Preparation and properties of calcium hexaluminate blue ceramics

Abstract

The doping of nickel and titanium is evaluated with the goal of coloring calcium hexaluminate ceramic (CaAl12−2xNixTixO19) and improving mechanical properties. The samples prepared by solid-phase reaction are studied with X-ray diffraction, UV–Vis diffuse reflection, a Konica Minolta colorimeter, scanning electron microscopy, and an indentation test of hardness. The increase in dopant content increases the fracture toughness of CaAl12O19, enabling us to obtain a pure blue ceramic material with a doping amount of x = 0.8. With the increase of Ni2+ and Ti4+, the color of the sample changes. Among the samples, the most vivid blue hue is obtained for an x value of 0.8 with a reflection peak at 473 nm in the UV spectrum and a blueness value (− b*) of 49.2 in the CIE L*a*b* system, which is bluer than cobalt-doped ceramics. The emission spectra of CaAl12O19 in the visible region confirmed that Ni2+ replaces Al3+ in the tetrahedron and causes an electron transition. The results also indicate that the incorporation of Ni2+ and Ti4+ increases the hardness of the sample and the fracture toughness, with the hardness of pure calcium aluminate increased by 22.1%.

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Funding

National Natural Science Foundation of China (51762036); Inner Mongolia Natural Science Foundation (2017BS0504, 2017MS0221); Inner Mongolia Autonomous Region Higher Education School “Youth Technology Talent Support Program” Category A (NJYT-19-A20).

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Correspondence to Qingchun Wang.

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Rui, G., Wang, Q., Bao, J. et al. Preparation and properties of calcium hexaluminate blue ceramics. J Mater Sci: Mater Electron 31, 11748–11757 (2020). https://doi.org/10.1007/s10854-020-03726-8

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