Sea‐Salt Corrosion and Strength of a Sintered α‐Silicon Carbide

Fox, Dennis S.; Cuy, Michael D.; Nguyen, QuynhGiao N.

doi:10.1111/j.1151-2916.1998.tb02517.x

Cited by 12 publications

(5 citation statements)

References 11 publications

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“…Many researchers had investigated the corrosion behavior of ceramic materials . The ceramics were corroded by different corrosive medium, such as hydrofluoric acid, hydrochloric acid, sulfuric acid, phosphoric acid, and caustic soda .…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of alumina‐based ceramic core materials in caustic alkali solutions

Gao

Wang

Yin

et al. 2018

Int J Applied Ceramic Tech

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Corrosion behaviors of the porous alumina‐based ceramic core materials in KOH and NaOH solution were investigated. Corrosion tests were carried out at 100°C, 150°C, and 200°C, and the concentration of KOH and NaOH was 50, 67, and 75 wt%, respectively. The results indicated that the optimal concentration was 67 wt% for KOH solution and 50 wt% for NaOH solution, respectively. Increasing corrosion temperature and prolonging corrosion time were helpful to enhance the corrosion effect, and temperature played an extra important role during the whole corrosion process. NaOH solution was better than KOH solution for corrosion at the same temperature and concentration.

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Section: Introductionmentioning

confidence: 99%

Corrosion behavior of alumina‐based ceramic core materials in caustic alkali solutions

Gao

Wang

Yin

et al. 2018

Int J Applied Ceramic Tech

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“…Silicon carbide corrosion by salts that decompose to a reactive oxide in an oxidising environment results in a reduction in strength, caused by surface pitting, grain boundary etching and deposition of alkali silicates . SiC is corroded by molten Na 2 CO 3 in three stages: weight loss because of dissolution of any surface SiO 2 scale, oxidation of SiC to SiO 2 and formation of a protective oxide barrier that protects the SiC from further attack.…”

Section: Emissions and Abatementmentioning

confidence: 99%

Alkali, boron and phosphorous removal from coal‐derived syngas: review and thermodynamic considerations

Dolan

Ilyushechkin

McLennan

et al. 2011

Asia-Pacific J Chem Eng

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Alkalis are highly corrosive towards materials associated with syngas processing and utilisation, including ceramic particulate filters and metallic components. The removal of alkali species, consequently, is an important step in the cleaning of coal and biomass-derived syngas. The origins of the alkali contaminant govern the ability of specific sorbents to remove these species via chemical means. Alkali salt removal is dependent on the formation of an acid halide species, a reaction, which in the absence of H 2 O, involves hydrogen and carbon dioxide. This reaction becomes increasingly unfavourable above 1000 C, but below this temperature, equilibrium conversion approaches 100%. The fluxing of a gasifier slag, which is often necessary to reduce viscosity to a level that allows tapping, reduces its ability to absorb alkali halides. This effect however was not observed with oxide-based alkalis, which shows strong affinity for gasifier slag regardless of fluxing, up to 1600 C. Furthermore, there is a potential for removal of boron and phosphorous contaminants using these same sorbents. In a complete high-temperature, dry gas cleaning sequence, alkali removal would ideally be undertaken prior (or simultaneously to) halide removal and prior to sulfur removal.

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“…Effects of exposure to the salt-fog on CMCs' performance have been also investigated [20][21][22][23][24]. The contribution of fiber strength loss on the degradation of the tensile behavior of Nextel TM 720/aluminosilicate composites after exposure to salt-fog (ASTM B117) was investigated in [22].…”

Section: Introductionmentioning

confidence: 99%

Effects of combustion and salt-fog exposure on fatigue behavior of two ceramic matrix composites and a superalloy

2015

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Tension-tension fatigue behavior of two ceramic matrix composites (CMCs), SiC/SiC (Nicalon TM / SiC) & oxide/oxide (Nextel TM 720/AS), and a superalloy (René 41) was characterized under combustion environment as well as under alternate salt-fog exposure for 4 h and combustion fatigue for 6 h. The run-out limit was 25 h (90,000 cycles) of fatigue. Test temperatures were 900, 1050, and 1050°C for René 41, SiC/SiC, and oxide/oxide CMCs, respectively, and the applied maximum fatigue stress was 62 MPa. All three materials survived up to 25 h under combustion fatigue without any exposure to salt. René 41 and Nicalon TM /SiC survived up to 25 h (90,000 cycles) under the alternate exposure of salt-fog and combustion fatigue. However, exposure to salt-fog exposure (5 wt%) had very detrimental effect on the combustion fatigue resistance of Nextel TM 720/AS. The reduction in salt concentration to 0.5 wt% had less detrimental effect. These tests were supplemented with more tests, where applied stress level, test temperature, and salt concentration were changed. Out of these three gas turbine engine materials, Nicalon TM /SiC exhibited better fatigue performance in terms of applied temperature and stress level under combustion condition as well as when exposed to alternate salt-fog and combustion.

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Sea‐Salt Corrosion and Strength of a Sintered α‐Silicon Carbide

Cited by 12 publications

References 11 publications

Corrosion behavior of alumina‐based ceramic core materials in caustic alkali solutions

Corrosion behavior of alumina‐based ceramic core materials in caustic alkali solutions

Alkali, boron and phosphorous removal from coal‐derived syngas: review and thermodynamic considerations

Effects of combustion and salt-fog exposure on fatigue behavior of two ceramic matrix composites and a superalloy

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