Polyimide Sliding Bearing Reinforced with Bismuth Vanadate
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Solution Overview
Problem
Existing polymer layers in plain bearings lack sufficient strength for highly loaded applications, particularly in large bearings like those used in trucks, where they experience increased wear and a higher tendency to breakage.
Innovation Solution
Incorporating bismuth vanadate or chromium-antimony-rutile metal oxide particles into a polyimide or polyamide-imide polymer layer, with specific weight proportions and potential admixtures, to enhance the polymer matrix's strength and tribological properties, allowing for improved wear resistance and load capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If typical hard particles such as ceramic particles (e.g., Al2O3) are added to strengthen the polymer matrix, then the strength of the polymer layer is improved, but the wear resistance and tribological properties deteriorate
Solution Approach 1:
The patent changes the material parameters by replacing conventional ceramic particles (Al2O3) with specifically selected metal oxide particles (bismuth vanadate, chromium-antimony rutile) that have superior tribological properties. This parameter change allows simultaneous achievement of high strength and excellent wear resistance, resolving the contradiction between strengthening the polymer matrix and maintaining wear resistance.
Solution Approach 2:
The patent creates a composite polymer layer by combining polyimide or polyamide-imide polymer matrix with specifically selected metal oxide particles (bismuth vanadate, chromium-antimony rutile) and solid lubricant particles. This composite material approach allows the synergistic combination of strength from the polymer matrix, wear resistance from the metal oxide particles, and lubrication from the solid lubricant particles, resolving the contradiction between strength and wear resistance.
2Force
If the polymer layer is strengthened to handle high loads, then the load capacity is improved, but the coefficient of friction increases
Solution Approach 1:
The patent applies local quality by incorporating solid lubricant particles (such as PTFE, MoS2, graphite) alongside the metal oxide particles in the polymer layer. This creates localized lubricating zones within the polymer layer that reduce friction at the contact surface, allowing the polymer layer to maintain high load capacity while keeping the coefficient of friction low.
Solution Approach 2:
The composite polymer layer combines three functional components: polyimide or polyamide-imide polymer for strength and load capacity, metal oxide particles (bismuth vanadate, chromium-antimony rutile) for wear resistance, and solid lubricant particles for friction reduction. This multi-component composite material resolves the contradiction between load capacity and coefficient of friction by assigning different functions to different components.
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 integration of these metal oxide particles significantly strengthens the polymer matrix, reducing wear and improving the long-term load capacity of the polymer layer, making it suitable for both running-in and sliding layers in high-loaded applications without increasing the coefficient of friction.
Implementation Method 1
Incorporating bismuth vanadate or chromium-antimony-rutile metal oxide particles into a polyimide or polyamide-imide polymer layer, with specific weight proportions and potential admixtures, to enhance the polymer matrix's strength and tribological properties
Implementation Method 2
the polymer layer comprises solid lubricant particles and metal oxide particles... making it suitable for both running-in and sliding layers in high-loaded applications without increasing the coefficient of friction
Data Source
Figure 1
AI summary
The invention relates to a sliding bearing element (1) comprising a polymer layer (4), wherein the polymer layer (4) comprises solid lubricant particles and metal oxide particles and the polymer is exclusively a polyimide polymer or a polyamide-imide polymer, and wherein the metal oxide particles are selected from a group comprising bismuth vanadates, chromium-antimony rutile and mixtures thereof.