Preparation and application of ZrC-coated flake graphite for Al2O3-C refractories

Wang, Xing; Chen, Yang; Yu, Chao; Ding, Jun; Guo, Ding; Deng, Chengji; Zhu, Hao

doi:10.1016/j.jallcom.2019.02.239

Cited by 52 publications

(9 citation statements)

References 36 publications

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“…Figure 9 shows the specific surface area of BN synthesized at different temperatures, with and without salt. The synthesis temperature was 900–1100 °C, and the specific surface area of the BN synthesized by MSS 42–49 method is 142.61–294.26 m 2 /g. The specific surface area of the BN synthesized at 1000 °C is the largest, at 294.26 m 2 /g.…”

Section: Resultsmentioning

confidence: 99%

Low temperature synthesis via molten-salt method of r-BN nanoflakes, and their properties

Chen

Wang

et al. 2019

Sci Rep

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r-BN nanoflakes were synthesized using KBH4 and NH4Cl as the main raw material in a high-purity nitrogen atmosphere. The effects of salt and salt-free conditions and heating temperature on the synthesis of BN were studied. The molten-salt method was used to synthesize BN at 650 °C, which was 250 °C lower than the BN synthesis method without salt. Furthermore, at 1000 °C the prepared flake-like BN crystals showed good crystallinity, uniform morphology, a particle diameter of 200–300 nm, and a thickness of 40–70 nm. Moreover, the specific surface area of BN was 294.26 m2/g. In addition, the BN synthesized at 1100 °C had a large elastic modulus value and good oxidation resistance.

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Section: Resultsmentioning

confidence: 99%

Low temperature synthesis via molten-salt method of r-BN nanoflakes, and their properties

Chen

Wang

et al. 2019

Sci Rep

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“…[1][2][3][4] Currently, Al 2 O 3 -C refractories mainly consist of carbon from graphite and coked binders as well as dense corundum aggregates and powders. [4][5][6][7] A factor limiting Al 2 O 3 -C refractories has been the low strength of their matrix resulting primarily from the sintering inertness of carbon as a covalent-bonded materia, [5][6][7][8][9][10][11] because the carbon in the matrix impedes a tight bonding between the corundum particles. Therefore, increasing the strength of Al 2 O 3 -C refractories has always been the focus of numerous investigations.…”

Section: Introductionmentioning

confidence: 99%

“…Al 2 O 3 ‐C refractories exhibit excellent thermal shock and high slag resistance, resulting in the widespread use as functional refractories in metallurgical industries 1–4 . Currently, Al 2 O 3 ‐C refractories mainly consist of carbon from graphite and coked binders as well as dense corundum aggregates and powders 4–7 . A factor limiting Al 2 O 3 ‐C refractories has been the low strength of their matrix resulting primarily from the sintering inertness of carbon as a covalent‐bonded materia, 5–11 because the carbon in the matrix impedes a tight bonding between the corundum particles.…”

Section: Introductionmentioning

confidence: 99%

Enhanced mechanical properties of lightweight Al₂O₃‐C refractories reinforced by combined one‐dimensional ceramic phases

Chen

Yan

Schafföner

et al. 2021

Int J Applied Ceramic Tech

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We prepared a new lightweight Al2O3‐C refractory material with a higher strength by using microporous corundum aggregates instead of dense tabular corundum aggregates, which was reinforced by in situ formed SiC whiskers, multi‐walled carbon nanotubes (MWCNTs), and mullite rods. A comparative study of the microstructure, mechanical properties, and fracture behavior was carried out for dense and lightweight Al2O3‐C refractories coked at 1200°C and 1400°C, respectively. By using the microporous corundum aggregates, a better aggregate/matrix interface bonding and an optimized distribution of SiC whiskers were obtained. The SiC whiskers formed inside the microporous corundum aggregates and simultaneously in the matrix by a vapor‐solid reaction mechanism, resulting in an enhancement at the microporous aggregate/matrix interface. Furthermore, the in situ formed MWCNTs and well‐developed mullite rods at 1200°C in the matrix also contributed to the better interface structure. Thus, due to the improved microporous aggregate/matrix interface, the crack propagation along the aggregate/matrix interface was suppressed, resulting in an increased crack propagation within the aggregates. Consequently, the synergy between microporous corundum aggregates and combined one‐dimensional ceramic phases caused a lower bulk density but a markedly higher strength, a higher fracture energy, and a higher toughness of lightweight Al2O3‐C refractories compared to the dense ones. Overall, our study allows to overcome the traditional concept that a higher strength of refractories is reached by a higher density.

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“…As linings for high‐temperature industrial furnaces, refractory materials are responsible for the high energy efficiency of these furnaces . In recent years, replacing traditional dense wear linings with lightweight linings has been considered a promising approach to improve the heat insulation of industrial furnaces.…”

Section: Introductionmentioning

confidence: 99%

“…As linings for high-temperature industrial furnaces, refractory materials are responsible for the high energy efficiency of these furnaces. 1,2 In recent years, replacing traditional dense wear linings with lightweight linings has been considered a promising approach to improve the heat insulation of industrial furnaces. However, because wear linings suffer from corrosion/penetration and from wear caused by high-temperature melts, the greatest concerns are related to the slag resistance and mechanical strength of lightweight materials.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of lightweight alumina with nanoscale intracrystalline pores

Huang

et al. 2019

J Am Ceram Soc

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In this study, lightweight alumina containing nanoscale intracrystalline pores was fabricated by introducing zirconia sol and alumina sol into α‐Al2O3 micropowder. The effects of zirconia sol on the sintering behavior of lightweight alumina were also investigated. With the introduction of zirconia sol, the grain growth and phase transformation of nano‐alumina are delayed. Therefore, the structure of the nanoscale pores between nanoparticles can be stabilized during heat treatment, and numerous nanoscale intracrystalline pores with diameters in the range of 50‐300 nm are trapped in the alumina grains. Because of the existence of these nanoscale intracrystalline pores, the thermal conductivity of lightweight alumina decreases significantly. Lightweight alumina with the addition of 0.75 wt% zirconia sol exhibits 31% lower thermal conductivity compared to alumina without zirconia sol.

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Preparation and application of ZrC-coated flake graphite for Al2O3-C refractories

Cited by 52 publications

References 36 publications

Low temperature synthesis via molten-salt method of r-BN nanoflakes, and their properties

Low temperature synthesis via molten-salt method of r-BN nanoflakes, and their properties

Enhanced mechanical properties of lightweight Al₂O₃‐C refractories reinforced by combined one‐dimensional ceramic phases

Fabrication of lightweight alumina with nanoscale intracrystalline pores

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Preparation and application of ZrC-coated flake graphite for Al2O3-C refractories

Cited by 52 publications

References 36 publications

Low temperature synthesis via molten-salt method of r-BN nanoflakes, and their properties

Low temperature synthesis via molten-salt method of r-BN nanoflakes, and their properties

Enhanced mechanical properties of lightweight Al2O3‐C refractories reinforced by combined one‐dimensional ceramic phases

Fabrication of lightweight alumina with nanoscale intracrystalline pores

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Product

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Enhanced mechanical properties of lightweight Al₂O₃‐C refractories reinforced by combined one‐dimensional ceramic phases