A high-ductility cobalt-chromium-based alloy for biomedical capillaries and its preparation method

By preparing a cobalt-chromium-based alloy with low strength and high elongation, the problem of low elongation of Co-Cr-based alloys was solved, enabling the efficient preparation of small-diameter biomedical capillaries and reducing processing difficulty and mold wear.

CN117737548BActive Publication Date: 2026-05-26CENT SOUTH UNIV
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CENT SOUTH UNIV
Filing Date
2024-01-02
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing Co-Cr based alloys have low elongation, are difficult to process, and are prone to wear on molds when preparing small-diameter biomedical capillaries, resulting in low production efficiency.

Method used

Using elements such as Co, Cr, Fe, Ni, and Mo as raw materials, a cobalt-chromium-based alloy with low strength and high elongation was prepared through solution treatment and aging treatment. The alloy with FCC structure and nanoscale BCC precipitates was obtained by using a process flow of vacuum induction melting, homogenization treatment, hot extrusion, solution treatment and aging treatment.

Benefits of technology

The alloy exhibits high ductility, with a tensile strength below 550 MPa and a tensile elongation above 80%, making it suitable for the preparation of small-diameter biomedical capillaries and reducing processing difficulty and mold wear.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN117737548B_ABST
    Figure CN117737548B_ABST
Patent Text Reader

Abstract

A high-ductility cobalt-chromium-based alloy for biomedical capillaries and its preparation method are disclosed. The alloy contains elements such as Co, Cr, Mo, Mn, Si, Fe, and Ni. The alloy is obtained by vacuum induction melting, homogenization treatment, and hot extrusion to obtain a tube blank. Then, solution treatment and aging treatment are performed to obtain a tube blank with low strength and high ductility. Its matrix has an FCC structure with nanoscale BCC structure precipitates inside the grains. These precipitates do not have a strengthening effect but are beneficial to uniform deformation. The tensile strength of the tube blank alloy is less than 550 MPa, but the elongation is greater than 80%. This high elongation and low strength performance is beneficial for the drawing and forming of small-diameter (outer diameter not greater than 1 mm, wall thickness not greater than 0.1 mm) biomedical capillaries.
Need to check novelty before this filing date? Find Prior Art