Chemical Corrosion of Liquid-Phase Sintered SiC in Acidic/Alkaline Solutions Part 1. Corrosion in HNO3 Solution

Zhang, Lei; Zhang, Ming; He, Xinnong; Tang, Wenming

doi:10.1007/s11665-016-1916-8

Cited by 7 publications

(3 citation statements)

References 12 publications

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“…Large number of corrosion pits and surface cracks were observed in alkali corroded sample, which also indicated severity of corrosion in alkali compare to acid. The bamboo leaf‐like corrosion pits and reduction in bending strength were reported by acid corrosion of LPS‐SiC ceramics . The residual strength of the materials after 240 hours in acid and base corrosion was 19.32 MPa and 2.44 MPa, respectively.…”

Section: Resultsmentioning

confidence: 94%

“…The bamboo leaf-like corrosion pits and reduction in bending strength were reported by acid corrosion of LPS-SiC ceramics. 45 The residual strength of the materials after 240 hours in acid and base corrosion was 19.32 MPa and 2.44 MPa, respectively. The results indicated higher mechanical stability in acid medium was due to the lower degree of chemical attack of the grains and secondary bond phases between adjacent grains.…”

Section: Corrosion Tests Under Acid and Base Mediummentioning

confidence: 94%

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Processing and properties of porous SiC ceramics prepared by yttrium aluminum garnet infiltration

Baitalik

Kayal

Chakrabarti

2017

Int J Applied Ceramic Tech

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Oxide bonded porous SiC ceramics were synthesized by infiltrating a liquid precursor of yttrium aluminum garnet into porous powder compact of SiC followed by sintering at 1300‐1500°C in air. Infiltration rate was estimated using weight gain by the liquid precursor sol into porous SiC powder compact as a function of time and was explained by Darcy's and Ficks's laws. The effects of SiC particle sizes and sintering temperatures on the formation of bonding phases, microstructure, SiC oxidation degree, flexural strength, porosity, and pore size distribution of porous SiC ceramics were studied. Various crystalline oxide phases were detected by XRD analysis. Depending on the starting SiC powder sizes and sintering temperatures, the porosity of the final ceramics varied nearly in the range of ~29‐41 vol. % with the variation of average pore diameter between ~5 and 30 μm. Flexural strength varied from 41 to 8 MPa depending on porosity. The effect of corrosion on oxide bond phases was investigated in strong acidic and basic medium at 90°C. The ceramics showed better corrosion resistance in acidic medium compared to basic medium. In basic medium, significant reduction in flexural strength (~42%) was arisen.

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Section: Resultsmentioning

confidence: 94%

Section: Corrosion Tests Under Acid and Base Mediummentioning

confidence: 94%

Processing and properties of porous SiC ceramics prepared by yttrium aluminum garnet infiltration

Baitalik

Kayal

Chakrabarti

2017

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

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“…12 It has been determined that nonuniform distribution of the secondary phases leads to selective corrosion of the LPS-SiC specimens in the HNO 3 solution. 13 The bamboo-leaf-like BAS regions in the LPS-SiC are more active than Y 2 Si 2 O 7 in the acidic solution, resulting in in-situ formation of the bamboo-leaf-like corrosion pits on the SiC specimen surface. However, when the LPS-SiC specimens are etched in the NaOH solution, no selective corrosion, but uniform corrosion is observable.…”

Section: Corrosion At Room-temperaturementioning

confidence: 99%

Chemical corrosion of liquid-phase sintered SiC in NaOH aqueous solution

Zhang

Mao

Chen

et al. 2016

Corrosion Engineering, Science and Technology

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Corrosion behaviour of the liquid-phase sintered SiC ceramics (LPS-SiC) was studied through exploration of weight loss, strength reduction and morphology evolution of the SiC specimens etched in the room-temperature/70°C 6.12 mol/L (20 wt-%) NaOH aqueous solutions. As a comparison, corrosion of the reaction-bonded SiC ceramics (RB-SiC) was also investigated. The results show that corrosions of the SiC specimens mainly contain homogeneous dissolution of the secondary-phase oxides in the LPS-SiC and that of Si in the RB-SiC, and peel-off of the SiC particles, resulting in increase of the surface roughness, weight loss and strength reduction of the SiC ceramics. As dipped in the 70°C NaOH solution, corrosion pores and channels form in the sublayer, leading to rapid increase of weight loss and strength reduction of the LPS-SiC. No matter in the room-temperature or 70°C NaOH solution, the LPS-SiC always has a higher corrosion resistance than the RB-SiC.

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Preparation and characterization of macroporous SiC ceramic membrane for treatment of waste water

et al. 2017

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Chemical Corrosion of Liquid-Phase Sintered SiC in Acidic/Alkaline Solutions Part 1. Corrosion in HNO3 Solution

Cited by 7 publications

References 12 publications

Processing and properties of porous SiC ceramics prepared by yttrium aluminum garnet infiltration

Processing and properties of porous SiC ceramics prepared by yttrium aluminum garnet infiltration

Chemical corrosion of liquid-phase sintered SiC in NaOH aqueous solution

Preparation and characterization of macroporous SiC ceramic membrane for treatment of waste water

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