Adjustable iron‐containing SiBCN ceramics with high‐temperature microwave absorption and anti‐oxidation properties

Abstract

Quaternary siliconboron carbonitride (SiBCN) ceramics show excellent hightemperature stability and oxidation resistance, indicating great potential as hightemperature electromagnetic (EM) wave absorbing materials. In this contribution, an efficient and facile method was developed to prepare bulk iron-containing SiBCN (Fe-SiBCN) ceramics with remarkable EM wave absorption at high temperature by pyrolyzing boron and iron containing precursors (PSZV-B-Fe). The introduction of boron and iron not only improves the high-temperature stability but also influences the complex permittivity and EM wave absorption. The minimum reflection coefficient (RC min ) is −61.05 dB, and the effective bandwidth absorption (EAB) is 3.35 GHz (9.05-12.4 GHz). The RC min will be decreased to −52.3 dB at 600°C as well as the EAB covers more than 67% of the X band (2.8 GHz). The high-temperature stable Fe-SiBCN ceramics with adjustable dielectric properties can be utilized as high-performance EM wave-absorbing materials in high-temperature and harsh environments.

Digital Light Processing 3D-Printed Ceramic Metamaterials for Electromagnetic Wave Absorption

“…As a potential dielectric-loss-type EM wave absorption material, PDC can adjust element components and crystalline domain structure via the design of precursor and control of the pyrolysis process. This can result in enhanced impedance matching and attenuation of EM waveabsorbing PDC materials [10,32,[35][36][37][38][39][40]. The emergence of 3D printing technology for ceramics, such as digital light processing (DLP), overcomes the challenge of fabricating ceramics with arbitrarily complex shapes [41][42][43][44][45][46][47].…”

Nanoparticles‐doped polymer‐derived SiCN ceramic with enhanced mechanical properties and electromagnetic wave absorption

“…Meanwhile, after doping Ni–Fe–MOF, the CI of the SHM‐100 shows slightly higher crystallinity. This is attributed to the catalytic ability of Fe and Ni atoms that could promote the formation of crystals (SiC, HfC, or C) during pyrolysis 64 …”

“…As a result, the decrease in relaxation time leads to an increase in 𝜀 ′ 𝑟 . 64 As shown in Figure 8C, at 300 • C, the RL min is −43.69 dB, and the EAB reaches 2.22 GHz at a matching thickness of only 1.85 mm. When the temperature further increases to 500 • C, the RL min still reaches −33.72 dB, and the EAB is 1.82 GHz with a corresponding thickness of 1.65 mm (Figure 8D).…”

Polymer‐derived Co2Si(Co)/SiCN composite ceramics with tunable microwave absorption properties

“…Compared with pure SiCN ceramics, the EMW absorbing performance of SiCN(FeNi) ceramics has been greatly improved, which achieved the minimum reflection loss (RL min ) of −18 dB and effective absorption bandwidth (EAB) of 2.5 GHz. Furthermore, SiBCN(Fe), Co 2 Si@SiC/C/SiOC/SiO 2 /Co 3 O 4 , and SiOC(Fe) have been reported 20–22 . In summary, the EMW absorption ability of precursor ceramics needs to be further improved.…”

“…Furthermore, SiBCN(Fe), Co 2 Si@SiC/C/SiOC/SiO 2 /Co 3 O 4 , and SiOC(Fe) have been reported. [20][21][22] In summary, the EMW absorption ability of precursor ceramics needs to be further improved. The studies on the Co-containing precursor ceramics with abundant nanowires that catalyzed by Co were relatively few.…”