Microstructure and Wear Resistance of ZrC-ZrB2 /Ni Composite Coatings Prepared by Plasma Transferred Arc Cladding

Abstract

The ZrC-ZrB 2 /Ni metal matrix composite coatings were in-situ synthesized from a mixture of Ni, Zr and B 4 C by plasma transferred arc (PTA) cladding process. Microstructures and phase constituents of the coatings were characterized by electron probe micro-analyzer (EPMA) and X-ray diffraction (XRD). Microhardness and wear resistance of the coatings were systematically investigated by means of vickers hardness tester and wear tester. The results showed that the main phases of the composite coatings were ZrB 2 and ZrC. The coatings had a sound metallurgical bonding to the SA-283C steel substrate. Microhardness and wear resistance of the substrate were greatly improved by the composite coatings, and both of them showed a tendency to increase first and then decrease with the increase of the Ni content. As the content of Ni was 30 wt.%, the hardness of the coating reached the maximum value, 1522 HV, and the wear resistance was about 15 times that of the substrate.

Kinetic role of C/Zr ratio in the reaction process, combustion behavior, and synthetic product of 70 wt.% (xC–Zr)–30 wt.% Cu

“…Among various preparation methods, the combustion synthesis technology has attracted much attention for its easy operation and low energy consumption 14–16 . In addition, the combustion synthesis has been widely used to combine with other routes to prepare composites containing ZrC 17–30 . As these ceramic particles are mainly derived from the combustion synthesis reaction, understanding the kinetic characteristics is vital to achieving a desired microstructure.…”

Development and Evaluation of the Internal Cladding Process of API 5L X70 Risers with Nickel-based superalloy 625 via PTA Welding

“…Among the welding processes used to carry out the internal cladding of the risers, the Plasma Transferred Arc (PTA) process stands out, being widely used in API 5L X70 cladding applications with Ni-alloys [13] in many industrial areas including chemical processing, nuclear power plants, marine engineering and oil and gas industry, mainly involving corrosion and/or heat resistance [14][15][16][17]. The PTA process is characterized by a high metallurgical quality due to a greater microstructural refining [18][19][20], to the versatility of developing new alloys due to the flexibility of manipulating the chemical composition by mixing powders [21,22] and making composite cladding in which there is a ductile metal matrix and a high hardness material [23][24][25]. Besides these, the PTA process has as operational benefits the smoothness of the deposition of powder without causing oscillation in the melting pool, absence of spatters, independence between heat input and material deposition rate, besides the coaxiality of the powder injection, allowing a high control of the melting pool and the geometry and finish of the cladding [26,27].…”

Effect of Plasma Cladding Speed on the Microstructure and Properties of ZrC-ZrB2/NiAl Coating

“…Metal-matrix composite (MMC) coatings have excellent properties, such as specific stiffness, good thermal conductivity and good corrosion resistance, high modulus, stability at high temperature and wear resistance [2][3][4] . They are comprehensive applied as promising candidates of advanced materials.…”

“…Plasma cladding process is widely used to many industrial aspects because of high heating, good controllability and low cost 4,18,19 . At present, there are relatively few studies on the effect of scanning speed on the properties and microstructure of coatings by plasma cladding.…”