DLC/WC-12Co溶射複合皮膜を有するマグネシウム合金AZ80Aの疲労挙動

概要

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WC-12Co was thermally sprayed by a high velocity oxy-fuel (HVOF) method on AZ80A magnesium (Mg) alloy as an interlayer, and then diamond-like carbon (DLC) film was deposited in order to fabricate DLC/WC-12Co hybrid coating. The thicknesses of WC-12Co interlayer were 15, 50 and 80μm and those of DLC film were 3 and 15μm. Rotating bending fatigue tests were conducted in laboratory air and the effect of hybrid coating on fatigue behavior was discussed. Thin hybrid coating (15μm WC-12Co+3μm DLC) was detrimental to fatigue strength because thin coating could not suppress the crack initiation from the small notches introduced during thermal spraying process, while thick hybrid coating (80μm WC-12Co+15μm DLC) could improve fatigue strength. Thick interlayer acted effectively for bearing fatigue loading and thick DLC film could successfully suppress crackings in the brittle interlayer, resulting in the higher fatigue strength than the substrate.
2010-04-25