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  CoB-TiB2 crystalline powders: Synthesis, microstructural analysis and their utilization as reinforcement agent

Khoshsima, S., Altıntaş, Z., Burkhardt, U., Schmidt, M., Prashanth, K., Somer, M., et al. (2020). CoB-TiB2 crystalline powders: Synthesis, microstructural analysis and their utilization as reinforcement agent. Advanced Powder Technology, 1-9. doi:10.1016/j.apt.2020.05.026.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-A33A-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-A33E-D
Genre: Journal Article

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 Creators:
Khoshsima, S.1, Author
Altıntaş, Z.1, Author
Burkhardt, Ulrich2, Author              
Schmidt, Marcus3, Author              
Prashanth, K.G.1, Author
Somer, M.1, Author
Balcı, Ö.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863422              
3Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863415              

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Free keywords: Bulk properties, Cobalt boride, Low temperature synthesis, Microstructural characterization, Titanium diboride, Aluminum alloys, Borides, Boron, Chlorine compounds, Compressive strength, Molar ratio, Particle size, Particle size analysis, Reinforcement, Sodium Borohydride, Temperature, Ternary alloys, Transition metals, Autogenic pressure, Average particle size, Composite nanostructures, Crystalline powder, Enhanced hardness, Low temperature approaches, Microstructural analysis, Transition element, Powder metals
 Abstract: Due to promising mechanical and chemical properties, transition metal borides have attracted attention, and numerous studies have investigated various combinations of transition elements in hopes of acquiring a final product with desired properties combined. In this study, novel low-temperature approach was adopted for the synthesis of cobalt-titanium-boron based crystalline powders. The method was based on the single-step direct reaction of CoCl2(s), TiCl4(l) and NaBH4(s) in a sealed reactor under autogenic pressure. After the reaction of the precursors at 850 °C by using the molar ratios of metal chlorides to NaBH4 as 1:3, CoB and TiB2 phases were formed in-situ. The subsequent annealing process at 1100 °C achieved a full conversion of metal chlorides to CoB-TiB2 composite nanostructures. It was concluded that the binary forms of the borides tend to form as separate phases, which is illustrated in the SEM/EDS analyses with different morphologies. Amorphous boron layer surrounded TiB2 particles with an average particle size of 60 nm, whereas the CoB particles formed agglomerates with an average size of 450 nm. The use of synthesized composite powders as reinforcement in metal matrices resulted in enhanced hardness (506 HV) and compressive strength (1682 MPa) of the Ti6Al4V bulk samples. © 2020 The Society of Powder Technology Japan

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Language(s): eng - English
 Dates: 2020-05-192020-05-19
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1016/j.apt.2020.05.026
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Title: Advanced Powder Technology
Source Genre: Journal
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Publ. Info: Elsevier B.V.
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 1 - 9 Identifier: ISSN: 0921-8831
CoNE: https://pure.mpg.de/cone/journals/resource/0921-8831