Implementation of image analysis on thermal shock and cavitation resistance testing of refractory concrete

Martinović, Sanja; Dojčinović, Marina; Dimitrijević, Marija; Devečerski, Aleksandar; Matović, Branko; Volkov‐Husović, Tatjana

doi:10.1016/j.jeurceramsoc.2010.07.041

Cited by 26 publications

(38 citation statements)

References 20 publications

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“…Research results concerning the applications of different classes of materials, including ceramics and composite materials for a similar use, were published in the last decade. [1][2][3][4][5][6][7][8][9][10] Different types of ceramics based on silicon nitride and zirconia, as well as alumina-based ceramic materials were investigated in the conditions of cavitation erosion. 2,[4][5][6][7][8][9] In numerous papers [1][2][3][4][5][6][7][8][9][10][11][12] related to the investigations of the erosion rate of these materials, attempts were made to investigate the type of cracking as well as the influence of the grain sizes and the contents of different compounds and phases on the resistance of the materials to the erosive wear.…”

Section: Introductionmentioning

confidence: 99%

Erosive wear resistance of silicon carbide-cordierite ceramics: influence of the cordierite content

Pošarac–Marković¹,

Veljović²,

Devečerski³

2015

Mater. Tehnol.

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A cordierite/SiC composite was created in situ with reactive sintering at 1250°C and 1300°C. The cordierite precursor was made from commercially available spinel, alumina and quartz and was mixed with the comercial SiC powder to obtain composite materials during the sintering. It was found that cordierite particles bind efficiently with the SiC powder during sintering and that reactive sintering is an effective way to produce ceramics at a relativly low temperature. The goal of this investigation was to check the possibilities of using the silicon carbide-cordierite composite as a material resistant to the erosive wear. The fluid dynamic system of the experimental methodology was used here to produce ultrasonic erosive wear. Two kinds of SiC/cordierite samples were investigated, KS 50 and KS 30, with different mass contents of cordierite (w = 50 % and w = 30 % of cordierite). The mass loss and the level of surface degradation were measured before and during the experiment. The level of surface degradation of the samples was monitored using the Image-Pro Plus program for the image analysis. It was found that after 150 min the mass loss was below 1.3 mg and the surface degradation was below 7 %. The obtained results indicated that both samples exhibited an excellent erosion resistance during the cavitation experiment. Keywords: ceramic-matrix composites (CMCs), damage tolerance, non-destructive testing, cavitation-erosion diameter and area Kompozit kordierit-SiC je bil izdelan in-situ z reakcijskim sintranjem pri 1250°C in 1300°C. Kordieritna predoblika, izdelana iz komercialno dostopnega {pinela, aluminijevega oksida in kremena, je bila zme{ana s prahom komercialnega SiC, da bi dobili s sintranjem kompozitni material. Ugotovljeno je, da delci kordierita u~inkovito ve`ejo SiC-prah med sintranjem in da je reakcijsko sintranje u~inkovita metoda za izdelavo keramike pri relativno nizki temperaturi. Cilj te raziskave je preveriti mo`nost uporabe SiC-kordieritnega materiala, odpornega proti obrabi z erozijo. Za ultrazvo~no erozijsko obrabo je bila uporabljena eksperimentalna metoda fluidnega dinami~nega sistema. Preiskovani sta bili dve vrsti vzorcev SiC-kordierit, KS 50 in KS 30, z razli~nima masnima vsebnostima kordierita (w = 50 % in w = 30 % kordierita). Masni dele`obrabe povr{ine je bil izmerjen pred preizkusom in po njem. Stopnja degradacije povr{ine vzorcev je bila ugotovljena s programom za analizo slik Image Pro Plus. Ugotovljeno je bilo, da je bila izgube mase po 150 min manj{a od 1,3 mg in degradacija povr{ine manj{a od 7 %. Dobljeni rezultati ka`ejo, da imata med preizkusom kavitacije oba vzorca odli~no odpornost proti eroziji. Klju~ne besede: kompozit s kerami~no osnovo (CMCs), toleranca po{kodb, neporu{ne preiskave, premer in povr{ina erozije pri kavitaciji

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Section: Introductionmentioning

confidence: 99%

Erosive wear resistance of silicon carbide-cordierite ceramics: influence of the cordierite content

Pošarac–Marković¹,

Veljović²,

Devečerski³

2015

Mater. Tehnol.

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“…The major contributors to developing strength are the hydrothermal reaction products of slag, suggesting that if the Class F fly ash is employed as a resource in the geopolymer synthesis, we may have to incorporate additional cementitious material into the geopolymer binder to ensure that the cured cement adequately develops a desirable strength under hydrothermal conditions. As this additional cementitious binder, our particular interest lay in using calcium aluminum refractory cement consisting of three major chemical constituents, calcium monoaluminate, calcium dialuminate, and α-aluminum oxide because of its great thermal resistance [14][15][16]. Despite this highly valuable property, its major drawback for subterranean applications is its very fast set that leaves insufficient time for placing the material in a well.…”

Section: Introductionmentioning

confidence: 99%

Thermal Shock-resistant Cement

Sugama¹,

Pyatina²,

Gill³

2012

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We studied the effectiveness of sodium silicate-activated Class F fly ash in improving the thermal shock resistance and in extending the onset of hydration of Secar #80 refractory cement. When the dry mix cement, consisting of Secar #80, Class F fly ash, and sodium silicate, came in contact with water, NaOH derived from the dissolution of sodium silicate preferentially reacted with Class F fly ash, rather than the #80, to dissociate silicate anions from Class F fly ash. Then, these dissociated silicate ions delayed significantly the hydration of #80 possessing a rapid setting behavior. We undertook a multiple heating -water cooling quenching-cycle test to evaluate the cement's resistance to thermal shock. In one cycle, we heated the 200C-autoclaved cement at 500C for 24 hours, and then the heated cement was rapidly immersed in water at 25C. This cycle was repeated five times. The phase composition of the autoclaved #80/Class F fly ash blend cements comprised four crystalline hydration products, boehmite, katoite, hydrogrossular, and hydroxysodalite, responsible for strengthening cement. After a test of 5-cycle heat-water quenching, we observed three crystalline phase-transformations in this autoclaved cement: boehmite  -Al 2 O 3 , katoite  calcite, and hydroxysodalite  carbonated sodalite. Among those, the hydroxysodalite  carbonated sodalite transformation not only played a pivotal role in densifying the cementitious structure and in sustaining the original compressive strength developed after autoclaving, but also offered an improved resistance of the #80 cement to thermal shock. In contrast, autoclaved Class G well cement with and without Class F fly ash and quartz flour failed this cycle test, generating multiple cracks in the cement. The major reason for such impairment was the hydration of lime derived from the dehydroxylation of portlandite formed in the autoclaved cement, causing its volume to expand.4

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“…Kristalna struktura heksagonalnog SiC, politipovi 2H,4H i 6H [17] Najzastupljeniji polimorf, α-silicijum-karbid, formira se na temperaturama iznad 1700°C i ima heksagonalnu strukturu prikazanu na slici 1.1. β-silicijum-karbid, ima kristalnu strukturu cink-sulfida ( sfalerit ), slika 1.2., sličnu strukturi dijamanta i formira se na temperaturama ispod 1700°C. Slika 1.2.…”

Section: H-sicunclassified

“…Slika 1.2. Kristalna struktura teseralnog SiC 3C [17] Silicijum-karbid se u prirodi javlja kao ekstremno redak mineral po imenu Moisanit.…”

Section: H-sicunclassified

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Synthesis and characterization of ceramic composite materials based on silicon-carbide and cordierite

Pošarac–Marković¹

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Implementation of image analysis on thermal shock and cavitation resistance testing of refractory concrete

Cited by 26 publications

References 20 publications

Erosive wear resistance of silicon carbide-cordierite ceramics: influence of the cordierite content

Erosive wear resistance of silicon carbide-cordierite ceramics: influence of the cordierite content

Thermal Shock-resistant Cement

Synthesis and characterization of ceramic composite materials based on silicon-carbide and cordierite

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