Microstructure and mechanical and thermal shock properties of hierarchically porous ceramics

Li, Bo; Yan, Yongda; Jin, Xinxin; Geng, Yanquan; Wang, Shuai; Cao, Maochang; He, Xuan; Li, Ning; Zhuang, Yanli

doi:10.1016/j.ceramint.2021.05.215

Cited by 16 publications

(3 citation statements)

References 49 publications

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“…In Figures 5 and 7, the thermal conductivity and the stress to rupture values of FTC materials before and after sintering are much lower than those of TC. In general, it is explained by the highest porosity of FTC tapes that induces the reduction of both the thermal conductivity 35,42 and the stress to rupture 31,43,44 . The increase in the porosity of FTC after sintering would be due to a swelling effect during debinding at 500°C, even though the microstructural brittleness of green FTC.…”

Section: Discussionmentioning

confidence: 99%

“…In general, it is explained by the highest porosity of FTC tapes that induces the reduction of both the thermal conductivity 35,42 and the stress to rupture. 31,43,44 The increase in the porosity of FTC after sintering would be due to a swelling effect during debinding at 500 • C, even TA B L E 2 Typical values of Weibull modulus m for some materials 30,39,40 though the microstructural brittleness of green FTC. The material is not fully densified during sintering since the largest pores cannot be removed by diffusion at high temperature.…”

Section: Ftc and Tc Manufactured Materialsmentioning

confidence: 99%

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Properties of phyllosilicate‐based porous ceramics shaped by conventional tape casting and freeze tape casting

Barry

Lecomte‐Nana

Seynou³

et al. 2022

Int J Applied Ceramic Tech

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Silicate ceramics were shaped using tape casting (TC) and freeze tape casting (FTC) processes from three clays labeled HCR, KORS, and KCR. These clays exhibited mass content of 77% halloysite-10 Å, 29% kaolinite, and 98% kaolinite minerals, respectively. After casting the slurries, the dried tapes were sintered at 1200 • C. The microstructure changes were characterized before and after sintering using scanning electron microscopy. The apparent porosity of TC samples was lower (36-47 vol.%) compared to values obtained with FTC samples (67-79 vol.%). The latter samples exhibited a highly textured porosity, with micron-sized pores aligned perpendicular to the tape surfaces. Upon sintering, the porosity of TC samples tended to decrease conversely to the case of FTC samples. Such behavior seemed related to the simultaneous effect of organic additives and ice templating. Consequently, the FTC samples showed a relatively low mechanical strength of 3-7 MPa and thermal conductivity of .14-.22 W m −1 K −1 . After sintering, the mullite crystallization contributed to strengthen the bulk materials, helping to compensate for the detrimental effect of porosity on the stress to rupture and on thermal conductivity values.

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Section: Discussionmentioning

confidence: 99%

Section: Ftc and Tc Manufactured Materialsmentioning

confidence: 99%

Properties of phyllosilicate‐based porous ceramics shaped by conventional tape casting and freeze tape casting

Barry

Lecomte‐Nana

Seynou³

et al. 2022

Int J Applied Ceramic Tech

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“…Although the nature of these composites is characterized by a certain amount of porosity resulting in reduced strength, they exhibit low shrinkage during sintering and higher thermal shock resistance compared with dense materials. [17][18][19][20][21][22] On the other hand, dense materials show higher thermal and electrical conductivity, but high shrinkage often impedes the production of large-scale components compared with porous composites. Thus, there are two contradicting demands regarding porosity.…”

Section: Introductionmentioning

confidence: 99%

High‐Temperature Compressive Behavior of Refractory Alumina–Niobium Composite Material

et al. 2022

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The development of coarse‐grained refractory composites combining refractory ceramics with refractory metals provides new approaches for high‐temperature applications. In particular, coarse‐grained Nb‐Al2O3 composites are widely interested due to their promising functional properties such as high thermal shock resistance, low shrinkage and good electrical conductivity. In order to identify and release the potential of these materials in advanced applications, their mechanical behavior should be evaluated. This study presents room‐ and high‐temperature compression behavior up to 1500 °C of Nb‐Al2O3 refractory composites manufactured via castable and extrusion technology. The influences of production method, particle size, open porosity as well as temperature and strain rate are discussed. For comparison, pure niobium and alumina specimens are used as reference materials. The results indicate that Nb‐Al2O3 refractory composites show high ductility at high temperatures. This behavior is also verified with microstructural investigations by scanning electron microscope (SEM).

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Surface Modification for Dispersion Stability of Novel FAl2O3-POE Nanolubricant Using Functional SiO2

Nugroho

Mamat

Zhang

et al. 2022

Proceedings of the 2nd Energy Security and Chemical Engineering Congress

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Microstructure and mechanical and thermal shock properties of hierarchically porous ceramics

Cited by 16 publications

References 49 publications

Properties of phyllosilicate‐based porous ceramics shaped by conventional tape casting and freeze tape casting

Properties of phyllosilicate‐based porous ceramics shaped by conventional tape casting and freeze tape casting

High‐Temperature Compressive Behavior of Refractory Alumina–Niobium Composite Material

Surface Modification for Dispersion Stability of Novel FAl2O3-POE Nanolubricant Using Functional SiO2

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