Method of Obtaining Friction Coefficient Between Heterogeneous Materials Using Graphene Membrane Ball Probe

Abstract

The invention provides a method for obtaining friction coefficient between dissimilar materials by using a graphene film ball probe. The method comprises the following steps: providing a graphene film ball probe which comprises a cantilever and a needle tip, wherein the needle tip includes a spherical substrate and a graphene layer; providing a substrate, wherein the surface of the substrate is provided with a heterogeneous material layer; allowing the graphene film ball probe to contact the heterogeneous material layer, applying an initial load to the needle tip, under the action of the initial load, rubbing the needle tip on the surface of the heterogeneous material layer to obtain a first group of voltage signal of needle tip lateral torsion, in addition, obtaining a first interlayer friction force between the graphene layer and the heterogeneous material layer through the first group of voltage signals; changing the size of the load to obtain a second group of voltage signal, and obtaining a second interlayer friction force through the second group of voltage signals, and so on, by changing the size of the load again, obtaining the curve of N group of interlayer friction force changing with the load, and obtaining the friction coefficient between the graphene layer and the heterogeneous material layer through the slope of the curve.

Description

technical field [0001] The invention relates to a method for obtaining friction coefficients between heterogeneous materials by using a graphene membrane ball probe used in an atomic force microscope. Background technique [0002] Friction between surfaces and interfaces of moving parts generally causes wear and even component failure. The wear of mechanical parts and the energy lost by friction highlight the practical significance of friction lubrication. Due to its own limitations, liquid lubricating materials are prone to failure in harsh environments such as low speed and extreme pressure. The introduction of solid lubrication breaks through the limit of oil film lubrication, and shows great advantages in extreme occasions such as space. For micro-electromechanical (MEMS) systems manufactured with ultra-precision, due to the reduction in size, the gap between friction pairs is usually at the nanometer level. application. [0003] The exploration of nanotribology is m...

AI Technical Summary

Problems solved by technology

However, because the ordinary AFM needle tip is easy to wear in the contact mode, resulting in a small force measurement error, it is impossible to accurately obtain the friction coefficient between materials, and it is impossible to obtain a super-slip state between heterogeneous materials (friction coefficient is less than 0.01)

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