Mechanical Properties of the Directionally Solidified Ceramic Eutectic of Al_2O_3/Al_(16)Ti_5O_(34) Phase Structure

摘要

Al_2O_3/TiO_2 eutectics containing 62-64 wt% Al_2O_3 were fabricated by a laser floating zone method. Raman spectrometry was used to determine the phase composition. The compressive creep strength of AT36 (Al_(16)Ti_5O_(34)/ Al_2O_3) crystal at 1500℃ under the strain rate of 1.0 × 10~(-4) s~(-1) has 372 MPa, which is about higher than β-Al_2TiO_5 and β-Al_2TiO_5/Al_2O_3 crystals. High-temperature flexural strength, elastic modulus, hardness and fracture toughness of the AT36 crystals were analyzed. The highest flexure strength at ambient temperature was found in the material with 36 wt% TiO_2. In addition, we briefly discussed the relationships between microstructure and mechanical properties in AT36 crystal.