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A novel functionally gradient Ti/TiB/TiC hybrid composite with wear resistant surface layer
Rajesh Chaudhari,
Published in Elsevier Ltd
2018
Volume: 744
   
Pages: 438 - 444
Abstract
Ti/TiB/TiC hybrid composite was processed by a novel one-step in-situ process using spark plasma sintering (SPS). KBF4, which was used as a boron precursor for the first time, reacted with Ti to form the TiB reinforcement insitu. Graphite foils were used on either side of the compact as a carbon source to produce TiC during sintering. Ti reacted with carbon and formed TiC on both the surfaces of the composite. The thickness of the TiC layer was found to be ∼50 μm. The microstructure of the composite was graded with ultrafine TiC on top, fine needles of TiB near the surface and coarser TiB whisker reinforced Ti (Ti-4Al-2Fe/TiBw) in the bulk. The grain size of Ti also varied from 1 μm near the surface to 12 μm in the bulk. The surface layer exhibited very high hardness to the tune of 20 GPa compared to 7 GPa of the bulk Ti-4Al-2Fe/TiB composite. The functionally gradient composite exhibited only mild wear with wear rate that was almost one order of magnitude lower than that of the bulk Ti-4Al-2Fe/TiBw composite. While there were abrasive grooves formed on the Ti-4Al-2Fe/TiB bulk composite, the hybrid composite showed almost nil wear damage under the same test conditions. The surface TiC layer thus acted as an effective protection against wear and tear. © 2018 Elsevier B.V.
About the journal
JournalData powered by TypesetJournal of Alloys and Compounds
PublisherData powered by TypesetElsevier Ltd
ISSN09258388
Open AccessNo
Concepts (19)
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    Aluminum
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    Aluminum compounds
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    Iron compounds
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    Metallurgy
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    Reinforcement
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    Sintering
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    Spark plasma sintering
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    TITANIUM CARBIDE
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    Wear of materials
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    Wear resistance
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    BULK COMPOSITES
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    Coating material
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    FUNCTIONALLY GRADIENT
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    GRAPHITE FOILS
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    Hybrid composites
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    METALS AND ALLOYS
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    Test condition
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    WEAR RESISTANT
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    Metallic matrix composites