PT Journal
AU Salvetr, P
   Kubatik, T
   Novak, P
TI Preparation of Ni-Ti Shape Memory Alloy by Spark Plasma Sintering Method
SO Manufacturing Technology Journal
PY 2016
BP 804
EP 808
VL 16
IS 4
DI 10.21062/ujep/x.2016/a/1213-2489/MT/16/4/804
DE powder metallurgy; reactive sintering; spark plasma sintering; Ni-Ti alloy
AB This paper aims to describe powder metallurgy methods of production Ni-Ti shape memory alloy - self-propagating high-temperature synthesis (SHS) and spark plasma sintering (SPS). There are compared microstructures and phase compositions of alloys produced by SHS and by a technology containing SHS, milling and SPS. At the same time there is determined the influence of the SPS sintering temperature on the structure of Ni-Ti alloy. Self-propagating high-temperature synthesis was initiated at 1100°C with process duration 20 minutes the heating rate of approx. 300 °C/min. The product is highly porous and contains undesirable Ti2Ni phase. The SPS technique allows to obtain product with low porosity. The disadvantages of SPS technique are growing amount of Ti2Ni phase and formation of other undesirable phases (Ni4Ti3 and Ni3Ti).
ER