Controlled grain size metal oxide varistor and process for making

摘要: Disclosed is a metal oxide varistor consisting primarily of with small percentage preselected additives distributed substantially evenly therethrough. A grain growth inhibitor combined the powder forming final mix peripheral regions having high concentration that surround and separate interior have low inhibitor. Varistor bodies are formed from retain their identities in bodies. The can be pressed sintered conventional manner. During sintering grains within each region tend to combine grow. However, stopped at due Thus, size processed pellet dependent upon which controlled. If desired, one chosen stimulate so as promote combination regions. One preferred method coalesce by techniques such spray drying then coat agglomerates thus