Synthesis of sphene by TiO2 combined with CaCO3 and SiO2 in solid phase and its application as ceramic opacifier

Li, Yangzi; Zhang, Tong; Ding, Hao; Sun, Sijia; Ao, Weihua; Zhang, Jianmeng; Zhang, Han

doi:10.1016/j.chemphys.2023.112076

Cited by 1 publication

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“…These free TiO 2 particles are easily transformed into a rutile phase and cause the yellowing of the glaze, which has a negative effect on the appearance of ceramic products and is the main reason limiting the application of TiO 2 as an opacifier. Using the solid-phase method, Li et al [ 15 ] used anatase, calcium carbonate, and white carbon to prepare synthetic titanite powder. Preparing TiO 2 in advance as a stable compound effectively inhibited the formation of rutile.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Application of Apatite–TiO2 Composite Opacifier: Preventing Titanium Glaze Yellowing through Pre-Combination

Bai,

Zhang,

et al. 2024

Materials

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In order to enhance the degree of binding reaction of TiO2 in titanium-containing ceramic glazes and prevent the reaction of its transformation into rutile to eliminate the yellowing phenomenon of the glaze surface, an apatite–TiO2 composite opacifier (ATO) was prepared through the mechanical grinding of hydroxyapatite and anatase TiO2. The properties, opacification mechanism, and yellowing inhibition of the prepared ceramic glazes were studied. The results show that the ATO is characterized by a uniform coating of TiO2 on the surface of the apatite and the formation of close chemical bonding between the apatite and TiO2. The ceramic glaze surface when using an ATO has a white appearance and excellent opacification performance. When an ATO was used, the L*, a*, and b* values of the glaze were 89.99, −0.85, and 3.37, respectively, which were comparable to those of a ZrSiO4 glaze (L*, a*, and b* were 88.24, −0.02, and 2.29, respectively). The opacification of the glaze was slightly lower than that of the TiO2 glaze (L* value was 92.13), but the appearance changed from yellow to the white of the TiO2 glaze (b* value was 9.18). The ceramic glaze layer when using an ATO mainly consists of titanite, glass phase, and a small amount of quartz, and the opacification mechanism is the crystallization of the generated titanite. ATOs can play an active role in solving the critical problem that arises when TiO2 replaces ZrSiO4 as an opacifier.

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Section: Introductionmentioning

confidence: 99%