High-temperature mechanical behavior of compact carbon-bonded alumina based on a pitch-free lactose-tannin binder system

Wu, Xian; Weidner, Anja; Aneziris, Christos G.; Biermann, Horst

doi:10.1016/j.ceramint.2022.12.192

Cited by 6 publications

(9 citation statements)

References 18 publications

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“…In particular, the increase rate (slope) of the samples compressed at 1800 °C is larger than that at 2000 °C, which is in accordance with the weakening effects of atomic bonds at high temperatures. Compared to the reported high-temperature porous ceramics, our synthesized 9PHEBs present a much better compressive strength at elevated temperatures (Figure 4f; and Table S4, Supporting Information), [54][55][56][57][58][59] demonstrating that they are reliable for use in harsh environments.…”

Section: Mechanical Propertiesmentioning

confidence: 69%

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

Wen,

Tang,

Liu

et al. 2024

Advanced Materials

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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

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Section: Mechanical Propertiesmentioning

confidence: 69%

“…e) Stress-relative porosity curves of the samples were tested at 1800 and 2000 °C. f) Strength versus testing temperature of the 9HEBs compared to anorthite, [54] cordierite, [55] Al 2 O 3 , [56,57] SiC, [58] and Yb 2 SiO 5 . [59] the weaker bonding at an elevated temperature.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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

Wen,

Tang,

Liu

et al. 2024

Advanced Materials

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“…Two strategies were applied for the formulation of the L-T-based binder system: pitch reduction [29] and pitch replacement [30]. In the first case, 80 wt% of Carbores P was replaced by lactose and tannin, i.e.…”

Section: Manufacturementioning

confidence: 99%

“…As the result, specimens with L:T = 1:1 and 1:5 could not be machined due to critical cracks appearing after coking, and specimens with L:T = 1:2 and 2:1 were highly porous. High-quality 1 based on the pitch-free L-T binder system with comparable bulk density and porosity were prepared [30]. According to mercury intrusion porosimetry measurements, the specimens exhibited monomodal pore size distribution [30].…”

Section: Physical and Microstructural Propertiesmentioning

confidence: 99%

“…High-quality 1 based on the pitch-free L-T binder system with comparable bulk density and porosity were prepared [30]. According to mercury intrusion porosimetry measurements, the specimens exhibited monomodal pore size distribution [30]. SEM images of the sections of coked cylindrical specimens showed all microstructural features such as alumina particles, pores and isolated carbonaceous bonding aggregates (Fig.…”

Section: Physical and Microstructural Propertiesmentioning

confidence: 99%

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High-Temperature Strength and Form Stability of Compact and Cellular Carbon-Bonded Alumina

Biermann,

Weidner,

2024

Springer Series in Materials Science

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To prove the applicability of carbon-bonded refractories on basis of Al2O3-C for the filtration of metal melts, their mechanical properties such as compression and bending strength were investigated at elevated temperatures up to 1500 °C. The tests have been carried out on compact specimens and on real filter structures without and with functional coatings. Fracture mechanical tests were performed at room temperature and 1400 °C. In a further approach, the residual strength after contact of the filters with molten steel was determined at elevated temperatures. In addition, a new environmentally friendly binder system based on tannin and lactose has been evaluated.

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Fracture mechanical behavior of fine-grained carbon-bonded alumina at room and high temperature

Solarek

Henkel

et al. 2023

Ceramics International

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High-temperature mechanical behavior of compact carbon-bonded alumina based on a pitch-free lactose-tannin binder system

Cited by 6 publications

References 18 publications

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

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

High-Temperature Strength and Form Stability of Compact and Cellular Carbon-Bonded Alumina

Fracture mechanical behavior of fine-grained carbon-bonded alumina at room and high temperature

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