Impact of high energy ball milling on densification behaviour of magnesium aluminate spinel evaluated by master sintering curve and constant rate of heating approach. Issue 17 (1st December 2019)

• Record Type: Journal Article
• Authors: Talimian, A.; Pouchly, V.; El-Maghraby, H.F.; Maca, K.; Galusek, D.
• Is Part Of: Ceramics international. Volume 45:Issue 17(2019)Part B
• Page Start: 23467
• Page End: 23474
• Publication Date: 2019-12-01
• Subjects: Magnesium aluminate spinel -- High energy milling -- Sintering -- Master sintering curve -- Constant rate of heating approach; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.08.051
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The present study investigates the influences of high energy ball-milling on densification of a commercial sub-micron magnesium aluminate spinel powder. High energy milling decreases the crystallite size and modifies the particle size distribution of powder resulting in better compaction of green bodies. Milling, also, increases the number of structural defects. The concept of master sintering curve (MSC) and the constant rate of heating (CRH) approach were employed to evaluate the activation energy of sintering. It was demonstrated that, according to MSC, the milled samples exhibit lower densification activation energy compared to the as-received powder (530 kJ mol −1 vs 750 kJ mol −1 ). Analysing the densification using CRH approach reveals that the sintering activation energy of milled samples remains constant during the sintering process, while that of as-received samples increases with densification. The estimated activation energy using MSC method is thus an average value of the values measured over the whole process of sintering.