Improved hydration resistance of CaO granules via sol‐processed metal oxide protective layers

Abstract

Well‐sintered CaO granules with hydration resistance are very important for the manufacturing and application of CaO‐containing refractories. CaO granules with sol‐processed metal oxide protective layers were prepared by granulation and surface treatment. The obtained results indicated that the usage of nano sol greatly improved the hydration resistance of CaO granules, especially when the CaO granules were treated by alumina sol. The promoting effect of nano sols in the sintering processes improved the density of CaO granules. Nanoparticles reacted with lime at lower temperature and a new phase was formed uniformly in the treated layer, which promoted densification of the treated layer. The grain size of CaO granules in the treated layer was increased obviously with the promotion of sintering. Moreover, nanoparticles were favorable for the formation of direct bonding between CaO grains by decreasing the dihedral angle.

Fabrication of CaAl12O19–CaTiO3 composites and their potential usage for TiAl alloy smelting

“…Owing to their low specific gravity, high specific strength, large hydrogen storage capacity, low damping, good biocompatibility, and shape memory, titanium alloys have been widely employed in energy storage, sensing, aerospace, and healthcare industries. [1][2][3][4][5] Among the various titanium alloys, TiAl alloys possess low density and high specific strength, specific stiffness, and resistance to high-temperature creep and oxidation. They are the preferred materials for ultra-high-speed aircraft and the next generation of advanced aircraft engines.…”

“…or advanced functional materials (phase change heat storage material, catalysts, energy storages materials, sensors, absorbing materials, etc.). Owing to their low specific gravity, high specific strength, large hydrogen storage capacity, low damping, good biocompatibility, and shape memory, titanium alloys have been widely employed in energy storage, sensing, aerospace, and healthcare industries 1–5 . Among the various titanium alloys, TiAl alloys possess low density and high specific strength, specific stiffness, and resistance to high‐temperature creep and oxidation.…”

Computational Discovery of the Qualitative Electronegativity–Wettability Relationship in High-Temperature Ceramics-Supported TiAl Alloys

“…Among typical HTCs (BaZrO 3 , Y 2 O 3 , ZrO 2 , Al 2 O 3 , CaO, and MgO), CaO tends to absorb water in practice and MgO tends to be unstable during the casting process of TiAl alloys. − Moreover, the absence of appropriate force fields for the two HTCs limits the simulation of contact angles between CaO, MgO, and TiAl alloys. Herein, BaZrO 3 , Y 2 O 3 , ZrO 2 , and Al 2 O 3 were chosen for simulating the contact angles with TiAl alloys in this work.…”