Preparation of reactive sintering Si3N4-Si2N2O composites ceramics with diamond-wire saw powder waste as raw material

Jin, Xing; Zhuang, Yanxin; Xing, Pengfei; Kong, Jian; Zhou, Xuetong; Han, Xiao

doi:10.1016/j.jhazmat.2020.123145

Cited by 22 publications

(4 citation statements)

References 37 publications

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“…On the other hand, it will be react form Si2N2O when the partial pressure of oxygen is between 1 × 10 −23.7 atm and 1 × atm，and only when the oxygen partial pressure is less than 1 × 10 −23.7 atm, it will re form Si3N4. Thus, in the production of Si3N4, a low oxygen partial pressure is vit optimal silicon nitride synthesis [28]. By comparing the phase equilibrium diagrams illustrated for the Si-N-O syste various temperatures in Figure 8, it is evident that the dominant region of Si3N4 towards the right with an increase in temperature.…”

Section: Thermodynamic Analysis Of Silicon Dust Nitridingmentioning

confidence: 93%

“…On the other hand, it will be reacted to form Si 2 N 2 O when the partial pressure of oxygen is between 1 × 10 −23.7 atm and 1 × 10 −17.4 atm, and only when the oxygen partial pressure is less than 1 × 10 −23.7 atm, it will react to form Si 3 N 4 . Thus, in the production of Si 3 N 4 , a low oxygen partial pressure is vital for optimal silicon nitride synthesis [28].…”

Section: Thermodynamic Analysis Of Silicon Dust Nitridingmentioning

confidence: 99%

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Utilization of Silicon Dust to Prepare Si3N4 Used for Steelmaking Additives: Thermodynamics and Kinetics

Hu,

Xue,

Song

et al. 2024

Processes

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Silicone monomers are the basic raw materials for the preparation of silicone materials. The secondary dust generated during the preparation of silicone monomer by the Rochow–Müller method is a fine particulate waste with high silicon content. In this paper, the physical and chemical properties of silicon powder after pretreatment were analyzed, and an experimental study was conducted on the use of silicon dust in the preparation of Si3N4, a nitrogen enhancer for steelmaking, by direct nitriding method in order to achieve the resourceful use of this silicon dust. Furthermore, the thermodynamics and kinetics of the nitriding process at high temperatures were analysed using FactSage 8.1 software and thermogravimetric experiments. The results indicate that after holding at a temperature range of 1300~1500 °C for 3 h, the optimal nitriding effect occurs at 1350 °C, with a weight gain rate of 26.57%. The nitridation of silicon dust is divided into two stages. The first stage is the chemical reaction control step. The apparent activation energy is 2.36 × 105 kJ·mol−1. The second stage is the diffusion control step. The silicon dust growth process is mainly controlled by vapor–liquid–solid (VLS) and vapor–solid (VS) mechanisms.

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Section: Thermodynamic Analysis Of Silicon Dust Nitridingmentioning

confidence: 93%

Section: Thermodynamic Analysis Of Silicon Dust Nitridingmentioning

confidence: 99%

Utilization of Silicon Dust to Prepare Si3N4 Used for Steelmaking Additives: Thermodynamics and Kinetics

Hu,

Xue,

Song

et al. 2024

Processes

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“…(c) The metal impurities of DWSSW can enhance the nitriding and sintering process. In our previous investigation, 17 we successfully prepared the Si 3 N 4 −Si 2 N 2 O composite ceramics with DWSSW as raw material through the one‐step reaction‐sintering nitridation method. However, the holding time at the high temperature of the sintering process is too long of 4 h to tolerate, and the apparent porosity of the obtained products is as high as about 50%, leading the poor mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fe₂O₃ additive on the preparation of Si₃N₄−Si₂N₂O composite ceramics via diamond‐wire saw silicon waste

Fang

Sun

et al. 2023

Int J Applied Ceramic Tech

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In this study, Si3N4−Si2N2O composite ceramics were prepared through a two‐step combination of the direct nitriding method and spark plasma sintering method with diamond‐wire saw silicon waste in the photovoltaic industry as raw material. The whole holding time at the constant temperature of the preparing process only lasts 35 min, in which the nitriding time only takes 30 min and the sintering time only takes 5 min. The effects of the Fe2O3 additive on the nitriding and sintering process were investigated in detail. The results show that the Fe2O3 additive accelerates the nitriding process by promoting the formation and diffusion of the gas phase and reducing the apparent activation energy of the reaction between the gas phase containing silicon and N2. Meanwhile, the Fe2O3 additive also promotes the sintering process by lowering the eutectic temperature of the SiO2−Al2O3 and the SiO2−Y2O3 binary system. The optimal technical parameters follow the nitriding temperature of 1400°C, the nitriding time of 30 min, the sintering temperature of 1800°C, and the sintering time of 5 min. The Si3N4−Si2N2O composite ceramic prepared under the above conditions exhibits good performance with an apparent porosity of 2.7%, Vickers hardness of 16.54 GPa, and fracture toughness of 4.1 MPa·m1/2.

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“…Due to the ultra ne particle size (~ 1 µm) of SCW, it will cause serious environmental pollution if without properly management. SCW is mainly consisted of Si (80 ~ 85 wt%), SiO 2 (13 ~ 16 wt%) and other impurities (2 ~ 4 wt%) (Jin et al, 2020a). The high content of Si in SCW inspires researchers to recycle it to produce Si ingots or Si-containing materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation of High-Quality Silicon with Silicon Cutting Waste by a Carbothermal Reduction Method

Wei

Zhang

Zhao

et al. 2023

Silicon

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Silicon cutting waste (SCW) is mainly consisted of Si (80 ~ 85 wt%), SiO 2 (13 ~ 16 wt%) and other impurities (2 ~ 4 wt%). Nowadays, the Si is commercially recycled to produce Si ingots by a slag re ning method, but the SiO 2 is melted into silicon slag and discarded as waste. In this paper, a carbothermal reduction method has been proposed for recycling Si resources from Si and SiO 2 in SCW to prepare highquality silicon in submerged arc furnace. Petroleum coke was selected as the carbonaceous reducing agent. Firstly, the effects of carbon content on the equilibrium compositions of Si-SiO 2 -C system were simulated. Secondly, SCW was mixed with petroleum coke under the guidance of thermodynamic analysis results. Finally, the mixtures were charged into and smelted in the furnace. Thermodynamic equilibrium analysis results showed that the value of n (SiO2) :n (C) :n (SiO2) should be controlled as 2.62:0.22:0.44 theoretically. Experimental results revealed that the recovery ratio of SCW was 50% and the purity of Si products was 99.40%. This proposed method provides an effective and industrialized applicable approach for recycling SCW.

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Preparation of reactive sintering Si3N4-Si2N2O composites ceramics with diamond-wire saw powder waste as raw material

Cited by 22 publications

References 37 publications

Utilization of Silicon Dust to Prepare Si3N4 Used for Steelmaking Additives: Thermodynamics and Kinetics

Utilization of Silicon Dust to Prepare Si3N4 Used for Steelmaking Additives: Thermodynamics and Kinetics

Effect of Fe₂O₃ additive on the preparation of Si₃N₄−Si₂N₂O composite ceramics via diamond‐wire saw silicon waste

Preparation of High-Quality Silicon with Silicon Cutting Waste by a Carbothermal Reduction Method

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Preparation of reactive sintering Si3N4-Si2N2O composites ceramics with diamond-wire saw powder waste as raw material

Cited by 22 publications

References 37 publications

Utilization of Silicon Dust to Prepare Si3N4 Used for Steelmaking Additives: Thermodynamics and Kinetics

Utilization of Silicon Dust to Prepare Si3N4 Used for Steelmaking Additives: Thermodynamics and Kinetics

Effect of Fe2O3 additive on the preparation of Si3N4−Si2N2O composite ceramics via diamond‐wire saw silicon waste

Preparation of High-Quality Silicon with Silicon Cutting Waste by a Carbothermal Reduction Method

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Effect of Fe₂O₃ additive on the preparation of Si₃N₄−Si₂N₂O composite ceramics via diamond‐wire saw silicon waste