Study of Microstructure and Properties of Corundum-Calcium Hexaluminate Composite Aggregate

Abstract:

Effect of adding CaCO₃ on the microstructure and properties of corundum was studied, with corundum modified by adding CaCO₃ powder, by means of XRD, SEM etc. The experimental results show that when the quantity of CaCO₃ powder is not more than 14.1wt%, would obtain corundum-calcium hexaluminate composite aggregate. When a little hexaluminate is generated, it would not increase porosity significantly but closed porosity increase slightly, and the heat conductivity is lower than tabular corundum. Calcium hexaluminate in aggregate grow well and are flakes. There are large numbers of small pores, and distributed uniformly. Composite aggregate has preferable performance of sintered and low thermal conductivity when hexaluminate generative capacity is about 27%.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 433-437
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.433
• Online since: May 2013
• Authors: Lv Ping Fu, Hua Zhi Gu, Bo Du, Ao Huang, Zheng Kun Li
• Keywords: Aggregate, Corundum-Calcium Hexaluminate, Low Thermal Conductivity, Microstructure

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