Effect of nickel oxide and titanium oxide on the microstructural, optical, and mechanical properties of calcium hexaaluminate ceramics

Cui, Shichuang; Wang, Qingchun; Zhou, Yang; Mao, Dawei; Bao, Jinxiao; Song, Xiaoyan

doi:10.1016/j.ceramint.2021.09.073

Cited by 15 publications

(1 citation statement)

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“…The authors concluded that a lower sintering temperature results in higher grain growth, which can lead to a greater reduction in the number of closed pores, improving the mechanical properties. The platelet shape of CaAl12O19 grains inhibits the diffusion and sintering processes, promotes the formation of intergranular porosity, and, consequently, increases the open porosity of the material [27]. The investigations were conducted using X-ray phase analysis.…”

Section: Resultsmentioning

confidence: 99%

Features of calcium hexaaluminate formation in alumina-zirconia ceramics

Cherkasova,

Antropova,

Kuzmin

et al. 2023

Chim.Tech.Acta

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Alumina-zirconia composites containing calcium hexaaluminate in the amount from 0 to 15 wt.% were investigated. The materials were obtained by water dispersion, granulation, axial pressing, and free sintering. Density and open porosity were determined by the hydrostatic weighing method. Phase analysis was performed using synchrotron radiation. Structural investigations were conducted using scanning and transmission electron microscopy. Vickers hardness was determined at a load of 10 kg. Fracture toughness was determined by the indentation method. With increasing CaAl12O19 content in the composites, the relative density decreased from 98.5% to 91.8%, and the open porosity increased from 0.2 to 1.4%. The lattice parameters of t-ZrO2 crystal lattice did not change up to 12 wt.% CaAl12O19, and the degree of tetragonality was 1.435. The degree of tetragonality decreased for the material with 15 wt.% CaAl12O19 and reached 1.420. The lattice parameters of CaAl12O19 decreased with increasing content. Platelet size increased with increasing calcium hexaaluminate content. For the materials containing up to 9 wt.% CaAl12O19, the average length of the platelets was 2 μm, the width was 0.4 μm, and the aspect ratio was 5. For the material with maximum calcium hexaaluminate content, the average length of the platelets was 4.2 μm, the width was 0.6 μm, and the aspect ratio was 7. With increasing CaAl12O19 content, the hardness decreased from 1700±25 to 1390±30 Hv, and the critical stress intensity factor increased by 34% to 6.7±0.3 MPa·m1/2.

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Section: Resultsmentioning

confidence: 99%