Effect Of Interlayer Thickness On Fatigue
Behavior In A5052 Aluminum Alloy With
DLC/thermally Sprayed WC-12Co Hybrid
Coatings
Author(s)
Y. Uematsu, T. Kakiuchi, T. Teratani, Y. Kobayashi,
Y. Harada & M. Takekawa
Abstract
Tungsten carbide with 12% cobalt (WC-12Co) was thermally sprayed by a high
velocity oxygen fuel (HVOF) method on A5052 aluminum alloy as an interlayer
with the thicknesses of 25, 70 and 120 m and subsequently diamond-like
carbon (DLC) was deposited with the thickness of 15 m to fabricate DLC/WC-
12Co hybrid coating. Rotary bending fatigue tests were conducted using the
specimens with DLC/WC-12Co hybrid coating and the thickness effect of
interlayer on fatigue behavior was investigated. The fatigue strengths of the
specimens with WC-12Co single layer were higher than those of the substrate.
The fatigue strengths increased with increasing the thickness of WC-12Co layer.
The specimens with hybrid coating exhibited higher fatigue strengths than the
specimens with WC-12Co single layer when the thickness of WC-12Co layer
was the same. The thinnest WC-12Co interlayer led to the mostly improved
fatigue strengths by hybrid coating system. In the specimens with hybrid coating,
DLC film could suppress the micro-cracking of WC-12Co interlayer, and thus
the fatigue strengths were improved. When the interlayer became thicker, the
effect of thin DLC film became weaker and resulted in the lower improvement of
fatigue strengths.
Keywords: fatigue, DLC, thermal spray, hybrid coating, crack initiation.
Keywords
Keywords: fatigue, DLC, thermal spray, hybrid coating, crack initiation.
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