화학기상 증착된 흑연이 흑연/금속 이중층 박막의 기계적 강도에 미치는 영향에 관한 연구

Effect of Chemical Vapor Deposition of Graphite on the Mechanical Strength of a Graphite/Metal Bilayer Film

A graphite/metal bilayer film was fabricated by depositing a graphite film with a thickness of hundreds of nanometers on Ni foil using chemical vapor deposition. The thickness of the graphite film was controlled by varying the feeding gas mixture of the hydrocarbon and hydrogen while maintaining the growth temperature at ~1000°C. The mechanical properties of the graphite/Ni foil bilayer film were measured by micro Vickers hardness and nanoindentation tests to investigate the effect of the graphite film on the mechanical properties of the underlying Ni foil. The experimental results showed that the hardness and Young s modulus of the graphite/Ni bilayer film increased significantly compared to those of the Ni foil. However, the difference in the thickness of the graphite film slightly affected the mechanical properties of the graphite/Ni bilayer, although a thicker graphite film resulted in lower Young s modulus and hardness. This study shows that coating a very thin graphite film (thickness of hundreds of nanometers) on a metal significantly improves the metallic plasticity, confirming that it is possible to produce graphite/metal composites with excellent mechanical properties.