Construction of multiple heterogeneous interface and its effect on microwave absorption of SiBCN ceramics

Li, Wei; Li, Xiangcheng; Gong, Wei; Chen, Pingan; Zhu, Yongwei; Zhu, Bin

doi:10.1016/j.ceramint.2019.12.001

Cited by 44 publications

(24 citation statements)

References 42 publications

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“…Notably, another useful mixture with polymer is metal. The iron‐containing siliconboron carbonitride (SiBCN‐Fe) ceramics with multiple heterogeneous interfaces was prepared by microstructure design and polymer derived ceramics (PDC) method, using commercial PBSZ and ferrocene as polymer precursors and catalysts respectively 26 . The promising results showed superior microwave absorption properties with a minimum reflection loss of −34.28 dB and an effective absorption bandwidth of 3.76 GHz (8.64‐12.4 GHz).…”

Section: Raw Materials For 3d Printing Microwave Absorption Ceramicsmentioning

confidence: 99%

A review: 3D printing of microwave absorption ceramics

Wang

2020

Int J Applied Ceramic Tech

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Along with extensive research on the 3D printing and microwave absorption ceramics, 3D printing technology provides a great possibility for microwave absorption ceramics with arbitrary shapes in a faster, cheaper and more flexible way. This review focuses on the latest evolution in the raw materials, the structure design and the advanced additive manufacturing technologies of 3D printing microwave absorption ceramics. Firstly, the representative raw materials are divided into three categories, including ceramic powder, cermet powder and precursor resin. In addition, additives give rise to improvement of microwave absorption properties of ceramics. Secondly, based on two attenuation theories, structure design makes further efforts to enhance the microwave absorption performance of ceramics. Finally, comparisons are made between diversified manufacturing technologies to facilitate the selection of the best ones for different application in practical use. This study presents a summary of research that has been conducted to produce microwave absorption ceramics by additive manufacturing.

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Section: Raw Materials For 3d Printing Microwave Absorption Ceramicsmentioning

confidence: 99%

A review: 3D printing of microwave absorption ceramics

Wang

2020

Int J Applied Ceramic Tech

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“…Overall, the enhanced EMW absorption properties might be mainly due to the matched impedance and improved loss ability that arose from the synergetic effect among carbon fibers, BPR-derived carbon, and SiOC ceramic. To date, lots of efforts have been made to investigate and improve the EMW absorption properties of carbon fibers and PDCs, especially in construction of composites, and thus we further compared the EMW absorption capabilities between our products and absorbers recently reported and the results were displayed in Figure 10 and Table S2 [6,[9][10][11][12][13][15][16][17][18][19][20][24][25][26]. Although the RL min value for our products, namely BPR-derived carbon modified 3D needled carbon fiber reinforced SiOC composites is not the lowest, the value is comparable to those of most of PDCs (Figure 10a).…”

Section: Influence Of Pip Cycle Numbers On the Microstructure And Promentioning

confidence: 99%

“…Moreover, the functional performance of PDCs after high-temperature annealing is also desired in addition to the structural properties, and the electromagnetic wave (EMW) absorption properties of PDCs have aroused lots of attention in recent years [15][16][17][18][19][20][21][22][23]. For example, Hong et al [21] successfully prepared porous PDC-SiC/Si 3 N 4 composites by the unidirectional freeze casting of Si 3 N 4 /camphene slurries with various polycarbosilane (PCS) contents.…”

Section: Introductionmentioning

confidence: 99%

Strong and Thermostable Boron-Containing Phenolic Resin-Derived Carbon Modified Three-Dimensional Needled Carbon Fiber Reinforced Silicon Oxycarbide Composites with Tunable High-Performance Microwave Absorption Properties

Sun

2020

Applied Sciences

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This paper focuses on the preparation of boron-containing phenolic resin (BPR)-derived carbon modified three-dimensional (3D) needled carbon fiber reinforced silicon oxycarbide (SiOC) composites through a simple precursor infiltration and pyrolysis process (PIP), and the influence of PIP cycle numbers on the microstructure, mechanical, high-temperature oxidation resistance. The electromagnetic wave (EMW) absorption properties of the composites were investigated for the first time. The pyrolysis temperature played an important role in the structural evolution of the SiOC precursor, as temperatures above 1400 °C would cause phase separation of the SiOC and the formation of silicon carbide (SiC), silica (SiO2), and carbon. The density and compressive strength of the composites increased as the PIP cycle number increased: the value for the sample with 3 PIP cycles was 0.77 g/cm3, 7.18 ± 1.92 MPa in XY direction and 9.01 ± 1.25 MPa in Z direction, respectively. This composite presented excellent high-temperature oxidation resistance and thermal stability properties with weight retention above 95% up to 1000 °C both under air and Ar atmosphere. The minimal reflection loss (RLmin) value and the widest effective absorption bandwidth (EAB) value of as-prepared composites was −24.31 dB and 4.9 GHz under the optimization condition for the sample with 3 PIP cycles. The above results indicate that our BPR-derived carbon modified 3D needled carbon fiber reinforced SiOC composites could be considered as a promising material for practical applications.

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“…No doubt, the atomic combination SiBCN imparts some attractive properties to the resultant ceramics like electrical conductivity and thermal stability, as reported recently. [3][4][5] In view of such applications, molecules reflecting the composition SiNBC are important precursors. Such compounds may contain cyclic or acyclic organic/inorganic hybrid molecular backbones and are accessible by various synthetic approaches.…”

Section: Introductionmentioning

confidence: 99%

“…No doubt, the atomic combination SiBCN imparts some attractive properties to the resultant ceramics like electrical conductivity and thermal stability, as reported recently. [ 3–5 ]…”

Section: Introductionmentioning

confidence: 99%

Hydroboration of alkynylchlorosilanes as an efficient route for the synthesis of SiNNB heterocycles

Khan

2021

Applied Organom Chemis

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Alkenylsilanes bearing chlorosilyl and boryl groups geminally attached to a carbon atom ((E)‐3‐(9‐borabicyclo[3.3.1]nonan‐9‐yl)‐N,N‐dimethyl‐3‐(trichlorosilyl)prop‐2‐en‐1‐amine, 1, (1‐(9‐borabicyclo[3.3.1]nonan‐9‐yl)‐3,3‐dimethylbut‐1‐en‐1‐yl)dichloro (phenyl)silane, 2, (1‐(9‐borabicyclo[3.3.1]nonan‐9‐yl)‐2‐phenylvinyl) chloro (methyl)(phenyl)silane, 3, (1‐(9‐borabicyclo[3.3.1]nonan‐9‐yl)hex‐1‐en‐1‐yl)trichlorosilane, 4) are accessible by hydroboration of the corresponding alkynylsilanes. Only the vinyl group of 1 adopted E configuration, which may be favored by ring closure via an intramolecular B–N bonding interaction. Compounds 2–4 reacted with N‐trimethylsilylpyrazole and N‐2‐(trimethylsilylamino)pyridine by elimination of ClSiMe3 and formation of Si–N bonds. Intramolecular donor–acceptor interactions between the N and B atoms afforded five‐ and six‐membered heterocycles, which contained Si, N, and B as heteroatoms. A bis(pyrazolyl)silane was isolated upon treatment of a dichlorosilane with two equivalents of trimethylsilylpyrazole.

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Construction of multiple heterogeneous interface and its effect on microwave absorption of SiBCN ceramics

Cited by 44 publications

References 42 publications

A review: 3D printing of microwave absorption ceramics

A review: 3D printing of microwave absorption ceramics

Strong and Thermostable Boron-Containing Phenolic Resin-Derived Carbon Modified Three-Dimensional Needled Carbon Fiber Reinforced Silicon Oxycarbide Composites with Tunable High-Performance Microwave Absorption Properties

Hydroboration of alkynylchlorosilanes as an efficient route for the synthesis of SiNNB heterocycles

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