A brazing method for inhibiting cold brittleness of a zirconia ceramic brazed joint at extremely low temperature

CN122102728APending Publication Date: 2026-05-29HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH
Filing Date
2026-04-07
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The brazed joints of YSZ ceramics and Kovar alloys are prone to cold brittle failure at extreme low temperatures. Existing methods are difficult to effectively suppress the formation of continuous brittle phases, resulting in poor joint strength and toughness, which cannot meet the application requirements of aerospace and cryogenic refrigeration fields.

Method used

By introducing a pure Cu interlayer and precisely controlling the brazing process parameters to regulate the diffusion sequence of Ti elements, the formation of continuous brittle compound bands on the Kovar side is suppressed, the microstructure of the joint is optimized, and the shear strength and elongation at fracture of the joint are improved at extreme low temperatures.

Benefits of technology

The prepared brazed joint has a shear strength of ≥173MPa and a fracture elongation of ≥16% at -196℃, which significantly improves the strength and toughness of the joint and solves the problem of low-temperature brittle failure. It is suitable for aerospace, cryogenic refrigeration and other fields.

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Abstract

A brazing method for inhibiting cold brittleness of a zirconia ceramic brazed joint, relates to a YSZ ceramic and Kovar alloy brazing connection method. In order to solve the problem that the existing YSZ ceramic and Kovar alloy brazed joint is prone to low temperature cold brittle failure, the cold brittle resistant YSZ ceramic and Kovar alloy brazing connection method introduces a pure Cu intermediate layer, accurately controls the brazing process parameters, realizes accurate control of the Ti element diffusion time sequence, inhibits the generation of continuous brittle compound bands on the Kovar side, optimizes the microstructure of the joint, improves the shear strength and fracture elongation of the joint at-196 DEG C extreme low temperature, and fundamentally solves the low temperature cold brittle failure problem of the joint.
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