Nearly stoichiometric BN fiber by curing and thermolysis of a novel poly[(alkylamino)borazine]

Lei, Yongpeng; Wang, Ying De; Song, Yimeng; Deng, Cheng; Wang, Hao

doi:10.1016/j.ceramint.2011.03.007

Cited by 18 publications

(6 citation statements)

References 34 publications

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“…If the temperature rises extremely slowly during ammonia curing, the borazine 1 will undergo polycondensation to form a high melting point polymer for curing and leave fiber with defects and low tensile strength 11 . As a result, the poor ammonia curing for PTMB has forced researchers to choose the trichloroborazine route with the more complicated process and worse spinnability, but better tensile strength after the ammonia curing to prepare BN fibers 16–19 …”

Section: Introductionmentioning

confidence: 99%

“…11 As a result, the poor ammonia curing for PTMB has forced researchers to choose the trichloroborazine route with the more complicated process and worse spinnability, but better tensile strength after the ammonia curing to prepare BN fibers. [16][17][18][19] To our best knowledge, oxygen curing is widely used in the production of carbon and silicon carbide fibers. [20][21][22] Oxygen can cure the fiber in a short time, and the resulting fiber is smooth without defects, but it has not been reported in the study of BN fibers.…”

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confidence: 99%

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Pyrolysis process for boron nitride fiber derived from tris(methylamino)borane: Evolution of the molecular structure

Wang

Min

et al. 2023

J Am Ceram Soc.

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To provide molecular-scale insight into the structural evolution from tris(methylamino)borane to boron nitride (BN) fiber during the chemical thermal-treating process, polymeric green fiber is cured in hot synthetic air at 300 • C and then treats to 400, 600, 800, and 1000 • C in ammonia. The chemical composition and structure of the volatile compounds and residual products are analyzed during the pyrolysis process for the polymeric green fiber. It is demonstrated that oxygen can be used to cure polymeric green fiber rapidly under the premise of ensuring a final fiber content of less than 1 wt% carbon and 2 wt% oxygen while maintaining the fiber tensile strength at 1000 • C. The molecular structure evolution during the pyrolysis process for polymeric green fiber after oxygen curing is determined. Specifically, in hot synthetic air, introducing oxygen and releasing methylamine generates a B-O six-membered ring structure in the polymer in the first stage. Then, the removal of methyl results in the formation of a B-N-O network in hot ammonia. Afterward, nitridation of the B-O six-membered ring promotes the evolution of the B-N six-membered ring structure with the release of water and carbon dioxide. Finally, the growth and rearrangement of the BN structure are achieved.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Pyrolysis process for boron nitride fiber derived from tris(methylamino)borane: Evolution of the molecular structure

Wang

Min

et al. 2023

J Am Ceram Soc.

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“…Boron nitride (BN) ceramic fiber can be a good candidate for reinforcing fiber in wave-transparent applications due to its low density, high melting point, and low dielectric constant and loss tangent. In the past decades, BN ceramic fibers have been fabricated through the so-called polymer-derived-ceramic (PDC) process by many researchers [5,6,7,8,9]. In our previous study, we have prepared BN fibers with excellent dielectric properties by using poly[tri(methylamino)borazine] as a preceramic polymer [10].…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Properties of Ceramic Fibers of h-BN Containing Amorphous Si3N4

Tan

Min

et al. 2019

Materials

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Composite ceramic fibers comprising about 80 wt% boron nitride (h-BN) and 20 wt% Si3N4 were fabricated through melt-spinning, electron-beam curing, and pyrolysis up to 1600 °C in atmospheres of NH3 and N2, using a mixture of poly[tri(methylamino)borazine] (PBN) and polysilazane (PSZ). By analyzing the microstructure and composition of the pyrolyzed ceramic fibers, we found the formation of binary phases including crystalline h-BN and amorphous Si3N4. Further investigations confirmed that this heterogeneous microstructure can only be formed when the introduced ratio of Si3N4 is below 30% in mass. The mean modulus and tensile strength of the fabricated composite fibers were about 90 GPa and 1040 MPa, twice the average of the pure h-BN fiber. The dielectric constant and dielectric loss tangent of the composite fibers is 3.06 and 2.94 × 10−3.

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“…Currently, several types of synthetic and commercial continuous ceramic fibers, including binary ceramic fibers, such as Al 2 O 3 , BN, and SiC fibers, and multiple ceramic fibers, such as Si–B–N, Si–C–N, and Si–C–B–N fibers, are available 5–9 . Among these fibers, Si–C–B–N fibers have attracted considerable interest owing to their remarkable oxidation resistance (up to 1500°C) and outstanding high‐temperature stability (up to 1800°C).…”

Section: Introductionmentioning

confidence: 99%

“…3,4 Currently, several types of synthetic and commercial continuous ceramic fibers, including binary ceramic fibers, such as Al 2 O 3 , BN, and SiC fibers, and multiple ceramic fibers, such as Si-B-N, Si-C-N, and Si-C-B-N fibers, are available. [5][6][7][8][9] Among these fibers, Si-C-B-N fibers have attracted considerable interest owing to their remarkable oxidation resistance (up to 1500 • C) and outstanding high-temperature stability (up to 1800 • C). The superior high-temperature stability of the SiBCN quaternary ceramic system was first reported by Riedel et al They reported that Si-C-B-N ceramics could exhibit amorphous structure and a very low loss weight loss at temperatures up to 2000 • C. 10 Müller et al synthesized Si 15 C 63 N 8 B 14 and Si 13 C 57 N 14 B 16 ceramics via a thermolysis of polymeric boron-containing silazanes [Si(CH = CH 2 ) 2 ⋅NH] n (n = 3, 4), which were mass stable at temperatures up to 2150 • C. 11,12 After that, Wang et al synthesized Si 2.9 B 1.0 C 14 N 2.9 , Si 3.9 B 1.0 C 11 N 3.2 , and Si 5.3 B 1.0 C 19 N 3.4 ceramics using a polymer-derived method.…”

Section: Introductionmentioning

confidence: 99%

SiC nanograins stabilized Si–C–B–N fibers with ultrahigh‐temperature resistance

et al. 2022

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Continuous ceramic fibers with ultrahigh-temperature stability are in high demand for applications in advanced space propulsion and thermal protection systems. In this study, SiC nanograins stabilized Si-C-B-N ceramic fibers were prepared using chemically modified polyborosilazane via a polymer-derived method. The fabricated Si-C-B-N fibers exhibited a rather high tensile strength of approximately 1.8 GPa and a high strength retention of approximately 90% after annealing at 2100 • C for 0.5 h under a nitrogen atmosphere. The ultrahightemperature stability can be contributed to the presence of thermodynamically stable SiC nanograins and the encapsulation of SiC nanograins by the BN(C) phase and amorphous Si-C-B-N matrix. Our work offers a convenient strategy for preparing Si-based ceramic fibers with ultrahigh-temperature stability at beyond 2000 • C.

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Nearly stoichiometric BN fiber by curing and thermolysis of a novel poly[(alkylamino)borazine]

Cited by 18 publications

References 34 publications

Pyrolysis process for boron nitride fiber derived from tris(methylamino)borane: Evolution of the molecular structure

Pyrolysis process for boron nitride fiber derived from tris(methylamino)borane: Evolution of the molecular structure

Microstructures and Properties of Ceramic Fibers of h-BN Containing Amorphous Si3N4

SiC nanograins stabilized Si–C–B–N fibers with ultrahigh‐temperature resistance

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