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

doi:10.3724/SP.J.1077.2011.00715

Abstract

Abstract: 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 TiC_0.3N_0.7 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·m^1/2, 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 TiC_0.3N_0.7 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·m^1/2, respectively. The additive Al effectively restrained the oxidation of Ti in the spray forming process, which improved the mechanical properties of the preforms greatly.

Key words: aluminum, performs, structure, properties

CLC Number:

TB333

LIU Hong-Wei, WANG Jian-Jiang, MA Shi-Ning, SUN Xiao-Feng. Influence of Aluminum on Structure and Properties of Self-reactive Spray Formed Preforms[J]. Journal of Inorganic Materials, 2011, 26(7): 715-720.

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