A method for the preparation of raw powder for the tantalum capacitor: Influence of particle size and binder content

Raw powder for use in the tantalum solid electrolytic capacitor was prepare d by different processes, that is, the wet method (currently used conversio n method) and the dry method (the proposed method). The properties of prepa red powder from the dry method were compared with those of the wet method. The present report has focused on the relationship between the conditions o f binder preparation and the properties of the prepared powder, such as the particle size distribution, angle of repose, and the tap density, respecti vely. Furthermore, the utility of the dry method was investigated. Based on the results, it has been clarified that the properties of powder p repared by the dry method differ from those of the wet method. In the case of the dry method, it is suggested that the mechanism of preparation of the fine binder (PMMA powder) differs from that of the coarse binder. Furtherm ore, based on the experimental results, it has been suggested that the dry method could be used as the preparation method of the raw powder used in th e tantalum solid electrolytic capacitor.