Electric arc deposition of carbon steel coatings with improved mechanical properties

Abstract

Carbon steel coatings can be employed for hardfacing mechanical components used in moderately aggressive wear environments, provided they are sufficiently hardened by retained carbon. However, when thermal spraying using compressed air as the atomising gas, properties of carbon steel coatings are degraded by carbon loss through oxidation and oxide inclusions. It is shown that the physical and mechanical properties of these coatings can be greatly improved by spraying with inexpensive nitrogen produced on site by pressure swing adsorption or membrane separation, without the cost penalties incurred when using pure nitrogen. In some circumstances, such coatings can be used to replace more expensive alloy hardfacing layers.

Spatially resolved nanoscale chemical and mechanical characterization of ZDDP antiwear films on aluminum?silicon alloys under cylinder/bore wear conditions

“…This engine was a die cast hyper-eutectic aluminum-silicon alloy 390 (16)(17)(18) in which the walls of the cylinder bores were electrochemically etched to expose primary silicon particles on the surface [1][2][3]. Other technologies currently being investigated include iron coatings [4][5][6] thermally sprayed on the aluminum bore walls. The trends and demands on the automobile manufacturing industry indicate the need to return to such weight saving technology.…”

Cryogenic Treatment for Enhancing the Wear Resistance of Tool in Screw Briquetting Process

“…To reduce the level of wear affecting components Zurecki and others had coated with carbon steel and applying nitrogen by sparying (Z. Zurecki, D. Garg& D. Bowe, 1996). Thin films of ZrN coated in different thicknesses on 316 stainless steel and the corrosion resistance and wear resistance could be varied by changing the thickness of the films (J Menghani et al 2013).…”