Synthesis of an innovative zirconia-mullite raw material sintered from andalusite and zircon precursors and an evaluation of its corrosion and thermal shock performance

Abstract

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Thermomechanical Characterisation of Mullite Zirconia Composites Sintered from Andalusite for High Temperature Applications

“…This may be due to the formation of cracks in the This decrease in porosity may be due to the amorphous phase generated during the decomposition of zircon. The formation of this vitreous phase can improve the densification by sintering in liquid phase [10,13,[19][20][21]. It is also likely that the zirconia particles fill the gaps in the microstructure of the material.…”

“…This decrease can be attributed to M3 having a greater proportion of amorphous phase (Table 2) in its structure, logically reducing the value of E. However, the Young's moduli of M2 and M3 are superior to that of M1 one, even after having been submitted to three thermal shocks (Table 3, Figure 9). It is likely that this is associated with the repetition of the martensitic transformation Q-M (quadratic in monoclinic) which could occur during thermal shocks between temperatures of 750 • C and 500 • C [10,13]. As these samples have a considerable amount of zirconia in their structure, they can more easily block the propagation of the diffuse microcracks network and, therefore, improve their thermal shock performances.…”

“…During the mullitisation process of andalusite, a rich silica (SiO 2 ) liquid phase is formed, which plays a very important role because it promotes atomic diffusion and allows mullitisation through a dissolution-precipitation mechanism [11]. Furthermore, during sintering, the alumina used in the elaboration of these refractories can react with the liquid phase forming secondary mullite phase [13].…”

Thermal decomposition and reaction sintering for synthesis of mullite-zirconia composite using kaolin, γ-alumina and zirconia

“…Mullite-ZrO 2 composite materials can be used in different industries, for example, in glass and steel industries due to their suitable physical, thermal, and mechanical properties, and, also, the excellent corrosion resistance against slags due to the high melting temperature of 2715 °C [2,3]. These composite materials possess high fracture toughness, fracture strength, and thermal shock resistance because the zirconia particles distributed homogeneously in the mullite matrix cause improvement of the properties mentioned [4][5][6][7][8].…”

Analysis and Prediction of Corrosion of Refractory Materials by Sodium Salts during Waste Liquid Incineration—Thermodynamic Study

“…With the advancement of society and the development of science and technology, the performance requirements of refractory materials are getting higher and higher. Many researchers have studied and improved the corrosion resistance of refractories [ 2 , 3 , 4 , 5 , 6 ], thermal shock resistance [ 7 , 8 , 9 ], and anti-wear properties [ 10 ]. M. Yoshikawa et al [ 11 ] studied the erosion resistance of MgO-based spinel and Al 2 O 3 -based spinel refractories and found that these two refractories can replace Al 2 O 3 -Cr 2 O 3 refractories with low chromium content and are more suitable for alkali furnaces.…”