| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a tube-shaped or bar-shaped ceramic article which is capable of being easily and also efficiently measured and inspected with respect to an inside structure though the article is opaque to a visible light. <P>SOLUTION: A manufacturing method for a tube-shaped or bar-shaped ceramic article being opaque to a visible light, characterized in that it comprises a process wherein the ceramic article is prepared by using a material having transmittance of ≥45% at a thickness of 1 mm for an infrared light incident from the air and having a wavelength of 1,550 nm and satisfying (1-R)<SP>2</SP>≥0.84 and also μ≤0.7/mm wherein R is the reflectance at 1,550 nm and μ is the sum of a scattering coefficient and an absorption coefficient and a process for inspecting and measuring the inside structure of the ceramic article by using the infrared light. <P>COPYRIGHT: (C)2007,JPO&INPIT |
