Laser-Textured Joint Surface for High-Strength Anchor Bonding
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Solution Overview
Problem
Existing methods for forming anchor portions on bonding surfaces struggle to achieve a balance between maintaining a shape that easily achieves the anchor effect and ensuring high bonding strength, often resulting in decreased adhesive strength when trying to maintain the desired shape.
Innovation Solution
A joint is formed by creating an anchor portion on a metal bonding surface using a pulsed laser beam, which forms projections with a specific shape that widens in one direction and is narrowly constricted in another, allowing for high bonding strength while maintaining the anchor effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal powder is melted to improve adhesive strength, then bonding strength increases, but the shape that achieves anchor effect deteriorates
Solution Approach 1:
The invention changes the bonding method from melting-based (laser cladding) to diffusion-bonding-based (hot press bonding). By controlling temperature and pressure parameters during hot press bonding, the metal powder particles bond to the substrate without melting, thereby maintaining their spherical shape and anchor effect while achieving high adhesive strength through diffusion bonding at the particle-substrate interface
Solution Approach 2:
The invention avoids the melting phase transition of metal powder that occurs in laser cladding. Instead, it utilizes solid-state diffusion bonding where atoms diffuse across the interface between metal powder particles and substrate at elevated temperatures below the melting point, achieving strong bonding without phase change that would deform the anchor portion shape
2Shape
If metal powder is not melted to maintain shape, then anchor effect is achieved, but bonding strength decreases
Solution Approach 1:
The invention replaces the thermal-melting mechanism (laser cladding) with a mechanical-pressing mechanism (hot press bonding). By applying controlled pressure during bonding, metal powder particles are forced into intimate contact with the substrate surface, and diffusion bonding occurs at the contact interfaces, achieving strong adhesion without the need for melting that would compromise shape
Solution Approach 2:
The invention changes the bonding mechanism from melting-dominated to pressure-dominated. By optimizing pressure and temperature parameters during hot press bonding, sufficient bonding strength is achieved through plastic deformation and diffusion at particle-substrate interfaces while maintaining the spherical shape of metal powder particles that provides the anchor effect
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 described method enables the formation of an anchor portion with high bonding strength to the bonding surface, thereby improving the overall bonding strength of the joint.
Implementation Method 1
a pulsed laser beam is irradiated onto a metal bonding surface 32, thereby forming an anchor portion 34
Implementation Method 2
the resin bonding surface 22 is softened
Data Source
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AI summary
There are provided a joint having high bonding strength and a manufacturing method thereof. There is provided a joint 10 according to the present disclosure including a first member 30 having a first bonding surface 32 provided with an anchor portion 34 and a second member 20 having a second bonding surface 22, and bonds the second bonding surface 22 to the first bonding surface 32, in which the anchor portion 34 has a plurality of projections 35 that protrude from the first bonding surface 32 and are provided side by side along a first direction X, the plurality of projections 35 have undercut portions 35c on both sides in a second direction Y which is a direction perpendicular to the first direction X, and have a cross-sectional shape along the first direction X including a top portion 35d, which widens in the first direction X as approaching the first bonding surface 32 such that a length along the first direction X is the longest on the first bonding surface 32 side.