| 摘要 |
<p>PURPOSE:To evade the dispersion of varistor voltages, non-linear coefficients, etc., and improve a life characteristic and surge resistance by uniformizing the temperature and atmosphere at the time of thermally diffusing Na oxide, etc., in a semiconductor porcelain and removing the adhered Na compound. CONSTITUTION:When a varistor is manufactured by thermally diffusing Na oxide or Na compound in reduced and sintered semiconductor porcelain, the semiconductor porcelain and the Na oxide or the Na compound are stored in a magnetic container so as to allow thermal diffusion by rotating the container. Then the surface of the semiconductor porcelain is polished.</p> |
