A light-weight high-strength metal powder injection molding material, a processing method thereof and a rotating shaft

By optimizing the titanium alloy composition and composite binder, and combining segmented sintering and gradient pressure forming processes, the problems of plastic deformation and dimensional inconsistency of the shaft in the titanium alloy MIM process were solved, and high-precision, reliable and consistent shaft manufacturing was achieved.

CN122352899APending Publication Date: 2026-07-10
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Filing Date
2026-05-15
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing titanium alloy MIM processes are difficult to meet the high-precision control requirements of slender, high-dimensional consistency hinges used in foldable screens. They are prone to plastic deformation and fatigue fracture, and are also prone to flexural deformation and dimensional inconsistency during the molding process.

Method used

Lightweight, high-strength metal powder injection molding material is used. By rationally introducing alloying elements such as Al, V, Zr, Ta, Fe, and Hf and controlling the oxygen content, combined with multi-component composite binders, and combined with segmented temperature-controlled sintering, gradient pressure double high-pressure shaping and positioning pretreatment processes, material uniformity and molding accuracy are ensured.

Benefits of technology

The high strength, toughness and fatigue resistance of the shaft have been improved, ensuring that the slender and thin-walled shaft does not undergo plastic deformation and fracture under long-term reciprocating bending, thus meeting the requirements of high-end smart terminals for lightweight, high precision and high reliability of core components.

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Abstract

The application discloses a kind of light high-strength metal powder injection molding materials, its processing method and the shaft made, belong to metal powder injection molding technical field.Forming material in the application is titanium as matrix, reasonable proportioning auxiliary element and oxygen content, utilize inter-element solid solution strengthening effect to promote material comprehensive performance, and match with the multi-component composite binder suitable for powder, ensure forming processing performance.Processing method is accurately controlled mixing, injection molding, debinding, sintering and two high-pressure shaping processes, combined with partition control to improve dimensional accuracy.Thin-walled shaft made by the application is dimensionally stable, fatigue resistance, suitable for batch production of high-precision thin-walled shafts for folding terminal devices.
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