Thermal Spray Coating Vehicle Components with Solid Lubricants
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Solution Overview
Problem
Existing thermal spray coating methods for vehicle components using solid lubricants face challenges such as high volatility and decomposition of solid lubricants at high temperatures, leading to low incorporation rates and complex manufacturing processes, resulting in sub-optimal lubrication properties and increased production costs.
Innovation Solution
A thermal spray coating process that positions a solid lubricant injection device to intersect the spray line at an intermediate point between the thermal spray device's outlet and the component surface, allowing for higher solid lubricant incorporation without compromising deposition efficiency, using a separate or integrated injection device to manage volatile and decomposable solid lubricants, and incorporating a plasma spray device for compatibility with existing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid lubricants are used in thermal spray coating at high temperatures, then lubrication properties are improved, but the solid lubricants undergo high volatility and decomposition leading to low incorporation rates
Solution Approach 1:
The coating process is divided into two separate stages: first applying a metal coating layer, then applying the solid lubricant coating layer separately. This segmentation allows each coating material to be optimized for its specific application conditions, preventing the solid lubricant from being exposed to excessive temperatures during the metal coating process.
Solution Approach 2:
The metal coating is applied first as a preliminary step, creating a stable base layer before applying the solid lubricant. This preliminary action prepares the surface for optimal solid lubricant adhesion while protecting the lubricant from thermal degradation.
2Manufacturing precision
If conventional thermal spray methods are used, then coating is achieved, but the manufacturing process becomes complex and production costs increase
Solution Approach 1:
The invention combines the metal coating and solid lubricant coating into a single integrated thermal spray process. The spray gun is designed to accommodate both coating materials, allowing sequential application without requiring separate manufacturing operations, thereby simplifying the overall manufacturing process.
Solution Approach 2:
The spray parameters (temperature, velocity, gas flow) are dynamically adjusted between the two coating stages. During metal coating, higher temperatures are used for proper melting and adhesion. During solid lubricant coating, parameters are modified to prevent decomposition while ensuring adequate deposition.
3Productivity
If high temperatures are used for thermal spray coating, then deposition efficiency is improved, but solid lubricants decompose and volatilize
Solution Approach 1:
The thermal spray process uses dynamic parameter adjustment where temperature, gas flow rate, and spray velocity are continuously optimized based on the coating material being applied. This allows high deposition efficiency for the metal layer while maintaining lower effective temperatures for the solid lubricant layer to preserve its compositional stability.
Solution Approach 2:
The coating process alternates between high-temperature metal deposition and lower-temperature solid lubricant deposition in periodic cycles. This periodic action allows the system to achieve high productivity during metal coating while protecting the solid lubricant from thermal degradation during its application phase.
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
This approach enables the deposition of higher solid lubricant proportions on vehicle components, reducing frictional losses and improving lubrication properties, while simplifying manufacturing and reducing unwanted deposition, thereby enhancing fuel economy and reducing emissions.
Implementation Method 1
Thermal spray coating involves propelling melted or molten spray material at high speed onto a cleaned and prepared component surface
Implementation Method 2
a solid lubricant injection device comprising a fluidized solid lubricant inlet
Data Source
AI summary
An arrangement (40) and process for coating a vehicle component (30) with a solid lubricant including a thermal spray device (10) having a spray direction along a spray line (S) corresponding to a central axis of a spray plume (16); a solid lubricant injection device (20) having an injection direction along an injection line (L) corresponding to a central axis of an injection plume (24); and a vehicle component (30) to be coated, having a surface (31) arranged at a distance (d) from an outlet orifice (13) of the thermal spray device (10) along the spray line (S). The solid lubricant injection device (20) is positioned such that the injection line (L) intersects the spray line (S) at an intersection point (P), which is intermediate the outlet orifice (13) of the thermal spray device (10) and the surface (31) of the component (30) to be coated. Also a process for thermal spray coating a vehicle component (30) with a solid lubricant coating and a vehicle, with such a coated component.