Effect of self-propagating high-temperature combustion synthesis on the deposition of NiTi coating by cold spraying using mechanical alloying Ni/Ti powder

Zhou, Yong; Li, Chang‐Jiu; Wang, Hongduo; Li, Geng

doi:10.1016/j.intermet.2010.07.006

Cited by 27 publications

(16 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nickel titanium alloy powders fabricated by mechanical alloying process were employed to deposit Ni 50 Ti 50 alloy by cold spraying [16]. It was observed that a SHS phenomenon occurs during cold spraying of the mechanically alloyed powders.…”

Section: Cold Spraying Of Metastable Powders Obtained By Mechanical Amentioning

confidence: 99%

Utilization of mechanically alloyed powders for surface protective coating

El‐Eskandarany

2015

Mechanical Alloying

View full text Add to dashboard Cite

Section: Cold Spraying Of Metastable Powders Obtained By Mechanical Amentioning

confidence: 99%

Utilization of mechanically alloyed powders for surface protective coating

El‐Eskandarany

2015

Mechanical Alloying

View full text Add to dashboard Cite

“…In the past, this was applied to manufacture porous NiTi, e.g., for biomedical applications (Ref 27 ). In (Ref 28 ) it is reported that this phenomenon occurred also in cold gas spraying of mechanically alloyed NiTi particles (working gas helium, 2.0-2.5 MPa, 420-580 °C) leading to a partial melting which significantly decreased the deposition efficiency as many particles obviously splashed off the substrate on impact. A significant flashing was observed.…”

Section: Introductionmentioning

confidence: 97%

Cold Gas Spraying of Nickel-Titanium Coatings for Protection Against Cavitation

et al. 2020

View full text Add to dashboard Cite

Cavitation erosion is a sever wear mechanism that takes place in hydrodynamic systems. Examples are turbine vanes of hydropower plants or components of valves and pumps in hydraulic systems. Nickel-titanium shape memory alloys (NiTi) are attractive materials for cavitation-resistant coatings because of their pronounced intrinsic damping mitigating cavitation-induced erosion. In this work, NiTi coatings were produced by cold gas spraying. The phase transformation behaviors of the powder feedstock and the as-sprayed coatings were investigated. Regarding the obtained transformation temperatures, the measured substrate temperatures during spraying rule out that either the shape memory effect or the pseudoelasticity of NiTi could affect the deposition efficiency under the applied conditions of cold gas spraying. Another potential effect is stress-induced amorphization which could occur at the particle–substrate interfaces and impair particle bonding by stress relaxation. Moreover, also oxide formation can be significant. Thus, the presence of amorphous phases and oxides in the near-surface zone of particles bounced off after impact was investigated. Oxidation could be confirmed, but no indication of amorphous phase was found. Besides, also the evolution of local microstrains implies that the substrate temperatures affect the deposition efficiency. These temperatures were significantly influenced by the spray gun travel speed.

show abstract

“…Few studies have looked at CS of pre-alloyed Ni - Ti powder or mechanically activated elemental powders. For instance, the feasibility of Ni - Ti coating production by CS has been shown by depositing milled Ni - Ti powder mixtures (Ref 21 , 22 ) and blended Ni - Ti powders (Ref 24 ). The poor deformability of NiTi intermetallic has shown to be a challenge for spraying thick coatings from pre-alloyed powders.…”

Section: Introductionmentioning

confidence: 99%

Intermetallic Phase Evolution of Cold-Sprayed Ni-Ti Composite Coatings: Influence of As-Sprayed Chemical Composition

2020

View full text Add to dashboard Cite

Owing to low-temperature deposition conditions and high deposition rate, cold spray offers unique advantages in manufacturing a wide variety of metallic and composite coatings including metal matrix composites produced from physically blended powders. One of the challenges of producing composite coatings using cold spray is the deviation of coatings composition from the blended feedstock powder composition. This is of utmost importance as it affects the composition and phase evolution of intermetallic forming coatings during post spray heat treatment. In this work, cold spray of composite Ni - Ti coatings and formation of intermetallics from post spray heat treatment were investigated as a first step to examine the potential of producing equiatomic bulk Ni - Ti by cold spray. Three different physically blended Ni and Ti powders mixtures were sprayed on titanium substrates to address the coating composition variation from the blended feedstock powder and study its influence on phase evolution during post spray heat treatment. High-density and well-dispersed composite coatings were achieved for each case. EDS analysis revealed as-sprayed coatings with 10.5, 35.9 and 56.9 at.% Ni (and with balanced Ti ratios) from the three powder mixtures. Annealing treatments were conducted at 400, 500 and 900 °C for 1 and 2 h and comparative studies of the intermetallic compound formations were carried out. Microstructural investigation showed that all three equilibrium intermetallics phases of binary Ni - Ti phase diagram (Ni 3 Ti, Ti 2 Ni and NiTi) formed in the two Ni-rich composite coatings with NiTi phase being maximum in the coating with the closest composition to equiatomic ratio while only Ti 2 Ni phase formed in the Ti-rich coating after annealing. Thermal etching analysis of coatings showed that NiTi phase forms with a gradient microstructure from Ti splats boundary toward the center of splats, which is attributed to the grain refinement of CS samples at splat boundary and intermetallic nucleation mechanism.

show abstract

Effect of self-propagating high-temperature combustion synthesis on the deposition of NiTi coating by cold spraying using mechanical alloying Ni/Ti powder

Cited by 27 publications

References 23 publications

Utilization of mechanically alloyed powders for surface protective coating

Utilization of mechanically alloyed powders for surface protective coating

Cold Gas Spraying of Nickel-Titanium Coatings for Protection Against Cavitation

Intermetallic Phase Evolution of Cold-Sprayed Ni-Ti Composite Coatings: Influence of As-Sprayed Chemical Composition

Contact Info

Product

Resources

About