In-Situ TiB 2 –TiC–Al 2 O 3 Composite Coating on Aluminum by Laser Surface Modification

The Ti6Al4V is widely used in harsh working conditions where wear and tear are the common phenomena. In order to enhance its performance and life, the laser cladding took place using Ti6Al4V:WS 2 : Ni as the reinforcement material. The influence of scanning speed on mechanical and tribological properties like hardness, wear resistance, and microstructure of the cladding parts is discussed. The dendritic, white, and grey phased fine microstructures are observed. The micro-hardness of the clad is increased up to four times (∼1170 HV 0.5 ) of the substrate material due to the formation of a hard Ni-Ti phase. The wear resistance of the clad is exhibited two times higher than that of the substrate. Also, the coefficient of friction is reduced to 0.25 as the adhesion wear mechanism becomes predominant over the abrasion.

Section: Introductionmentioning

confidence: 99%

Ni–WS₂–Ti–6Al–4V self-lubricating coating on TC4 alloy by laser cladding

Kumar

Mandal

et al. 2022

“…Ceramic reinforced metal matrix composites (MMCs) are the most favourable material systems used in laser alloying on aluminium alloys. First, ceramics such as carbides, oxides and borides can provide high hardness and excellent wear resistance [10]. During the laser process, ceramics with a high melting point can stay in the coatings as original particles, remaining their superior properties.…”

Section: Introductionmentioning

confidence: 99%

Laser alloying with Fe–B₄C–Ti on AA6061 for improved wear resistance

Chi

Meng

Dou

et al. 2021

“…The coating, reinforced by TiC and TiB 2 , obtained high hardness which was about 4-5 times the substrate. Sahu et al [17] utilised laser process to manufacture TiB 2 -TiC-Al 2 O 3 composite coating. The micro-hardness of coating was visibly higher than that of substrate.…”

Section: Introductionmentioning

confidence: 99%

Laser cladding composite coating on mild steel using Ni–Cr–Ti–B₄C powder

Han

Xiao²,

Zhang³

et al. 2018

The composite coating was fabricated by laser cladding on Q235 mild steel. The cross-section morphology, microstructure, phase, micro-hardness and wear resistance of the coating were investigated by scanning electron microscope, energy dispersive spectrometry, X-ray diffraction, Vickers micro-hardness tester and dry sliding wear testing machine, respectively. Results showed that composite coating was gained without cracks and bonded with substrate excellently because of the prominent metallurgical bonding. The composite coating was made up of Ni 3 Ti, Cr 2 Ti, Ni-Cr-Fe, TiB 2 and TiC. Ceramic reinforcements existed in coating with eutectic and independent structures. The micro-hardness of coating was about 5 times the substrate. Compared with substrate, the coating showed superior wear resistance.