Constant diameter right-angle extruding production of micro/nanometer crustal industrial pure titanium block

Abstract

An isometric angle squeezing technology for preparing micron / nano-crystal industrial-purity Ti block includes such steps as providing an industrial-purity Ti block, annealing, holding its temp, cutting it to become blanks, polishing the surface of blank, coating glass lubricant, coating graphite lubricant on the inner surface of an isometric angle squeezing die with a squeezing channel angle of 90-120 deg, heating said blank and die, and isometric angle squeezing. Its product has high strength, plasticity, biocompatibility and anticorrosion nature, the elastic modulus similar to that of bone, and low cost.

Description

technical field [0001] The invention relates to a preparation method in the technical field of metal materials, in particular to a preparation method for equal-diameter angular extrusion of micro / nano crystal industrial pure titanium blocks. Background technique [0002] Among all biomedical materials, metal materials are the earliest to be used, and are mainly used to repair bones, joints, teeth, and blood vessels. Currently used in biomedical materials are mainly stainless steel, titanium and titanium alloys. Metal titanium is extremely rich in reserves in the earth's crust. It exists in ores in the form of compounds. The main ores are ilmenite FeTiO 3 . Titanium has certain strength and high plasticity. High-purity titanium has σb=300MPa, δ=40%, and can maintain high strength under high temperature conditions. It has both steel (high strength) and aluminum (light texture) Advantages, the melting point is (1663 ± 10) ° C, with excellent corrosion resistance and heat res...

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Problems solved by technology

[0004] After searching the literature of the prior art, it was found that S.L.Semiatin, D.P.Delo, etc. once published a paper on "The ECAE Process of Difficult-to-work Alloys" (Equal channel angular extrusion of difficult-to-work alloys) in "Materials and Design" , Materials and Design21 (2000) 311-322), this paper carried out the ECAE process on pure Ti, Ti-6Al-4V and 4340 steel and other hard-to-deform metals, the author of this paper used a mold with a channel angle of 90°, and selected The temperature range of 25°C to 325°C and the strain rate of 0.002 / S to 2 / S were used for the ECAE process on pure titanium. As a result, pure titanium is very sensitive to the shear localization in the ECAE process, and at room temperature (25°C) At the same time, choosing any strain rate between 0.002 / S and 2 / S will make pure titanium become fragments after the ECAE process; and the authors of this document try to treat pure titanium at other temperatures (125 ° C ~ 325 ° C). During the ECAE process, due to the influence of factors such as extrusion temperature, strain rate, and unsuitable lubrication conditions, the pure titanium after equal-diameter angle extrusion will also be fractured to varying degrees, so it is impossible to obtain large blocks of fine-grained materials.