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Influence of Aluminum on Structure and Properties of Self―reactive Spray Formed Preforms

Author(s): LIU Hong-Wei, WANG Jian-Jiang, MA Shi-Ning, SUN Xiao-Feng

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 7;
Start page: 715;
Date: 2011;
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Keywords: aluminum; performs; structure; properties

With composite powders of Ti―B4C―C and Ti―B4C―C―Al systems as reactants, Ti(C, N)―TiB2 ―based composite ceramic preforms were prepared by self―reactive spray forming technology. XRD, SEM, EDS and TEM were used to investigate the influence of 5wt% Al addition on the structure and properties of the preforms. It was shown that the performs made from Ti―B4C―C system were mainly composed of TiC0.3N0.7 and TiB2, with by―product phase of TiO2. Relative density, Vickers hardness, flexural strength and fracture toughness of Ti―B4C―C preforms were 97.2%, 17.3GPa, 387MPa and 6.0MPa·m1/2, respectively. By adding 5wt%Al in the sprayed system, the by―product of the preforms was the desirable phases of Al2O3 and Ti3Al, not TiO2, though the main phases of Ti―B4C―C―Al preforms remained to be TiC0.3N0.7 and TiB2. The length to diameter ratio of the TiB2 grains increased obviously. As a result, relative density, Vickers hardness, flexural strength and fracture toughness of Ti―B4C―C―Al preforms as―cended to be 97.7%, 20.6GPa, 425MPa and 7.3MPa·m1/2, respectively. The additive Al effectively restrained the oxidation of Ti in the spray forming process, which improved the mechanical properties of the preforms greatly.
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