Sliding Portion Surface Treatment via Composite Particle Injection
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Solution Overview
Problem
Existing methods for surface treatment using layered-structure solid lubricants face challenges such as high wear-out rates, increased costs, pollution risks, and inability to form concavities that function as oil reservoirs, especially when using graphite, molybdenum disulfide, or tungsten disulfide, which fragment easily and reduce lubricant efficiency.
Innovation Solution
A method involving the injection of blended soft-metal solid lubricant particles and oxidized layered-structure solid lubricant particles at high speeds to form a stable wear-resistant layer with concavities on the surface, reducing fragmentation and pollution, and enhancing lubricity while allowing for efficient reuse of fragmentized particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If layered-structure solid lubricant particles (graphite, MoS2, WS2) are used as injection particles, then lubricativeness is improved, but the particles fragment easily during collision, increasing wear-out rate and cost
Solution Approach 1:
The patent uses composite injection particles comprising both layered-structure solid lubricant particles (graphite, MoS2, or WS2) and soft metal particles (Sn, Zn, Pb, or Al). This composite structure allows the layered-structure particles to provide lubricativeness while the soft metal particles absorb collision impact, reducing fragmentation of the lubricant particles and extending their service life
Solution Approach 2:
The patent optimizes the particle size ratio between layered-structure solid lubricant particles and soft metal particles, with the soft metal particles having a larger particle size (0.5-2 times) than the layered-structure particles. This parameter adjustment ensures the soft metal particles effectively cushion the collision while maintaining efficient diffusion of the lubricant particles into the sliding portion surface
2Productivity
If injection particles are reused after collection, then cost is reduced, but fragmentized particles are removed requiring adjustment of particle size
Solution Approach 1:
The patent enables effective reuse of injection particles by combining the composite structure with a recovery system that collects and re-injects particles. The soft metal component protects the layered-structure lubricant particles from excessive fragmentation, allowing them to maintain functionality after collection and reuse, thereby reducing overall consumption and cost
3Manufacturing precision
If high injection pressure is used to diffuse particles into surface, then wear resistance layer formation is improved, but collision energy is reduced when particles change flying direction
Solution Approach 1:
The soft metal particles act as intermediaries that absorb and dissipate collision impact energy. When the composite injection particles collide with the sliding portion surface, the soft metal particles deform and cushion the impact, protecting the layered-structure lubricant particles from fragmentation while still enabling effective diffusion and penetration into the surface at high injection pressures
4Reliability
If layered-structure solid lubricant particles are injected, then lubrication is achieved, but concavities for oil reservoir function are not formed
Solution Approach 1:
The composite injection particles simultaneously achieve multiple functions: the layered-structure solid lubricant particles provide lubricativeness through their layered structure, while the soft metal particles contribute to forming concavities on the sliding portion surface that function as oil reservoirs. This multi-functional approach combines lubrication with oil storage capability in a single treatment process
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
This method stabilizes the formation of wear-resistant layers with concavities acting as oil reservoirs, reduces the risk of pollution, and decreases the cost and wear-out rate of lubricants, achieving high lubricity and extended surface treatment effectiveness.
Implementation Method 1
diffusing and penetrating an oxide of the soft-metal solid lubricant and the layered-structure solid lubricant into the surface of the sliding portion
Implementation Method 2
injecting the injection particles obtained by blending the soft-metal solid lubricant particles of which the surface has been oxidized and the layered-structure solid lubricant particles onto the surface of the sliding portion at an injection speed of 150 m/sec or more
Implementation Method 3
the soft-metal solid lubricant particles of which the surface has been oxidized
Implementation Method 4
the sliding occurs between the layers when a load is applied to the layered structure, which provides the lubricativeness
Implementation Method 5
an inter-layer bond is formed by a relatively weak force. And the sliding occurs between the layers when a load is applied to the layered structure
Data Source
AI summary
There is provided a method for surface treatment of a sliding portion of a product, which is an economical method, has less risk of polluting the working environment, or causing a fire by the powder dust, and yet enables high lubricativeness to be achieved, and many concavities to be formed on the sliding portion while simultaneously providing lubricativeness. Injection particles, obtained by blending soft-metal solid lubricant particles the surfaces of which have been oxidized and layered-structure solid lubricant particles, are injected onto a surface of the sliding portion of the product to be treated at an injection speed of 150 m/sec or more, thereby to diffuse and penetrate the surface to form a layer of the injection particles, and to form many concavities on the surface of the sliding portion.