Which of the following statements about porous ceramic materials is false?

The statement that ceramics experience low tensile strength and are brittle, causing high fracture resistance is misleading and, therefore, classified as false. While it's accurate that ceramics generally exhibit low tensile strength and are known for their brittleness, this brittleness does not contribute to high fracture resistance. In fact, the brittleness of ceramics tends to lead to their susceptibility to fracture under tensile loads rather than imparting additional resistance.

In practice, high fracture resistance typically correlates with materials that can deform plastically without failing, which ceramics do not do well due to their brittle nature. Thus, the characterization of ceramics in this statement misrepresents their mechanical behavior, particularly under tensile stress, making it an erroneous assertion about porous ceramic materials.

In contrast, the other provided statements regarding porous ceramic materials highlight various true aspects, such as their lower strengths compared to metals (useful in coatings), their classification as inorganic compounds, and the bioactivity of certain ceramics when interacting with bone tissue.