Fabrication of TiC reinforced Ni based coating by laser cladding

Abstract

TiC reinforced Ni based coating on Ti-6Al-4V was produced by laser cladding using colloidal graphite powder and pure nickel powder. The microstructure was characterised by SEM, energy dispersive spectroscopy and X-ray diffraction. Microhardness and dry sliding wear properties were investigated, and the results showed that diffusion of the substrate atoms had caused significant in situ growth of TiC and solid solution strengthening in the coating. TiC was polyhedron and petaline shaped. After laser cladding, the microhardness profile presented novel changes with depth in the coating. The TiC reinforced Ni based coating had good wear resistance on ball on disc dry sliding wear testing. Abrasive wear was the main mechanism.

Microstructure Evolution of TiC Particles In Situ, Synthesized by Laser Cladding

“…Bandyopadhyay et al determined the isothermal sections to be at 900, 1070, 1260 and 1700 °C [ 28 ]. According to the above analysis and the latest binary data about the Ni-Ti-C system [ 29 ], the microstructure of the coatings in this research should have been the TiC 1-x + Ni 3 Ti + NiTi.…”

“…The experimental design was based on a previous study [ 28 ]. The mixing powder was preplaced evenly on the clean surface of the substrate at a thickness of approximately 1.2 mm.…”

Laser cladding nickel‐titanium carbide composite coating on a 45 carbon steel: Preparation, microstructure and wear behavior

“…Titanium carbide with extremely high hardness (2400 HV 3 -3000 HV 3), high melting point (3420 K), high modulus (420 GPa) and low density (4.95 g/cm 3 ) has gained increasing research atten-tion [1][2][3]. It has widely served as reinforcement for metal matrix composites or composite coatings on the metal surface for the improvement of the mechanical properties and wear resistance [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Among those metal matrix composites s or coatings, nickel based metal matrix composites loaded 49 50 with titanium carbide as reinforcement have gained extensive research interests because of their combined metallic properties (ductility and toughness) and ceramic characteristic (high strength and modulus) leading to greater strength in shear and compression and wear resistance.…”

“…[11][12][13][14][15][16][17][18][19][20]. Various coating methods such as laser deposition or laser cladding, tungsten inert gas (TIG) cladding, electrodeposition, high velocity oxy-fuel spraying (HVOF), flame spraying, electroexplosive spraying, self-propagating high-temperature synthesis (SPHTS), electro-thermal explosion ultra-high speed spraying were applied in deposition process [11][12][13][14][15][16][17][18][19][20]. Among those coating technologies, laser cladding process has been considered as an efficient and cost-effective coating technique and widely applied to fabricate metal matrix composites including nickel-titanium carbide composite coatings [23].…”

“…Among those coating technologies, laser cladding process has been considered as an efficient and cost-effective coating technique and widely applied to fabricate metal matrix composites including nickel-titanium carbide composite coatings [23]. However, the previous research work on producing nickel-titanium carbide composite coatings by laser cladding was concentrated on in situ formation of nickel-titanium carbide in the nickel matrix by using powder mix-ture of nickel, titanium and carbon as starting materials [13,19]. Consequently, the titanium carbide content in the nickel matrix was limited to about 5 vol.% -20 vol.%.…”