Study of laser cladding Fe–Co duplex coating on copper substrate

Abstract

Fe-Co duplex coating has been successfully deposited onto pure copper surface by Nd:YAG laser cladding. The morphology and microstructure were investigated by optical microscopy (OM), scanning electron microscopy (SEM) and x-ray diffraction (XRD). Mechanical properties of the samples have been evaluated by microhardness measurement and wear properties. Experimental results showed that the coating was free of cracks and voids, and good metallurgical bonded to the substrates. The surface of the Fe-Co duplex coating was mainly composed of α-Co solid solution, CoC x , Fe 0.64 Ni 0.36 and a number of carbides. The microhardness of the Co-based coating reached 438.6 HV 0.2 , which was about 5 times of Cu substrate (90.5 HV 0.2 ). The wear test showed the average wear rate of Fe-Co duplex coating was 19.8% of that of copper matrix. The hardness and wear resistance of the Fe-Co duplex coating was significantly improved.

Study on sintering properties of aluminum oxide nano-powder for electronics packaging

“…General aluminum oxide ceramics have attracted much research due to their non-oxidizability, corrosion-resistant, antiwear, and high-temperature resistance. However, the wide application of aluminum oxide ceramics has been limited due to their sintering temperature (above 1700 ℃), low toughness, and high brittleness, making it difficult for industrial production [1][2][3] . The quality of ceramic products of the micro powder depends on the grain fineness directly.…”

Microstructure and Properties of Nickel-Based Gradient Coatings Prepared Using Cold Spraying Combined with Laser Cladding Methods

“…These advantages result in the efficient preposition of the nickel-based intermediate layer without affecting the organization and performance of the Cu substrate. Although cold spraying or laser cladding has been used to prepare nickel-based coatings on copper-based surfaces, the combination of the cold spraying pre-deposition with laser cladding has not been used for the preparation of nickel-based gradient wear-resistant coatings [ 14 , 27 , 28 , 29 , 30 , 31 ].…”