Preparation and properties of calcium hexaluminate blue ceramics
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Preparation and properties of calcium hexaluminate blue ceramics Guo Rui1,2 · Qingchun Wang1 · Jinxiao Bao1 · Xiwen Song2 · Jun Wang2 Received: 4 February 2020 / Accepted: 3 June 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
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 N i2+ and T i4+, 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%.
1 Introduction Calcium hexaluminate ( CaAl12O19) is a man-made hibonite with a high melting point, melting above 1830 °C [1]. It has good fracture toughness, thereby preventing the expansion of fracture, and has the advantages of chemical stability, high luminous efficiency, and relatively low cost [2, 3]. When this ceramic material is used in decorations, it can meet people’s needs, such as being a floor decoration [4], wall decoration, home decoration, or part of clothing and jewelry [5, 6]. Bright blue ceramics can soothe people’s mood, and people are very interested in them; thus, they have a high economic value and development value. The most commonly used mixed metal oxide (MMO) pigment in the industry is dissolved in the solid solution of the solvent component using doping elements [7]. Gravel-like
* Qingchun Wang [email protected] Guo Rui [email protected] 1
Institute of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, China
Key Laboratory of Advanced Ceramic Materials and Devices, Inner Mongolia Autonomous Region, Baotou 014010, Inner Mongolia, China
2
NiMoO4 nanoparticles decorated on carbon cloth (NMO @ CC) are used as electrochemical supercapacitors with excellent stability [8]. The most widely used blue ceramic pigments on the market mainly include vanadium-doped zircon (V-ZrSiO4), cobalt silicate (CoSiO4), and spinel cobalt blue [9] The blue ceramic pigments currently used generally require Co2+ in the crystal lattice to serve as the coloring effect. The content of C o2+ in the crystal lattice and the electronic stat
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