High Temperature Alkali Metal Resistant Insulation

摘要

Five-hundred hour corrosion tests in 850 C potassium vapor have been completed on additional materials. Ceramic-to-metal seals were fabricated by hot pressing techniques and also by active metal brazing. Electrical testing of the active metal braze seal in potassium vapor was conducted at 600 C. A preliminary test transformer constructed of potassium resistant materials was electrically tested in argon at three different temperatures up to 600 C. The same transformer was electrically energized and tested in potassium vapor at room temperature, 290, 330 and 450 C. (Author)