Ni-catalyzed synthesis of hexagonal plate-like alpha silicon nitride from nitridation of Si powder in molten salt media

Chai, Zhinan; Ding, Jun; Deng, Chengji; Zhu, Hao; Li, Guangqiang; Yu, Chao

doi:10.1016/j.apt.2016.05.027

Cited by 48 publications

(17 citation statements)

References 29 publications

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“…Besides, SiO 2 and C in the raw materials may also participate in the formation of Si 2 N 2 O as indicated by Huang et al 23 . The involved reactions could be summarized as reactions (9-12) [21][22][23] :…”

Section: Effect Of Coppermentioning

confidence: 99%

“…It was gratifying to note that the addition of Cu had yielded good results and the obtained products had a high percentage of α-Si 3 N 4 . Some researchers had also prepared relatively pure α-Si 3 N 4 by adding a small amount of metal to silicon prior to its nitridation, such as Ca 20 , Ni 21 , and Co 22 . However, compared with Ca, Co, and Ni, the price of Cu is relatively low.…”

Section: Advantages Of Cumentioning

confidence: 99%

“…Varong and Shoichi 20 investigated the catalytic effects of 0.125-2.0 wt% calcium, yttrium, iron, silver, chromium, or tungsten on the direct nitridation of silicon granules, and found that the formation of β-Si 3 N 4 is significantly suppressed by adding small amounts of calcium or yttrium at a nitridation temperature of 1300°C. Chai et al 21 investigated the catalytic effect of Ni on the nitridation of Si from a molten salt (95 wt% NaCl and 5 wt% NaF), and obtained the hexagonal plate-like α-Si 3 N 4 . Huang et al 22 studied the catalytic effect of Co on the direct nitridation of silicon, and found that the formation of Co-Si liquid phase accelerated the nitridation of silicon as well as the in-situ growth of α-Si 3 N 4 nanorods.…”

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confidence: 99%

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Preparation of α‐Si₃N₄ by direct nitridation using polysilicon waste by diamond wire cutting

Hou

Zhang

Chou

2019

Int J Applied Ceramic Tech

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With the rapid development of the semiconductor industry and solar photovoltaic industry, a large number of polysilicon wastes from diamond wire cutting are accumulated, which not only pollute the environment, but also cause safety problems due to the ultrafine particle size and high reactivity. The diamond wire cutting polysilicon waste was used to prepare α-Si 3 N 4 by direct nitridation method. This method could not only fully recycle the waste and reduce environmental pollution, but also could reduce the production cost of α-Si 3 N 4. Furthermore, the effects of FeCl 3 , NaCl, and metal Cu on the nitridation of polysilicon waste are investigated in detail, respectively. It is found that FeCl 3 and NaCl are not ideal additives for the preparation of α-Si 3 N 4. However, α-Si 3 N 4-dominated Si 3 N 4 can be obtained via adding 5 wt% Cu after nitridation at 1250°C for 8 hours, and the relative content of α-Si 3 N 4 reaches 92.37%.

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Section: Effect Of Coppermentioning

confidence: 99%

Section: Advantages Of Cumentioning

confidence: 99%

mentioning

confidence: 99%

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Preparation of α‐Si₃N₄ by direct nitridation using polysilicon waste by diamond wire cutting

Hou

Zhang

Chou

2019

Int J Applied Ceramic Tech

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“…When the temperature rises above the melting point of the molten salt, the structure of the reactants rearranges and diffuses rapidly in the molten salt medium, and the product particles gradually nucleate and grow. Using the liquid tension of high-temperature molten salt, the molten salt method is often employed to prepare ceramic powders with sheet morphology, such as Bi2NbO5F [19] and Si3N4 [20] materials.…”

Section: Introductionmentioning

confidence: 99%

Carbon reduction of Ti3AlC2 phase for TiC nanosheet production

Bian

Dai

Zhang

et al. 2021

Journal of Asian Ceramic Societies

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In this study, we investigated the formation of TiC nanosheets from carbon black and Ti3AlC2 mixtures in NaCl-KCl eutectic salt. The effects of raw material ratio, molten salt ratio, and heating temperature on TiC formation were studied in detail. Results show that carbon black may enhance the decomposition of amounts of Ti3AlC2 at 1,100°C by heat treatment without salt addition, while molten salt plays key roles in the total decomposition of Ti3AlC2 and the formation of TiC nanosheets at 1,000°C. Higher heating temperature and excess carbon black benefits the synthesis of high content TiC. The as-synthesized TiC nanosheets are approximately 15 nm thick and 80-220 nm long. We propose a possible reaction mechanism that governs TiC formation in molten salts and explain the observations based on kinetic considerations.

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“…In the process, many metals or metal oxides additives, such as Fe, Ni, MgO, CaO, TiO 2 , Cr 2 O 3 , etc. have been reported [8,9,10,11], which act as catalyt for the nitridation of silicon powders. However, these additives cannot facilitate the growth of β-Si 3 N 4 particles with approximate spherical morphology.…”

Section: Introductionmentioning

confidence: 99%

Direct Nitridation Synthesis of Quasi-Spherical β-Si3N4 Powders with CaF2 Additive

Lan

Luo

et al. 2019

Materials

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In this work, the quasi-spherical β-Si3N4 powders were synthesized via an efficient direct nitridation strategy with CaF2 as the catalytic material under NH3 atmosphere. The effect of CaF2 on phase composition and crystalline morphology was studied. CaF2 additive can accelerate the nitridation of silicon powders, and the particles of nitridation products tend to have an equiaxed structure with the CaF2 additive increasing. When 4 wt% CaF2 additive or more was added, submicron β-Si3N4 particles with quasi-spherical morphology and eminent crystal integrity were obtained. In contrast, irregular α-Si3N4 particles appear as the main phase with less than 4 wt% CaF2 additive. The growth mechanism of Si3N4 particles was also discussed. CaxSiyOz liquid phase is crucial in the nitridation of silicon powders with CaF2 additive.

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Ni-catalyzed synthesis of hexagonal plate-like alpha silicon nitride from nitridation of Si powder in molten salt media

Cited by 48 publications

References 29 publications

Preparation of α‐Si₃N₄ by direct nitridation using polysilicon waste by diamond wire cutting

Preparation of α‐Si₃N₄ by direct nitridation using polysilicon waste by diamond wire cutting

Carbon reduction of Ti3AlC2 phase for TiC nanosheet production

Direct Nitridation Synthesis of Quasi-Spherical β-Si3N4 Powders with CaF2 Additive

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Ni-catalyzed synthesis of hexagonal plate-like alpha silicon nitride from nitridation of Si powder in molten salt media

Cited by 48 publications

References 29 publications

Preparation of α‐Si3N4 by direct nitridation using polysilicon waste by diamond wire cutting

Preparation of α‐Si3N4 by direct nitridation using polysilicon waste by diamond wire cutting

Carbon reduction of Ti3AlC2 phase for TiC nanosheet production

Direct Nitridation Synthesis of Quasi-Spherical β-Si3N4 Powders with CaF2 Additive

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Preparation of α‐Si₃N₄ by direct nitridation using polysilicon waste by diamond wire cutting

Preparation of α‐Si₃N₄ by direct nitridation using polysilicon waste by diamond wire cutting