Preparation of Electrical Porcelain by Stirred Bead Milling

In order to compare the efficiency of grinding of stirred bead milling and conventional boll milling,electrical porcelain was prepared by combined the two process.The size distribution of the powders was tested by laser particle size analyzer.The morphology of electrical porcelain compaction was analyzed with SEM.The flexural strength and electric insulating strength were tested according to national standard GB/T 775-2006.The results show that compared with the conventional drum-type ball milling,the grinding effect of stirred bead milling for 15 min was better than that of ball milling for 40 h.Prolonging the stirred bead milling time from 15min to 60 min could be obvious in refining particles of 10 μm or above in diameter.The particle size was less than 6 μm when the method of twice-adding was used in preparation of electrical porcelain body.By combination of ball milling and stirred bead milling,the electrical porcelain had a similar average particle size and little large size particles,about 50% milling time was saved.The effect of twice-adding process on electric insulating strength of the electrical material was small,and the flexural strength was enhanced by 20%-30%.