Morphology, Structure, Microhardness and Corrosion Resistance of Ni-W Coating Annealed in Hydrogen and Argon Atmosphere

Microhardness Improvement of Ni-W/SiC Composite Coatings by High Frequency Induction Heat Treatment

“…At ∼500°C, Ni-W alloys reaches the maximum microhardness of 1293 HV for Ni-61.2 wt% W, 4 1005 HV for Ni-21 at% W, 5 1151 HV for Ni-20.7 wt% W 6 and 1168 HV for Ni-21.3 at% W annealed in argon atmosphere. 7 The other method to increase microhardness is increasing the W content in Ni-W alloys, and the results have been reviewed and plotted by Vamsi et al, whose data pointed out that the microhardness of as-deposited Ni-W alloys increased from 4.5 GPa (∼ 422 HV) to 9.2 GPa (∼ 863 HV) when increasing the W content from 3 to 17 at%. 8 Similar results were also obtained by Hou et al, who enhanced the microhardness of as-deposited Ni-W alloys to 823 HV through increasing the W content to 61.2 wt%.…”