Abstract
Bulk porous Al 2O 3 support was fabricated using a mixture of fine α-Al 2O 3 powder and Al(OH) 3 particles, followed by pressureless sintering at temperatures between 1100°C and 1300°C. Al 2O 3 support with high surface area was obtained, due to the presence of transitional Al 2O 3 phases that were produced by the decomposition of Al(OH) 3 even after sintering. The Al 2O 3 support exhibited superior mechanical properties and high strain to failure, compared with those fabricated by traditional methods. The strain to failure increased with the amount of Al(OH) 3 in the mixture, but decreased with increasing sintering temperature. A conceptual model for the microstructural evolution and reinforcing mechanisms, based on transmission electron microscopy (TEM) observations, is proposed. It reveals that the interface bonding of the Al 2O 3 boundaries formed at the initial nucleation stage during θ- to α-Al 2O 3 transformation is stronger than that formed by subsequent grain growth. The interface bonding between the Al 2O 3 grains, which came from the decomposition of Al(OH) 3, is stronger than that between the original Al 2O 3 grains in the starting mixture.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
