Synthesis of ultrafine composite from elemental powders of Ni-Al-Nb-B via combustion synthesis |
Paper ID : 1511-UFGNSM-FULL |
Authors: |
Abstract: |
In this study NbB2 reinforced Ni–Al ultrafine composite was fabricated using thermal explosion mode of combustion synthesis from the elemental of Ni, Al, Nb, and amorphous Boron powders. Microstructural evaluation and characterization of the end product together with elemental map distributions were inspected using scanning electron microscopy (SEM) and wavelength dispersive spectroscopy (WDS) respectively. Phase determination and chemical composition of the phase in the reaction product were identified by XRD method. The products contained NiAl and NbB2 compounds without any intermediate phases. The NbB2 particles were homogenously dispersed into the NiAl matrix. Particle size of NbB2 reinforcements were in the range of 523±365 nm for NiAl-10wt % NbB2 which rose to 977±551 nm for NiAl-40wt % NbB2 as a result of increasing the reaction temperature with increasing the amount of boride phase. The dimension and distribution of reinforcement makes the intermetallic composite powders suitable as precursor for thermal spray applications. |
Keywords: |
thermal explosion, SHS, NiAl, composite, coating materials |
Status : Paper Accepted (Poster Presentation) |