Mechanical properties, modeling and design of porous clay ceramics

Yakub, I.; Du, Jinglei; Soboyejo, W. O.

doi:10.1016/j.msea.2012.07.038

Cited by 53 publications

(25 citation statements)

References 25 publications

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“…The K IC values in Table 2 were the expected ones for highly porous ceramics and they were compatible with data from the literature [24,54,55]. However, these results must be interpreted carefully, because of the crack-tip blunting mechanism due to the presence of surrounding pores (see Figure 13).…”

Section: Fracture Toughness Of Porous Ceramicssupporting

confidence: 89%

Mechanical Properties of Porous Ceramics

Salvini¹,

Pandolfelli²,

Spinelli³

2018

Recent Advances in Porous Ceramics

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It is widely known that increasing interest in porous ceramics is due to their special properties, which comprise high volumetric porosity (up to 90%) with open or closed pores, and a broad range of pore sizes (micropores: d < 2 nm; mesopores: 50 nm > d > 2 nm and macropores: d > 50 nm). These properties have many uses comprehending macroscaled devices, mesoscaled materials and microscaled pieces. During their usage, these materials are usually submitted to thermal and/or mechanical loading stresses. Therefore, it is a premise to understand how these porous structures behave under thermomechanical stresses to design materials that show adequate properties for the required application. In this context, the aim of this chapter is to review the mechanical properties of macroporous ceramics.

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Section: Fracture Toughness Of Porous Ceramicssupporting

confidence: 89%

Mechanical Properties of Porous Ceramics

Salvini¹,

Pandolfelli²,

Spinelli³

2018

Recent Advances in Porous Ceramics

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“…The samples using OCF showed a mechanical strength higher than those using WS. These results may be related to the pores (Aouba et al, 2016;Wagh et al, 1991;Yakub et al, 2012). The porosity increment leads to decrease thermal conductivity also has an impact on mechanical strength.…”

Section: Thermal and Mechanical Propertiesmentioning

confidence: 95%

Production of clay ceramics using agricultural wastes: Study of properties, energy savings and environmental indicators

Sani

Nzihou

2017

Applied Clay Science

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In this study, agro-wastes were used as additive raw materials for the production of fired clay ceramics. The objectives of this study are to evaluate the impact of adding agro-wastes into clay body on the thermal and mechanical properties of ceramic materials, to determine the net energy consumption and to determine gas emissions during firing process. The clay and agro-wastes were characterized by chemical elemental analysis, thermogravimetric and differential thermal analysis (TGA-DTA). The fired clay ceramics were produced with clay and optimal proportions of wheat straw (WS) and olive core flour (OCF). The thermal and mechanical properties were evaluated by measuring thermal conductivity with hot-disk method and bending test respectively. The results showed that for clay incorporated OCF (4, 8 wt%) and WS (3, 7 wt%), thermal conductivity was decreased by 16 to 30%. However, the mechanical strength of the same samples has slightly decreased respectively. TGA-DTA provided an approach to estimate the heat required or released for both clay and agro-wastes thermal decomposition. The addition of agro-wastes into the clay body showed that energy consumption of fired clay ceramics production decreased to above 36% for clay incorporated 4 wt% OCF (C-4wt %OCF). The energy saving during the firing process was a tangible outcome. In order to determine the impact of the agro-wastes addition, the environmental indicators were discussed for the clay incorporated WS and OCF respectively. Total gas yield released were measured by Micro-GC after the combustion of clay incorporated OCF and WS in fixed bed reactor respectively. The analysis of gas emissions are related to the combustion of organic and inorganic compounds of agro-wastes and clay body, respectively. The CO 2 emissions coming from the combustion of agro-wastes reached up to 4.38% for C-8wt%OCF. However, the CO 2 emissions associated with decarbonatation of clay body decreased. Adding agro-wastes into the clay body results to improving thermal properties without negative impact on the mechanical properties of ceramic materials, also to a significant energy saving and decreasing of the inorganic CO 2 emissions related to the decarbonatation of clay body. The relevance of this work, pointed out in the data presented in regards to the state-of-the art is that the paper is focused on fired clay ceramic properties, on energy savings and on the evaluation of environmental indicators in the laboratory scale.

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“…De acuerdo a estos resultados se concluye que el módulo de Young del compuesto es bajo en comparación con el reportado por otros trabajos realizados en materiales cerámicos similares, los cuales exhiben módulos del orden de 3 GPa hasta 278 GPa [51,52]. Lo anterior, evidencia que el comportamiento obtenido es característico en estos compuestos cerámicos y no es estrictamente una función de la porosidad, sino que a su vez depende de la morfología de poros, distribución del tamaño de poro, la microestructura y fases formadas [49,53].…”

Section: Ensayo De Flexión a Tres Puntosunclassified

Microstructure, physical and mechanical properties of kaolin–diatomite composite reinforced with CaCO3•

Bohórquez

López

Páez

et al. 2019

DYNA

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The present work reports the microstructure, physical and mechanical properties of a material composed of kaolin, diatomite and calcium carbonate reinforcement (CaCO3). The ceramic prototypes were shaped by the slip casting method and sintered at temperatures between 800 °C and 1100 °C. The morphology and average pore size was analyzed by Scanning Electron Microscopy (SEM) and the mineralogical phases were determined by X-Ray Diffraction (XRD). The apparent density was established by the mercury immersion method according to the E – 8B Standard of the Institute of Ceramic Technology (ITC); the percentage of absorption was determined by the boiling method according to ISO 10545-3 standard; linear contraction was studied in three directions: long, wide and high. The study of the mechanical resistance to compression followed the procedure established at ASTM C773–88 standard and the breaking modulus was calculated by the three-point bending test, according to ISO 10545–4. Results show that the material structure is affected with increasing temperature reporting a decrease in quartz phase from 51.16 % to 33.81 %. Percentage of absorption revealed its most significant variation between 950 °C and 1100 °C with a decrease of 21 % approximately. Mechanical resistance values showed wide dispersion which was attributed to the different orientations in which the material failed during each test. According to the pore diameters found, the compound is characterized by being macro and mesoporous facilitating its application in catalysis, photochemistry, microelectronics and other microfiltration media

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Mechanical properties, modeling and design of porous clay ceramics

Cited by 53 publications

References 25 publications

Mechanical Properties of Porous Ceramics

Mechanical Properties of Porous Ceramics

Production of clay ceramics using agricultural wastes: Study of properties, energy savings and environmental indicators

Microstructure, physical and mechanical properties of kaolin–diatomite composite reinforced with CaCO3•

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