Mechanical Properties of NiTi Plasma Spray Coating

Thermal plasma spraying method was used for coating the pre-prepared surfaces of turbine blades. Nickel (Ni) was used as a base material with a fixed percentage of alumina (5%Al2O3), and (5,10,15,20,25%) of Boron carbide (B4C) as reinforcement material. Cermet powders were mixed for one hour, then the coating bases of steel type (316L) were prepared and roughened using sandblasting to increase the adhesion strength between the coated materials and the base. The bonding material represented by (Ni-22% Cr-10%Al-1%Y) was sprayed with a thickness of (150µm), and then the base and reinforcement material were sprayed with a thickness of (350-400 µm). Thus, the final thickness of the prepared samples was (550-500 µm). After that, the samples were sintered at 900°C for two hours. The hardness test was applied to the samples, indicating the best hardness after sintering at (25%) reinforcement ratio of 590Hv. As for porosity, its lowest value was obtained at 7%, while the best value of adhesion strength was obtained after sintering at (25%) of B4C. However, the results of the scanning electron microscope (SEM) showed the weakness and the presence of pores in the coating layers at the low percentage of reinforcement. While the mechanical and physical properties were improved with the increase in the percentage of reinforcement to reach the best at 25% of B4C.

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“…This weight is known as (W 3 ). Determining the percentage of open pores (P o %) using the following equation [11]:…”

Section: Porosity Testmentioning

confidence: 99%

Using thermal spray coating method to produce system composites (Ni-Al2O3-B4C(

H.Jassim1¹,

Darweesh²,

Humeedi³

2022

Tikrit J. Pure Sci.

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“…Swain et al [6] investigated about the erosion behavior of the plasma sprayed NITINOL coating. In this work, the surface was eroded by 45 and 90° impingement angle of erodent.…”

Section: Erosive Wearmentioning

confidence: 99%

“…The plasma is generated by the ionization of gas by the arc. The feedstock materials injected through the gun nozzle into the plasma plume, where it is melted and propagated to the substrates (Figure 23) [2,6,[8][9][10][11][12].…”

Section: Plasma Spraying Processmentioning

confidence: 99%

Wear: A Serious Problem in Industry

Swain¹,

Bhuyan²,

Behera³

et al. 2021

Tribology in Materials and Manufacturing - Wear, Friction and Lubrication

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Wear is the damaging, gradual removal or deformation of material at solid surfaces. Causes of wear can be mechanical or chemical. The study of wear and related processes is known as tribology. Abrasive wear alone has been estimated to cost 1–4% of the gross national product of industrialized nations. The current chapter focuses on types of wear phenomena observed in the industries (such as abrasive wear, adhesive wear, fretting wear, fatigue wear, erosive wear and corrosive wear), their mechanisms, application of surface coating for the protection of the surface from the industrial wear, types of surface coatings, thermal spray coating, types of thermal spray coating and its application in industry to protect the surface from wear. The detail information about the wear phenomena will help the industries to minimize their maintenance cost of the parts.

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“…To overcome these de ciencies, several surface modi cation techniques like plasma nitriding, ion implantation, physical vapor deposition, liquid phase surface treatments, laser cladding, electroless, gas tungsten arc welding, and pulsed plasma electrolysis have been applied on these alloys [5][6][7][8][9][10][11][12]. The formation of diffusion coatings like nickel titanium compound (NiTi) has also drawn signi cant attention to combat wear [13][14][15][16]. NiTi intermetallic shows pseudoelasticity behavior [17,18] which is elastic responses to applied stresses, due to reversible martensitic phase transformation [19].…”

Section: Introductionmentioning

confidence: 99%

Comparative Tribological Study of NiTi Diffusion Coated Titanium with Pure Titanium

Khosravi

Sohi

Ghasemi

et al. 2021

Preprint

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Dry tribological behaviors of commercial pure (Cp) titanium and Cp titanium diffusion coated with equiatomic NiTi intermetallic layer were studied and compared at room temperature. Wear tests were performed by a pin on disk tribometer using 52100 steel pins, under various normal loads of 10, 20, and 40 N. worn surfaces were examined by scanning electron microscope, equipped with EDS analyzer. The wear rates of the coated materials were lower than those of the Cp titanium at all loads. This was mainly attributed to the higher hardness of the NiTi intermetallic layer compared to that of the untreated titanium. Furthermore, under an applying load of 10 N, a tribological layer was formed which could protect the surface from severe wear. The results also demonstrated a lower coefficient of friction in the treated specimens compared to those of the Cp materials.

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Mechanical Properties of NiTi Plasma Spray Coating

Cited by 43 publications

References 35 publications

Using thermal spray coating method to produce system composites (Ni-Al2O3-B4C(

Using thermal spray coating method to produce system composites (Ni-Al2O3-B4C(

Wear: A Serious Problem in Industry

Comparative Tribological Study of NiTi Diffusion Coated Titanium with Pure Titanium

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