Chain Element Boron-Vanadium Surface Layer for Wear Resistance
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Solution Overview
Problem
Conventional surface modifications for chain elements, such as case hardening, nitriding, and titanium or molybdenum coatings, are insufficient in providing wear resistance and corrosion resistance, especially in environments contaminated with lubricants or combustion residues.
Innovation Solution
A surface layer containing boron and vanadium is formed through a two-step process: an intermediate layer with carbon and vanadium is created by diffusing vanadium into the substrate, which is then converted into a surface layer with boron and vanadium by diffusing boron into the intermediate layer, resulting in boron-vanadium compounds like vanadium boride, enhancing wear and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surface modifications (case hardening, nitriding, titanium or molybdenum coatings) are applied to chain elements, then the substrate material gains improved surface properties, but the wear resistance and corrosion resistance remain insufficient under high-load conditions with lubricant and combustion residue contamination
Solution Approach 1:
The patent applies composite materials by creating a multi-layer surface structure consisting of an intermediate layer containing carbon and vanadium compounds, and an outer surface layer containing boron and vanadium compounds. This composite surface structure combines the benefits of different material properties: the intermediate layer provides a transition zone with good adhesion to the substrate, while the outer surface layer provides superior wear and corrosion resistance. The use of vanadium in both layers creates a gradient composition that enhances overall performance under high-load conditions with contamination.
Solution Approach 2:
The patent employs parameter changes by controlling the composition and concentration of alloying elements (carbon, vanadium, boron) at different depths of the surface layer. The intermediate layer has a specific composition range (0.1-5.0 wt% vanadium, 0.5-2.0 wt% carbon) that transitions into the outer surface layer (0.5-10.0 wt% vanadium, 0.1-5.0 wt% boron). This gradient in compositional parameters creates optimal protection: the intermediate layer provides a transition zone for stress distribution, while the outer layer provides maximum wear and corrosion resistance through boron-vanadium compounds.
2Duration of action of moving object
If a surface layer is formed to improve wear and corrosion resistance, then the service life of chain elements is extended, but the production process becomes more complex with multiple diffusion steps
Solution Approach 1:
The patent applies preliminary action by first forming the intermediate layer containing carbon and vanadium compounds before creating the outer surface layer. This intermediate layer serves as a preparatory structure that facilitates subsequent boron diffusion and ensures proper adhesion between the substrate and the final surface layer. The intermediate layer is formed by vanadium diffusion into carbon-containing steel, creating a transition zone that simplifies the subsequent surface layer formation process and ensures overall structural integrity.
Solution Approach 2:
The intermediate layer acts as an intermediary between the substrate material and the outer surface layer. It provides a transition zone that facilitates the diffusion process and ensures proper adhesion. The intermediate layer's composition (carbon and vanadium compounds) serves as a bridge, allowing gradual transition from the substrate to the boron-containing surface layer, thereby simplifying the overall process by creating a compatible interface that reduces defects and improves reliability.
3Strength
If the surface layer is made harder to improve wear resistance, then the chain element can withstand higher mechanical loads, but the ductility of the surface layer may be compromised
Solution Approach 1:
The patent applies local quality by creating distinct compositional zones with different properties at different locations within the surface structure. The intermediate layer has a composition optimized for adhesion and transition (0.1-5.0 wt% vanadium, 0.5-2.0 wt% carbon), while the outer surface layer has a composition optimized for wear and corrosion resistance (0.5-10.0 wt% vanadium, 0.1-5.0 wt% boron). This spatial variation in composition allows the surface to exhibit high hardness where needed (outer layer) while maintaining overall structural integrity and ductility through the gradient transition to the substrate.
Solution Approach 2:
The multi-layer composite structure allows combination of materials with different properties: the intermediate layer provides a transition zone with moderate hardness and good ductility, while the outer surface layer provides high hardness and wear resistance. The composite nature of this surface structure enables the chain element to withstand high mechanical loads through the hard outer layer while maintaining sufficient ductility through the gradient transition to the more ductile substrate, preventing catastrophic failure.
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 resulting chain element exhibits improved wear resistance and corrosion resistance, enabling extended service life in high-load, mechanically and corrosively demanding conditions without compromising the substrate material's properties, particularly in the drive train of motor vehicles.
Implementation Method 1
an intermediate layer is formed that contains carbon and vanadium and is formed by at least one measure for the diffusion of vanadium into areas of the substrate material close to the surface
Implementation Method 2
the surface layer is formed by the conversion of the intermediate layer by at least one measure for the diffusion of boron into the intermediate layer
Data Source
AI summary
Chain element (2), particularly a chain pin (4) for joining at least two chain links (3), which element is formed from a base material (5) containing carbon, particularly steel, characterized in that it has a surface layer (7) containing boron and vanadium, wherein the surface layer (7) is produced by a method according to which, in a first method step, an intermediate layer (6) containing carbon and vanadium is formed by at least one measure for the diffusion of vanadium into surface regions close to the surface of the base material (5) and, in a subsequent second method step, the surface layer (7) is formed by the transformation of the intermediate layer (6) by at least one measure for the diffusion of boron into the intermediate layer (6).