The properties characterization and strengthening-toughening mechanism of Al2O3-CA6-MA-Ni multi-phase composites prepared by adding calcined dolomite

Zhang, Xi; Liang, Jinsheng; Li, Junguo; Zeng, Yanan; Hao, Shuai; Liu, Pengyao; Hao, Na

doi:10.1016/j.matchar.2022.111810

Cited by 9 publications

(5 citation statements)

References 43 publications

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“…The phases, including alumina, spinel, and CA 6 , labeled in Figure 5 e,f were identified by EDS point analyses (the spectra are shown in Figure S1 and Figure S2 in Supplementary Materials ). Formed CA 6 as a binding phase tightly connected to alumina and spinel as seen in Figure 5 e. A structure of Al 2 O 3 -CA 6 -MA (spinel) with closely combined layers could eliminate pores, relax stress, and improve the mechanical properties of materials [ 40 ]. Well-grown CA 6 platelets were staggered and stacked together, as shown in Figure 5 f. Because of the crack-deflection and crack-bridging effects derived from CA 6 platelets, the fracture toughness of this three-layer structure was greater than in the MA–alumina coupling region [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

Enhanced Properties of Tailored Alumina–Magnesia-Based Dry Ramming Mixes by Calcium Magnesium Aluminate (CMA)

Tang

Jia

et al. 2023

Materials

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To achieve the goal of “dual-carbon”, induction furnaces with high efficiency and energy-saving advantages are paid more attention in the foundry and metallurgy industries. The service life and safety of induction furnaces strongly depended on the lining because expansion and forward sintering could result in the erosion and slag resistance of the lining. Focusing on the tailoring properties of alumina–magnesia-based dry ramming mixes, calcined magnesia particles were replaced with the novel multi-component materials of calcium magnesium aluminate (CaO-MgO-Al2O3, CMA) with a size of 200 mesh. Properties such as the bulk density, apparent porosity, strength, and slag corrosion resistance of alumina–magnesia-based dry ramming mix containing CMA were evaluated contrastively. The results demonstrate that the penetration index of manganese-bearing slag in dry ramming mixes first decreased and then slightly increased with the addition of CMA. Meanwhile, the permanent linear change in dry ramming mixes was gradually reduced. When the addition of CMA reached 4 wt%, the strength of the dry ramming mixes was slightly greater than the reference, and the slag penetration index was just 75% of the latter.

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Section: Resultsmentioning

confidence: 99%

Enhanced Properties of Tailored Alumina–Magnesia-Based Dry Ramming Mixes by Calcium Magnesium Aluminate (CMA)

Tang

Jia

et al. 2023

Materials

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“…The small number of inter-atomic bonds and the large distances between spinel blocks explains the low cohesive strength of the analyzed phase[31]. Zhang et al[32] also reported CaAl 12 O 19 platelet fractures and bridge formation. Shi et al[33] investigated alumina ceramics with SmAlO 3 platelets and similar toughening mechanisms were observed.…”

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confidence: 92%

Alumina-based ceramics reinforced with calcium hexaaluminate

et al. 2022

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In this study, alumina ceramics containing calcium hexaaluminate are investigated. The specimens are obtained by axial pressing of granulated powders and pressureless sintering. Fracture toughness is tested using the indentation method. Microhardness is determined by the Vickers method. XRD and microstructural studies using a scanning electron microscope are carried out. It was found that the use of Ca(OH) 2 leads to the formation of CaAl 12 O 19 in sintered alumina ceramics. As the platelet content increases, the average length of the platelets increases from 2 to 3 µm. The width of the platelets is about 0.4 µm. Increasing the CaAl 12 O 19 content decreases the size of Al 2 O 3 grains. The average grain size of the alumina ceramics is 1.65 ± 0.02 µm. For the material containing 6 wt.% CaAl 12 O 19 the average grain size is 0.95 ± 0.05 μm. An increase in the critical stress intensity factor for the formation of 6 wt.% CaAl 12 O 19 in a material compared to alumina ceramics without additives has been established. The relative density of such a material is 95.3 ± 0.5 %, microhardness is 1800 ± 50 HV, fracture toughness is 5.2 ± 0.4 MPa • m 1 / 2 . The increase in fracture toughness of composites containing CaAl 12 O 19 platelets is due to the fracture of platelets, crack bridging and crack deflection.

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“…Besides, research often focuses on carbonation materials that predominantly produce CaCO 3 or MgCO 3 , frequently overlooking the Ca–Mg 1:1 phase known as dolomite. , Dolomite stands out for its superior physical properties, such as higher elasticity modulus and hardness, compared to CaCO 3 or MgCO 3 alone. − It is important to note that Ca and Mg naturally coexist in many carbonate materials. Despite this, the underlying principles and formation mechanisms of minerals like dolomite are not fully understood.…”

Section: Introductionmentioning

confidence: 99%

Novel Carbonated Materials: The Synergistic Role of MgO in Partially Calcined Limestone

Zhou,

Qian,

Qin

et al. 2024

ACS Sustainable Chem. Eng.

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The rise of modern Portland cement has relegated lime to a secondary role in the construction industry, now mainly used for repairing and restoring historical buildings. This study proposes an innovative application of partially calcined limestone (PCL) as a carbonated material. The impact of varying MgO dosages on the carbonation mechanism of PCL is explored. It is found that a 5% MgO dosage significantly enhances the 1 d compressive strength postcarbonation by over 84.7%. The critical role of hydrated MgCO 3 , produced from MgO, in the formation and crystallinity of CaCO 3 is highlighted. However, it is observed that excessive MgO can impede carbonation, negatively impacting the mechanical properties and pore structure of the material. The presence of MgCO 3 •3H 2 O is noted to significantly influence the compressive strength of the carbonated material. Potential pathways for dolomite formation in PCL with different MgO dosages are suggested, indicating new possibilities for creating high-performance, low-carbon cementitious materials.

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The properties characterization and strengthening-toughening mechanism of Al2O3-CA6-MA-Ni multi-phase composites prepared by adding calcined dolomite

Cited by 9 publications

References 43 publications

Enhanced Properties of Tailored Alumina–Magnesia-Based Dry Ramming Mixes by Calcium Magnesium Aluminate (CMA)

Enhanced Properties of Tailored Alumina–Magnesia-Based Dry Ramming Mixes by Calcium Magnesium Aluminate (CMA)

Alumina-based ceramics reinforced with calcium hexaaluminate

Novel Carbonated Materials: The Synergistic Role of MgO in Partially Calcined Limestone

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