Combustion synthesis processing of functionally graded materials in the Ti–B binary system

In this study, fabrication of functionally graded materials from elemental powders of Ti and B by utilizing combustion synthesis technique was investigated. The technique was chosen because it exploits the exothermic reaction between titanium and boron. The control of the reactions was achieved by s...

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Bibliographic Details
Published in:Journal of alloys and compounds 2002-12, Vol.347 (1), p.259-265
Main Authors: Cirakoglu, M, Bhaduri, S, Bhaduri, S.B
Format: Article
Language:English
Subjects:
Chemical synthesis
combustion synthesis
Composite materials
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Materials synthesis
materials processing
Physics
Single-crystal and powder diffraction
Solid state reactions
Structure of solids and liquids
crystallography
Transition metal alloys
X-ray diffraction
X-ray diffraction and scattering
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Summary:In this study, fabrication of functionally graded materials from elemental powders of Ti and B by utilizing combustion synthesis technique was investigated. The technique was chosen because it exploits the exothermic reaction between titanium and boron. The control of the reactions was achieved by selecting compositions away from the stoichiometry without resorting to adding a third element into the system. Compositionally graded trilayered (Ti-10–18 wt.%B, Ti-5–15 wt.%B) and five layered (Ti-5–10–15–18 wt.%B) green compacts were ignited. The influence of the composition selection and the temperature on propagation and product formation was studied. In order to achieve more control of the exothermic reactions, the titanium side was ignited first. Therefore in functionally graded material (FGM) compacts, a relatively longer ignition time and higher reaction temperatures were recorded compared to corresponding single compositions. X-ray diffraction studies showed that, due to high exothermicity, TiB and TiB 2 formed even at off-stoichiometric compositions. Such reactions produced FGMs with titanium on one side to Ti–TiB–TiB 2 on the other. The as-fabricated Ti–TiB–TiB 2 graded composite materials exhibited continuous and crack free interfaces.
ISSN:0925-8388
1873-4669
DOI:10.1016/S0925-8388(02)00499-1