Biomedical metastable beta type Zr-Nb alloy ingot casting and preparing method thereof

Abstract

The invention provides a biomedical metastable beta type Zr-Nb alloy ingot casting. The biomedical metastable beta type Zr-Nb alloy ingot casting is composed of components including, by mass percent, 10% to 50% of Nb, 0.05% to 0.15% of O and the balance Zr and inevitable impurities. In addition, the invention further provides a method for preparing the Zr-Nb alloy ingot casting. The method comprises the steps that firstly, raw materials are weighed and mixed to be pressed into a self-consuming electrode block; secondly, combined welding is carried out to obtain a primary self-consuming electrode; thirdly, smelting is carried out to obtain a primary ingot casting; fourthly, combined welding is carried out to obtain a secondary self-consuming electrode; fifthly, smelting is carried out to obtain a secondary ingot casting; sixthly, combined welding is carried out to obtain a three-time self-consuming electrode; seventhly, smelting is carried out to obtain a finished product ingot casting. According to the alloy ingot casting, the content of Zr in the alloy element is higher than the content of Zr-Nb base alloy for traditional nuclear engineering, the chemical component uniformity is good, an alloy bar obtained through machining treatment of the finished product ingot casting has the good comprehensive mechanical property, and the ingot casting has the good application prospect in the surgical implant field of the orthopedics department, the dentistry and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation and processing of zirconium and zirconium alloy materials, and in particular relates to a biomedical metastable β-type Zr-Nb alloy ingot and a preparation method thereof. Background technique [0002] Zirconium (Zr) and titanium (Ti) have similar physical and chemical properties, and have excellent corrosion resistance and biocompatibility. By adding non-toxic alloying element Nb to zirconium metal, its corrosion resistance is improved and further strengthened. Among them, the most typical is Zr-2.5Nb alloy, whose chemical composition, microstructure and mechanical properties have been included in the ASTM-F2384-05 standard, and has been applied in hard tissue repair (hip and knee joint replacement products). [0003] Generally, when the mass content of Nb is less than 6%, the Zr-Nb alloy is mainly composed of martensitic α′ phase; when the mass content of Nb is between 6% and 20%, ω phase is...

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Problems solved by technology

On the other hand, the melting point (2468°C) of the alloying element Nb is higher than that of zirconium (1852°C) and the density is higher. As the Nb content increases, the viscosity of the alloy melt increases, resulting in the melting of the alloying elements Uniform distribution becomes extremely difficult. If the mixing and distribution of raw materials and smelting parameters are not properly controlled, it will definitely cause metallurgical defects such as chemical composition segregation and high-density inclusions in the ingot.

Generally, in the laboratory, the ingots made by vacuum non-consumable arc melting furnaces (commonly known as "button furnaces") have good chemical composition uniformity, but the volume is too small, with a diameter of about 5cm and a height of about 10cm, and Zr cannot be realized. - Pilot scale production of multiple varieties and small batches of Nb alloy products

However, with the increase in the size of Zr-Nb alloy ingots, the difficulty of smelting increases, the probability of chemical composition segregation and high-density inclusions increases, and the chemical composition uniformity of medium-sized alloy ingots is generally difficult to guarantee.

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