烧结
材料科学
微观结构
抗压强度
多孔性
晶粒生长
粒度
兴奋剂
复合材料
相对密度
冶金
光电子学
作者
S. W. Kim,Jongwon Woo,S.I. Hong,Jong‐Won Kim,Kyoung‐Seok Moon,Sang‐Chae Jeon,Sang‐Chae Jeon
摘要
Abstract Sintering phenomena, densification, and grain growth are crucial for proper control of the microstructure for good mechanical strength. Here, materials and processing parameters, the addition of La 2 O 3 , and two‐step sintering (TSS) were combined to lead to higher strength in the porous alumina prepared by freeze‐casting. Based on grain growth and densification behaviors with the La 2 O 3 doping, a beneficial thermal profile was designed for the TSS. As a result, higher relative density levels and smaller grain size were obtained compared with the results with conventional sintering (CS): 38.56% and 0.82 µm at 1500°C by CS; 40.78% and 1.78 µm at 1600°C by CS; 41.43% and 0.87 µm by TSS. The microstructural benefits provided ∼1.4 times higher compressive strength (5.46 MPa) from TSS than from the CS sample (3.92 MPa), highlighting the synergetic effect of La 2 O 3 doping and the TSS strategy.
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