Characterization of calcined kaolin/TiO₂ composite particle material prepared by mechano-chemical method

Abstract

Calcined kaolin/TiO₂ composite particle material (CK/TCPM) was prepared with TiO₂ coating on the surfaces of calcined kaolin particles by the mechano-chemical method. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to investigate the microstructures and morphologies, respectively. The mechanism of the mechano-chemical reaction between calcined kaolin and TiO₂ was studied by infrared spectra (IR). The results show that TiO₂ coats evenly on the surfaces of calcined kaolin particles by Si-O-Ti and Al-O-Ti bonds on their interfaces. The hiding power and whiteness of CK/TCPM are 17.12 g/m² and 95.7%, respectively, presenting its similarity to TiO₂ in pigment properties.

Keywords

mechano-chemical method / calcined kaolin / TiO₂ / composite particles material / pigment properties

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