Surface hydrate-assisted low- and medium-temperature sintering of MgO. (1st January 2022)

• Record Type: Journal Article
• Authors: Guo, Ning; Liu, Ming; Shen, Jie-Yu; Shen, Hui-Zhen; Shen, Ping
• Is Part Of: Scripta materialia. Number 206(2022)
• Publication Date: 2022-01-01
• Subjects: MgO -- Mg(OH)2 -- Cold sintering -- Densification; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114258
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: MgO was readily densified by cold sintering at 180 °C with the help of its surface hydrate, but the product contained a considerable amount of Mg(OH)2 . By increasing the sintering temperature to 450 °C to remove Mg(OH)2, pure MgO with a relative density of 93% was achieved. The effects of processing parameters such as Mg(OH)2 amount, initial liquid phase content, uniaxial pressure and dwelling time on densification behavior were investigated. Densification was achieved through a series of processes, including hydration of MgO, decomposition of Mg(OH)2, particle rearrangement, grain boundary diffusion and recrystallization of newly formed MgO. This work provides a novel approach to solve the challenge of densification in most oxides by means of a cold sintering process. Graphical abstract: Image, graphical abstract