Porous silicon carbide ceramics with directional pore structures by CVI combined with sacrificial template method

Li, Shenghao; Ye, Fang; Cheng, Laifei; Li, Zhaochen; Wang, Junheng; Tu, Jianyong

doi:10.1016/j.ceramint.2022.10.360

Cited by 6 publications

(4 citation statements)

References 35 publications

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“…SiO 2(s) + SiO (g) + 3C (s) = 2Si (l) + 3CO (g) lg(P SiO /P θ ) = 40,172/T − 21.47 (10) Since the reactant SiO 2 , C, and outcome SiC in reaction (2) are all pure solids, and P CO = P θ , as well as ∆G 2 θ = 605,873 − 340.53T = 0 (11) It can be deduced that the initial reaction temperature for reaction (2) is T begin = 1779 K (1506 • C). When T > T begin , and P CO = P θ = 101.325 kPa, SiO 2 (s) and C(s) will react to produce SiC(s).…”

Section: Thermodynamic Analysismentioning

confidence: 99%

“…Owing to its favorable mechanical properties, silicon carbide (SiC) is widely used in the production of functional ceramics [11][12][13], high-grade refractories [13,14], abrasives [15], and metallurgical raw materials [16]. The synthesis of SiC powder is categorized into three processes based on the initial raw material states: the solid phase method, the liquid phase method, and the gas phase method [17].…”

Section: Introductionmentioning

confidence: 99%

“…Figure 6. Condensed phase in Si-C-O system.Since the reactant SiO2, C, and outcome SiC in reaction (2) are all pure solids, and PCO = P θ , as well as ∆G2 θ = 605,873 − 340.53T = 0(11) …”

mentioning

confidence: 99%

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Preparation of Silicon Carbide Powder from Amorphous Silica and Investigation of Synthesis Mechanism

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An innovative process for preparing silicon carbide (SiC) from acid leaching residue of ferronickel slag through a carbon–thermal reduction process was proposed in this study. The results indicate that the acid leaching residue is an ideal silicon source for SiC preparation according to its high amorphous silica content of 84.20% and fine particle size of d50 = 29.16 μm. Compared with carbon black, activated carbon, and graphite, coke is the more appropriate carbon source for SiC preparation. A micron-size SiC powder with grade of 88.90% and an average particle size (d50) of 44.68 μm can be obtained under the following conditions: the mass ratio of coke to leaching residue as 1.2:1, in an air atmosphere, reducing at 1600 °C for 3 h, following by decarbonizing at 700 °C for 4 h. The XRD, SEM and FTIR analyses show that the prepared powder is 3C-SiC and belongs to the β-SiC crystal type. Based on thermodynamic analysis and micromorphology observation, it can be concluded that with amorphous silica as the silicon source, the carbon–thermal synthesis of SiC powder follows both the solid–solid reaction mechanism and the gas–solid mechanism. The SiC created through solid–solid reaction is primarily nucleated in situ on amorphous SiO2, with a size close to that of the original acid-leaching slag, while the SiC generated according to the gas–solid mechanism mainly nucleates heterogeneously on the surface of carbon particles, resulting in a smaller particle size and mostly adhering to the surface of solid–solid nucleated SiC particles. This study provides a feasible method for the effective utilization of amorphous silica, which is also significant for the efficient consumption of the vast acid leaching residue.

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Section: Thermodynamic Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation of Silicon Carbide Powder from Amorphous Silica and Investigation of Synthesis Mechanism

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“…In the synthesis of nanoporous alumina, the common surfactants include anionic template, cationic template and neutral surfactants. After the reaction is completed, the template can be removed by high temperature calcination, microwave, solvent extraction, oxidation [9] and other methods. Although the soft template method can realize the effective recovery of template agent to a certain extent, the reaction is difficult, and the recovery process of template agent may damage the shape and structure of the target product nanoporous alumina.…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Nanoporous Alumina by an Intelligent Gel Template

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In this research, an novel green method for one-step synthesis of nanoporous alumina based on an intelligent recyclable template, which has sensitive response to temperature and can be easily removed from product and recycled to reuse by its phase changes with temperature, was applied. Using NaAlO2 as the aluminum source and temperature-sensitive intelligent gel methylcellulose (MC) as the template, the nanoporous alumina products with large specific surface area, narrow pore size distribution and worm-like pore channels were successfully prepared. And the influence of reaction time, template concentration and NaAlO2 solution concentration on the preparation of nanoporous alumina was studied.

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Effects of pore microstructures on thermal and mechanical properties of porous TiC fabricated by hot press sintering

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J Porous Mater

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Porous silicon carbide ceramics with directional pore structures by CVI combined with sacrificial template method

Cited by 6 publications

References 35 publications

Preparation of Silicon Carbide Powder from Amorphous Silica and Investigation of Synthesis Mechanism

Preparation of Silicon Carbide Powder from Amorphous Silica and Investigation of Synthesis Mechanism

One-Step Synthesis of Nanoporous Alumina by an Intelligent Gel Template

Effects of pore microstructures on thermal and mechanical properties of porous TiC fabricated by hot press sintering

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