SiBNCx ceramics derived from single source polymeric precursor with controllable carbon structures for highly efficient electromagnetic wave absorption at high temperature

Controlling the electrical resistivity of porous silicon carbide ceramics and their applications: A review

“…25,30 Amorphous or nanostructured porous SiC are mostly obtained from the PDCs processing route. 25,64,110,111 This technique pro-vides the advantage of high porosity 25,112,113 along with low-temperature processing 25,114,115 as compared to the traditional processing routes. 114 Apart from PDCs processed samples, the presence of amorphous phase among SiC particles has also been reported in pressureless, hot-pressed, and spark plasma sintered samples.…”

“…25,64,110,111 This technique pro-vides the advantage of high porosity 25,112,113 along with low-temperature processing 25,114,115 as compared to the traditional processing routes. 114 Apart from PDCs processed samples, the presence of amorphous phase among SiC particles has also been reported in pressureless, hot-pressed, and spark plasma sintered samples. 34"36,53,55 The presence of amorphous phase in the microstructure results in an increase of the electrical resistivity as charge carriers cannot pass through this disordered structure.…”

Phase-Transformation Nanoparticles Synchronously Boosting Mechanical and Electromagnetic Performance of SiBCN Ceramics

“…The research on advanced electromagnetic (EM) wave absorbing materials has been a hot spot in tackling the problems associated with EM interference in harsh environments. − Aside from excellent absorption performance, , the combination of fine loading capability, high-temperature oxidation resistance, and light weight , also need to be considered for advanced EM wave absorbing materials. Silicon-based ceramics have been widely investigated because of their high temperature resistance, superior oxidation resistance, and creep resistance properties. , As a typical silicon-based ceramic, precursor-derived silicoboron carbonitride ceramic (PDC-SiBCN) demonstrates structural controllability, compositional homogeneity, low-temperature synthesis, and processing flexibility. − These prominent features make it more effective in preparing fibers, films, and coatings for various applications in extreme environments. − In particular, owing to its adjustable dielectric properties, PDC-SiBCN has an absolute advantage in EM wave absorption. − However, the main challenge in developing PDC-SiBCN as a load component is its high shrinkage, which results in the formation of defects during organic to inorganic transitions due to the release of gases . Moreover, their inherent brittleness owing to the intrinsically strong and directional covalent bonds cannot be ignored. , These characteristics lead to the significantly low loading capability of PDC-SiBCN ceramics .…”

1D CNT-Expanded 3D Carbon Foam/Si3N4 Sandwich Heterostructure: Utilizing the Polarization Compensation Effect for Keeping Stable Electromagnetic Absorption Performance at Elevated Temperature

“…4,6 The existing EAMs that focus on application in rising temperatures are divided into two categories: (1) integrally formed semiconductor materials (ceramics) and (2) complexphase heterostructures. In the first category, ceramics such as ZnO 7,8 and SiBCN 9 have been verified to exhibit satisfactory heat stability and EM absorbing performance. However, a single ceramic system unavoidably suffers from the disadvant-age of poor designability, which is difficult to meet the diversified requirements of lightweight and multiformity in the application of advanced electronic components.…”