Synthesis of beta silicon carbide powders from biomass gasification residue

Galvagno, S.; Portofino, Sabrina; Casciaro, G.; Casu, Stefania; D’Aquino, L.; Martino, Maria; Russo, Antonio Paolo; Bezzi, G.

doi:10.1007/s10853-007-1508-y

Cited by 20 publications

(14 citation statements)

References 40 publications

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“…Considering the high temperature especially at the top of the tube (1400 °C), it is reasonable to suppose that SiC synthesis could involve the solid phase in this spot, too. Thermodynamic and kinetic aspects of carbothermal reduction of SiO 2 were extensively analyzed in several papers [33,34]. It has been generally accepted that the carbothermal reduction of SiO 2 takes place as a result of two subsequent reaction steps in accordance with:…”

Section: Resultsmentioning

confidence: 99%

A novel thermal plasma-based technology for submicronic silicon carbide production at pilot scale

et al. 2019

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Submicronic powder of silicon carbide was synthesized in a pilot novel radiofrequency plasma torch reactor. The precursors were pyrolysis char and silica powders both with micrometric size. The mass rate of the precursor powder varied in the range 600-2500 g/h. The maximum test time was approximately 3 h. With the goal to increase the process yield, several technical measures were implemented. Silicon carbide yield was above 70 wt% when the plasma flame was confined by a tube that prolonged the residence time of the reactants at the useful temperature for the advancement of reaction. The silicon carbide was characterized by XRD, SEM, and DLS. Both α and β-crystalline phases were detected.

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Section: Resultsmentioning

confidence: 99%

A novel thermal plasma-based technology for submicronic silicon carbide production at pilot scale

et al. 2019

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“…Furthermore, many efforts have been made to produce SiC and other technical ceramics from secondary raw materials like biomass residues (e.g., rice husk) and wastes [12,[20][21][22]. In this last context, even more recently, plasma technique was applied for the synthesis of SiC powder using low cost silica and carbonaceous residue of tire pyrolysis as starting materials [23]. Although this process belongs to plasma synthesis methods, reaction between low cost silica and carbon source powder occurs similarly to the rapid carbothermal reduction but in a continuous process and resulting in submicronic powder mainly crystallized in β phase.…”

Section: Introductionmentioning

confidence: 99%

Sintering and mechanical properties of β‐SiC powder obtained from waste tires

et al. 2016

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Plasma synthesized SiC powder obtained from quartz and carbonaceous residue of waste tires was successfully sintered at 1925 ℃ by pressureless liquid-phase method using yttria and alumina as sintering aids (T-SiC). Comparison with sintered SiC obtained from commercial powder (C-SiC) put in evidence of similar sintered density (98%T.D.), but much finer microstructure of T-SiC than that of C-SiC. T-SiC also showed higher flexural strength than C-SiC both at room temperature (508 vs. 458 MPa) and at 1500 ℃ (280 vs. 171 MPa). Difference in liquid phase was responsible for the differences in hardness and fracture toughness. The high value of the Young's modulus of T-SiC (427 MPa) confirmed the high degree of sinterability of this powder and that it can be a promising candidate for structural applications with high added value.

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“…The first method uses a high cost silicon source, while CVD from silane and sol–gel are expensive and hazardous due to the nature of the precursors. Carbothermal reduction is the most common method of silicon carbide synthesis due to the need for high purity silicon carbide and for inexpensive precursors . Submicrometer sizes of high purity SiC powders have been synthesized via carbothermal reduction by mixing sepiolite or diatomite with carbon black, where the molar ratio of C/SiO 2 = 4 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Silicon Carbide Powders Converted from Metakaolin‐Based Geopolymer

et al. 2016

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Silicon carbide (SiC) ceramic powders were synthesized by carbothermal reduction in specific geopolymers containing carbon nanopowders. Geopolymers containing carbon and having a composition M 2 OÁAl 2 O 3 Á4.5SiO 2 Á12H 2 O+18C, where M is an alkali metal cation (Na + , K + , and Cs + ) were carbothermally reacted at 1400°C, 1500°C, and 1600°C, respectively, for 2 h under flowing argon. X-ray diffraction and microstructural investigations by SEM/EDS and TEM were made. The geopolymers were gradually crystallized into SiC on heating above 1400°C and underwent significant weight loss. SiC was seen as the major phase resulting from Na-based geopolymer heated to ≥1400°C, even though a minor amount of Al 2 O 3 was also formed. However, phase pure SiC resulted with increasing temperature. While a slight increment of the Al 2 O 3 amount was seen in potassium geopolymer, Al 2 O 3 essentially replaced cesium geopolymer on heating to 1600°C. SEM revealed that SiC formation and a compositionally variable Al 2 O 3 content depended on the alkaline composition. Sodium geopolymer produced high SiC conversion into fibrous and globular shapes ranging from~5 lm to nanosize, as seen by X-ray diffraction as well as SEM and TEM, respectively.

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Synthesis of beta silicon carbide powders from biomass gasification residue

Cited by 20 publications

References 40 publications

A novel thermal plasma-based technology for submicronic silicon carbide production at pilot scale

A novel thermal plasma-based technology for submicronic silicon carbide production at pilot scale

Sintering and mechanical properties of β‐SiC powder obtained from waste tires

Synthesis and Characterization of Silicon Carbide Powders Converted from Metakaolin‐Based Geopolymer

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