Tube Shaping, Drying and Firing

The influence of the presence or absence of lubricants on the extrusion pressure, which decreases when the percentage of lubricant increases, and on the compaction of the ceramic can be seen in Fig. 5.7. 

After extrusion, the tubes expand due to the relaxation of the elastic paste after compression. This relaxation must be taken into consideration for the drying shrinkage. 

5 — CERAMIC PROCESSING TECHNIQUES OF SUPPORT SYSTEMS EOR MEMBRANES SYNTHESIS 

The firing treatment strengthens the ceramic. This treatment must be established on the basis of a thermal study to determine the elimination temperature of bonded water and organic additives and, eventually, the temperature of 

Several workers [10,11] describe the sintering mechanism in oxide powders as a diffusion of vacancies in the ceramic. The grain growth corresponds to a reduction of surface free energy. 

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