Pore structure and mechanical properties in freeze cast porous Si3N4 composites using polyacrylamide as an addition agent
Pore structure and mechanical properties in freeze cast porous Si3N4 composites using polyacrylamide as an addition agent
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以聚丙烯酰胺为添加剂的冷冻铸造多孔 Si3N4 复合材料的孔结构和力学性能
DOI：
10.1016/j.jallcom.2010.07.020
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发表时间：
2010-09
影响因子：
6.2
通讯作者：
Ye, Feng
中科院分区：
文献类型：
--
作者：
Zhang, Haijiao;Liu, Limeng;Zhang, Jingyi;Ye, Feng
以液氮为制冷剂，采用冷冻铸造法制备了多孔硅铝酸钡（BAS）/Si 3 N4复合材料。聚丙烯酰胺（PAM）的加入对多孔陶瓷的孔形貌、α→β-Si 3 N4相变和力学性能有显著影响。加入2 wt.% PAM的加入使冰晶结构由枝晶状的片层结构转变为无特征的柱状结构，其特征被烧结陶瓷中的气孔所复制。枝晶片层气孔有利于α→β-Si 3 N4相变，但不利于力学性能的提高。含1 wt.%的样品PAM的孔结构为柱状孔，树枝状孔较少，β-Si 3 N4颗粒长径比较大，使其具有最高的强度和韧性。加入PAM后，试样底部形成了一个相对致密的层，其厚度随PAM含量的增加而增加。
Porous barium aluminosilicate (BAS)/Si3N4composites were prepared by freeze casting process using liquid N2as refrigerant. The pore morphologies, α→β-Si3N4phase transformation, and mechanical properties of the resultant porous ceramics were strongly affected by the addition of polyacrylamide (PAM) into the slurries. The incorporation of 2wt.%PAM changed the ice crystals structure from lamellar with dendrites into featureless columnar ones, the feature of which was duplicated by the pores in the sintered ceramics. The lamellar pores with dendrites could favor the α→β-Si3N4phase transformation, but were detrimental to the mechanical properties. The sample with 1wt.%PAM exhibited the highest strength and toughness in the resultant porous composites due to its columnar pore structure with less dendritic pores and higher aspect ratio of β-Si3N4grains. A relative dense layer was formed at the bottom of the samples with PAM and its thickness increased with increasing PAM content.
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