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Laser cladding composite coating on mild steel using Ni–Cr–Ti–B <sub/>4</sub> C powder
摘要： 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 Ni3Ti, Cr2Ti, Ni–Cr–Fe, TiB2 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.
关键词： laser cladding,wear resistance,microstructure,Q235 mild steel,Composite coating
更新于2025-09-10 09:29:36
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Investigation of reinforced performance of modified graphene oxide/high solid content polysiloxane nanocomposite coating films
摘要： Graphene oxide was modi?ed using long-chain silicone. The modi?ed graphene oxide (MGO) was obtained with a broader spacing of layers (1.45 nm) which means more bene?cial to polysiloxane entering into the laminates of MGO sheets. Then, MGO sheets were combined with polysiloxane which synthesized without any organic solvent to prepare nanocomposite coatings via cross-linking curing reaction. The solid content of polysiloxane can be reached up to 86%. Due to strong interfacial interaction and synergistic reinforcing between MGO sheets and polysiloxane, when blended with 1.00 wt% of MGO, the micro-hardness and elastic modulus of coating ?lms were increased by 57% and 24% comparing with pure polysiloxane coating ?lm, respectively. Subsequently, a 48% improvement of macro-scratch resistance can be achieved. Simultaneously, MGO/polysiloxane coating ?lm showed excellent wear resistance due to the unique two-dimensional geometry and low frictional coef?cient of MGO sheets at work in homogeneous dispersion system.
关键词： Polysiloxane,Scratch resistance,Wear resistance,Nanocomposite coatings,Graphene oxide
更新于2025-09-09 09:28:46