Sintering and Performance of MgO from Bischofite with ZrO₂ Additive

Abstract:

Effect of ZrO₂ on sintering properties of MgO prepared from natural brine from Qarhan Salt Lake, crystalline bischofite and MgCl₂·6H₂O(AR) was studied. The results showed that ZrO₂ of addition exceeded 1 wt% had promotive effect on sintering of magnesia prepared from MgCl₂·6H₂O(AR). While 1.5 wt% ZrO₂ was added, the bulk density of sample was 3.37 g/cm³, and relative density was 94.1%. With 1 wt% ZrO₂, the bulk densities of magnesia prepared from crystalline bischofite and brine were 3.10 and 3.27 g/cm³, and the relative densities increased by 10.0% and 19.6%, respectively. The main reasons for promoting MgO sintering with ZrO₂ were that monoclinic phase ZrO₂ converted to cubic phase Zr₂O and excess ZrO₂ reacted with MgO to generate Mg_0.13Zr_0.87O_1.87, which activated lattice and promoted the diffusion of ions during sintering process. In addition, liquid phase sintering was also one of the main reasons for promoting the sintering of brine magnesia.

• Periodical: Applied Mechanics and Materials (Volume 455)
• Pages: 11-17
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.455.11
• Online since: November 2013
• Authors: Qiong Zhu Huang*, Gui Min Lu, Jian Guo Yu
• Keywords: Crystal Transition, MgO, Sintering, Zro₂

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