Ultra-low cost porous mullite ceramics with excellent dielectric properties and low thermal conductivity fabricated from kaolin for radome applications

Zhang, Biao; Ma, Jie; Ye, Jian; Jin, Yicheng; Yang, Chunping; Ding, Junjie; Zhang, Zhiguo; Hou, Zhaoping; Liu, Qiang; Ye, Feng

doi:10.1016/j.ceramint.2019.06.120

Cited by 40 publications

(20 citation statements)

References 19 publications

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“…Due to low density, low thermal conductivity, and high specific strength, porous ceramics show great potential in using as thermal insulators and attract much attention. [1][2][3][4][5] For this usage, anorthite-based porous ceramics showed some advantages because of the relatively low theoretical thermal conductivity. [6][7][8] But the relatively low strength and low melting point restrict its application.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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 mullite ceramics are good insulation materials possessing superior properties like high melting (1850 o C), small thermal expansion, chemical inertness, lightweight and low thermal conductivity [1][2][3][4]. Various strategies/methodologies have been adopted to fabricate them, including sacrificial template [5,6], gel/freeze casting [7,8], particle stacking [9,10], use of pore-former [11,12] as well as foam-gelcasting [13,14]. Compared with other techniques, the foam-gelcasting technique shows several advantages, for example, it is easy to operate, low cost, and scalable, and the resultant products exhibit excellent properties and performance [14,15].…”

Section: Introductionmentioning

confidence: 99%

FOAM-GELCASTING PREPARATION OF Zr Si O₄ MODIFIED POROUS MULLITE CERAMICS

Liu¹

2020

Ceramics - Silikaty

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ZrSiO4 modified mullite-based porous ceramics were fabricated at 1400 o C by using a foam-gelcasting method from industrial grade powder materials. Except for mullite and ZrSiO4 no other phases were identified in the fired samples added with ZrSiO4, implying that at the firing temperature, ZrSiO4 neither decomposed, nor reacted with mullite. In the microstructures of these samples, mullite/ZrSiO4 grains were evenly distributed, and the overall pore sizes were reduced. The addition of ZrSiO4 showed little effect on porosity and bulk density of fired samples, which were respectively around 77% and 0.7g•cm-3. However, it led to the enhanced mechanical strength, and more importantly, the reduced thermal conductivity, especially at high temperatures. When 8 wt% ZrSiO4 was added, flexural and compressive strengths increased respectively to 3.63 and 7.35 MPa, whereas thermal conductivity at 200 and 1000 o C was reduced to 0.160 and 0.277 W•m-1 •K-1 , respectively, which was mainly attributed to the shading effect, decreased size of "large" spherical pores, and more centralized and homogenized pore size distribution.

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“…Mullite is an excellent ceramic material due to the unique properties, such as low coefficient of thermal expansion, high corrosion resistance to acid and alkali, high‐temperature creep resistance, strong thermal shock resistance, high chemical and thermal stability, high permeability, and excellent mechanical properties 1–3 . Mullite ceramics have been widely utilized as metallurgical, glass, ceramic, and other industrial refractory materials 4–6 . They are also widely used as heat‐resistant materials, such as crucibles, protective tubes, and thermocouple tubes for electronic packaging 7–9 .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Mullite ceramics have been widely utilized as metallurgical, glass, ceramic, and other industrial refractory materials. [4][5][6] They are also widely used as heatresistant materials, such as crucibles, protective tubes, and thermocouple tubes for electronic packaging. [7][8][9] Other applications include window materials under harsh chemical conditions and mechanical stress at high temperatures.…”

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confidence: 99%

Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe₂O₃

Zhenying

Lian

Liu

et al. 2021

Int J Applied Ceramic Tech

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Mullite is an excellent ceramic material due to the unique properties, such as low coefficient of thermal expansion, high corrosion resistance to acid and alkali, high-temperature creep resistance, strong thermal shock resistance, high chemical and thermal stability, high permeability, and excellent mechanical properties. [1][2][3] Mullite ceramics have been widely utilized as metallurgical, glass, ceramic, and other industrial refractory materials. [4][5][6] They are also widely used as heatresistant materials, such as crucibles, protective tubes, and thermocouple tubes for electronic packaging. [7][8][9] Other applications include window materials under harsh chemical conditions and mechanical stress at high temperatures. [10][11][12] Mullite has been synthesized using various methods, such as sol-gel process, chemical syntheses, 13,14 co-precipitation, 6,15 hydrothermal reaction, 16,17 flash combustion, [18][19] and chemical vapor deposition. 20,21 However,

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Ultra-low cost porous mullite ceramics with excellent dielectric properties and low thermal conductivity fabricated from kaolin for radome applications

Cited by 40 publications

References 19 publications

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

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

FOAM-GELCASTING PREPARATION OF Zr Si O₄ MODIFIED POROUS MULLITE CERAMICS

Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe₂O₃

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Ultra-low cost porous mullite ceramics with excellent dielectric properties and low thermal conductivity fabricated from kaolin for radome applications

Cited by 40 publications

References 19 publications

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

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

FOAM-GELCASTING PREPARATION OF Zr Si O₄ MODIFIED POROUS MULLITE CERAMICS

Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe2O3

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Phase formation, microstructure development, and mechanical properties of kaolin‐based mullite ceramics added with Fe₂O₃