Microstructural, Electrical, and Tribomechanical Properties of Mo-W-C Nanocomposite Films

Area of Science:

• Materials Science
• Nanotechnology
• Thin Film Deposition

Background:

• Nanocomposite films offer tunable properties for advanced applications.
• Understanding the structure-property relationships in Mo-W-C films is crucial for optimizing their performance.

Purpose of the Study:

• To investigate the phase composition and microstructure of Mo-W-C nanocomposite films.
• To determine how these structural characteristics influence the electrical and tribomechanical properties.
• To assess the suitability of these films for micromechanical devices and power electronics.

Main Methods:

• Dual-source magnetron sputtering for film deposition.
• Analysis of phase composition and microstructure.
• Electrical and tribomechanical property testing.

Main Results:

• Films exhibit nanograins (β-(Mo2+W2)C or a mix of β- and α-(Mo+W)C phases) in an amorphous carbon matrix.
• Hopping conductivity observed, with relaxation time doubling in double-phase structures.
• Tunnelling conductance achieved without thermal activation.
• Optimal hardness (19-22 GPa) and low friction (0.15-0.24) in films with mixed phases.

Conclusions:

• The phase composition and microstructure of Mo-W-C films significantly impact their electrical and tribomechanical behavior.
• A dual-phase nanostructure enhances electrical conductivity and tribomechanical performance.
• Mo-W-C nanocomposite films are promising for applications in micromechanical devices and power electronics.