Effect of Reaction Atmosphere and Heating Rate during Reactive Sintering of Ni-Ti Intermetallics

0509859 - FZÚ 2020 RIV NL eng C - Conference Paper (international conference)
Novák, P. - Kadlecová, B. - Salvetr, P. - Knaislová, A. - Školáková, A. - Karlík, M. - Kopeček, Jaromír
Effect of Reaction Atmosphere and Heating Rate during Reactive Sintering of Ni-Ti Intermetallics.
Procedia Engineering, vol. 184. Amsterdam: Elsevier Ltd., 2017 - (Choudhury, I.; Metselaar, H.; BinYusoff, N.), s. 681-686. ISSN 1877-7058.
[Advances in Material and Processing Technologies Conference (AMPT 2016). Kuala Lumpur (MY), 08.11.2016-11.11.2016]
R&D Projects: GA ČR(CZ) GA14-03044S
Institutional support: RVO:68378271
Keywords : intermetallic compounds * powder metallurgy * electron microscopy * microstructure * thermal analysis * thermogravimetry
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)

The effect of reaction atmosphere and heating rate during reactive sintering of nickel and titanium powder blend (Ni: 52 at.%, particle size <150 μm, >99.99% purity, Ti: 48 at.%, particle size <44 μm, >99.5% purity) were studied. The powder mixtures were uniaxially compressed under pressure of 637 MPa and sintered at temperatures 500, 650, 900 and 1100 °C in air, vacuum, argon and nitrogen atmospheres. Two heating rates were applied: 200 and >300 K.min-1. The results show that a significant effect of reaction atmosphere in terms of the quantity of the Ti2Ni phase applies especially at very high heating rate. In terms of phase morphology, oxygen causes refinement of the structure, regardless of heating rate.

Permanent Link: http://hdl.handle.net/11104/0300482