Evaluation of interfacial stability and strength of cermets based on work function

Area of Science:

• Materials Science
• Surface Science
• Computational Materials Science

Background:

• Interfacial stability and strength are critical for ceramic-metal composites (cermets).
• Existing methods for evaluating cermet interfaces can be limited in resolution or scope.
• Understanding interfacial properties is key to designing advanced materials.

Purpose of the Study:

• To propose and validate a novel method for analyzing interfacial stability and strength in cermets.
• To correlate interfacial work function gradients with bonding characteristics.
• To provide a new tool for evaluating cermet interfacial properties.

Main Methods:

• Experimental evaluation of interfacial work function gradient and elastic modulus using WC-Co and TiC-Co.
• High-resolution surface analysis with a spatial resolution down to 10 nm.
• First-principles calculations to investigate electronic configurations and interface energy.

Main Results:

• A gradually changing interfacial work function signifies a stable and strongly bonded interface.
• A steep work function change across the interface indicates weak bonding.
• Smaller interfacial work function gradients correlate with lower interface energy and stronger bonds.
• Experimental and theoretical results confirm the work function gradient as a measure of interfacial interactions.

Conclusions:

• The interfacial work function gradient is an effective indicator of interfacial stability and bonding strength in cermets.
• The proposed method offers high sensitivity and resolution for interfacial analysis.
• This work provides a new approach for evaluating and optimizing cermet performance.