Preparation of MgTiO₃ ceramics by high energy ball milling

Abstract

MgTiO₃ precursor was mechanochemically synthesized by high-energy ball milling of MgO and TiO₂. The sintering characteristic of the resulted MgTiO₃ precursor was investigated. The experimental results indicate that particles of both MgO and TiO₂ powders become smaller rapidly, and then the crystalline structures of MgO and TiO₂ change significantly. MgTiO₃ was observed by XRD after 30 hours of ball milling. Strong diffraction peaks of MgTiO₃ were observed after 50 hours of ball milling. HRTEM observation proves that dense MgTiO₃ ceramics with a compact crystalline structure can be sintered from mechanochemically activated MgTiO₃ precursor, the volume density of the resulting ceramic is as high as 95% of the theoretical density, the porosity and average pore diameter of the ceramic are measured as 4.95% and 50 nm respectively, and the transverse strength exceeded 500 MPa.

Keywords

high energy ball milling / MgTiO₃ ceramics / sintering / feature

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