ZrO2 materials were characterized by means of X‐ray diffraction, elemental analysis, Raman spectroscopy as well as transmission electron microscopy. Furthermore, annealing experiments at temperatures from 1300° to 1600°C have been performed. The annealing experiments revealed that the incorporation of ZrO2 into the SiOC matrix remarkably increases the thermal stability of the composites with respect to crystallization and decomposition at temperatures exceeding 1300°C. The results obtained within this study emphasize the enormous potential of polymer‐derived SiOC/ZrO2 composites for high‐temperature applications.

Influence of nano-aluminum filler on the microstructure of SiOC ceramics

“…Before describing the ceramization process of the aluminum filled MK polymer with the above mentioned experimental method, we will first summarize briefly the observations gained in the case of pure MK polymer for assessment reasons. The available studies reported in the literature 28,29 show that the polymer-to-ceramic transformation of the polysiloxane MK polymer occurs in three steps and shows a ceramic yield of 86 wt.%. The first weight loss step is due to polycondensation during the cross-linking process and results in the release of H 2 O, ethanol, n-propanol and octamethyl T8 polyhedral oligosilsesquioxane (POSS).…”

In situ synthesis and electrical properties of porous SiOC ceramics decorated with SiC nanowires

“…SiC nanowires were grown steadily via a gas-gas reaction when an adequate number of reactant gases were supplied, as shown in the following reaction (1). The SiO and CO gases for the growth of SiC nanowires could be obtained from the following reactions (2)(3)(4). With increasing the content of wood powders, the excess SiO gases were released due to the formation of a large amount of graphite-like carbon, which effected the concentration of SiO and CO gases for the growth of SiC nanowires.…”

“…Porous polymer-derived ceramics (PDCs) have recently attracted a lot of interest due to their exceptionally low creep rate, high thermal stability, excellent chemical durability and tunable mechanical properties [1][2][3][4][5], which make PDCs attain the potential applications in catalyst supports, purification of water contaminated with organic dyes, electrodes, supercapacitors, gas storage and drug delivery [6][7][8][9][10].…”

Synthesis and characteristic of SiBCN/HfN ceramics with high temperature oxidation resistance

“…That is, multiple elements (such as Zr, Mg, Fe, Al and Cu) were introduced in the bonding network of Si-based ceramics [11e13]. For example, ZrO 2 phase was incorporated in SiOC, thus its thermal degradation was increased to 1300 C [14]. ZrO 2 modified SiCN fibers have better oxidation resistance than pure SiCN [15].…”