Effect of MnO2 on Properties of SiC-mullite Composite Ceramics for Solar Sensible Thermal Storage
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2016年第3期
论文作者：徐晓虹 LAO Xinbin WU Jianfeng ZHANG Yaxiang XU Xiaoyang LI Kun
文章页码：491 - 495
摘 要：For improving the properties of Si C-mullite composite ceramics used for solar sensible thermal storage, Mn O2 was introduced as sintering additive when preparing. The composite ceramics were synthesized by using Si C, andalusite, α-Al2O3 as the starting materials with non-contact graphite-buried sintering method. Phase composition and microstructure of the composites were investigated by XRD and SEM, and the effect of Mn O2 on the properties of Si C composites was studied. Results indicated that samples SM1 with 0.2 wt% Mn O2 addition achieved the optimum properties: bending strength of 70.96 MPa, heat capacity of 1.02 J·（g·K）-1, thermal conductivity of 9.05 W·（m·K）-1. Proper addition of Mn O2 was found to weaken the volume effect of the composites and improve the thermal shock resistance with an increased rate of 27.84% for bending strength after 30 cycles of thermal shock（air cooling from 1 100 ℃ to RT）.
徐晓虹，LAO Xinbin，WU Jianfeng，ZHANG Yaxiang，XU Xiaoyang，LI Kun
School of Material Science and Engineering, Wuhan University of Technology
摘 要：For improving the properties of Si C-mullite composite ceramics used for solar sensible thermal storage, Mn O2 was introduced as sintering additive when preparing. The composite ceramics were synthesized by using Si C, andalusite, α-Al2O3 as the starting materials with non-contact graphite-buried sintering method. Phase composition and microstructure of the composites were investigated by XRD and SEM, and the effect of Mn O2 on the properties of Si C composites was studied. Results indicated that samples SM1 with 0.2 wt% Mn O2 addition achieved the optimum properties: bending strength of 70.96 MPa, heat capacity of 1.02 J·（g·K）-1, thermal conductivity of 9.05 W·（m·K）-1. Proper addition of Mn O2 was found to weaken the volume effect of the composites and improve the thermal shock resistance with an increased rate of 27.84% for bending strength after 30 cycles of thermal shock（air cooling from 1 100 ℃ to RT）.
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