WANG Han, LI Cuiwei, WU Linghao, LI Hao
(School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China)
Abstract: Using α-Al2O3 as raw material and propyl gallate (PG) as surface modifier, the alumina porous ceramics were prepared by the particle-stabilized foam method. The effects of PG on foam stability of the slurry and material structure and properties were investigated. The study found: with the increasing of the added amount of PG, the fluidity of the slurry after ball milling gradually deteriorated, while the foam stability increased from 70.41% to 84.85%. There is some difference in the total porosity of the materials prepared with different parameters, ranging from 58.60% to 75.16%, and the compressive strength ranges from 15.98 MPa to 66.72 MPa. The experiments with three PG addition modes found that the ceramic slurry obtained by adding PG to the alumina suspension after dissolution was more uniform, foaming was easier, the total porosity was 66.53%, and the compressive strength was up to 55.23 MPa.
Key words: alumina porous ceramic; stirring foaming; particle stability; propyl gallate; wet foam stabilit