Abstract
The Vickers hardness (Hv), Young's modules (E), fracture toughness (KIC) and bending strength (σf) of a glass and an α-type polycrystalline cordierite with the cordierite composition (2MgO⋅2Al2O3⋅5SiO2) were measured using Vickers indentation, resonance method, various indentation techniques and 3-point bending test. The polycrystalline cordierite was fabricated by densification and subsequent crystallization of compacted cordierite glass powder. The Hv, E and KIC of a polycrystalline cordierite were 7.5GPa, 127.5GPa and 2MPa⋅m1/2, while those of cordierite glass were 5.9GPa, 98.7GPa and 1.0MPa⋅m1/2, respectively. On the other hand, the σf (113MPa) of a polycrystalline cordierite was smaller than that (149MPa) of a cordierite glass.
