Sintered Bearing Bush Composition for Wear-Resistant Sliding Bearings
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Solution Overview
Problem
Conventional sintered bearing bush materials for sliding bearings in internal combustion engines and electric motors fail to achieve optimal sliding characteristics and wear resistance.
Innovation Solution
A sintered bearing bush material composed of iron, carbon, manganese, sulphur, nickel, molybdenum, copper, tin, and phosphorus, with a martensitic and bainitic structure, and residual porosity filled with oil, providing enhanced wear and temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sintered bearing bush materials are used, then the bearing bush can be manufactured with residual porosity for oil impregnation, but the sliding characteristics and wear resistance are not optimal
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition ranges of multiple alloying elements (C: 2.0-4.0%, Si: 1.0-3.0%, Mn: 0.5-2.0%, P: 0.10-0.50%, S: 0.05-0.20%, Cu: 0.50-2.00%, Ni: 0.50-2.00%, Mo: 0.10-0.50%, Sn: 0.10-0.50%) and sintering parameters (temperature: 1100-1300°C, holding time: 5-30 minutes) to achieve optimal martensitic structure formation. This systematic parameter optimization resolves the contradiction by achieving superior sliding characteristics and wear resistance through controlled material composition and processing parameters while maintaining manufacturability
Solution Approach 2:
The patent creates a composite material system combining iron base metal with multiple alloying elements (C, Si, Mn, P, S, Cu, Ni, Mo, Sn) that work synergistically to form a martensitic structure with embedded solid lubricants. This composite approach resolves the technical contradiction by integrating multiple functional components into a single sintered bearing material that simultaneously provides structural integrity, wear resistance, and optimal sliding characteristics
2Strength
If the bearing bush material is densely sintered to improve strength, then wear resistance improves, but sliding characteristics deteriorate due to reduced oil retention
Solution Approach 1:
The patent applies local quality by creating a specific microstructure with martensite as the primary phase and controlled residual porosity distribution throughout the material. The martensitic structure provides local hard regions for wear resistance while the distributed porosity provides local oil reservoirs for maintaining sliding characteristics. This spatial differentiation of material properties resolves the contradiction between wear resistance and sliding characteristics
Solution Approach 2:
The patent utilizes porous materials by maintaining controlled residual porosity (5-15%) in the sintered bearing bush material. This porosity serves as oil reservoirs that continuously supply lubricant to the sliding interface. The porous structure resolves the contradiction by providing both mechanical strength through the sintered matrix and sliding characteristics through oil retention in the pores
3Reliability
If solid lubricant content is increased to improve sliding characteristics, then wear resistance improves, but manufacturing complexity increases
Solution Approach 1:
The patent merges the solid lubricant function with the structural matrix by incorporating lubricant elements (P, S, Cu, Ni, Mo, Sn) directly into the sintered bearing material composition rather than as separate components. These elements are integrated into the martensitic structure during sintering, creating a unified material that provides both structural integrity and self-lubrication. This merging resolves the contradiction by eliminating the need for separate lubricant application processes while maintaining superior sliding characteristics and wear resistance
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 sintered bearing bush material exhibits improved sliding characteristics, wear resistance, and temperature resistance compared to conventional materials, with the increased martensite proportion and solid lubricant content contributing to these advantages.
Implementation Method 1
a sintered bearing bush material based on iron
Implementation Method 2
a proportion of martensite in the structure is distinctly increased
Implementation Method 3
a proportion of solid lubricant is distinctly increased
Implementation Method 4
sintered bearing bush materials are usually not densely sintered and accordingly have a residual porosity
Data Source
AI summary
A sintered bearing bush material for a sliding bearing may include: 0.5 to 1.7 percentage by weight carbon; 0.2 to 1.2 percentage by weight manganese; 0.2 to 1.2 percentage by weight sulphur; 1.2 to 2.4 percentage by weight nickel; 1.0 to 2.1 percentage by weight molybdenum; 3.0 to 7.0 percentage by weight copper; 0.2 to 1.2 percentage by weight tin; 0 to 0.8 percentage by weight phosphorus; and a residual component.