Multilayer Sliding Bearing Element Bond Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing steel-aluminum composite plain bearings face challenges in achieving strong bonds due to thermodynamic diffusion reactions between iron and aluminum, leading to reduced bond strength and adhesive issues, especially under elevated temperatures.
Innovation Solution
A multi-layer plain bearing element is developed with a bonding layer made of aluminum or a soft-phase-free aluminum-based alloy and a bearing metal layer composed of alloys like Sn, Bi, In, or Pb, featuring a continuous grain boundary between the layers, which enhances bond strength and prevents crack propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If roll cladding process is used to produce steel-aluminum composite plain bearings, then the bearing can be manufactured with aluminum-based bearing metal layer, but the bond strength between steel support and aluminum layer is reduced due to thermodynamic diffusion reactions and intermetallic phase formation
Solution Approach 1:
The patent introduces an intermediate binding layer made of pure aluminum or aluminum alloy without soft phases (Sn, Bi, In, Pb) between the steel support and the bearing metal layer. This intermediate layer acts as a mediator that prevents direct thermodynamic diffusion reactions between iron and aluminum, thereby avoiding the formation of harmful intermetallic phases while maintaining effective bonding. The binding layer serves as a buffer zone that eliminates the harmful interaction between the steel substrate and the bearing metal containing soft phase elements.
Solution Approach 2:
The patent employs a three-layer composite structure consisting of steel support layer, intermediate binding layer, and bearing metal layer. This composite material approach allows each layer to have optimized properties: the steel provides structural strength, the intermediate aluminum layer provides bonding capability without diffusion reactions, and the bearing metal layer provides lubrication properties through soft phase elements. The composite structure resolves the contradiction by combining materials with complementary functions while preventing harmful interactions.
2Strength
If binding layer is introduced between steel and bearing metal, then bond strength is improved, but the structure becomes more complex with multiple layers
Solution Approach 1:
The intermediate binding layer performs multiple functions simultaneously: it provides adhesive bonding to the steel support, prevents thermodynamic diffusion reactions, serves as a substrate for the bearing metal layer, and contributes to the overall mechanical strength of the composite. By making the binding layer multi-functional, the patent reduces the need for additional specialized layers, thereby limiting the increase in structural complexity while achieving multiple objectives.
3Reliability
If soft phase elements (Sn, Bi, In, Pb) are added to aluminum-based bearing alloy, then lubrication properties are improved, but the bond strength with steel support is reduced due to diffusion reactions
Solution Approach 1:
The patent segments the aluminum-based bearing alloy system into two distinct parts: an intermediate binding layer without soft phase elements that bonds to steel, and an outer bearing metal layer containing soft phase elements (Sn, Bi, In, Pb) that provides lubrication. This segmentation physically separates the functions of bonding and lubrication into different layers, allowing the soft phase elements to be present in the bearing metal without interfering with the bond strength at the steel interface, since the intermediate layer blocks diffusion reactions.
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 improves the adhesive strength and durability of the composite, allowing it to withstand higher loads and prevent delamination, while also allowing for adjustable properties like damping and strength based on layer configurations.
Implementation Method 1
a continuous grain boundary between the bonding layer and the bearing metal layer is formed
Implementation Method 2
producing a two-layer starting material from the first aluminum-based alloy, which forms a first layer of the starting material, and the second aluminum-based alloy, which forms a second layer of the starting material, by composite casting
Data Source
Figure 1~3
Figure 4~6
Figure 7~8
AI summary
The invention relates to a multilayer plain bearing element (14) composed of a composite material comprising a supporting layer (2), a binding layer (3) connected to the supporting layer (2), and a bearing metal layer (4) connected to the binding layer (3), wherein the binding layer (3) is composed of aluminum or a first, soft-phase-free aluminum-based alloy and the bearing metal layer (4) is composed of a second aluminum-based alloy containing at least one soft phase, and the binding layer (3) and the bearing metal layer (4) are connected to each other by means of a fusion-metallurgy connection in such a way that a binding zone arranged between the binding layer (3) and the bearing metal layer (4) is formed, wherein grains (9, 10) are formed in the binding zone and a continuous grain boundary course between the binding layer (3) and the bearing metal layer (4) is formed in the binding zone.