Overview of acoustic emission in monitoring powder technology

Session 3-2: Quantitative Studies of AE on Composite MaterialsInternational audienceAcoustic emission has been successfully applied for monitoring a large variety of industrial processes. In this overview of several studies of application of acoustic emission in powder technology, we try to develop this non-destructive technique in some processes with powder. Acoustic emission during powder compaction allows us to understand the behaviour of brittle materials and quantify the fragmentation of such powders. With visco-elastic powder, the compaction is different and we recorded weak acoustic emission. For crystallisation processes, we have an information of the beginning of nucleation of crystals before all others experimental on-line techniques. We can have also other information of crystal growth, crystal size and if we have re-dissolution of the product. Another process with powder is a slurry transport in a flow loop. The first experiments shows also the first moments of crystallisation but we can have also information of flow pattern of the slurry and also the former emulsion state. To finish, we will discuss on a beginning fundamental work on acoustic emission of particle impact on several surfaces. This work will help us to better characterize all these processes with powders