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Si-containing high-strength low-modulus medical titanium alloy and additive manufacturing method and application thereof

An additive manufacturing, titanium alloy technology, applied in the field of additive manufacturing of high-strength and low-modulus medical titanium alloy implants, can solve problems such as deterioration of mechanical properties and formability, and achieve improved yield strength, low elastic modulus, resistance to The effect of increasing tensile strength

Active Publication Date: 2020-05-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The primary purpose of the present invention is to provide an additive manufacturing method for Si-containing high-strength low-modulus medical titanium alloy that effectively solves the problem of deterioration of mechanical properties and formability caused by the introduction of Si, an essential element for bioactivity.

Method used

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  • Si-containing high-strength low-modulus medical titanium alloy and additive manufacturing method and application thereof
  • Si-containing high-strength low-modulus medical titanium alloy and additive manufacturing method and application thereof
  • Si-containing high-strength low-modulus medical titanium alloy and additive manufacturing method and application thereof

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Embodiment 1

[0039] A method for additive manufacturing of Si-containing high-strength low-modulus medical titanium alloy, comprising the following steps:

[0040] (1) Alloy composition design: based on the alloy composition ratio of Ti68.3at.%, Nb23.3at.%, Zr4.7at.%, Ta1.7at.%, Si2at.%, among them, Bo=2.88, Md=2.46 ,satisfy The metastable β-Ti region in the relationship diagram (attached figure 1 The position of the middle arrow is determined by Bo=2.88, Md=2.46), and the atomic percentage of each alloy can be determined by and Determined, use sponge titanium, sponge zirconium, tantalum-niobium master alloy (solid solution of niobium and tantalum), and silicon as raw materials to prepare alloy components; figure 1 for Relationship diagram (Scripta Materialia 158(2019) 62-65), where the shaded part is the metastable β-Ti region.

[0041] Table 1 Bo, Md values ​​of different alloying elements in bcc-Ti

[0042]

[0043] Table 1 shows the Bo value and Md value of each alloy elem...

Embodiment 2

[0052] A method for additive manufacturing of Si-containing high-strength low-modulus medical titanium alloy, comprising the following steps:

[0053] (1) Alloy composition design: based on the alloy composition ratio of Ti68.3at.%, Nb23.3at.%, Zr4.7at.%, Ta1.7at.%, Si2at.%, among them, Bo=2.88, Md=2.46 ,satisfy In the metastable β-Ti region in the relationship diagram, the alloy components are prepared with sponge titanium, sponge zirconium, tantalum-niobium master alloy, and silicon monomer as raw materials;

[0054] (2) Flour making: the elements of Ti, Nb, Zr, Ta and Si are batched according to the content of step (1), and smelted in a vacuum consumable arc smelting furnace with a smelting speed of 20kg / min and remelted twice. Obtain an ingot with no obvious segregation in composition, machine the metal ingot into a round bar of φ60mm×650mm, remove the surface oxide skin, and prepare alloy powder by plasma rotating electrode atomization powder making method (PREP), the a...

Embodiment 3

[0059] A method for additive manufacturing of Si-containing high-strength low-modulus medical titanium alloy, comprising the following steps:

[0060] (1) Alloy composition design: with the alloy composition ratio of Ti69.6at.%, Nb23.7at.%, Zr4.8at.%, Ta1.7at.%, Si0.1at.%, among them, Bo=2.88, Md =2.47, satisfy In the metastable β-Ti region in the relationship diagram, the alloy components are prepared with sponge titanium, sponge zirconium, and tantalum-niobium master alloy as raw materials;

[0061] (2) Flour making: the elements of Ti, Nb, Zr, Ta and Si are batched according to the content of step (1), and smelted in a vacuum consumable arc smelting furnace with a smelting speed of 20kg / min and remelted twice. Obtain an ingot with no obvious segregation in the composition, machine the metal ingot into a round bar of φ45mm×550mm, remove the surface scale, and prepare alloy powder by electrode induction melting gas atomization method (EIGA), the atomization pressure is 4.0M...

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Abstract

The invention discloses a Si-containing high-strength low-modulus medical titanium alloy and an additive manufacturing method and application thereof. The preparation method comprises the following steps of designing an alloy component, preparing powder, constructing a model, preheating a substrate and manufacturing an additive, wherein the designed Si-containing high-strength low-modulus medicaltitanium alloy comprises, 60-70 at.% of Ti, 16-24 at.% of Nb, 4-14 at.% of Zr, 1-8 at.% of Ta and 0.1-5 at% of Si. According to the manufacturing method, the high-strength low-modulus and good-biocompatible medical beta-type titanium alloy is designed according to a D electronic theory, the thermal expansion difference value between silicide and a beta-Ti crystal phase is reduced through preheating, and meanwhile, the sufficient cooling degree in the additive manufacturing process is ensured to promote the transition of the alloy from a discrete eutectic crystal to the desorption reaction, andthe common problems such as easy cracking caused by continuous distribution of a Si-containing phase along a grain boundary are solved.

Description

technical field [0001] The invention relates to the technical field of titanium alloy materials and additive manufacturing, in particular to a method for additive manufacturing of high-strength and low-modulus medical titanium alloy implants. Background technique [0002] Compared with medical metal materials such as stainless steel and Co-Cr alloy, titanium alloy has excellent biomechanical properties and good biocompatibility, and is widely used as human hard tissue replacement materials and restorations such as bone trauma products and artificial joints. However, clinical studies have found that traditional titanium alloys (α titanium alloys, α+β titanium alloys) have a "stress shielding" effect due to mismatching elastic moduli. After long-term implantation in the human body, the original bone tissue function will be degraded and absorbed. It leads to implant failure, and titanium alloy is a biologically inert material, which is difficult to form a strong chemical osseoi...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/04B22F1/00B22F9/08B22F9/14B22F3/105B33Y70/00B33Y10/00A61L27/02A61L27/06A61L27/50A61L27/54
CPCB22F1/0003C22C14/00C22C1/0458B22F9/082B22F9/14B33Y70/00B33Y10/00A61L27/06A61L27/50A61L27/54A61L27/025B22F2009/0836A61L2300/10A61L2300/412A61L2430/24A61L2430/38A61L2430/02B22F10/00B22F10/32B22F10/36B22F10/28B22F10/366B22F10/38B22F12/17Y02P10/25B22F1/065B22F10/34B22F10/25B22F9/08B22F2009/0808B22F2301/205
Inventor 李元元杨超罗炫
Owner SOUTH CHINA UNIV OF TECH
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