Abstract
Synthesis of Vanadium Interface for HFCVD Diamond Deposition on Steel Surface
Highlights
The main problems to grow CVD diamond films directly on steel surface concern adhesion, crystallinity and purity
Available (99% pure) Vanadium carbide (VC) powder bought from Chengdu Best New Materials was the interface precursor
The VC powders dispersed in isopropyl alcohol were sprayed on the samples surface using a spray gun
Summary
The main problems to grow CVD diamond films directly on steel surface concern adhesion, crystallinity and purity. The difference between the thermal expansion coefficients of diamond and steel, about 11 times, results in residual compressive stress in the diamond film. Films usually delaminate during cooling from deposition temperature. Transition metals, as iron, on steel surface, catalyze graphitic sp[2] bonds instead of diamond sp[3] bonds and reduces film quality[1]. High carbon diffusion into steel is an issue. An intermediate layer is necessary to create a transition zone to relieve the residual thermal stress and to act as a diffusion barrier both for transition metals and for carbon
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