Journal
CERAMICS INTERNATIONAL
Volume 46, Issue 10, Pages 16956-16965Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.03.279
Keywords
Microporous magnesia aggregates; Lightweight refractories; CaZrO3; Slag resistance; Closed intragranular pores
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Funding
- National Natural Science Foundation of China [U1860205, U1908227, 51802231]
- China Postdoctoral Science Foundation [2018T110811]
- Special Project of Central Government for Local Science and Technology Development of Hubei Province [2019ZYYD076]
- WUST National Defence Pre-research Foundation [GF201804]
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Lightweight microporous magnesia aggregates with closed porosity of 6.2%, apparent porosity of 2.1% and median pore size of 2.36 mu m were fabricated by introducing nano-sized ZrO2 combined with magnesite decomposition and sintered at 1780 degrees C. The sintering properties and microstructure revealed that nano-sized ZrO2 promoted the sintering and formation of closed intragranular pores by increasing abundant crystal defects and producing cation vacancies (V'(Mg)) raising the migration rate of grain boundaries, which induced a change in porosity type from large open pores to small closed pores. The nano-sized ZrO2 changed the bonding of magnesia grains from single CaO-SiO2-MgO phases bonding to composited CaO-SiO2-MgO phases-CaZrO3 phases bonding, significantly enhancing the slag penetration resistance. The closed porosity played a more important role in reducing the thermal conductivity compared with total porosities. The microporous magnesia aggregates and thermal conductivity of 8.994 W (m K)(-1) at 800 degrees C exhibit potential for application in wear lining refractories.
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