Comparative Study on the Densification, Microstructure and Properties of WC-10(Ni, Ni/Co) Cemented Carbides Using Electroless Plated and Coprecipitated Powders

Abstract

More and more attention is being paid to the influence of powder mixing on the mechanical properties and corrosion resistance of WC-based cemented carbides. In this study, WC was mixed with Ni and Ni/Co, respectively, by chemical plating and co-precipitated-hydrogen reduction, which are labelled as WC-NiEP, WC-Ni/CoEP, WC-NiCP and WC-Ni/CoCP, respectively. After being densified in a vacuum, the density and grain size of CP were denser and finer than those of EP were. Simultaneously, the better mechanical properties of flexural strength (1110 MPa) and impact toughness (33 kJ/m2) were obtained by WC-Ni/CoCP due to the uniform distribution of WC and binding phase and solid solution enhancement of the Ni-Co alloy. In addition, the lowest self-corrosion current density of 8.17 × 10−7 A·cm−2, a self-corrosion potential of −0.25 V and the biggest corrosion resistance of 1.26 × 105 Ω in 3.5 wt % NaCl solution were obtained by WC-NiEP because of the presence of the Ni-Co-P alloy.

Backpropagation in hyperbolic chaos via adjoint shadowing

“…The adjoint theory and algorithm for the unstable contribution of discrete-time systems are in [45,48]. The theory of continuous-time case uses the adjoint shadowing lemma in continuous-time [66].…”

Optimization of Plating Process on Inner Wall of Metal Pipe and Research on Coating Performance

“…Electro-brush plating has been widely used in the preparation of coatings due to these advantages [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. In addition, due to the excellent corrosion resistance, oxidation resistance in room temperature air, and no reaction with concentrated nitric acid, nickel has been widely used in electro-brush plating protection, repair, and remanufacturing technologies [ 28 , 29 , 30 , 31 , 32 , 33 ]. Nickel-based metals are well suited to the requirements of this study for the protection and performance enhancement of the inner pipe wall.…”