Influence of ZrO2 and WO3 doping additives on the thermal properties of porous mullite ceramics

Mahņicka-Goremikina, Ludmila; Švinka, Ruta; Švinka, Visvaldis

doi:10.1016/j.ceramint.2018.06.125

Cited by 18 publications

(11 citation statements)

References 19 publications

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“…The results showed that the CTE values of mullite ceramics produced from the industrial wastes ranged from 5.6 to 6.1 × 10 −6 • C −1 . Their values were slightly higher than those of mullite ceramics produced from minerals, which range from 5.0 to 5.7 × 10 −6 • C −1 [46][47][48], the CTE of commercial mullite of 5.5 × 10 −6 • C −1 [49]. Table 4.…”

Section: Thermal Expansionmentioning

confidence: 90%

“…Raw Materials Type of Raw Materials Ceramics Product CTE (× 10 −6 • C −1 )/Temperature Range [5] aluminum sludge + ceramic raw materials Industrial wastes mullite 5.6/20-800 • C [16] coal fly ash + Al dross Industrial wastes mullite 5.8/30-1000 • C [18] coal fly ash + bauxite Industrial wastes porous mullite 6.1/26-1000 • C [23] coal fly ash + bauxite Industrial wastes mullite 5.9/26-1550 • C [46] drift sand + alumina minerals mullite 5.5/30-900 • C [47] alumina + silica + kaolin minerals porous mullite 5.6/200-900 • C [48] ball clay + alumina + kaolin minerals Mullite/alumina 5.0-5.7/400-1200 • C [49] commercial mullite (Duramul 325F) Laboratory grade chemicals Porous mullite 5.5/30-1200 • C…”

Section: Refmentioning

confidence: 99%

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A Review on Synthesis of Mullite Ceramics from Industrial Wastes

et al. 2019

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Some industrial wastes are shown to be useful in the production of mullite ceramics. These industrial wastes are rich in certain metal oxides such as silica (SiO2) and alumina (Al2O3). This gives wastes the potential to be used as a starting material source for mullite ceramics preparation. The purpose of this review paper is to compile and review various mullite ceramics preparation methods that utilized a variety of industrial wastes as starting materials. This review also describes the sintering temperatures and chemical additives used in the preparation and its effects. A comparison of both mechanical strength and thermal expansion of the reported mullite ceramics prepared from various industrial wastes were also addressed in this work.

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Section: Thermal Expansionmentioning

confidence: 90%

Section: Refmentioning

confidence: 99%

A Review on Synthesis of Mullite Ceramics from Industrial Wastes

et al. 2019

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“…For porous materials, thermal conductivity usually increases as porous decreases. 25 In addition, the thermal conductivity of mullite (5.45 W/(m•K)) was significantly higher than that of anorthite (3.67 W/(m•K)). Although the thermal conductivity enlarged to 0.065 W/m•K when mullite content increased to 60 mol%, the value was much lower than that of composites materials from in situ synthesis process.…”

mentioning

confidence: 92%

Microstructure and properties of porous anorthite/mullite whiskers ceramics with high porosity

et al. 2020

Int J Applied Ceramic Tech

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Porous anorthite/mullite whiskers ceramics with high porosity (>91%) and high strength (>0.45 MPa) have been successfully prepared by foam gel‐casting method. Effects of extra mullite whiskers on properties including thermal conductivity and compressive strength at different temperatures were investigated and discussed in terms of microstructure observed through SEM and TEM. The results showed that the addition of extra mullite whiskers in certain content could effectively reduce thermal conductivity, improve the compressive strength both at room and high temperature at same time. When the mullite whiskers content was 20 mol%, the porosity was as high as 91.6 ± 0.19%, the thermal conductivity was low to 0.034 ± 0.003 W/(m·K), and the compressive strength at 1000°C was high to 0.64 ± 0.11 MPa three times to the pure one. Small pores, small grains, and more phase interface or grain boundary caused by the addition of extra mullite whiskers were the main factors for low thermal conductivity. Meanwhile, small pores, closely bonded small grains, and the stable three‐dimension network formed by mullite whiskers helped to improve strength.

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“…This might be explained by the thermal conduction mechanism in porous ceramics. First of all, the thermal conductivity of gas phase in the pores was negligible compared to the solid phases at room temperature, thus, the increasing of volume fractions of pores can significantly reduce thermal conductivity . Thermal energy in most ceramics was transported by lattice vibrations (phonons).…”

Section: Resultsmentioning

confidence: 99%

Preparation and characteristics of porous anorthite ceramics with high porosity and high‐temperature strength

et al. 2019

Int J Applied Ceramic Tech

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High-temperature properties including compressive strength, thermal shock behavior, and thermal conductivity of porous anorthite ceramics with high specific strength were tested and analyzed. The results showed that the prepared materials merit hightemperature compressive strength, thermal stability, and conductivity. With the appropriate fabrication parameters, even though containing 0.33 g/cm 3 bulk density and 88.2% porosity, its compressive strength could reach 2.03 MPa at 1000°C, 147% of that at room temperature; the residual strength ratio kept as 114.7% after a thermal shock at 1200°C. The X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM) showed that anorthite grains refinement and intergranular voids filling by liquid phase were main factors for the high strength. From room temperature to 1200°C, its thermal conductivity only varied from 0.085 to 0.258 W·(m·K) −1 . High porosity, a large number of nanoregions in anorthite grains and amorphous phase in grain boundary were main reasons for low thermal conductivity. K E Y W O R D S anorthite, porous materials, strength, thermal conductivity How to cite this article: Wu L, Li C, Li H, et al. Preparation and characteristics of porous anorthite ceramics with high porosity and high-temperature strength. Int J Appl Ceram Technol. 2020;17:963-973.

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Influence of ZrO2 and WO3 doping additives on the thermal properties of porous mullite ceramics

Cited by 18 publications

References 19 publications

A Review on Synthesis of Mullite Ceramics from Industrial Wastes

A Review on Synthesis of Mullite Ceramics from Industrial Wastes

Microstructure and properties of porous anorthite/mullite whiskers ceramics with high porosity

Preparation and characteristics of porous anorthite ceramics with high porosity and high‐temperature strength

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