微观结构
去壳
多孔性
材料科学
热导率
复合材料
电导率
陶瓷
体积分数
矿物学
化学
植物
物理化学
生物
作者
Kalyani Mohanta,Ajay Kumar,Om Parkash,Devendra Kumar
摘要
This study demonstrates a cost‐effective way to fabricate porous ceramics with tailored porosity and pore microstructure using 5–40 wt% rice husk (RH) in <75 μm, 75–180 μm, 180–355 μm, 355–420 μm, and 420–600 μm size, as pore former. Sucrose, used as binder, also acted as a pore former. Porous alumina compacts with 20%–66% volume fraction porosity and 50–516 μm pore size (length) were successfully fabricated. Microstructure of samples reveal randomly oriented elongated coarse pores and fine pores (avg. size 4 μm), created during burnout of RH and sucrose, respectively. Samples with isolated and/or interconnected pores were fabricated using this process. Thermal conductivity of the samples prepared was measured using Transient Plane Source (TPS) technique. Thermal conductivity ranges from 1.2 to 24 W/ mK . Experimental results agree closely with predictions made based on Effective Medium Theory (EMT) for a two‐phase system.
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