PVD Layer System for Decorative Motor Vehicle Parts
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Solution Overview
Problem
Existing PVD layer systems for electroplated layers face challenges in achieving durable, hard, and corrosion-resistant coatings while also providing aesthetic color options, with prior solutions often compromising on adhesion, layer stress, and decorative appearance.
Innovation Solution
A PVD layer system comprising an adhesive layer directly on the electroplated layer, a hard mixed layer with specific metal compositions like (Cr a Zr b ) u (C k N l ) v, and a colored top layer, where the mixed layer is optimized for substoichiometric X components and varying concentrations to ensure hardness, resistance, and decorative appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PVD layer system with adhesive layer, mixed layer, and colored top layer is applied to electroplated layers, then durability, hardness, and corrosion resistance are improved, but adhesion and layer stress control become problematic
Solution Approach 1:
The coating system is divided into distinct functional layers: an adhesive layer for bonding, a mixed layer with substoichiometric X components for hardness and stress control, and a colored top layer for aesthetics. This segmentation allows each layer to be optimized independently for its specific function while managing overall layer stress.
Solution Approach 2:
The mixed layer uses composite material composition combining metal elements (Me1 and Me2) with substoichiometric non-metallic elements (X from carbon, nitrogen, oxygen groups). This composite structure provides both the hardness and stress management properties needed, resolving the contradiction between durability and stress control.
2Strength
If the mixed layer is made harder and more resistant, then durability improves, but adhesion to the electroplated layer becomes difficult
Solution Approach 1:
An adhesive layer is introduced as an intermediary between the electroplated layer and the hard mixed layer. This adhesive layer acts as a mediator that ensures strong bonding while allowing the mixed layer to maintain its hardness and resistance properties without compromising adhesion.
Solution Approach 2:
The mixed layer uses substoichiometric concentrations of non-metallic elements (X) to optimize the balance between hardness and adhesion. By controlling the concentration parameters of X components, the layer achieves sufficient hardness while maintaining compatibility and bonding with adjacent layers.
3Illumination intensity
If the colored top layer is made thicker for better color coverage, then aesthetic appearance improves, but hardness and corrosion resistance decrease
Solution Approach 1:
Different layers are assigned different functional qualities: the mixed layer provides hardness and resistance with controlled thickness, while the colored top layer provides aesthetic appearance. This local quality assignment allows the colored layer to be optimized for color coverage without compromising the protective properties provided by the underlying mixed layer.
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 provides a durable, corrosion-resistant, and aesthetically appealing PVD layer system with reduced layer stresses, allowing for various color effects and improved adhesion, while maintaining the metallic character and decorative appearance of the electroplated layer.
Implementation Method 1
A PVD layer system on the electroplated layer arrangement is proposed, which comprises an adhesive layer which lies directly on the electroplated layer arrangement, a durable and hard mixed layer which is applied to the adhesive layer and a colored top layer which is applied to the mixed layer
Data Source
Figure 1~2
AI summary
The invention relates to a decorative part, comprising an electroplated layer array applied to a plastic substrate. On the electroplated layer array, a PVD layer array having an adhesive layer, a mixed layer, and a color-providing cover layer is provided, wherein the mixed layer provides for durability, in particular corrosion protection, and the necessary hardness of the surface.