A method for improving the porosity of porous silicon nitride ceramics

Porous Si3N4 ceramics, due to their exceptional properties, have found widespread applications across various industries. However, common fabrication methods often lead to defects in the pore structure of porous ceramics, significantly compromising their performance. In this study, we achieved surface modification of Si3N4 powder by incorporating a silane coupling agent and subsequently produced porous Si3N4 ceramics with uniform complete spherical pore structures was carried out using a sacrificial template method. The results indicate that, compared to unmodified porous ceramics, the porosity of the modified Si3N4 ceramics is increased by 25 %. Furthermore, the organic groups on the surface of the modified Si3N4 ceramics effectively inhibit the excessive growth of the Si3N4 clusters within the pores, enabling precise control over the microscopic pore structure. This research provides valuable insights into the achievement of a spherical pore structure and offers a novel approach for precise pore structure control.