Extrusion die and preparation method thereof, bismuth telluride crystal bar and preparation method thereof

By designing a mold with a three-segment curved variable diameter feeding section and a variable diameter stress relief section, the cracking problem caused by stress concentration during the hot extrusion of bismuth telluride crystal rods was solved, achieving efficient forming and performance improvement of the material.

CN122125081APending Publication Date: 2026-06-02JIANGXI COPPER TECHNOLOGY RESEARCH INSTITUTE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGXI COPPER TECHNOLOGY RESEARCH INSTITUTE CO LTD
Filing Date
2026-04-08
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Bismuth telluride ingots are prone to stress concentration during hot extrusion, which leads to material cracking and performance degradation. Existing technologies are unable to effectively solve this problem.

Method used

Design an extrusion die comprising a three-section curved variable diameter feed section, a constant diameter discharge section, and a variable diameter stress relief section. By optimizing the die structure, stress concentration is reduced, and a lubricant is used to reduce friction, thereby improving material damage during the extrusion process.

Benefits of technology

This improved the strength and thermoelectric properties of bismuth telluride crystal rods, reduced the material loss rate, ensured a smooth and crack-free surface on the crystal rods, and enhanced the utilization rate and reliability of the materials.

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Abstract

This invention belongs to the field of bismuth telluride materials, specifically disclosing an extrusion die and its preparation method, as well as a bismuth telluride crystal rod and its preparation method. This invention uses an extrusion die with a variable diameter curved surface, and then, with the extrusion die lubricated by a lubricant, hot-extrudes a bismuth telluride billet to obtain a bismuth telluride crystal rod. The method of this invention can improve the cracking problem during the hot extrusion of bismuth telluride, reduce damage during the bismuth telluride extrusion process, lower the loss rate of bismuth telluride, and improve the performance and reliability of the bismuth telluride crystal rod.
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