C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/1
C04B 35/00 (2006.01) C03C 4/08 (2006.01) C03C 4/10 (2006.01) C03C 10/00 (2006.01) C04B 35/115 (2006.01) C04B 35/18 (2006.01) C04B 35/486 (2006.01)
Patent
CA 2319367
In order to provide a tubular or a rod-like ceramic article which is opaque to a visible light and which enables easy and efficient measurement and inspection of its internal structure, the tubular or the rod-like ceramic article opaque to a visible light is made of an infrared transmitting ceramics having a transmittance not less than 45% for an infrared ray having a wavelength of 1500nm and incident from the air when the thickness is equal to 1 mm. Preferably, the ceramic article is made of an infrared transmitting ceramics which satisfies the condition given by (1-R)2 ~ 0.84 and µ ~ 0.7/mm where R represents a reflectance at 1550nm and µ represents a sum of a scattering coefficient and an absorption coefficient.
L'invention concerne un article céramique en forme de tube ou de tige, opaque à la lumière visible et dont on peut mesurer et inspecter attentivement la structure interne. Cet article est fabriqué à partir d'une céramique transparente aux rayons infrarouges qui possède une transmittance de 45 %, son épaisseur étant de 1 mm compte tenu du fait que la longueur d'onde des rayons infrarouges traversant l'air et incidents à la céramique est de 1550 nm. Le pouvoir de réflexion R de la céramique par rapport à la longueur d'onde de 1550 nm répond de préférence à l'inéquation (1-R)<2>>/=0,84, et la somme mu du coefficient de réflexion et du coefficient d'absorption répond de préférence à l'inéquation mu </=0,7/mm.
Sakamoto Akihiko
Wada Masanori
Dennison Associates
Nippon Electric Glass Co. Ltd.
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