Application Of Stirred Bead Milling For The Preparation Of Electrical Porcelain

Size dimension, size distribution and the max size of grains affects quality of ceramic body and follow-up whole technology process, thus affecting the product quality. overwhelming majority of civil electrical porcelain factories still use traditional ball milling, which has the advantage of operating easy and reliable running, however ball milling has long work time, high energy cost, coarse grain size and wild size distribution.Comparing various kinds of powder preparation methods, stirred milling has advantage of high manufacture efficiency and narrow distribution range, which make up for ball milling's shortage. In this foundation, stirred beads milling has been developed by our lab with no cooling jacket. Barrel intine and agitator are lined with wearable PU according to hard electrical porcelain material. Barrel has smaller diameter and longer length. Grinding media isφ3mm Al2O3 ball which is one of electrical porcelain material.Based on the character of main electrical porcelain material alumina,feldspar and quartz, this paper used ball milling,planetary milling and stirred beads milling to search on abrasive nature of these three powder. Our experimental findings show efficiency of stirred beads milling have increased by dozens of times at ball milling. Meanwhile with same average grain diameter, big particles are obviously smaller,and size distribution is narrower with concentration in D50.This article also study on the practical application of stirred beads milling aimed at combining insulator raw materials and practical production situation of both Pingxiang Huawei Electrical Porcelain & Electrical Equipment Co,Ltd. and Suzhou Porcelain Insulator Works.With the same mean size of 5μm, Huawei insulator blank powder propotion of size smaller than 10μm increases from 85% to 95%, using the way of 20min stirred beads milling after 8h ball milling to instead of simple 14h ball milling. By combining stirred beads milling with ball milling, percentage of particles whose size below 15μm is up to 99.81%.Meanwhile porcelain bending strength was improved by 17%. For suspension insulator from Suzhou Porcelain Insulator,its density increased from 2.75 g/cm3 to 2.78 g/cm3, bending strength of unglazed strip raised to 232MPa from conventional strip of 172MPa, bending strength of white-glaze strip was enhanced from 247MPa to 269MPa,and dielectorni strength was 33KV/mm which was similar to conventional suspension insulator.The application foreground and results of combination stirred bead milling with ball milling to replace traditional ball milling for the preparation of electrical porcelain were introduced, based on existing material supply status and preparation technology. Such a method would change electrical porcelain materials processing radically, save energy and increase the homogeneity and reliability of electrical porcelain, especially by eliminating particles that are 15μm or more in diameter.