Capillary-rheometric determination

The objectives of capillary-rheometric determinations to characterize the extrusion characteristics of ceramic compounds are many, ranging from simple tests to complex determinations of material properties in order to perfect the extrusion process and extrusion dies. Figure 3 shows the possible uses of these determinations and the equipment used. The possibilities of capillary-rheometric tests are explained with the help of some examples. 

Fig. 6 The results of capillary-rheometric determinations on aluminium oxide compounds...

In this article, we have described methods of determination ranging from simple tests to the complete rheological analysis of extrusion characteristics, ceramic compounds used to make catalyst supports serving es example. We have also discussed characteristic phenomena which influence the extrudability of ceramic compounds. Finally, we have compared the results of capillary-rheometric determinations and the extrusion of complex parts. 

A quick check of extrusion properties of ceramic compounds can be made using a simplified capillary-rheometric method. A one-point or two-point determination can, for example, make it possible to quickly select promising compound compositions. The accelerated test method was used in the development of a compound from aluminium oxide for making catalyst supports. Two criteria were here taken into account ... 

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