A method of gradient welding of a ceramic matrix composite to a high temperature alloy annular
By radially partitioning the annular welding surface of the ceramic matrix composite and high-temperature alloy ring and laying different brazing filler metals and reinforcements, the problems of large residual stress and easy cracking caused by thermal expansion coefficient mismatch were solved, thus improving the crack resistance and reliability of the joint.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- AVIC BEIJING AERONAUTICAL MFG TECH RES INST
- Filing Date
- 2026-05-22
- Publication Date
- 2026-07-17
AI Technical Summary
The connection between ceramic matrix composites and high-temperature alloy ring parts has problems such as large residual stress, easy cracking and low reliability due to the mismatch of thermal expansion coefficients. Existing technologies cannot accurately strengthen the inner and outer edge areas where the stress peak is the highest.
The gradient welding method is adopted to divide the annular welding surface into multiple regions radially, and different types of brazing filler metal and reinforcements are laid in different regions. This includes laying high-toughness sandwich composite brazing filler metal on the outer and inner stress buffer zones, and laying homogeneous brazing filler metal in the middle, forming a mechanical property distribution of high toughness at the inner and outer edges and high strength in the middle.
It effectively alleviates residual stress caused by edge effect and difference in thermal expansion coefficient, reduces inner and outer stress by 20%, and improves the crack resistance and reliability of ring joint.
Smart Images
Figure CN122400705A_ABST