Study on the preparation conditions of 0.1–0.8 mm Yttria stabilized ZrO₂–Al₂O₃ composite beads based on the sol–gel titration technology

抄録

In this work, based on the sol–gel titration technology, the method to prepare the composite beads with different diameters which range from 0.1 to 0.8 mm is researched. The detail studies on the preparation conditions which include the sol viscosity, sol specific gravity and size of discharge needle are proposed. The relationships between the preparation conditions and the final diameter of the prepared composite beads are obtained. The Scanning Electron Microscope (SEM) test results show that the composite beads have uniform size and good sphericity. The surface grains are basically similar to the cross-section grains. No obvious pores exist, and there is no abnormal large grain size. The particle size distribution test results show that the composite beads have relatively concentrated size distribution. The density test results show that the composite beads are dense and contain few pores.