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Microstructure of Free MgO powrler | ||
| Journal of College of Education | ||
| Article 1, Volume 0, Issue 3, 2017, Pages 863-885 | ||
| Authors | ||
| Mahasin F. Hadi; Etab F. Hussein; Fadhil A. chyad | ||
| Abstract | ||
| The aim of this research is to study the Microstructure behavior of pure Mgo free (uncompacted) powders and Mgo added to magnesium chloride(MgCtr)free powders with different doping rates (lolo ,38Yo ,44yo, and50%) . The sintering temperatures were taken from700'c to 1600"c in 100'c steps. The sintering times were taken 3hr,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 stmctr_rre that is u the fiber structure at sintering conditions (temperature and time) ; 1100'c,48hr for magnesium oxide added to 44% magnesium chloride powders . while reducing the ratio of the additive material ; magnesium chloride to (-l%) led to decrease the sintering temperature and sintering time to l000"cand 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 temperaturelr00"c, 24 hr sintering time for 44% magnesium chloride added with magnesium oxide powders. | ||
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