Nanodiamond PTFE Lubricating Layer for Compressor Wear Resistance

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Solution Overview

Problem

Existing surface treating agents, such as PTFE, face challenges in achieving both high wear-resistance and uniform material properties due to the difficulty in dispersing nanodiamond and carbon nanotube powders, which affects the mechanical strength and friction coefficient of lubricating layers in compressors.

Innovation Solution

A surface treating agent is developed by dispersing nanodiamond powder and carbon nanotube powder in an organic solvent with a dispersing agent, followed by mixing with a PTFE solution, using attrition milling and ultrasonic dispersion to achieve even distribution, resulting in a lubricating layer with enhanced wear-resistance and mechanical properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If nanodiamond powder and carbon nanotube powder are added to PTFE material to increase mechanical strength, then wear-resistance is improved, but the coefficient of friction increases drastically

Engineering Contradiction:

Improvemechanical strengthVSAvoidcoefficient of friction

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent controls the total weight of nanodiamond powder and carbon nanotube powder to be 0.1 to 5% by weight of the PTFE solution, and optimizes their mixing ratio to 4:6 to 6:4. This parameter optimization ensures that the mechanical strength is enhanced while the coefficient of friction increase is minimized, resolving the contradiction between strength improvement and friction control

Inventive Principle:

Principle #35Parameter changes

2Strength

If nanodiamond powder and carbon nanotube powder are mixed into PTFE material to enhance wear-resistance, then the lubricating layer intensity is improved, but uniform material properties are difficult to achieve due to poor dispersion

Engineering Contradiction:

Improvelubricating layer intensityVSAvoiduniform material properties

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The patent uses an amide-based organic solvent (such as N,N-dimethylformamide or N-methyl-2-pyrrolidone) as an intermediary medium to disperse nanodiamond powder and carbon nanotube powder before mixing with PTFE solution. This solvent acts as a mediator that facilitates uniform distribution of the additives, ensuring stable and uniform material properties while maintaining enhanced lubricating layer intensity

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent specifies precise parameter ranges: the total weight of nanodiamond powder and carbon nanotube powder is controlled at 0.1 to 5% by weight of the PTFE solution, with a mixing ratio of 4:6 to 6:4. These parameter optimizations ensure both uniform dispersion and enhanced mechanical properties

Inventive Principle:

Principle #35Parameter changes

3Strength

If PTFE is mixed with a large quantity of glass fibers or carbon fibers to intensify mechanical strength, then the mechanical strength is improved, but the coefficient of friction increases and the use of PTFE is limited

Engineering Contradiction:

Improvemechanical strengthVSAvoidusability of PTFE

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The patent reduces the total weight of nanodiamond powder and carbon nanotube powder to 0.1 to 5% by weight of the PTFE solution, which is a significantly lower quantity compared to traditional glass fiber or carbon fiber additions. This parameter optimization achieves mechanical strength enhancement while maintaining low friction characteristics and broad applicability of PTFE

Inventive Principle:

Principle #35Parameter changes

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 solution enhances the wear-resistance and lifespan of the lubricating layer by leveraging the high hardness and strength of nanodiamonds and carbon nanotubes, while ensuring even dispersion, thus improving the friction coefficient and mechanical properties, and allows for a more compact compressor design by eliminating the need for bearings.

Implementation Method 1

using attrition milling and ultrasonic dispersion to achieve even distribution

Methodology Applied

Scientific EffectAttrition milling:

Implementation Method 2

using attrition milling and ultrasonic dispersion to achieve even distribution

Methodology Applied

Scientific EffectUltrasonic dispersion: Ultrasonic Vibration

Implementation Method 3

dispersing nanodiamond powder and carbon nanotube powder in an organic solvent with a dispersing agent

Methodology Applied

Scientific EffectDispersion: Dispersion (of waves)

Implementation Method 4

followed by mixing with a PTFE solution

Methodology Applied

Scientific EffectMixing:

Data Source

PatentUS9341185B2Surface treating agent for wear-resistance surface, manufacturing method thereof and compressor using the same

Publication Date: 2016.05.17 LG ELECTRONICS INC

AI summary

The present disclosure relates to a wear-resistant surface treating agent, a manufacturing method thereof, and a compressor using the same. According to one aspect of the present disclosure, the surface treating agent includes an organic solvent, nanodiamond powder and carbon nanotube powder dispersed in the organic solvent, and a PTFE solution mixed with the organic solvent, wherein the organic solvent is an amide-based organic solvent.