Improved High-Temperature Microscope and Its Metallurgical Applications

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Abstract
A high-temperature microscope has been designed and constructed for the observations of thermal transition phenomena. By the use of a new mechanical stage, rotatable quartz window and micro-furnaces, the dynamic phenomena can be continuously observed on the area 10 mm in diameter on a specimen surface. Moreover, the microscope enabled an uninterrupted observations for more than 6 minutes at 1200°C in low pressure of hydrogen. Three types of micro-furnaces were designed for the purpose of heat-treatment and observation below 1550°C for specimens of different shapes. Using this microscope, structure-changes accompanied by grain growth have been successively observed for silicon-iron. The resultant resolution was 1–2 µ on photographs at 1100°C.

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