Tic-TiB sub(2) Coating on Ti-6Al-4V Alloy Substrate in Graded Composition Achieved by Fusion Bonding and Atomic Interdiffusion under Combustion Synthesis in High-Gravity Field

Based on fusion bonding of liquid TiC-TiB sub(2) ceramic film and molten Ti-6Al-4XZ substrate to induce the surface alloying of Ti-6Al-4V substrate, the TiC-TiB sub(2) ceramic coating on Ti-6Al-4V substrate was achieved in graded composition by combustion synthesis in high-gravity field. XRD, FESEM...

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Bibliographic Details
Published in:Key engineering materials 2013-01, Vol.537, p.46-51
Main Authors: Huang, Xue Gang, Zhao, Zhong Min, Zhang, Long, Shi, Li Qing
Format: Article
Language:English
Subjects:
Ceramic bonding
Ceramic coatings
Combustion synthesis
Fusion bonding
Heat affected zone
Intermetallic compounds
Liquids
Titanium
Titanium base alloys
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Summary:Based on fusion bonding of liquid TiC-TiB sub(2) ceramic film and molten Ti-6Al-4XZ substrate to induce the surface alloying of Ti-6Al-4V substrate, the TiC-TiB sub(2) ceramic coating on Ti-6Al-4V substrate was achieved in graded composition by combustion synthesis in high-gravity field. XRD, FESEM and EDS results showed that TiC-TiB sub(2) ceramic coating was composed of fine TiB sub(2) platelets, TiC irregular grains, Cr metallic phase and a few Al sub(2)O sub(3) inclusions. The mechanical properties showed that the relative density, microhardness and fracture toughness of TiC-TiB2 ceramic coating reached 98.5%, 25.8 + or - 3.5 GPa and 16.5 + or - 2.5 MPa times m super(0.5), respectively. The fusion-bonding area and heat-affected zone of Ti alloy were obviously observed between the ceramic coating and Ti alloy substrate, and within the fusion bonding area a number of ultralfine TiB platelets and fine Ti-enriched carbides were embedded in the matrix of alpha -Ti martensite, whereas at the heat-affected zone of Ti-6Al-4V substrate some C, B atoms were also detected. As a coupled result of fusion bonding and inter-diffusion between liquid ceramic film and molten Ti alloy substrate, followed by TiB sub(2)-Ti peritectic reaction and subsequent eutectic reaction in TiC-TiB-Ti ternary system, the ceramic coating of TiC-TiB sub(2) on Ti-6Al4V substrate was achieved in continuously-graded composition, presenting the transitional change in microhardness from the ceramic coating to Ti alloy substrate with high shear strength of 450 + or - 35 MPa between the coating and the substrate.
ISSN:1013-9826
DOI:10.4028/www.scientific.net/KEM.537.46