Resin-Metal Composite Adhesion via Controlled Surface Roughness
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Solution Overview
Problem
Existing resin-metal composite bodies face challenges in achieving strong adhesion between the resin base material and metal plating, particularly due to surface roughness limitations and the need for surface treatments like acid or blast treatments.
Innovation Solution
A resin-metal composite body with a resin base material having surface roughness Sq of 1.5 μm or more and Sku of 4.5 μm or less, combined with a metal plating, where the resin base material is not subjected to acid or blast treatments, and the metal plating is formed using electroless and electrolytic plating methods to achieve optimal adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surface treatments like acid or blast treatments are applied to improve adhesion, then adhesion between resin and metal plating is enhanced, but the manufacturing process becomes more complex and additional treatment steps are required
Solution Approach 1:
The resin base material is pre-formed with a specific surface roughness (Sq: 1.5 μm or more and Sku: 4.5 μm or less) before plating, creating the optimal surface condition in advance. This preliminary action eliminates the need for subsequent acid or blast treatments, simplifying the manufacturing process while ensuring strong adhesion.
Solution Approach 2:
The invention changes the surface roughness parameters of the resin base material to specific ranges (Sq: 1.5 μm or more and Sku: 4.5 μm or less). By optimizing these physical parameters, the resin surface achieves optimal adhesion properties for metal plating without requiring chemical or mechanical surface treatments.
2Strength
If surface roughness is increased to improve adhesion, then metal plating adhesion is enhanced, but the surface becomes too rough which may affect plating quality and uniformity
Solution Approach 1:
The invention optimizes surface roughness by specifying precise parameter ranges: Sq (arithmetic mean roughness) of 1.5 μm or more for adhesion, and Sku (maximum height roughness) of 4.5 μm or less for plating uniformity. This dual-parameter control achieves both strong adhesion and high plating quality.
Solution Approach 2:
The invention creates a composite structure where the resin base material with controlled surface roughness serves as the substrate for metal plating. The specific surface characteristics (Sq ≥ 1.5 μm, Sku ≤ 4.5 μm) provide optimal mechanical interlocking while maintaining surface uniformity for high-quality plating deposition.
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 enhances the adhesion between the resin and metal, improving the mechanical properties and strength of the composite body without the need for additional surface treatments, while maintaining suitable surface roughness for effective plating.
Implementation Method 1
the metal plating is formed using electroless and electrolytic plating methods to achieve optimal adhesion
Implementation Method 2
the metal plating is formed using electroless and electrolytic plating methods to achieve optimal adhesion
Data Source
AI summary
A resin-metal composite body is provided that includes a resin base material having a surface roughness Sq of 1.5 μm or more and a surface roughness Sku of 4.5 μm or less, and a metal plating on the resin base material.