Controlled growth of SiC crystals in combustion synthesis

Li, Fēi; Cui, Wei; Tian, Zhaobo; Zhang, Jie; Du, Songmo; Chen, Zhanglin; Chen, Kexin; Liu, Guanghua

doi:10.1111/jace.18060

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…Combustion synthesis (CS), also named as selfpropagating high-temperature synthesis (SHS), is a common method to prepare ceramic or refractory powders with simple process, low cost, and short period [40][41][42]. For a combustion reaction, the maximum temperature that can be achieved under adiabatic conditions is called the adiabatic temperature (T ad ), which can be used as a semi-quantitative criterion to predict if the combustion reaction can take place in a self-sustained way (Fig.…”

Section: Introduction mentioning

confidence: 99%

Preparation of SiC coated graphite composite powders by nitriding combustion synthesis

Zhang,

Xie,

Lin

et al. 2023

Journal of Advanced Ceramics

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Ceramic-coated graphite powders are considered as effective raw materials to fabricate three-dimensional continuous ceramic skeleton-reinforced graphite matrix composites which can overcome their inherent poor densification and improve their mechanical and antioxidation properties. However, the morphology and thickness regulation of ceramic coatings on graphite particles are still a great challenge. Herein, SiC-coated graphite (graphite@SiC) powders were prepared by nitriding combustion synthesis using Si and graphited mesocarbon microbead (MCMB) as raw powders with polytetrafluoroethylene (PTFE) as a promoter. The effects of the PTFE content and the Si/MCMB molar ratio on the phase composition and coating morphology were investigated. The phase transition and microstructure evolution of a combustion synthesis (CS) process were revealed by a gas-released quenching experiment. When the Si/MCMB molar ratio was 1 : 3 and the PTFE content was 10 wt%, the thickness of the SiC coating synthesized under 2 MPa N 2 reached 1.14 μm. The corresponding sintered graphite@SiC composite had relative density of 99.2% and flexural strength of 231 MPa, accompanied by a significant improvement in high-temperature antioxidation properties. The as-synthesized graphite@SiC powders with good sinterability and antioxidation properties show great promise for applications in the nuclear industry and other extreme fields.

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Section: Introduction mentioning

confidence: 99%

Preparation of SiC coated graphite composite powders by nitriding combustion synthesis

Zhang,

Xie,

Lin

et al. 2023

Journal of Advanced Ceramics

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“…The strength of the fiber is closely related to the composition, microstructure, and crystallization orientation of the fiber after thermal treatment 10 . Therefore, controlling the near‐stoichiometric ratio of BN elements, reducing crystal defects, and improving BN fiber's crystallization and orientation are beneficial to further increase the fiber strength, thermal stability, and transparent properties 11–14 .…”

Section: Introductionmentioning

confidence: 99%

“…9 The strength of the fiber is closely related to the composition, microstructure, and crystallization orientation of the fiber after thermal treatment. 10 Therefore, controlling the near-stoichiometric ratio of BN elements, reducing crystal defects, and improving BN fiber's crystallization and orientation are beneficial to further increase the fiber strength, thermal stability, and transparent properties. [11][12][13][14] However, according to the previous research on the synthesis of precursor polymers and pyrolysis mechanism, most polyborazine precursors are nitrogen-rich, and a large number of N elements will be excessive in the process of carbon removal in an ammonia atmosphere and crystallization in a nitrogen atmosphere, resulting in the content of boron and nitrogen deviating from stoichiometry.…”

Section: Introductionmentioning

confidence: 99%

Nearly stoichiometric BN fiber with high crystallinity achieved by boron trichloride assisted curing process

Wang

Meng

et al. 2021

J Am Ceram Soc

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Given the superior thermal stability and microwave transparency features, continuous BN fibers have displayed great potential to fulfill the increasing demand for high‐temperature structural and functional materials. The performance of BN ceramic fiber depends heavily upon its composition and microstructure. Herein, nearly stoichiometric BN fibers with high crystallinity were achieved through a facile boron trichloride (BCl3) assisted curing process. The fibers achieved a boron/nitrogen element ratio of 0.996:1 with increasing the degree of curing. After subsequent heat treatment, the fibers had uniform elemental distribution and h‐BN crystal structure. Compared with pure NH3 curing, the BN fibers cured with BCl3 demonstrated higher crystallinity (92.35%) and consistent orientation (79.8%). The existing state changes of elements revealed BCl3 assisted curing process could evenly disperse B atoms into the precursor fibers to fill the vacancies caused by nitrogen enrichment. These insights improve our understanding of preceramic fibers treatment for exploiting high‐performance BN ceramic fibers.

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“…The Fe-MOF@SiO 2 nanorod possesses a uniform temperature distribution during the whole heating process. The metal species nucleate synchronously from a multisite, and the growth of crystals is limited by neighboring crystals, 31 thus inducing the formation of UNPs inside the integrated carbon framework, which can be defined as a pseudopyrolysis process. Excitingly, the Fe-MOF@SiO 2 nanorods maintain an integrated structure with a smooth surface, and a number of UNPs (∼5 nm) are uniformly distributed inside after the pseudopyrolysis process, as shown in Figure 1c−f.…”

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confidence: 99%

Pseudopyrolysis of Metal–Organic Frameworks: A Synchronous Nucleation Mechanism to Synthesize Ultrafine Metal Compound Nanoparticles

et al. 2023

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Metal−Organic frameworks (MOFs) are increasingly being investigated for the synthesis of carbon-supported metal-based ultrafine nanoparticles (UNPs). However, the collapse of the carbon framework and aggregation of metal particles in the pyrolysis process have severely hindered their stability and applications. Here, we report the synchronous nucleation pseudopyrolysis of MOFs to confine Fe/FeO x UNPs in intact porous carbon nanorods (IPCNs), revealed by in situ transmission electron microscopy experiments and ex situ structure analysis. The pseudopyrolysis mechanism enables strong physical and chemical confinement effects between UNPs and carbon by moderate thermal kinetics and abundant oxygen defects. Further, this strong confinement is greatly beneficial for subsequent chemical transformations to obtain different Fe-based UNPs and excellent electrochemical performance. As a proof of concept, the as-prepared FeSe UNPs in IPCNs show superior lithium storage performance with an ultrahigh and stable capacity of 815.1 mAh g −1 at 0.1 A g −1 and 379.7 mAh g −1 at 5 A g −1 for 1000 cycles.

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Controlled growth of SiC crystals in combustion synthesis

Cited by 8 publications

References 19 publications

Preparation of SiC coated graphite composite powders by nitriding combustion synthesis

Preparation of SiC coated graphite composite powders by nitriding combustion synthesis

Nearly stoichiometric BN fiber with high crystallinity achieved by boron trichloride assisted curing process

Pseudopyrolysis of Metal–Organic Frameworks: A Synchronous Nucleation Mechanism to Synthesize Ultrafine Metal Compound Nanoparticles

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