| 摘要 |
PURPOSE:To easily detect a microdefect of even unsintered ceramics whose surface is porous by coating the surface with a fluorescence penetrant and making the penetrant penetrate the surface, coating the surface with specific inspection liquid, and projecting an ultraviolet ray. CONSTITUTION:The surface of the product is coated with the fluorescence penetrant and left for 1-2min as it is to make the fluorescence penetrant 1 penetrate the surface and crack 3 of the unsintered ceramics 2. Then the surface coated with the fluorescence penetrant 1 is further coated with the inspection liquid 4 of specific composition and the fluorescence penetrant 1 and inspection liquid 4 react to form a filmy layer 5 which is transparent to light in the ultraviolet-ray range. At this time, the fluorescence penetrant 1 penetrating the crack 3 reacts on the inspection liquid 4 and its upper part becomes transparent to the light in the ultraviolet ray range, but the fluorescence penetrant 1 is left inside without being removed. In this state, the surface is irradiated with ultraviolet light, fluorescent light is generated by the fluorescence penetrant 1 left in the crack through the filmy layer 5 and the crack 3 can be confirmed visually. |
