材料期刊网

An innovative approach has been developed to fabricate reticulated porous ceramics (RPCs) with uniform macrostruc-ture by using the polymeric sponge as the templates. In this approach, the coating process comprises of two stages,In the first stage, the thicker slurry was used to coat uniformly the sponge substrate. The green body was preheatedto produce a reticulated preform with enough handling strength after the sponge was burned out. In the second stage,the thinner slurry was used to coat uniformly the preform. The population of the microscopic and macroscopic flawsin the structure is reduced significantly by recoating process. A few filled cells and cell faces occur in the fabricationand the struts were thickened. A statistical evaluation by means of Weibull statistics was carried out on the bendstrength data of RPCs, which were prepared by the traditional approach and innovative approach, respectively. Theresult shows that the mechanical reliability of RPCs is improved by the innovative approach. This innovative approachis very simple and controlled easily, and will open up new technological applications for RPCs.