Synthesis of porous Si3N4/SiC ceramics with rapid nitridation of silicon

Hu, Hailong; Zeng, Yu‐Ping; Zuo, Kaihui; Xia, Yongfeng; Yao, Dongxu; Günster, Jens; Heinrich, Jürgen G.; Li, Sean

doi:10.1016/j.jeurceramsoc.2015.06.028

Cited by 43 publications

(14 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Several studies of silicon nitridation behavior have investigated the influence of additives, such as clay, Y 2 O 3 and ZrO 2 , on the nitridation rate and temperature [14,15].…”

Section: Introductionmentioning

confidence: 99%

Formation mechanism of Si3N4 in reaction-bonded Si3N4-SiC composites

Long

et al. 2016

Ceramics International

View full text Add to dashboard Cite

“…Several studies of silicon nitridation behavior have investigated the influence of additives, such as clay, Y 2 O 3 and ZrO 2 , on the nitridation rate and temperature [14,15].…”

Section: Introductionmentioning

confidence: 99%

Formation mechanism of Si3N4 in reaction-bonded Si3N4-SiC composites

Long

et al. 2016

Ceramics International

View full text Add to dashboard Cite

“…DG is the Gibbs free energy, R is the molar gas constant equal to 8.314 J/(molÁK), p P is the product partial pressure, p R is the reactant partial pressure, and p h is the standard atmospheric pressure. Figure 5 shows that in a great range of lg[p(O 2) /p h ] before O 2 partial pressure reduces to as low as Si can react with N 2 , DG of reaction (5) and (6) is much smaller. It means that reaction (5) and (6) are much easier to occur and Si 3 N 4 is oxidized earlier than Si in the process of producing Si 3 N 4 -bonded ferrosilicon nitride.…”

Section: Discussionmentioning

confidence: 99%

Silicon nitridation mechanism in reaction‐bonded Si₃N₄–SiC and Si₃N₄‐bonded ferrosilicon nitride

Long

Jin

et al. 2018

J Am Ceram Soc

View full text Add to dashboard Cite

Reaction‐bonded Si3N4–SiC and Si3N4‐bonded ferrosilicon nitride, with Si powder, SiC particles and Fe3Si–Si3N4 particles as raw materials, respectively, are prepared in flame‐isolation nitridation shuttle kiln with flowing N2 at 1723K. There is columnar β‐Si3N4 in both Si3N4–SiC and Si3N4‐bonded ferrosilicon nitride. However, fibrous α‐Si3N4 is only observed in Si3N4–SiC and Si3N4‐bonded ferrosilicon nitride contains much more Si2N2O than Si3N4–SiC. By analyzing the oxidation thermodynamics of Si and Si3N4, it is known that in the process of producing Si3N4–SiC, Si is oxidized first to gaseous SiO and fibrous α‐Si3N4 is generated with SiO and N2. The existence of SiO is the reason of low silicon nitridation rate. But in the process of producing Si3N4‐bonded ferrosilicon nitride, Si3N4 is easier to be oxidized than Si and Si2N2O is generated on the surface of Si3N4 hexagonal prisms in ferrosilicon nitride particles. Meanwhile, Si in raw materials forms new ferrosilicon alloys with Fe3Si, which decreases the temperature of liquid appearance and blocks some open pores in the samples, which stops the matter loss of nitridation. Liquid ferrosilicon alloys favors β‐Si3N4 generation from Si direct nitridation and fibrous α‐Si3N4 transformation, which used to exist in ferrosilicon nitride raw materials.

show abstract

“…Although the liquid phase can improve nitrogen diffusion, the liquid silicon would agglomerate into a huge block, decreasing free silicon surface area, prohibiting diffusion of nitrogen, and thus reducing productivity. 8,9 Therefore, preparing Si 3 N 4 via…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Si₃N₄ whiskers by rapid nitridation of silicon droplets

Yang

Zhang

et al. 2019

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Belt-like β-Si 3 N whiskers were successfully synthesized by nitriding of liquid silicon without catalysts at 1500°C by using micron-sized silicon powders within 10 minutes. Silicon droplets formed by the melting of silicon particles greatly facilitates the diffusion of nitrogen. Several whiskers cling together to form a whisker-cluster. The whisker-clustermorphology results from nitriding of separate silicon droplets. The growth of the belt-like β-Si 3 N 4 whisker was controlled by vapor-liquid-solid mechanism. The synthesis of silicon nitride whiskers can be effectively improved by nitriding liquid phase silicon.

show abstract

Synthesis of porous Si3N4/SiC ceramics with rapid nitridation of silicon

Cited by 43 publications

References 28 publications

Formation mechanism of Si3N4 in reaction-bonded Si3N4-SiC composites

Formation mechanism of Si3N4 in reaction-bonded Si3N4-SiC composites

Silicon nitridation mechanism in reaction‐bonded Si₃N₄–SiC and Si₃N₄‐bonded ferrosilicon nitride

Synthesis of Si₃N₄ whiskers by rapid nitridation of silicon droplets

Contact Info

Product

Resources

About

Synthesis of porous Si3N4/SiC ceramics with rapid nitridation of silicon

Cited by 43 publications

References 28 publications

Formation mechanism of Si3N4 in reaction-bonded Si3N4-SiC composites

Formation mechanism of Si3N4 in reaction-bonded Si3N4-SiC composites

Silicon nitridation mechanism in reaction‐bonded Si3N4–SiC and Si3N4‐bonded ferrosilicon nitride

Synthesis of Si3N4 whiskers by rapid nitridation of silicon droplets

Contact Info

Product

Resources

About

Silicon nitridation mechanism in reaction‐bonded Si₃N₄–SiC and Si₃N₄‐bonded ferrosilicon nitride

Synthesis of Si₃N₄ whiskers by rapid nitridation of silicon droplets