Sumitomo Electric Industries, Limited

Kozo Ishizaki

Akira Yamakawa

Masaya Miyake

Koji Watari

For evaluating mechanical properties of ceramics such as silicon nitride in a nondestructive manner, a specific heat of ceramic test samples to be evaluated is measured at a temperature not higher than room temperature. A comparison is made between a measured value of the specific heat of the test sample and a known value of a specific heat of a ceramic reference sample at the same temperature not higher than room temperature. The comparison, permits making conclusions regarding the mechanical properties of the ceramic test samples based on the known mechanical properties of the ceramic reference sample. The creep strength is given as one example of the mechanical properties that may be ascertained by a nondestructive inspection that may be part of a production line, whereby the mechanical properties of the individual ceramic products may be guaranteed in practice.

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Niigata, Japan

Kozo Ishizaki