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Effect of Sintering Atmosphere on Microstructures and Properties of Synthesized Microporous MgO Refractory Raw Material

INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY(2023)

Wuhan Univ Sci & Technol

Cited 12|Views4
Abstract
Effects of sintering atmosphere on the microstructure and strength of magnesite were investigated using magnesite powder as raw material through X-ray diffraction, scanning electron microscopy, mercury porosimetry measurement, and so on. The results showed that the sintering atmosphere strongly affected the sintering behavior of magnesite. The specimens sintered in the reducing atmosphere had more and finer micro-sized pores inside the MgO particles compared with that in the oxidizing atmosphere at the same sintering temperature. Besides, MgO refractory raw material containing porous MgO microparticles with core-shell structure was obtained through the carbothermal reduction of MgO microparticles and subsequent oxidation of Mg vapor at the surface of MgO particles at 1500 degrees C in the reducing atmosphere. At the reducing atmosphere and 1500 degrees C, the microporous MgO refractory raw material with the core-shell structure of external dense and internal porous had an apparent porosity of 22.1% and a compressive strength of 51.6 MPa.
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Key words
core-shell structure,microporous MgO refractory raw material,microstructure,sintering atmosphere,strength
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