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

An industrial pure titanium and nanocrystalline technology, applied in the direction of metal extrusion dies, etc., can solve the problems of not being able to obtain large blocks of fine-grained materials, pure titanium fractures, etc., and achieve low cost, high strength, and good plasticity. Effect

Inactive Publication Date: 2006-03-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Using industrial pure titanium (TA2) as raw material, anneal the industrial pure titanium block at 700°C, keep it warm for 2 hours, and use an electric spark cutting machine to cut the pure titanium metal block into sections with a size of 10mm×10mm and a length of 120mm. The blank, and the surface treatment of the blank, reaches the surface precision above grade 4, and the surface roughness of the blank should not be lower than Ra=1.25μm. Clean the surface of the blank with acetone, place the blank on a clean stainless steel tray, preheat it at a temperature of 60°C for 60 minutes, and then apply a glass lubricant on the surface of the blank by dip coating. The coating should be uniform. The thickness of the coating is about 0.2mm. After coating, the blank is dried at 60°C for 60 minutes. If there are defects such as falling coating, scratches, and peeling, it should be re-coated or washed off and re-coated. Use acetone to clean the surface and cavity of the mold with ...

Embodiment 2

[0020] Using industrial pure titanium (TA2) as the raw material, anneal the industrial pure titanium block at 750°C and keep it warm for 1 hour. Use an electric spark cutting machine to cut the pure titanium metal block into pieces with a cross-sectional size of 10mm×10mm and a length of 120mm. The blank, and the surface treatment of the blank, reaches the surface precision above grade 4, and the surface roughness of the blank should not be lower than Ra=1.25μm. Clean the surface of the blank with acetone, place the blank on a clean stainless steel tray, preheat it at a temperature of 80°C for 40 minutes, and then apply a glass lubricant on the surface of the blank by dipping. The coating should be uniform. The thickness of the coating is about 0.3mm. After coating, the blank is dried at a temperature of 80°C for 40 minutes. If there are defects such as falling coating, scratches, and peeling, it should be recoated or washed off and recoated. Use acetone to clean the surface a...

Embodiment 3

[0023]Commercially pure titanium (TA2) blocks are used as raw materials, and the commercially pure titanium blocks are annealed at 750° C. and kept for 1.5 hours. Use electric spark cutting machine to cut pure titanium block into blanks with cross-sectional size of 10mm×10mm and length of 120mm, and carry out surface treatment on the blanks to achieve a surface precision above grade 4, and the surface roughness of the blanks should not be lower than Ra = 1.25 μm. Clean the surface of the blank with acetone, place the blank on a clean stainless steel tray, preheat it at a temperature of 100°C for 20 minutes, and then apply a glass lubricant on the surface of the blank by dipping. The coating should be uniform. The thickness of the coating is about 0.4mm. After coating, the blank is dried at 100°C for 20 minutes. If there are defects such as falling coating, scratches, and peeling, it should be re-coated or washed off and re-coated. Use acetone to clean the surface and cavity o...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/01B21C23/32B21C25/02B21C29/00
Inventor 谢超英范志国
Owner SHANGHAI JIAO TONG UNIV
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