Method for preparing high-density low-carbon-oxygen titanium alloy

The two-stage sintering process with optimized binders addresses internal defects in titanium alloys by effectively removing impurities and enhancing densification and uniformity, improving mechanical properties.

CN120306643APending Publication Date: 2025-07-15SHENZHEN ELEMENT TECH CO LTD
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Patent Information

Application Number
CN202510422345.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-07
Publication Date
2025-07-15

AI Technical Summary

Technical Problem

Traditional titanium alloy binders are prone to gas residues and uneven shrinkage during degreasing and sintering, resulting in the presence of pores, affecting the mechanical properties of the material, and easily introducing C and O impurities, limiting the application of titanium alloys in high-end fields.

Method used

The optimized two-stage sintering process is adopted, including thermal degreasing and second-stage sintering, combined with oxalic acid catalytic degreasing, fully evaporates the binder at a temperature, reduces the C and O content, and promotes the diffusion and rearrangement of titanium alloy atoms.

Benefits of technology

It effectively reduces the C and O content in titanium alloy, improves density and tissue uniformity, reduces the risk of cracking and deformation, enhances the thoroughness of impurity removal, and improves material performance.

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Abstract

The invention discloses a method for preparing a high-density and low-carbon-oxygen titanium alloy. The method comprises the following steps: weighing a certain mass of spherical TC4 powder and a binder; the spherical TC4 powder and a binder are put into an internal mixer to be mixed; putting the mixed feed into a granulator, and extruding and granulating to obtain granular injection feed; putting the granular injection feed into an injection stock bin, and injecting into a mold to obtain a TC4 green body; the TC4 green body is subjected to degreasing treatment; and the TC4 degreased blank is sintered, the first stage is a thermal degreasing stage, the TC4 degreased blank is cooled to the room temperature along with a furnace, then the second stage is sintered, the TC4 degreased blank is cooled to the room temperature along with the furnace, and a TC4 sintered part is obtained. According to the method for preparing the high-density and low-carbon-oxygen titanium alloy, an optimized two-section type sintering process is adopted for the blank, a binder can be fully volatilized and discharged at the low temperature, the content of C and O in a titanium alloy sintered part is reduced, and the method has the advantages that atomic diffusion and rearrangement of the titanium alloy blank are more orderly, the density is effectively improved, and the service life of the titanium alloy blank is prolonged. And the cracking and deformation risks are reduced.
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