Laser Welding Coated Ceramic Fiber Preforms
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Solution Overview
Problem
The existing methods for manufacturing composite materials with a metal matrix, particularly in aeronautics, face challenges such as fragility of ceramic fibers, lengthy debinding and degassing processes, manual and precise positioning of coated yarns, and difficulty in welding coated wires, leading to increased complexity, cost, and risk of fiber breakage.
Innovation Solution
A method involving laser welding of coated yarns to form a sheet, which allows for precise and automated welding of ceramic fibers coated with a metal sheath, eliminating the need for binders and reducing the complexity of the manufacturing process by creating a semi-finished product that can be easily handled and worked with.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual positioning of coated yarns is used, then positioning precision is improved, but labor intensity and time consumption increase
Solution Approach 1:
The patent replaces manual mechanical positioning with an automated positioning device that uses mechanical structures (guides, supports, positioning means) to automatically place coated yarns in predetermined positions within the mold cavity, eliminating manual labor while maintaining positioning precision
Solution Approach 2:
The positioning device pre-arranges coated yarns in correct positions before the molding process begins, ensuring precise positioning is achieved automatically without requiring manual intervention during production, thereby reducing time consumption
2Stability of the object's composition
If binder material is used to ensure preform cohesion, then structural integrity is improved, but process complexity and contamination risk increase
Solution Approach 1:
The patent extracts and eliminates the binder material step from the manufacturing process by directly compacting coated yarns into preforms without requiring adhesive binders, thereby simplifying the process and eliminating contamination risks while maintaining preform cohesion through direct mechanical compaction
Solution Approach 2:
The patent discards the binder material that was previously necessary for preform cohesion, achieving the same structural integrity through direct compaction of coated yarns, thereby eliminating the need for debinding steps and reducing process complexity
3Strength
If traditional welding methods are used on coated yarns, then joining function is improved, but fiber breakage risk increases
Solution Approach 1:
The patent changes the welding parameters by using laser welding with controlled energy input and precise positioning, adjusting the thermal parameters to melt and bond the metal coating without excessive heat that would damage the ceramic fiber, thereby achieving strong joints while maintaining fiber integrity
Solution Approach 2:
The patent replaces traditional mechanical or thermal welding methods with laser welding, which provides more precise control over the welding process, concentrating energy exactly where needed to join coated yarns without causing fiber breakage
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 production of a robust, flexible sheet of coated yarns that can be efficiently processed, reducing the risk of fiber damage and eliminating the need for debinding steps, thereby simplifying the manufacturing process and lowering costs while maintaining the integrity of ceramic fibers.
Implementation Method 1
the yarns are welded together, by points, by laser welding
Implementation Method 2
the metal sheaths of the coated wires are welded together and with the walls of the cavity 3 of the container 2, by diffusion
Data Source
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AI summary
The invention relates to a method for manufacturing a bonded web comprising a plurality of coated fibers (8), each including a ceramic fiber (14) encased in a metallic sheath (15), characterized in that the fibers are arranged side by side in the same plane and are spot-welded together by laser welding (13). The invention also relates to the device for implementing the method and to the resulting web. The method is applicable to the manufacture of parts in the field of aeronautical turbomachinery.