Sealed Vessel Laser Joining Ceramic Matrix Composites
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Solution Overview
Problem
Existing methods for joining ceramic matrix composites and refractory metals, such as brazing, often result in reactions with oxygen and nitrogen due to incomplete shielding, leading to inefficiencies and increased costs, especially when using local heating techniques.
Innovation Solution
A system and method utilizing a sealed vessel with a transparent window for a laser to heat materials within a controlled environment, incorporating a reactive metal to purify the atmosphere and a purge gas system to minimize oxygen and nitrogen exposure, allowing precise localized heating without extensive shielding or expensive controlled environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If local heating is used to join materials quickly, then heating and cooling speed is improved, but reaction with oxygen and nitrogen increases
Solution Approach 1:
The patent employs a sealed chamber filled with inert or reactive gas atmosphere to prevent oxidation and nitrogen reaction during laser heating. The chamber maintains a controlled environment that allows rapid local heating while eliminating harmful reactions with ambient air, thus resolving the contradiction between heating speed and reaction prevention.
2Object-affected harmful factors
If shielding gas is directed to the piece during heating, then reaction with ambient air is inhibited, but some reaction still takes place
Solution Approach 1:
Instead of relying on shielding gas directed at the piece, the patent uses a sealed chamber that completely encloses the work area, providing comprehensive inert or reactive atmosphere protection. This eliminates gaps and exposure points, ensuring complete prevention of oxidation and nitrogen reaction, thereby improving both protection effectiveness and reliability.
3Object-affected harmful factors
If the piece is placed in a sealed environment for heating, then reaction with ambient air is inhibited, but the equipment cost increases significantly
Solution Approach 1:
The patent implements a sealed chamber system that provides complete atmospheric protection during laser heating. By using a reactive metal powder that chemically binds residual oxygen and nitrogen, the system achieves superior protection effectiveness while maintaining reasonable equipment complexity and cost, resolving the contradiction between protection quality and equipment expense.
4Object-affected harmful factors
If a reactive metal is added to purify the atmosphere, then oxygen and nitrogen levels are reduced, but the system complexity increases
Solution Approach 1:
The patent uses reactive metal powder that automatically purifies the atmosphere through chemical reaction with residual oxygen and nitrogen. This self-service mechanism eliminates the need for complex vacuum systems or sophisticated gas purification equipment, achieving effective atmosphere control while keeping the system relatively simple and cost-effective.
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
Enables efficient and cost-effective joining of materials by maintaining a low oxygen/nitrogen environment within the vessel, reducing reaction risks and enhancing the quality of the joining process while allowing for precise and localized heating.
Implementation Method 1
a laser disposed external to the vessel and configured to heat material through electromagnetic radiation
Implementation Method 2
In some embodiments, the system includes a reactive metal disposed in the inner chamber with the reactive metal in a line of sight of the laser
Data Source
AI summary
A system and method for joining materials. The system includes a sealed chamber having a window. A laser is disposed external to the sealed chamber and heats objects in the sealed chamber through the window. The method includes sealing objects to be joined in the sealed chamber with a controlled environment and heating the objects with a laser disposed external to the sealed chamber.