Stability of silicon carbide to hydrofluoric, nitric, and sulfuric acids

Krasotkina, N. I.; Yakovleva, V. S.; Voronin, N. I.; Shmitt-Fogelevich, S. P.

doi:10.1007/bf01283422

Cited by 6 publications

(8 citation statements)

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“…This finding does not confirm the previous results of some authors, e.g. [24], which led to the conclusion that the β-SiC (3C) phase decomposes in HF. The corrosion resistance of SiC ceramics depends on the content of other substances contained in the SiC-ceramic binder system.…”

Section: Discussioncontrasting

confidence: 99%

“…The extraordinary corrosion resistance of the ultrapure β-SiC described above is in contrast to an earlier study [23], where the authors found their samples of β-SiC to some extent soluble in hydrofluoric acid. The solubility of β-SiC samples in hydrofluoric acid as reported in [24] was increasing as the sintering temperature (temperature of SiC synthesis) decreased. The authors attributed this observed trend to an increasing amount of imperfections in the crystal lattice with decreasing processing temperature.…”

Section: Resultsmentioning

confidence: 86%

“…Early work on the stability of SiC treated with hydrofluoric acid [23] alone and in a mixture with sulfuric and nitric acids [24] concluded that hexagonal α-SiC (6H-SiC) is stable to acids, while cubic β-SiC (3C-SiC) decomposes in acids (with increasing rate as the synthesis temperature decreases). The higher corrosion resistance observed with materials prepared at higher temperatures is mainly due to better crystallization.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion of Ceramic Silicon Carbide in Hydrofluoric Acid

Brožek¹

2021

Ceramics - Silikaty

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Silicon carbide usable in mechanical or electrical engineering is produced in various purity grades and exhibits a large number of crystal structure variants. As for use in the chemical field, it is commonly stated that it is highly resistant in acid media but not suitable for use in alkaline media. This paper discusses the resistance of compact silicon carbide to hydrofluoric acid. The compact silicon carbide has been prepared by sintering using the SSiC method with or without binders based on scandium oxide Sc 2 O 3 and calcium fluoride CaF 2 . The purest silicon carbide sample of cubic 3C structure sintered without a binder was almost insoluble in hydrofluoric acid. It has been shown, however, that pure silicon carbide is perfectly insoluble in hydrofluoric acid irrespective of the structure variants detected in the samples (3C, 4H, 6H, 15R). The corrosion stability of the compact ceramics is affected by the residual SiO 2 content (together with other impurities) in imperfect SiC preparations, and it is influenced by the choice and chemical properties of the chosen ceramic binder as well.

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Section: Discussioncontrasting

confidence: 99%

Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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Corrosion of Ceramic Silicon Carbide in Hydrofluoric Acid

Brožek¹

2021

Ceramics - Silikaty

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“…According to previous literature, α -SiC and β -SiC have different resistances to acid etching [ 22 ]. Krasotkina et al reported that α-SiC is stable in the boiling mixture of HF, HNO 3 , and H 2 SO 4 acids, whereas β-SiC could be easily etched by the mixture [ 25 ]. Lutsenko et al also found that β-SiC could be completely dissolved in the mixture of HF and HNO 3 , whereas industrial SiC powder consisting of both α-SiC and β-SiC could be etched only partially [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

Avoiding Loss of Catalytic Activity of Pd Nanoparticles Partially Embedded in Nanoditches in SiC Nanowires

et al. 2009

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Nanoditches from selective etching of periodically twinned SiC nanowires were employed to hinder the migration and coalescence of Pd nanoparticles supported on the nanowires, and thus to improve their catalytic stability for total combustion of methane. The results show that the etched Pd/SiC catalyst can keep the methane conversion of almost 100% while the unetched one has an obvious decline in the catalytic activity from 100 to 82% after ten repeated reaction cycles. The excellent catalytic stability originates from the limitation of the nanoditches to the migration and growth of Pd nanoparticles.

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“…Wet etching of SiC has not been studied intensively yet. Krasotkina first reported 21 that hot HF/HNO 3 mixture is able to etch the cubic form of SiC,…”

Section: Resultsmentioning

confidence: 99%

Preparation of small silicon carbide quantum dots by wet chemical etching

et al. 2012

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Fabrication of nanosized silicon carbide (SiC) crystals is a crucial step in many biomedical applications. Here we report an effective fabrication method of SiC nanocrystals based on simple electroless wet chemical etching of crystalline cubic SiC. Comparing an open reaction system with a closed reaction chamber, we found that the latter produces smaller nanoparticles (less than 8 nm diameter) with higher yield. Our samples show strong violet-blue emission in the 410-450 nm region depending on the solvents used and the size. Infrared measurements unraveled that the surface of the fabricated nanoparticles is rich in oxidized carbon. This may open an opportunity to use standard chemistry methods for further biological functionalization of such nanoparticles.

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Stability of silicon carbide to hydrofluoric, nitric, and sulfuric acids

Cited by 6 publications

References 0 publications

Corrosion of Ceramic Silicon Carbide in Hydrofluoric Acid

Corrosion of Ceramic Silicon Carbide in Hydrofluoric Acid

Avoiding Loss of Catalytic Activity of Pd Nanoparticles Partially Embedded in Nanoditches in SiC Nanowires

Preparation of small silicon carbide quantum dots by wet chemical etching

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