Central South University researchers, in collaboration with China Tobacco Hunan Industrial Co., Ltd., have published groundbreaking new research unveiling the significant effects of magnesium oxide (MgO)and calcium carbonate (CaCO₃) on the performance of porous alumina ceramics. The study, titled Effects of Magnesium Oxide and Calcium Carbonate Mineralizers on the Performance of Porous Alumina Ceramic, is featured in the August 2023 issue of Materials Science and Engineering of Powder Metallurgy.
Porous alumina ceramics are vital in many high-tech industries, including aerospace, casting, insulation, and advanced manufacturing, due to their high-temperature resistance, corrosion resistance, and mechanical strength. However, optimizing the performance and processing efficiency of these ceramics remains a key challenge in materials science.
The research team systematically explored how adding varying amounts of magnesium oxide and calcium carbonate as mineralizers during the sintering process influences key properties of porous alumina ceramics. Their experiments demonstrated that both MgO and CaCO₃ significantly reduce sintering shrinkage rate and density, while greatly increasing porosity and dissolving efficiency—critical factors in industrial ceramic core removal and material performance.
Specifically, the addition of magnesium oxide resulted in samples that could be completely dissolved in alkali solution within just 24 hours, outperforming both calcium carbonate and titanium dioxide–only samples. Calcium carbonate was shown to further enhance apparent porosity. The study also found that increasing the sintering holding time further improved the density and mechanical strength of the ceramics.
Professor Jing Ouyang, lead author of the study, emphasizes, “Our findings provide important insights for tuning the structure and performance of porous alumina ceramics. The use of magnesium oxide and calcium carbonate as mineralizers can directly address bottlenecks in manufacturing, such as improving dissolving efficiency and controlling shrinkage.”
This research not only advances academic understanding but also provides practical strategies for the efficient removal of ceramic cores and the development of high-performance, industrial-grade porous alumina ceramics. The study was supported by the National Natural Science Foundation of China and other funding bodies.
Reference:
CHEN Guang, WANG Wei, LIANG Lixing, PENG Yonghui, ZHOU Wentao, OUYANG Jing, WANG Zhiguo. Effects of magnesium oxide and calcium carbonate mineralizers on the performance of porous alumina ceramic [J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(4): 347-360. DOI: 10.19976/j.cnki.43-1448/TF.2023028
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