TiAl Brazing Repair Using Padding Plate to Contain Melted Paste
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Solution Overview
Problem
The existing brazing methods for repairing defects in TiAl intermetallic compounds, which are brittle and prone to cracking, face challenges with high residual stress and low ductility when using filler materials of the same material, leading to difficulty in effective repair.
Innovation Solution
A brazing method that involves using a padding plate made of the same material as the base material, fixed with a titanium foil, to prevent the mixture paste of base material and brazing filler material powders from flowing out, with the base material powder having a larger particle diameter than the brazing filler material powder, and heating in a vacuum furnace between 1000° C. and 1200° C. for efficient repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a padding plate is not arranged during brazing, then the brazing process is simpler, but the mixture paste flows out from the groove causing poor repair quality
Solution Approach 1:
A padding plate made of the same material as the base material is introduced as an intermediary component during the brazing process. This padding plate is arranged at the lower position from the groove and prevents the mixture paste of base material powder and brazing filler material powder from flowing out during heating and fusion, thereby ensuring proper filling and fusion within the groove while maintaining repair quality
2Stability of the object's composition
If filler material made of the same material as base material is used for buildup welding, then material compatibility is improved, but residual stress increases and ductility decreases making repair difficult
Solution Approach 1:
A mixture paste comprising both base material powder and brazing filler material powder is used instead of pure base material filler. The brazing filler material powder has a lower melting point than the base material, allowing the paste to be fused at temperatures below the base material's melting point. This composite approach reduces residual stress and improves ductility while maintaining adequate material compatibility for repairing TiAl intermetallic compound parts
Solution Approach 2:
The melting point parameter of the filler material is changed by using brazing filler material with a lower melting point than the base material. This allows the brazing process to be conducted at temperatures that avoid excessive residual stress generation while still achieving proper fusion and repair of the base material defects
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 effectively prevents the brazing filler material from flowing out and ensures proper filling and fusion within the groove, allowing for more accurate and efficient repair of TiAl intermetallic compounds, improving the repair quality and reducing the risk of further cracking.
Implementation Method 1
heating the base material such that base material powder is melt, after a paste comprising a base material powder which is formed of a same material as the base material is filled in the groove
Implementation Method 2
a padding plate made of the same material as the base material, fixed with a titanium foil
Data Source
AI summary
A brazing method includes fixing a padding plate on a base material such that the padding plate is arranged in a lower position from a groove formed in a repair region of the base material, and heating the base material such that a base material powder is melt, after a paste that base material 1 contains the base material powder which is formed from a same material as the base material is filled into the groove. The base material powder filled into groove can be prevented from flowing out from the groove even if being fused since the padding plate is arranged for the base material. Thus, a repair region can be repaired more appropriately.