Preparation and Mechanical Properties of Zirconia-Mullite Nano-Comoposites from TiO₂-Doped Si-Al-Zr-O Amorphous Bulk

Abstract:

Zirconia-mullite nanocomoposites were prepared from TiO₂-doped Si-Al-Zr-O amorphous bulks according to a two-step heating treatment between 880 and 1250°C. Effects of TiO₂ amount and heat treatment conditions on the mechanical properties have been investigated. The fracture toughness was much more affected by the heat treatment processing than by amount of TiO₂. With increasing amount of TiO₂ (2.5~10 wt %), the fracture toughness gradually decreases. Nucleating temperature and time and crystallization temperature and time are interrelated. The fracture toughness of the sample with 5 wt% TiO₂ nucleated at 920°Cfor 2.0 h and crystallized 1150°Cfor 4.0 h is 7.48 MPa•m^1/2.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 1604-1609
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.1604
• Online since: November 2011
• Authors: Xiao Ping Tan, Shu Quan Liang, Li Yuan Chai
• Keywords: Amorphous Bulk, Nano-Comoposites, Two-Step Heat Treatment, Zirconia-Mullite

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