醇类添加剂对冷冻浇注陶瓷的多孔结构及形貌的影响（英文）

采用冷冻浇注法制备具有层状多孔结构的氧化铝陶瓷。通过添加乙醇和正丙醇两种类型的醇类来改变水的凝固点,研究醇类的添加量及浆料的固态含量对水基氧化铝浆料的黏度、多孔陶瓷的微观结构、孔隙率和力学性能的影响。结果表明:随着浆料中乙醇和正丙醇含量的增加,浆料的黏度增加,氧化铝陶瓷的孔隙度降低;醇类的加入会使片层之间具有较好的连接从而增加多孔氧化铝陶瓷的抗压强度;当乙醇或正丙醇的添加量为30%(质量分数)时,对应的孔隙度最低,分别为68.52%和73.72%,而抗压强度最高,分别为18.2 MPa和15.0 MPa。

Effects of alcohol additives on pore structure and morphology of freeze-cast ceramics

The porous alumina ceramics with lamellar structure were fabricated successfully by freeze casting. The viscosities of alumina slurries, pore structures, porosities and mechanical properties of the sintered ceramics were investigated by introducing both types of alcohols as water solidification modifier into the initial slurries, such as ethanol and 1-propanol. With the addition of ethanol or 1-propanol, the viscosities of slurries increased and porosities of sintered ceramics decreased. The compressive strengths of the sintered porous alumina ceramics were improved due to a good connectivity between lamellae with the addition of both types of alcohols. The lowest porosities of 68.52% and 73.72% and highest compressive strengths of 18.2 MPa and 15.0 MPa were obtained by the addition of 30% ethanol in mass fraction and 1-propanol, respectively.