Simple and low‐cost synthetic route for SiBCN ceramic powder from a boron‐modified cyclotrisilazane

Abstract

This study reports a simple and low-cost synthetic route for preparing SiBCN ceramic powder via pyrolysis of boron-modified cyclotrisilazane (BCTS). BCTS resins were synthesized by reacting boric acid with 1, 3, 5-trimethyl-1′, 3′, 5′-trivinylcyclotrisilazane (CTS) in the molar ratio of 1:1, 1:3, and 1:5. The boron modification in CTS resin resulted in optimum properties for preceramic polymers such as solubility in common solvents, processable viscosity (<20 cps) and high ceramic yield (>80 wt. %). The polymer to ceramic conversion was carried out at 1450 and 1650°C under a nitrogen atmosphere. The study demonstrated that the changes in CTS concentration and pyrolysis temperature significantly affected the evolution of ceramic phases, morphology, and elemental composition which were thoroughly investigated through XRD, SEM, and HRTEM techniques. The results revealed the formation of β-SiC, β-Si 3 N 4 , and oxide ceramic phases with BCTS in the molar ratio of 1:1 and 1:3; whereas, β-SiC, β-Si 3 N 4 , and turbostratic BN(C) ceramic phases were obtained with BCTS in the molar ratio of 1:5. K E Y W O R D Sboron-modified cyclotrisilazane, SiBCN ceramic, silazanes, turbostratic BN(C) ceramic phases

Polymer-derived SiBCN ceramic pressure sensor with excellent sensing performance

“…Specially, silicoboron carbonitride (SiBCN) is one of the most promising PDCs for ultra-high-temperature applications, due to its excellent stability up to 2000 ℃ and prominent creep resistance [13]. For its superior properties, SiBCN ceramics have been extensively investigated including synthesis [22][23][24], structural evolution [25][26][27][28], high temperature stability [13,29,30], etc. However, the piezoresistivity and pressure sensing ability of SiBCN ceramic have not been reported yet.…”

Combustion Synthesis of Si3N4-BN-SiC Composites by in-situ Introduction of BN and SiC

“…On one hand, it has the characteristics of SiBCN ceramics [21] . It is well known that SiBCN ceramics have two compositions of amorphous SiCxN4-x (x=1-4) and graphite-like BN(C) [22] . The above-mentioned broadening of BN peak is derive from the formation of amorphous BN(C).…”

Microstructural evolution and mechanical properties of in situ nano Ta4HfC5 reinforced SiBCN composite ceramics

“…With the development of aerospace technology, more the very first routes to prepare SiBCN materials, remain amorphous nature at least up to 1400 ℃, and do not undergo microstructural changes at this temperature [3]. The chemistry, microstructure, and properties of the PDCs SiBCN can be tailored effectively by controlling the initial reagent structure, chemical reaction, and processing parameters [4]. However, this method also has some nonnegligible shortcomings that limit its wide applications.…”