Ultrastrong Carbon Thin Films from Diamond to Graphene under Extreme Conditions: Probing Atomic-Scale Interfacial Mechanisms to Achieve Ultralow Friction and Wear
Abstract
The fundamental understanding of interface behaviour is the key to the utilization of nano-materials and to the design of material systems contained nano-materials. This proposed research is a concerted team effort to understand how to achieve low and long-lasting steady-state friction and wear of materials systems made of nano-materials or nano/bulk-materials. To do that, developing a scientific understanding of the atomic-scale mechanisms governing adhesion, friction, and wear of diamond and graphene interfaces under extreme conditions is necessary. The proposed research addresses this challenge through a combined experimental-computational approach, specifically focusing on the role that defects play in these processes. A substantial portion of the work will involve using the in-situ nanotribometry method that both PI’s collaboratively developed under prior joint AFOSR support, and by performing multiscale simulations of sliding to connect atomistic processes with overall behaviour. In-situ tools allow us to visualize atomic-level processes occurring in sliding contacts through real time, real space, high resolution transmission electron microscopy (TEM) measurements of a contact formed in a nanotribometer where contact forces are precisely measured and controlled. Ex-situ nanoscale adhesion and sliding contact experiments will be carried out using AFM, where a tip can be slid over large areas of a substrate, and adhesion, friction, and wear behavior can be measured and correlated with structural defects and sliding conditions. Multiscale modelling of carbon-based coatings will be used to understand how the mechanical properties depend on the structure, and subsequently how these properties and surface morphology and sliding conditions affect the tribological performances.We will focus on several carbon-based materials: ultrananocrystalline diamond (UNCD), diamond-like-carbon (DLC) and graphene.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 09, 2018
- Source ID
- FA23861714002
Entities
People
- Reau-ren Jeng
Organizations
- Air Force Office of Scientific Research
- National Chung Cheng University
- United States Air Force