Advanced lightweight periclase-magnesium aluminate spinel refractories with high mechanical properties and high corrosion resistance

Peng, Wangding; Chen, Zhe; Yan, Wen; Schafföner, Stefan; Li, Guangqiang; Li, Yawei; Jia, Cangjian

doi:10.1016/j.conbuildmat.2021.123388

Cited by 46 publications

(14 citation statements)

References 42 publications

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“…While these composite materials show great promise of improved strength and stiffness in the fabrication of parts. A preferable combination of several important properties such as high melting point, good thermal shock resistance, high resistance to chemical attack, high electrical resistivity, low thermal expansion coefficient, and potentially high mechanical strength at different temperatures, have made magnesium aluminate (MgAl 2 O 4 ) very attractive for engineering applications (Stewart and Bradt, 1980;Baudin et al, 1995;Ganesh, 2013;Peng et al, 2021). Magnesium aluminate has drawn attention from the industries in the field of metallurgical, radio technical and electrochemical, chemical industries because of its excellent properties and environmental advantages (Peng et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Additive manufacturing of Al2O3 ceramics with MgO/SiC contents by laser powder bed fusion process

et al. 2023

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Laser powder bed fusion is a laser-based additive manufacturing technique that uses a high-energy laser beam to interact directly with powder feedstock. LPBF of oxide ceramics is highly desirable for aerospace, biomedical and high-tech industries. However, the LPBF of ceramics remains a challenging area to address. In this work, a new slurry-based approach for LPBF of ceramic was studied, which has some significant advantages compared to indirect selective laser sintering of ceramic powders. LPBF of Al2O3 was fabricated at different MgO loads up to 80 wt%. Several specimens on different laser powers (70 W–120 W) were printed. The addition of magnesia influenced the microstructure of the alumina ceramic significantly. The findings show that when the laser power is high and the magnesia load is low, the surface quality of the printing parts improves. It is feasible to produce slurry ceramic parts without binders through LPBF. Furthermore, the effects of SiC and MgO loads on the microstructure and surface morphology of alumina are compared and analysed.

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Section: Introductionmentioning

confidence: 99%

Additive manufacturing of Al2O3 ceramics with MgO/SiC contents by laser powder bed fusion process

et al. 2023

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“…It can be seen that the bulk densities of the specimens gradually increased, and the apparent porosities gradually decreased with the increase of the sintering temperature. The bulk densities of each group of the specimens sintered in the oxidizing atmosphere ranged from 1.49 to 2.97 g/cm 3 , and the apparent porosities ranged from 56.5% to 15.5%, whereas the bulk densities of that sintered in the reducing atmosphere ranged from 1.25 to 2.79 g/cm 3 , and the apparent porosities ranged from 64.7% to 19.4%. Compared with the oxidizing atmosphere, the bulk density of the specimen sintered at the same temperature, but the reducing atmosphere diminished and the apparent porosity enlarged.…”

Section: Physical Propertiesmentioning

confidence: 97%

“…Magnesia-based refractories have been widely used in high-temperature industrial furnaces, such as steel ladles, converters, and cement rotary kilns, because of their high refractoriness, excellent high-temperature strengths, and remarkable slag resistance. [1][2][3][4][5][6][7][8][9] Conventional magnesiabased refractories are prepared with MgO-based aggregates and magnesia powder as well as other powder. [10][11][12] Magnesia-based aggregates are mainly prepared with magnesite by electrical fusion 13 or sintering methods.…”

Section: Introductionmentioning

confidence: 99%

Effect of sintering atmosphere on microstructures and properties of synthesized microporous MgO refractory raw material

Liu

Yan

Chen

et al. 2023

Int J Applied Ceramic Tech

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Effects of sintering atmosphere on the microstructure and strength of magnesite were investigated using magnesite powder as raw material through X‐ray diffraction, scanning electron microscopy, mercury porosimetry measurement, and so on. The results showed that the sintering atmosphere strongly affected the sintering behavior of magnesite. The specimens sintered in the reducing atmosphere had more and finer micro‐sized pores inside the MgO particles compared with that in the oxidizing atmosphere at the same sintering temperature. Besides, MgO refractory raw material containing porous MgO microparticles with core–shell structure was obtained through the carbothermal reduction of MgO microparticles and subsequent oxidation of Mg vapor at the surface of MgO particles at 1500°C in the reducing atmosphere. At the reducing atmosphere and 1500°C, the microporous MgO refractory raw material with the core–shell structure of external dense and internal porous had an apparent porosity of 22.1% and a compressive strength of 51.6 MPa.

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“…The corrosion index I c and penetration index I p were respectively calculated with the following equations 43 :…”

Section: Slag Resistances Of the Samplesmentioning

confidence: 99%

Effect of hollow spheres on the properties of lightweight periclase‐magnesium aluminate spinel refractories

Liu

Zhang

Wang

et al. 2023

Int J Applied Ceramic Tech

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This study presents new lightweight periclase-magnesium alumina spinel refractories for the working lining of cement rotary kilns in which magnesium alumina spinel hollow spheres are used to replace conventional dense fused magnesiaaluminate spinel aggregates. The effects of adding spinel hollow spheres on the physical properties, mechanical strength, thermal conductivity, and slag resistance of the samples were explored. The results showed that compared with the sample prepared with dense aggregates, the sample prepared with hollow spheres had a 10.3% higher cold compressive strength, 44.1% higher modulus of rupture (MOR), and lower bulk density. Additionally, with increasing hollow spheres content, the thermal conductivity decreased from 3.79 W/(m⋅K) to 2.53 W/(m⋅K), and the high-temperature MOR increased from 2.82 to 4.09 MPa. The highest residual strength ratio was 90.73% (15 wt.% hollow spheres), which is 1.17 times that of the sample prepared without hollow spheres. Moreover, microstructure and energy dispersive spectroscopy of crucible specimens after corrosion by cement clinker showed that specimens with 15 wt.% hollow sphere additions had a better slag resistance. Introducing hollow spheres reduced the thermal conductivity of the refractories, providing a new strategy for improving the heat insulation performance of kiln linings.

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Advanced lightweight periclase-magnesium aluminate spinel refractories with high mechanical properties and high corrosion resistance

Cited by 46 publications

References 42 publications

Additive manufacturing of Al2O3 ceramics with MgO/SiC contents by laser powder bed fusion process

Additive manufacturing of Al2O3 ceramics with MgO/SiC contents by laser powder bed fusion process

Effect of sintering atmosphere on microstructures and properties of synthesized microporous MgO refractory raw material

Effect of hollow spheres on the properties of lightweight periclase‐magnesium aluminate spinel refractories

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