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Microstructure of Free MgO Powder | ||
| Journal of College of Education | ||
| Article 1, Volume 0, Issue 1, 2017, Pages 142-170 | ||
| Authors | ||
| Mahasin F. Hadi; Fadhil A. chyad; Etab F. Hussein | ||
| Abstract | ||
| The aim of this research is to study the Microstructure behavior of pure MgO free (uncompacted) powders and MgO added to magnesium chloride free powders with different doping rates (1% , 38% , 44% , and50%) . The sintering temperatures were taken from to in steps. The sintering times were taken 3 hr, 24 hr, and 48 hr. The essential contribution of this work consists of new results in microstructure development . First , increasing the concentration of magnesium chloride (50%) led to obtain single ultrafine grains at low temperatures . secondly , the formation of a new structure that is the fiber structure at sintering conditions (temperature and time) ; ,48hr for magnesium oxide added to 44% magnesium chloride powders . while reducing the ratio of the additive material ; magnesium chloride to (1%) led to decrease the sintering temperature and sintering time to and 3hr , respectively which is required to the fiber formation . An important structure is recognized at the intermediate stage of sintering, this is the Kelvin's tetrakaidecahedron. This occurred at sintering temperature , 24 hr sintering time for 44% magnesium chloride added with magnesium oxide powders. | ||
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