How do porosity indications in ceramics typically appear?

In ceramics, porosity indications typically appear as fine, small voids or imperfections that are not as pronounced as those seen in metals. The structure of ceramics is quite different from that of metals; thus, while both can exhibit porosity, the nature of these indications varies.

Ceramic materials often have a denser and more uniform structure compared to metals. As a result, when porosity is present, it manifests as small, discrete points of concern rather than larger, more pronounced features. This means that the indications may not be as easily visible or as prominent as one would find in metallic materials, where indications might be larger or come paired with other types of defects.

Understanding this distinction is essential for accurate interpretation during liquid penetrant testing of ceramics and helps differentiate between the types of materials being inspected. It ensures that the technician can adjust their techniques and expectations accordingly when assessing ceramic parts.