Effect of microporous corundum aggregates on microstructure and mechanical properties of lightweight corundum refractories

Chen, Zhe; Yan, Weiping; Dai, Yajie; Schafföner, Stefan; Han, Bingqiang; Li, Nan

doi:10.1016/j.ceramint.2019.01.168

Cited by 55 publications

(39 citation statements)

References 30 publications

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“…Numerous studies have been conducted on the fabrication and properties of lightweight materials. Using in situ decomposition techniques, lightweight periclase‐spinel, corundum and mullite aggregates were fabricated by Yan et al The lightweight aggregates possessed a median pore diameter in the range of 3‐7 μm. However, the apparent porosities were typically above 20%.…”

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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Section: Introductionmentioning

confidence: 99%

Fabrication of lightweight alumina with nanoscale intracrystalline pores

Huang

et al. 2019

J Am Ceram Soc

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“…[5][6][7][8][9] Some methods have been put to fabricate porous aggregates such as introducing organic pore-forming agent, [10][11][12] in-situ decomposition pore-forming technique, [13][14][15][16] foaming method, 17,18 foam-gelcasting method, 19,20 and so on. [5][6][7][8][9] Some methods have been put to fabricate porous aggregates such as introducing organic pore-forming agent, [10][11][12] in-situ decomposition pore-forming technique, [13][14][15][16] foaming method, 17,18 foam-gelcasting method, 19,20 and so on.…”

Section: Introductionmentioning

confidence: 99%

“…In general, lightweight refractories are fabricated by introducing lightweight aggregates. [5][6][7][8][9] Some methods have been put to fabricate porous aggregates such as introducing organic pore-forming agent, [10][11][12] in-situ decomposition pore-forming technique, [13][14][15][16] foaming method, 17,18 foam-gelcasting method, 19,20 and so on. However, the porous aggregates fabricated by the aforementioned methods all share common problem of high apparent porosity.…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon sources on the properties of lightweight corundum‐spinel refractory with density gradient

Wan

Yin

Tang

et al. 2019

Int J Applied Ceramic Tech

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Lightweight refractories are expected to have excellent performance in high and room temperature in addition to energy consumption reduction. Lightweight corundum-spinel refractory was fabricated by carbothermal reduction of MgO, the oxygen diffusion rate controlled oxidation of Mg vapor, and subsequent reaction between MgO and Al 2 O 3 . The lightweight corundum-spinel refractory was characterized by X-ray diffraction and scanning electron microscopy. Effects of flaky graphite particle size and carbon black content on the properties of lightweight corundum-spinel refractory were investigated. The results showed that flaky graphite particle size had great effect on the stacking density of green compacts and the properties of refractory. When flaky graphite particle size was 42.44 µm, the refractory possessed bulk density 2.68 g/cm 3 , compressive strength (CS) 63.5 MPa, and refractoriness under load 1641°C fired at 1550°C for 4 hours. With the decrease of carbon black content, the properties of refractory increased, but the CS was low due to the generation of structure defects including large pores and cracks when compared with the samples using graphite as carbon source. In order to obtain lightweight refractory with good performance, the carbon particle size and content should be chosen properly in addition to firing temperature and holding time. K E Y W O R D Scarbon black, corundum-spinel, flaky graphite, lightweight refractory, particle size How to cite this article: Wan Q, Yin H, Tang Y, et al. Effect of carbon sources on the properties of lightweight corundum-spinel refractory with density gradient. Int J Appl Ceram Technol. 2020;17:598-605.

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“…Room temperature or high temperature monotonic mechanical tests were often performed to observe the mechanical behavior of the refractory materials for evaluating their performance in service conditions, eg thermal shock resistance and irreversible deformation. [3][4][5][6][7] For example, characteristic length defined by Hillerborg, 8 which can be calculated from the fracture parameters obtained from monotonic test (ie fracture energy, tensile strength), is used to characterize brittleness as well as thermal shock resistance of refractories. In addition, air/water quenching thermal shock test and mechanical cyclic test were also developed to simulate the failure of refractory under periodic stresses.…”

Section: Introductionmentioning

confidence: 99%

“…Refractories must possess adequate mechanical properties to sustain complex and severe stresses. Room temperature or high temperature monotonic mechanical tests were often performed to observe the mechanical behavior of the refractory materials for evaluating their performance in service conditions, eg thermal shock resistance and irreversible deformation . For example, characteristic length defined by Hillerborg, which can be calculated from the fracture parameters obtained from monotonic test (ie fracture energy, tensile strength), is used to characterize brittleness as well as thermal shock resistance of refractories.…”

Section: Introductionmentioning

confidence: 99%

Fracture behavior of magnesia refractory materials under combined cyclic thermal shock and mechanical loading conditions

Dai

Jin

et al. 2019

J Am Ceram Soc

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To investigate the effect of cyclic thermal shock and mechanical loading on the fracture behavior of magnesia refractories showing different brittleness, the as‐received and cyclic thermally shocked specimens are subjected to monotonic and cyclic wedge splitting test. The whole duration of test is monitored by digital image correlation and acoustic emission. Both thermal and mechanical fatigue resistance increase with the reduction of brittleness. Repetitive thermal shock results in pronounced reduction of strength. However, the specific fracture energy and nonlinearity increase after exposure to thermal shock due to the expanded micro‐crack network inducing the development of a significant fracture process zone. Periodic loading mainly leads to the decrease of strain bearing capacity, as the fatigue loads favor the extension of crack tip instead of fracture process zone expansion. The combined application of periodic thermal shock and mechanical loads gives a new insight into the progressive damage behavior of refractory under critical conditions.

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Effect of microporous corundum aggregates on microstructure and mechanical properties of lightweight corundum refractories

Cited by 55 publications

References 30 publications

Fabrication of lightweight alumina with nanoscale intracrystalline pores

Fabrication of lightweight alumina with nanoscale intracrystalline pores

Effect of carbon sources on the properties of lightweight corundum‐spinel refractory with density gradient

Fracture behavior of magnesia refractory materials under combined cyclic thermal shock and mechanical loading conditions

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