Welding Thermoplastic Composite to Elastomer via Powder Functionalization
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Solution Overview
Problem
There is no known method for assembling composite materials with a thermoplastic matrix and elastomeric materials through welding, as elastomers do not reversibly transition from a solid to a molten state, making traditional heating-based assembly techniques ineffective, and existing bonding methods lack the mechanical strength required for certain applications.
Innovation Solution
A method involving the functionalization of elastomeric materials by incorporating a thermoplastic powder, followed by pressure vulcanization to create a compatible layer, which is then welded to a thermoplastic composite material, utilizing techniques like induction heating and vacuum processes to achieve a strong bond.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional bonding methods are used to assemble thermoplastic composite material with elastomer, then assembly is feasible, but mechanical strength is insufficient
Solution Approach 1:
The invention applies composite material principle by creating a multi-layer structure consisting of elastomer material combined with thermoplastic powder layers. This composite structure enables welding capability while maintaining elastomeric properties, resolving the contradiction between mechanical strength and assembly feasibility.
Solution Approach 2:
The invention changes the physical and chemical parameters of the elastomer surface by incorporating thermoplastic powder and applying heat treatment. This transforms the elastomer from a non-weldable state to a weldable state, enabling strong mechanical bonds while simplifying the assembly process.
2Strength
If welding is used to assemble thermoplastic composite material with elastomer, then mechanical strength is improved, but elastomer phase transition limitation prevents direct welding
Solution Approach 1:
The invention introduces thermoplastic powder as an intermediary substance between the elastomer and the thermoplastic composite material. This intermediary layer enables welding by providing a thermoplastic component that can undergo phase transition, while the bulk elastomer maintains its original properties.
Solution Approach 2:
The invention applies local quality principle by modifying only the surface layer of the elastomer with thermoplastic powder, while the bulk elastomer retains its original properties. This localized modification enables welding at the interface without requiring the entire elastomer to undergo phase transition.
3Ease of manufacture
If bonding methods are used to assemble the structure, then assembly is achievable, but multiple interfaces create stress and pollution issues
Solution Approach 1:
The invention merges the elastomer material with thermoplastic powder to create a unified weldable interface. This eliminates the need for separate adhesive layers and primers, reducing the number of interfaces and associated stress concentration points while preventing contamination issues.
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 method enables the creation of a welded structural connection with enhanced mechanical strength, eliminating the need for multiple interfaces and stress-related issues present in bonding, while allowing for flexible assembly timing and compatibility with thermoplastic materials.
Implementation Method 1
the functionalization being carried out by producing a thin layer of raw elastomeric material integrating a proportion of powder of material thermoplastic and fusion of said layer with the main layer of elastomeric material during the pressure vulcanization operation of said elastomeric material
Implementation Method 2
it is possible to implement several known heating principles such as heating by hot gas (oven, autoclave), by vibration (ultrasound, rotation), by induction, by resistance, etc
Implementation Method 3
after welding, there is no longer a differentiated interface between the two assembled parts, due to the diffusion of the molecules from one part to the other
Data Source
Figure 1
Figure 2~3
AI summary
The invention concerns a method for producing, by welding, a link between a thermoplastic matrix composite material (36) and an elastomeric material (33). The method mainly comprises an operation of functionalising the elastomeric material (33) by forming a thin layer (24) of elastomeric material incorporating particles of thermoplastic material (24) and melting said thin layer onto the surface of the elastomeric material during the operation of pressure-vulcanising the elastomer, in addition to a welding operation consisting of welding the functionalised surface of the elastomeric material (33) to the thermoplastic material of the composite (36). The welding operation consists of interposing a metal fabric (35) coated with thermoplastic material between the surfaces of the elastomer (33) and the composite (36) that are to be welded to each other, and of passing an electric current through same, resulting in the surface melting of the two materials.