Thermal plasma spraying of NiTi powder for thick coating of shape memory alloy

• Published in: Journal of alloys and compounds Vol. 984; p. 173962
• Main Authors: Samal, Sneha, Zeman, Jakub, Kopeček, Jaromír, Šittner, Petr
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.05.2024
• Subjects: Coating; NiTi; Powder; Shape memrory behaviour; Substrate; Thermal plasma spraying; Substrate; Thermal plasma spraying; Coating; NiTi; Powder; Shape memrory behaviour
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2024.173962

In this article, NiTi coating was fabricated via a thermal plasma process by tuning various parameters. The work aims to achieve shape memory behavior that could retained in the plasma-sprayed samples. Various plasma spraying process parameters such as plasma power, powder feed rate, spraying plan, and net powder spray were taken into consideration for the spraying. Microstructural, thermal, mechanical, and shape memory behavior was analyzed on the plasma-sprayed samples. Various phases austenite, martensite, and intermetallic phases such as NixTiy, Ni-Ti-O, Ni, and Ti were confirmed from the X-ray diffraction analysis. The presence of these phases in the samples contributes to the thermal transformation and mechanical behavior. A less heat-affected zone of 10 µm along the interface was confirmed without any diffusion of elements from the substrate to the coating layers. There was a homogenous distribution elemental composition of Ni and Ti throughout the coating layers. The shape memory behavior of the coating samples was confirmed by the thermo-mechanical analysis by performing the response in multiple cycles. [Display omitted] •An approach for successful fabrication of plasma sprayed NiTi coating on the substrate stainless steel•Ni50Ti50 particles were used for spraying in plasma arc by using power of 12 kW with powder feed rate 4.2 g/min.•The compact coating layers shows the presence of austenite, martensite, and intermetallic phases of NiTi alloy.•The plasma sprayed sample reflects the behavior of shape memory effect as the function of temperature.