The aim of the present work is to study the effect of different milling speeds on the preparation of akermanite ceramics. In this study, akermanite (Ca2MgSi2O7) was synthesized by high speed planetary ball milling and mixing method. Calcium oxide (CaO), magnesium oxide (MgO) and silicon dioxide (SiO2) were used as initial reactants. The starting materials were milled with molar ratio of 2:1:2, respectively, using ball-to-powder ratio 10:1 at different milling speeds of 300 rpm, 400 rpm and 500 rpm. After synthesis, the powders were pelletized to form pellets (13 mm) with 150 MPa by uniaxial pressing. The pellets were then sintered at 1250°C for 3h. Phase analysis by X-ray diffraction (XRD), surface morphology by Field Emission Scanning Electron Microscopy (FESEM), Brunauer-Emmet-Teller (BET) specific surface area analysis, linear shrinkage, porosity and density measurement were performed on the milled and sintered samples. It was found that milling at 500 rpm resulted in powder with largest surface area (108 m2/g), indicating the finest size of powder. FESEM observations showed that the sintered-akermanite ceramics from 500 rpm milling at 1250°C were the densest with microcrystalline appearance and clear grain boundaries, while milling at 300 rpm and 400 rpm showed some pores in the sintered samples.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2018 Oct 10|
|Event||Regional Conference on Materials and ASEAN Microscopy Conference 2017, RCM and AMC 2017 - Penang, Malaysia|
Duration: 2017 Dec 12 → 2017 Dec 13
ASJC Scopus subject areas
- Physics and Astronomy(all)