Effects of different additives on properties of magnesium aluminate Spinel–Periclase castable

Wang, Shaoyang; Zheng, Peng; Hou, Qingdong; Qi, Xin; Zhang, Ling; Li, Renjun; Chen, Lu; Luo, Xudong

doi:10.1016/j.ceramint.2022.09.328

Cited by 5 publications

(4 citation statements)

References 34 publications

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“…[8][9][10][11][12] Aiming to improving their service life, several attempts found that slag resistance and thermal shock resistance of the castables can be greatly improved by adding graphite. [13][14][15] Unfortunately, high water demand derived from nonwettability of graphite flakes, therefore the castables containing graphite flakes were limited in the application in steel ladle lining because of their higher porosity, lower strength, and poor oxidation resistance. 16,17 So far, the best choice to improve water-wettability of graphite was carbides coated on the surface of graphite using molten salt synthesis (MSS) method in comparison with micropellet technique, oxides sol-gel coating route.…”

Section: Introductionmentioning

confidence: 99%

Large‐scale fabrication of TiC@C powders and its effect on the properties of Al₂O₃‐MgO‐C castables

Zhao,

Yin,

et al. 2023

Int J Applied Ceramic Tech

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High performance carbon containing castables have always been pursued by researchers and steelmaking producers, unfortunately, poor water‐wettability of graphite flakes was greatly limited their application in castables. To respond this, we proposed a large‐scale and low‐cost modified molten salt shielding synthesis technique for fabricating TiC coated graphite in air atmosphere using graphite flake and Ti powder as raw materials. Microstructure, wettability and oxidation resistance of TiC@C powders, and effect of TiC@C powders on the properties of Al2O3‐MgO‐C castables were investigated. The results demonstrate that TiC coated graphite was synthesized via modified molten salt shielding synthesis route in air atmosphere. A uniform and continuous TiC layer was formed on the surface of graphite, thereby significantly improving the water‐wettability and oxidation resistance of graphite flakes. The castables with 5% TiC@C powders possessed lower apparent porosity, higher cold strength, good oxidation resistance, and slag resistance in comparison with the castables with graphite flakes, and slag resistance were also better than Al2O3‐MgO castables. The as‐fabricated TiC@C powders have good water‐wettability and oxidation resistance, making them as a prime carbon source for producing carbon containing castables for steel ladle linings.

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Section: Introductionmentioning

confidence: 99%

Large‐scale fabrication of TiC@C powders and its effect on the properties of Al₂O₃‐MgO‐C castables

Zhao,

Yin,

et al. 2023

Int J Applied Ceramic Tech

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“…To mitigate the heat loss, microporous aggregates were used to prepare the lightweight refractories for working linings, instead of dense aggregates. [8][9][10][11][12][13][14] The previous study indicated that lightweight magnesia-based refractories have higher strengths and lower thermal conductivity than dense refractories. 15 Mechanical properties and fracture behavior of lightweight magnesia-based refractories have been widely studied.…”

Section: Introductionmentioning

confidence: 99%

“…Conventional magnesia‐based refractories prepared by sintered or fused dense aggregates as raw materials, have high thermal conductivity and bulk density, leading to excessive heat loss through refractory lining. To mitigate the heat loss, microporous aggregates were used to prepare the lightweight refractories for working linings, instead of dense aggregates 8–14 . The previous study indicated that lightweight magnesia‐based refractories have higher strengths and lower thermal conductivity than dense refractories 15 …”

Section: Introductionmentioning

confidence: 99%

Evaluation of fracture behavior of lightweight magnesia‐based refractories via wedge splitting test along with acoustic emission detection

Yan

Dai

et al. 2023

Int J Applied Ceramic Tech

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The effect of spinel powder on the fracture behavior and mechanical properties of lightweight magnesia‐based refractories containing microporous magnesia aggregates with high apparent porosity (37.4%) were investigated by the wedge splitting test (WST) with the digital image correlation and acoustic emission. With the addition of spinel powder, lightweight magnesia spinel refractories showed a higher cold compressive strength compared with lightweight pure magnesia refractories. From the WST, the addition of spinel powder increased the specific fracture energy and characteristic length of lightweight magnesia spinel refractories, which improved the crack propagation resistance. The increased tortuosity of main crack and a higher ratio of crack propagation along the aggregates/matrix interface were main reasons for reducing the brittleness of lightweight magnesia spinel refractories. Besides, acoustic emission (AE) signal activity indicated that the propagation of pregenerated micro‐cracks by the thermal mismatch and the development of fracture progress zone were primary ways to consume energy in lightweight magnesia spinel refractories. The reduced proportion of crack propagation within aggregates was also detected by the peak frequency of AE signals in lightweight magnesia spinel refractories. For microporous magnesia aggregates with high apparent porosity (37.4%), lightweight magnesia spinel refractories also showed reduced brittleness fracture behavior than lightweight pure magnesia refractories.

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“…Recently, secondary refining processes, including higher temperature (>1650 • C), higher stirring intensity (>1 MPa) and longer stirring periods (>1 h), have been conducted in steel ladles, therefore making their service conditions more severe and shortening the service life of ladle linings [4][5][6][7][8]. Therefore, performances, including the slag resistance and TSR of the castable linings in steel ladles, need to be improved [6][7][8][9][10][11]. Several attempts have been made to incorporate graphite flakes in castables because of their good TSR and non-wettability by slag and liquid steel [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Large-Scale Fabrication of SiC-TiC@C Powders via Modified Molten Salt Shielding Synthesis Technique and Their Effect on the Properties of Al2O3-MgO Castables

Li,

Yin,

Chen

et al. 2023

Materials

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Graphite flakes are commonly used to fabricate carbon-based refractories owing to their superior properties, including better corrosion resistance and thermal shock resistance (TSR); unfortunately, their insufficient water-wettability has remarkably hindered their application in castables. Aiming to enhance their water-wettability, a facile and low-cost technique for fabricating carbides coated in graphite was proposed in this work. Firstly, SiC-TiC coated graphite (SiC-TiC@C) powders were prepared via modified molten salt shielding synthesis in an air atmosphere using graphite flake, Si and Ti powders as raw materials and NaCl-KCl as the molten salt shielding medium. Water-wettability and oxidation resistance of SiC-TiC@C powders were significantly improved. Compared to the Al2O3-MgO castables with graphite flakes, the water demand of the castables with SiC-TiC@C was noticeably decreased from 6.85% to 4.89%, thereby decreasing the apparent porosity of the castables with 5% SiC-TiC@C (from 20.3% to 13%), enhancing the cold strength, hot strength and oxidation resistance of the castables. Such enhancements are ascribed to continuous and crack-free SiC-TiC coatings on graphite surfaces ensuring that the castables have outstanding properties.

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Effects of different additives on properties of magnesium aluminate Spinel–Periclase castable

Cited by 5 publications

References 34 publications

Large‐scale fabrication of TiC@C powders and its effect on the properties of Al₂O₃‐MgO‐C castables

Large‐scale fabrication of TiC@C powders and its effect on the properties of Al₂O₃‐MgO‐C castables

Evaluation of fracture behavior of lightweight magnesia‐based refractories via wedge splitting test along with acoustic emission detection

Large-Scale Fabrication of SiC-TiC@C Powders via Modified Molten Salt Shielding Synthesis Technique and Their Effect on the Properties of Al2O3-MgO Castables

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Effects of different additives on properties of magnesium aluminate Spinel–Periclase castable

Cited by 5 publications

References 34 publications

Large‐scale fabrication of TiC@C powders and its effect on the properties of Al2O3‐MgO‐C castables

Large‐scale fabrication of TiC@C powders and its effect on the properties of Al2O3‐MgO‐C castables

Evaluation of fracture behavior of lightweight magnesia‐based refractories via wedge splitting test along with acoustic emission detection

Large-Scale Fabrication of SiC-TiC@C Powders via Modified Molten Salt Shielding Synthesis Technique and Their Effect on the Properties of Al2O3-MgO Castables

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Large‐scale fabrication of TiC@C powders and its effect on the properties of Al₂O₃‐MgO‐C castables

Large‐scale fabrication of TiC@C powders and its effect on the properties of Al₂O₃‐MgO‐C castables