NiTi equiatomic composition is used in atmospheric plasma spraying (APS) machine to coat the stainless steel substrate. APS was conducted with varying critical plasma spraying parameters (CPSP) using NiTi powder as a coating element. After coating, the surface and interface morphology were characterised by XRD, SEM, and hardness tester. Higher CPSP yields better surface morphology. Surface roughness and porosity percentage decrease, and hardness increases from (455–844) Vickers hardness number with CPSP. The residual stress varies from 73 ± 1.1 MPa to −95 ± 1.9 MPa which shows the stress conversion of coating from tensile to compressive with an increase in CPSP. Coating failure occurs as a combined result of adhesion, cohesion and glue joint failure. At 865 CPSP, coating shows highest adhesion strength 42.13 MPa.
CincaNIsalguéAFernándezJ, et al.Structure characterization and wear performance of NiTi thermal sprayed coatings. Smart Mater Struct2010; 19: 085011.
3.
VerdianMMRaeissiKSalehiM. Corrosion performance of HVOF and APS thermally sprayed NiTi intermetallic coatings in 3.5% NaCl solution. Corros Sci2010; 52: 1052–1059.
4.
StellaJSchüllerEHeßingC, et al.Cavitation erosion of plasma-sprayed NiTi coatings. Wear2006; 260: 1020–1027.
5.
VerdianMMSalehiMRaeissiK. Effect of feedstock particle size on microstructure of APS coatings prepared from mechanically alloyed nickel–titanium powders. Surf Eng2010; 26: 447–452.
6.
GuilemanyJMCincaNDostaS, et al.Corrosion behaviour of thermal sprayed nitinol coatings. Corros Sci2009; 51: 171–180.
7.
SwainBBajpaiSBeheraA. Microstructural evolution of NITINOL and their species formed by atmospheric plasma spraying. Surf Topogr Metrol Prop2019; 7: 015006.
8.
SongEPAhnJLeeS, et al.Effects of critical plasma spray parameter and spray distance on wear resistance of Al2O3–8wt.%TiO2 coatings plasma-sprayed with nanopowders. Surf Coatings Technol2008; 202: 3625–3632.
9.
ZhaoDLuoFZhouW, et al.Effect of critical plasma spray parameter on complex permittivity and microstructure by plasma spraying cr/Al2O3 coatings. Appl Surf Sci2013; 264: 545–551.
10.
ZhangXYangQChenL, et al.Fabrication and characterization of 8YSZ ceramic-based abradable seal coatings by atmospheric plasma spraying. Ceram Int2020; 46: 26530–26538.
11.
SobhanverdiRAkbariA. Porosity and microstructural features of plasma sprayed Yttria stabilized Zirconia thermal barrier coatings. Ceram Int2015; 41: 14517–14528.
12.
ZhangJHuangWHuT, et al.Effect of critical plasma spray parameters on microstructure and mechanical properties of plasma-sprayed YSZ-20wt%LSM composite coating. J Therm Spray Technol2022; 31: 436–448.
13.
SwainBMantrySMohapatraSS, et al.Investigation of tribological behavior of plasma sprayed NiTi coating for aerospace application. J Therm Spray Technol2022; 31: 2342–2369.
14.
ArunaSTBalajiNShedthiJ, et al.Effect of critical plasma spray parameters on the microstructure, microhardness and wear and corrosion resistance of plasma sprayed alumina coatings. Surf Coatings Technol2012; 208: 92–100.
15.
E2109 − 01 (2014). Standard test methods for determining area percentage porosity in thermal sprayed coatings. ASTM Int1987; 01: –8.
PatelSKBeheraA. Evolution of phases and their influence on shape memory effect by varying sintering parameters of NiTi alloys. Met Mater Int2022; 28: 2691–2705.
18.
BitzerMRauhutNMauerG, et al.Cavitation-resistant NiTi coatings produced by low-pressure plasma spraying (LPPS). Wear2015; 328–329: 369–377.
19.
LeeJHwangJLeeD, et al.Enhanced mechanical properties of spark plasma sintered NiTi composites reinforced with carbon nanotubes. J Alloys Compd2014; 617: 505–510.
20.
ParidaJMishraSCMarupalliBCG, et al.Fabrication of nickel-titanium-iron shape memory alloys by powder metallurgy route and analyses of their physical and mechanical behaviour. Powder Metall2023; 66: 557–570.
21.
SwainBBeheraA. Effect of powder feed rate on adhesion strength and microhardness of APS NiTi coating: a microstructural investigation. Surf Topogr Metrol Prop2021; 9: 025039.
22.
LuFHuangWLiuH. Mechanical properties and thermal shock resistance of 8YSZ-Al2O3 composite coatings with different thicknesses. J Therm Spray Technol2019; 28: 1893–1905.
23.
ChenSXiangJHuangJ, et al.Microstructures and properties of double-ceramic-layer thermal barrier coatings of La2(Zr0.7Ce0.3)2O7/8YSZ made by atmospheric plasma spraying. Appl Surf Sci2015; 340: 173–181.
24.
Hajizadeh-OghazMRazaviRSGhasemiA, et al.Na2SO4 and V2O5 molten salts corrosion resistance of plasma-sprayed nanostructured ceria and yttria co-stabilized zirconia thermal barrier coatings. Ceram Int2016; 42: 5433–5446.
25.
HuangWZhaoYFanX, et al.Effect of bond coats on thermal shock resistance of thermal barrier coatings deposited onto polymer matrix composites via air plasma spray process. J Therm Spray Technol2013; 22: 918–925.
HuangWZengNZhongR, et al.Effects of critical plasma spraying parameters on microstructure and mechanical properties of LaPO4-8YSZ thick composite coatings. J Alloys Compd2023; 938: 168688.
28.
MutterMMauerGMückeR, et al.Correlation of splat morphologies with porosity and residual stress in plasma-sprayed YSZ coatings. Surf Coatings Technol2017; 318: 157–169.
29.
WaitzTKazykhanovVKarnthalerHP. Martensitic phase transformations in nanocrystalline NiTi studied by TEM. Acta Mater2004; 52: 137–147.
30.
GhasemiRShoja-RazaviRMozafariniaR, et al.Comparison of microstructure and mechanical properties of plasma-sprayed nanostructured and conventional yttria stabilized zirconia thermal barrier coatings. Ceram Int2013; 39: 8805–8813.
31.
ThirumalaikumarasamyDShanmugamKBalasubramanianV. Establishing empirical relationships to predict porosity level and corrosion rate of atmospheric plasma-sprayed alumina coatings on AZ31B magnesium alloy. J Magnes Alloy2014; 2: 140–153.
32.
CtiborPLechnerováRBenešV. Quantitative analysis of pores of two types in a plasma-sprayed coating. Mater Charact2006; 56: 297–304.
33.
TranATTHylandMMShinodaK, et al.Influence of substrate surface conditions on the deposition and spreading of molten droplets. Thin Solid Films2011; 519: 2445–2456.
34.
ZverevEASkeebaVYSkeebaPY, et al.Defining efficient modes range for plasma spraying coatings. IOP Conf Ser Earth Environ Sci2017; 87: 082061.
35.
HuangJWangWLuX, et al.Influence of lamellar interface morphology on cracking resistance of plasma-sprayed YSZ coatings. Coatings2018; 8: 87.
36.
OdhiamboJGLiWZhaoY, et al.Porosity and its significance in plasma-sprayed coatings. Coatings2019; 9: 60.
37.
MauerG. Plasma characteristics and plasma-feedstock interaction under PS-PVD process conditions. Plasma Chem Plasma Process2014; 34: 1171–1186.
38.
ZhangXWangCYeR, et al.Mechanism of vertical crack formation in Yb2SiO5 coatings deposited via plasma spray-physical vapor deposition. J Mater2020; 6: 102–108.
