Quaternary Layered Boride Ti₄MoSiB₂: A Structure-Function Integrated High-Temperature Self-Lubricating and...

Area of Science:

• Materials Science
• Tribology
• Solid-state Chemistry

Background:

• Quaternary layered borides are emerging materials with potential for structural-functional integration.
• Systematic studies on their high-temperature lubrication properties are scarce.

Purpose of the Study:

• To synthesize and characterize a novel Ti4MoSiB2 MAB phase material.
• To investigate its mechanical and tribological behavior across a wide temperature range.
• To elucidate the mechanisms governing its high-temperature performance.

Main Methods:

• Synthesis of Ti4MoSiB2 MAB phase material.
• Mechanical property testing from room temperature to 1273 K.
• Tribological testing and analysis of friction and wear mechanisms.
• Computational calculations for failure and property analysis.

Main Results:

• The synthesized Ti4MoSiB2 material retains desirable mechanical properties up to 1273 K.
• Excellent lubricating and wear resistance performance was observed at high temperatures.
• Anisotropic thermal expansion, tribochemical reactions, and oxygen vacancies were identified as key factors influencing performance.

Conclusions:

• Ti4MoSiB2 MAB phase material demonstrates significant potential for high-temperature applications.
• Understanding the underlying mechanisms provides a basis for future material design and optimization.
• This research lays the groundwork for practical utilization in demanding thermal environments.