Shark Skin-Inspired Low-Friction Coating via Composite Particle Stacking
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Solution Overview
Problem
Current low-friction technologies, such as laser surface texturing, fail to achieve sufficient low-friction effects in engine parts, and attempts to replicate natural structures like shark skin for improved friction reduction are hindered by technical difficulties in structural analysis and manufacturing.
Innovation Solution
A low-friction member is created by stacking composite particles with spherical metal lubricating particles on plate-shaped particles, forming a structure similar to shark skin, using a substrate with a Ni—SiC plating layer and dimples, and applying ultrasonic waves or ultraviolet irradiation for coating and bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser surface texturing is used to create dimples on engine parts, then the lubrication effect is improved and friction is reduced, but the low-friction effect is insufficient and wear resistance is not adequately enhanced
Solution Approach 1:
The patent uses composite particles consisting of plate-shaped particles (providing structural framework) and spherical particles (providing lubrication) combined in a specific configuration. This composite structure achieves superior low-friction and wear-resistant properties compared to single-material solutions, directly addressing the insufficient low-friction effect of conventional laser texturing.
Solution Approach 2:
The coating layer is segmented into multiple types of particles with different functions: plate-shaped particles form the structural framework while spherical particles provide lubrication. This segmentation allows each particle type to optimize its specific function, achieving comprehensive performance improvement that neither particle type could achieve alone.
2Reliability
If shark skin structure is replicated to reduce friction, then low-friction characteristics are improved, but technical difficulties in structural analysis and manufacturing prevent successful implementation
Solution Approach 1:
The patent copies the essential functional feature of shark skin (the riblet structure formed by stacked scales) and translates it into a manufacturable form using plate-shaped and spherical particles. Rather than attempting to replicate the complex biological structure directly, the invention captures the key functional aspect through a simplified particle-based approach that is easier to manufacture.
Solution Approach 2:
The invention changes the parameters of the coating structure by using specific particle shapes (plate-shaped and spherical) and specific size ratios (spherical particles having 1/10 to 1/5 the diameter of plate-shaped particles). These parameter changes enable the structure to achieve shark skin-like low-friction characteristics while being compatible with conventional manufacturing processes.
3Reliability
If surface irregularities are formed to store lubricant and prevent leakage, then frictional characteristics are improved, but abrasive particles accumulate and cause additional wear
Solution Approach 1:
The patent applies local quality by using spherical particles specifically positioned within the plate-shaped particle structure to trap and neutralize abrasive particles. The spherical particles act as local traps that capture abrasive particles before they can cause damage, while the plate-shaped particles provide the overall structural framework. This localized function assignment solves the problem of abrasive particle accumulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting low-friction member exhibits excellent friction reduction characteristics, suitable for applications in engine parts, by enhancing the lubricating effect and improving wear resistance through a structure that mimics shark skin's riblet pattern.
Implementation Method 1
applying ultrasonic waves or ultraviolet irradiation for coating and bonding
Implementation Method 2
applying ultrasonic waves or ultraviolet irradiation for coating and bonding
Implementation Method 3
multiple spherical metal lubricating particles having a smaller nano size than the plate-shaped particles and coated on the surfaces of the plate-shaped particles
Data Source
AI summary
The present invention relates to a low-friction member imitating shark skin and a manufacturing method therefor, the low-friction member implementing a structure similar to shark skin and having riblets by stacking, in layers, composite particles formed by attaching spherical particles on the surfaces of plate-shaped particles, and thus the low-friction member has excellent low-friction characteristics. The present invention comprises: a base plate; plate-shaped particles stacked in layers on the surface of the base plate in the form of scales; and a plurality of spherical metal lubricating particles having a size smaller than that of the plate-shaped particles, and coated on the surfaces of the plate-shaped particles, wherein the metal lubricating particles are arranged in the form of a bridge connecting the base plate and the plate-shaped particles, and the plate-shaped particles to each other.