Synthesis, Optimization and Characterization of Silicon Carbide (SiC) from Rice Husk

Alweendo, Shatumbu Thomas; Johnson, Oluwagbenga T.; Shongwe, Mxolisi Brendon; Kavishe, F. P. L.; Borode, J. O.

doi:10.1016/j.promfg.2019.06.042

Cited by 22 publications

(15 citation statements)

References 8 publications

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“…From our previous study 21 , we established that there are 20% SiO 2 and 11% carbon by mass in the rice husk from proximate analysis. Therefore, the theoretical SiC mass was determined from the stoichiometric equation using the SiO 2 and C masses present in the rice husk used at different temperatures.…”

Section: Synthesis Of Sic By Pyrolysis Of Rice Huskmentioning

confidence: 99%

Microstructural and Mechanical Properties of Alumina (Al2O3) Matrix Composites Reinforced with SiC from Rice Husk by Spark Plasma Sintering

et al. 2020

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Alumina (Al 2 O 3) suffers from low fracture toughness and low bending strength which restrict its application in the industry for some advanced components. The incorporation of submicron SiC into Al 2 O 3 matrix improves mechanical properties of the matrix. However, the high cost of SiC has delayed the industrial interest of synthesizing Al 2 O 3-SiC composites. Rice husk, an agricultural waste material, is a potential source of low-cost SiC. Therefore, this study presents a simple approach to synthesizing SiC from locally sourced rice husk and using it to reinforce alumina. Rice husk was pyrolysed in a tube furnace under argon atmosphere at different temperatures (1000 °C-1500 °C) and reaction times (60-120 min). Furthermore, Alumina powder was admixed with 5-20 vol% SiC derived from rice husk, and then sintered at temperatures between 1300 °C-1600 °C by spark plasma sintering. Maximum yield of SiC was obtained from rice husk at 1500 °C and 120 min. Materials with theoretical densities higher than 95% were achieved for the sintered composites. The hardness of sintered composites reached a maximum of 20.2±1.4 GPa, while a maximum of 4.7±.7 MPa.m 0.5 was obtained for the fracture toughness.

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Section: Synthesis Of Sic By Pyrolysis Of Rice Huskmentioning

confidence: 99%

Microstructural and Mechanical Properties of Alumina (Al2O3) Matrix Composites Reinforced with SiC from Rice Husk by Spark Plasma Sintering

et al. 2020

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“…Thus, the growth mechanism of the whisker in this study cannot follow the vapor–liquid–solid growth model . On the basis of the above experimental results, the vapor–solid (VS) growth mechanism is the main growth process of the whisker . The involved possible reactions during the preparation process are depicted as follows …”

Section: Resultsmentioning

confidence: 99%

“…9 On the basis of the above experimental results, the vapor−solid (VS) growth mechanism is the main growth process of the whisker. 39 The involved possible reactions during the preparation process are depicted as follows…”

Section: ■ Results and Discussionmentioning

confidence: 99%

High Yield Silicon Carbide Whiskers from Rice Husk Ash and Graphene: Growth Method and Thermodynamics

Chen

Kong

Liu

et al. 2019

ACS Sustainable Chem. Eng.

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A new stacking bed method to prepare high-quality silicon carbide whiskers (SiCws) with high yield has been proposed. To provide a steady and high concentration SiO atmosphere during the carbothermal reaction, the mixture of graphene and rice husk ash is used as a SiO generator, which is different from the traditional methods using sole silicon sources. The as-prepared whiskers, growing along the direction of [111], show a diameter of 30–120 nm. SiCws obtained by the optimized approach exhibit a higher stacking fault (SF) density. As indicated by thermal gravimetric mass spectrometry results, SiO gas is a key factor affecting the yield and SFs of SiC whiskers. Furthermore, combined with the chemical reaction thermodynamics, the growth mechanism of whiskers is presented following the vapor–solid mode. This contribution provides new insights into the industrial production of high value-added carbide whiskers.

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“…Moreover, the properties of raw materials play a significant role in synthesizing SiC. Among these, biomass materials are a viable solution for producing SiC at lower temperatures [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on the ability to synthesize SiC from rice husks

Kieu Do,

Nguyen,

Huynh

2024

Mater. Res. Express

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Agricultural production in Vietnam annually generates a substantial volume of by-products and waste, with rice husks constituting the predominant fraction. Due to their meager economic value, rice husks are typically deemed agricultural waste and are commonly disposed of through incineration or discharge into rivers, contributing significantly to environmental pollution. In this investigation, rice husks were employed as the principal raw material for synthesizing silicon carbide. A blend of rice husks and silica gel in a ratio of 1.4/1 was subjected to sintering in a CO2 environment within the temperature range of 800 – 1200 oC for 30 minutes. The chemical composition of the resultant product post-pyrolysis was ascertained in accordance with the ISO 21068-2:2008 standard. The capacity for SiC formation was further assessed utilizing Fourier transform infrared spectroscopy and X-ray diffraction. The outcomes revealed that the optimal temperature for SiC synthesis was 1200 oC. The composition of the sample post-pyrolysis was determined as 20.4% SiC, 51.2% SiO2, and 26.4% C (%wt.). The primary phase constituents encompass amorphous carbon, cristobalite, α-SiC, and β-SiC. Scanning Electron Microscopy/ Energy Dispersive X-ray imaging of the product at 1200 oC exhibited dispersed SiC crystals on a SiO2-C substrate. The presence of SiC suggests the potential application of the product as a wear-resistant material.

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Synthesis, Optimization and Characterization of Silicon Carbide (SiC) from Rice Husk

Cited by 22 publications

References 8 publications

Microstructural and Mechanical Properties of Alumina (Al2O3) Matrix Composites Reinforced with SiC from Rice Husk by Spark Plasma Sintering

Microstructural and Mechanical Properties of Alumina (Al2O3) Matrix Composites Reinforced with SiC from Rice Husk by Spark Plasma Sintering

High Yield Silicon Carbide Whiskers from Rice Husk Ash and Graphene: Growth Method and Thermodynamics

Effect of temperature on the ability to synthesize SiC from rice husks

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