The preparation and properties of high-strength porous mullite ceramics by a novel non-toxic gelcasting process

Li, Xiang; Tao, Mengya; Pan, Mengbo; Liu, Wei; Gao, Zhengxia; Yuan, Hao; Ma, Chengliang

doi:10.1016/j.jeurceramsoc.2022.06.050

Cited by 33 publications

(11 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interestingly, there were two series of macropores discernible in the SiC ceramics fabricated by the foaming method, forming unique hierarchically macroporous structures: these are the 1st modal macropores with pore sizes ranging from 0.5 to 3 mm and the 2nd modal pores with pore size approximately 2 μm. To our knowledge, the conventional foaming approach often produces a monomodal porous structure [ 34 , 35 ]. In contrast, SiC porous ceramics with a hierarchically macroporous structure, as reported here, were obtained in a facile way.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of SiC Porous Ceramics by Foaming Method

et al. 2023

View full text Add to dashboard Cite

In this work, hierarchically porous SiC ceramics were prepared via the foaming method. Porous ceramics with tunable, uniform, and bimodal pore structures were successfully fabricated in a facile way. The formation mechanisms of the 1st and 2nd modal macropores are the H2O2 foaming process and SiC particle overlap, respectively. The effect of pore-foaming agent amount, foaming temperature, and surfactant was investigated. According to the results, with increasing H2O2 amount, the porosity, pore size, and interconnectivity of the 1st modal pores increased, whereas bulk density and strength decreased. The porosity increased while the strength decreased as the foaming temperature increased. Surfactants increased pore interconnectivity and porosity. When the foaming temperature was 85 °C, and the addition of H2O2 was 5 wt.%, the porosity, bulk density, flexural strength, and compressive strength were 56.32%, 2.8301 g/cm3, 11.94 MPa, and 24.32 MPa, respectively. Moreover, SiC porous ceramics exhibited excellent corrosion resistance to acids and alkalis.

show abstract

Section: Resultsmentioning

confidence: 99%

Fabrication of SiC Porous Ceramics by Foaming Method

et al. 2023

View full text Add to dashboard Cite

show abstract

“…With the increase of temperature to 2000 °C (Figure 4d), the strength of the samples is slightly reduced (102 MPa at 10% strain and 692 MPa at 49% strain); additionally, the stress-strain curve becomes smoother (the zigzag has disappeared), demonstrating Weibull distribution regarding the compressive strength of tested samples at a porosity range of 45-55%. c) Strength versus porosity of the 9HEB samples compared to the reported porous ceramics, such as SiC, [3,15,[30][31][32][33] mullite, [34][35][36][37][38] Si 3 N 4 -SiC, [39] Si 3 N 4 , [40] Al 2 O 3 , [41] SiO 2 , [42,43] ZrB 2 -SiC, [44,45] 𝛾-Y 2 Si 2 O 7 , [46,47] ZrC, [48,50] ZrC-SiC, [49] HfC, [50] AlN, [51] SiOC, [52] Anorthite, [53] and ZrO 2 -Al 2 O 3 . [8] d) In situ compressive stress-strain curves of the samples at elevated temperatures.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…b)Weibull distribution regarding the compressive strength of tested samples at a porosity range of 45-55%. c) Strength versus porosity of the 9HEB samples compared to the reported porous ceramics, such as SiC,[3,15,[30][31][32][33] mullite,[34][35][36][37][38] Si 3 N 4 -SiC,[39] Si 3 N 4 ,[40] Al 2 O 3 ,[41] SiO 2 ,[42,43] ZrB 2 -SiC,[44,45] 𝛾-Y 2 Si 2 O 7 ,[46,47] ZrC,[48,50] ZrC-SiC,[49] HfC,[50] AlN,[51] SiOC,[52] Anorthite,[53] and ZrO 2 -Al 2 O 3 [8]. d) In situ compressive stress-strain curves of the samples at elevated temperatures.…”

mentioning

confidence: 99%

Ultrastrong and High Thermal Insulating Porous High‐Entropy Ceramics up to 2000 °C

Wen,

Tang,

Liu

et al. 2024

Advanced Materials

View full text Add to dashboard Cite

High mechanical load‐carrying capability and thermal insulating performance are crucial to thermal‐insulation materials under extreme conditions. However, these features are often difficult to achieve simultaneously in conventional porous ceramics. Here, for the first time, we report a multiscale structure design and fast fabrication of 9‐cation porous high‐entropy diboride ceramics via an ultrafast high‐temperature synthesis technique that can lead to exceptional mechanical load‐bearing capability and high thermal insulation performance. With the construction of multiscale structures involving ultrafine pores at the microscale, high‐quality interfaces between building blocks at the nanoscale, and severe lattice distortion at the atomic scale, our materials with a ∼50% porosity exhibit an ultrahigh compressive strength of up to ∼337 MPa at room temperature and a thermal conductivity as low as ∼0.76 W m−1 K−1. More importantly, they demonstrate exceptional thermal stability, with merely ∼2.4% volume shrinkage after 2000°C annealing. They also show an ultrahigh compressive strength of ∼690 MPa up to 2000°C, displaying a ductile compressive behavior. The excellent mechanical and thermal insulating properties offer an attractive material for reliable thermal insulation under extreme conditions.This article is protected by copyright. All rights reserved

show abstract

“…The thermal conductivity and cost of the products with Al 2 O 3 as the binder are higher . In comparison, mullite (3Al 2 O 3 ·2SiO 2 ), which is the only stable compound in the binary Al 2 O 3 -SiO 2 system, possesses a relatively low thermal conductivity, excellent thermal shock resistance, high melting point, and good economic efficiency. − Thus, mullite can be one potential candidate to prepare lamellas with good high temperature resistance and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

Cuttlefish-Bone-Structure-like Lamellar Porous Fiber-Based Ceramics with Enhanced Mechanical Performances

Zhang

Guo

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Porous fiber-based ceramics have been widely applied in various fields because of their excellent thermal insulation property and high thermal stability property. However, designing porous fibrous ceramics with enhanced comprehensive performances, such as low density, low thermal conductivity, and high mechanical properties at both room temperature and high temperature, is still a challenge and the future development trend. Hence, based on the lightweight cuttlefish bone that possesses a “wall-septa” structure with excellent mechanical performance, we design and fabricate a novel porous fibrous ceramic with the unique fiber-based dual structure of lamellas by the directional freeze-casting method and systematically investigate the effects of lamellar components on the microstructure and mechanical performances of the product. For the desired cuttlefish-bone-structure-like lamellar porous fiber-based ceramics (CLPFCs), the porous framework formed by the overlapping of transversely arranged fibers helps to reduce the density and thermal conductivity of the product, and the longitudinally arranged lamellar structure replaces traditional binders and plays an important role in improving the mechanical properties in the direction parallel to the X–Z plane. Compared with traditional porous fibrous materials reported in the literature, the CLPFCs with an Al2O3/SiO2 molar ratio of 1:2 in the lamellar component exhibits prominent comprehensive performances, such as low density, excellent thermal insulation property, and outstanding mechanical performances at both room temperature and high temperature (3.46 MPa at 1300 °C), indicating that the CLPFCs are a promising candidate for applications in high-temperature thermal insulation systems.

show abstract

The preparation and properties of high-strength porous mullite ceramics by a novel non-toxic gelcasting process

Cited by 33 publications

References 50 publications

Fabrication of SiC Porous Ceramics by Foaming Method

Fabrication of SiC Porous Ceramics by Foaming Method

Ultrastrong and High Thermal Insulating Porous High‐Entropy Ceramics up to 2000 °C

Cuttlefish-Bone-Structure-like Lamellar Porous Fiber-Based Ceramics with Enhanced Mechanical Performances

Contact Info

Product

Resources

About